LT1460 Datasheet

Linear Technology/Analog Devices

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Datasheet

LT1460
1
1460fc
Description
Features
applications
typical application
OUTPUT VOLTAGE ERROR (%)
–0.10
UNITS (%)
–0.06 –0.02 0
1460 TA02
0.060.02
20
18
16
14
12
10
8
6
4
2
00.10
1400 PARTS
FROM 2 RUNS
Micropower Precision
Series Reference Family
The LT
®
1460 is a micropower bandgap reference that
combines very high accuracy and low drift with low power
dissipation and small package size. This series reference
uses curvature compensation to obtain low temperature
coefficient and trimmed precision thin-film resistors to
achieve high output accuracy. The reference will supply
up to 20mA with excellent line regulation characteristics,
making it ideal for precision regulator applications.
This series reference provides supply current and power
dissipation advantages over shunt references that must idle
the entire load current to operate. Additionally, the LT1460
does not require an output compensation capacitor, yet
is stable with capacitive loads. This feature is important
where PC board space is a premium or fast settling is
demanded. In the event of a reverse battery connection,
these references will not conduct current, and are therefore
protected from damage.
The LT1460 is available in the 8-lead MSOP, SO, PDIP and
the 3-lead TO-92 and SOT23 packages.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
n Handheld Instruments
n Precision Regulators
n A/D and D/A Converters
n Power Supplies
n Hard Disk Drives
n Trimmed to High Accuracy: 0.075% Max
n Low Drift: 10ppm/°C Max
n Industrial Temperature Range
n Temperature Coefficient Guaranteed to 125°C
n Low Supply Current: 130µA Max (LT1460-2.5)
n Minimum Output Current: 20mA
n No Output Capacitor Required
n Reverse Battery Protection
n Minimum Input/Output Differential: 0.9V
n Available in S0-8, MSOP-8, PDIP-8, TO-92 and
SOT- 23 Package
Basic Connection
Typical Distribution of Output Voltage
S8 Package
LT1460-2.5
GND
IN OUT
1460 TA01
C1
0.1µF
2.5V
3.4V
TO 20V
LT1460
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Input Voltage .............................................................30V
Reverse Voltage ......................................................15V
Output Short-Circuit Duration, TA = 25°C
VIN > 10V ............................................................5 sec
VIN ≤ 10V ..................................................... Indefinite
(Note 1)
Specified Temperature Range (Note 10)
Commercial (C) ........................................ 0°C to 70°C
Industrial (I) .........................................40°C to 85°C
High (H) ............................................. 40°C to 125°C
Storage Temperature Range (Note 2) ..... 65°C to 150°C
Lead Temperature (Soldering, 10 sec)...................300°C
absolute MaxiMuM ratings
3 GND
IN 1
TOP VIEW
S3 PACKAGE
3-LEAD PLASTIC SOT-23
OUT 2
TJMAX = 125°C, θJA = 228°C/W
1
2
3
4
8
7
6
5
TOP VIEW
DNC*
VIN
DNC*
GND
DNC*
DNC*
VOUT
DNC*
N8 PACKAGE
8-LEAD PLASTIC DIP
*CONNECTED INTERNALLY.
DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS
TJMAX = 150°C, θJA = 130°C/W
1
2
3
4
8
7
6
5
TOP VIEW
DNC*
DNC*
VOUT
DNC*
DNC*
VIN
DNC*
GND
S8 PACKAGE
8-LEAD PLASTIC SO
*CONNECTED INTERNALLY.
DO NOT CONNECT EXTERNAL CIRCUITRY TO THESE PINS
TJMAX = 150°C, θJA = 190°C/W
1
2
3
4
DNC*
VIN
DNC*
GND
8
7
6
5
DNC*
DNC*
VOUT
DNC*
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
*CONNECTED INTERNALLY.
DO NOT CONNECT EXTERNAL
CIRCUITRY TO THESE PINS
TJMAX = 150°C, θJA = 250°C/W
32
1
BOTTOM VIEW
VIN VOUT GND
Z PACKAGE
3-LEAD TO-92 PLASTIC
TJMAX = 150°C, θJA = 160°C/W
pin conFiguration
LT1460
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orDer inForMation
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT1460ACN8-2.5#PBF LT1460ACN8-2.5#TRPBF 8-Lead Plastic DIP 0°C to 70°C
LT1460BIN8-2.5#PBF LT1460BIN8-2.5#TRPBF 8-Lead Plastic DIP –40°C to 85°C
LT1460DCN8-2.5#PBF LT1460DCN8-2.5#TRPBF 8-Lead Plastic DIP 0°C to 70°C
LT1460EIN8-2.5#PBF LT1460EIN8-2.5#TRPBF 8-Lead Plastic DIP –40°C to 85°C
LT1460ACN8-5#PBF LT1460ACN8-5#TRPBF 8-Lead Plastic DIP 0°C to 70°C
LT1460BIN8-5#PBF LT1460BIN8-5#TRPBF 8-Lead Plastic DIP –40°C to 85°C
LT1460DCN8-5#PBF LT1460DCN8-5#TRPBF 8-Lead Plastic DIP 0°C to 70°C
LT1460EIN8-5#PBF LT1460EIN8-5#TRPBF 8-Lead Plastic DIP –40°C to 85°C
LT1460ACN8-10#PBF LT1460ACN8-10#TRPBF 8-Lead Plastic DIP 0°C to 70°C
LT1460BIN8-10#PBF LT1460BIN8-10#TRPBF 8-Lead Plastic DIP –40°C to 85°C
LT1460DCN8-10#PBF LT1460DCN8-10#TRPBF 8-Lead Plastic DIP 0°C to 70°C
LT1460EIN8-10#PBF LT1460EIN8-10#TRPBF 8-Lead Plastic DIP –40°C to 85°C
LT1460ACS8-2.5#PBF LT1460ACS8-2.5#TRPBF 1460A2 8-Lead Plastic SO 0°C to 70°C
LT1460BIS8-2.5#PBF LT1460BIS8-2.5#TRPBF 460BI2 8-Lead Plastic SO –40°C to 85°C
LT1460DCS8-2.5#PBF LT1460DCS8-2.5#TRPBF 1460D2 8-Lead Plastic SO 0°C to 70°C
LT1460EIS8-2.5#PBF LT1460EIS8-2.5#TRPBF 460EI2 8-Lead Plastic SO –40°C to 85°C
LT1460LHS8-2.5#PBF LT1460LHS8-2.5#TRPBF 60LH25 8-Lead Plastic SO 0°C to 70°C
LT1460MHS8-2.5#PBF LT1460MHS8-2.5#TRPBF 60MH25 8-Lead Plastic SO –40°C to 85°C
LT1460ACS8-5#PBF LT1460ACS8-5#TRPBF 1460A5 8-Lead Plastic SO 0°C to 70°C
LT1460BIS8-5#PBF LT1460BIS8-5#TRPBF 460BI5 8-Lead Plastic SO –40°C to 85°C
Lead Free Finish
TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT1460HCS3-2.5#TRMPBF LT1460HCS3-2.5#TRMPBF LTAC or LTH83-Lead Plastic SOT-23 0°C to 70°C
LT1460JCS3-2.5#TRMPBF LT1460JCS3-2.5#TRPBF LTAD or LTH83-Lead Plastic SOT-23 0°C to 70°C
LT1460KCS3-2.5#TRMPBF LT1460KCS3-2.5#TRPBF LTAE or LTH83-Lead Plastic SOT-23 0°C to 70°C
LT1460HCS3-3#TRMPBF LT1460HCS3-3#TRPBF LTAN or LTH93-Lead Plastic SOT-23 0°C to 70°C
LT1460JCS3-3#TRMPBF LT1460JCS3-3#TRPBF LTAP or LTH93-Lead Plastic SOT-23 0°C to 70°C
LT1460KCS3-3#TRMPBF LT1460KCS3-3#TRPBF LTAQ or LTH93-Lead Plastic SOT-23 0°C to 70°C
LT1460HCS3-3.3#TRMPBF LT1460HCS3-3.3#TRPBF LTAR or LTJ13-Lead Plastic SOT-23 0°C to 70°C
LT1460JCS3-3.3#TRMPBF LT1460JCS3-3.3#TRPBF LTAS or LTJ13-Lead Plastic SOT-23 0°C to 70°C
LT1460KCS3-3.3#TRMPBF LT1460KCS3-3.3#TRPBF LTAT or LTJ13-Lead Plastic SOT-23 0°C to 70°C
LT1460HCS3-5#TRMPBF LT1460HCS3-5#TRPBF LTAK or LTJ23-Lead Plastic SOT-23 0°C to 70°C
LT1460JCS3-5#TRMPBF LT1460JCS3-5#TRPBF LTAL or LTJ23-Lead Plastic SOT-23 0°C to 70°C
LT1460KCS3-5#TRMPBF LT1460KCS3-5#TRPBF LTAM or LTJ23-Lead Plastic SOT-23 0°C to 70°C
LT1460HCS3-10#TRMPBF LT1460HCS3-10#TRPBF LTAU or LTJ33-Lead Plastic SOT-23 0°C to 70°C
LT1460JCS3-10#TRMPBF LT1460JCS3-10#TRPBF LTAV or LTJ33-Lead Plastic SOT-23 0°C to 70°C
LT1460KCS3-10#TRMPBF LT1460KCS3-10#TRPBF LTAW or LTJ33-Lead Plastic SOT-23 0°C to 70°C
TRM = 500 pieces. *Temperature grades and parametric grades are identified by a label on the shipping container.
Product grades are identified with either part marking.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
LT1460
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TEMPERATURE
ACCURACY
(%)
TEMPERATURE
COEFFICIENT
(ppm/°C)
PACKAGE TYPE
N8 S8 MS8 Z S3
0°C to 70°C 0.075 10 LT1460ACN8 LT1460ACS8
–40°C to 85°C 0.10 10 LT1460BIN8 LT1460BIS8
0°C to 70°C 0.10 15 LT1460CCMS8
0°C to 70°C 0.10 20 LT1460DCN8 LT1460DCS8
–40°C to 85°C 0.125 20 LT1460EIN8 LT1460EIS8
0°C to 70°C 0.15 25 LT1460FCMS8
0°C to 70°C 0.25 25 LT1460GCZ
–40°C to 85°C 0.25 25 LT1460GIZ
–40°C to 85°C/125°C 0.20 20/50 LT1460LHS8
–40°C to 125°C 0.20 50 LT1460MHS8
0°C to 70°C 0.20 20 LT1460HCS3
0°C to 70°C 0.40 20 LT1460JCS3
0°C to 70°C 0.50 50 LT1460KCS3
available options
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT1460DCS8-5#PBF LT1460DCS8-5#TRPBF 1460D5 8-Lead Plastic SO 0°C to 70°C
LT1460EIS8-5#PBF LT1460EIS8-5#TRPBF 460EI5 8-Lead Plastic SO –40°C to 85°C
LT1460LHS8-5#PBF LT1460LHS8-5#TRPBF 460LH5 8-Lead Plastic SO 0°C to 70°C
LT1460MHS8-5#PBF LT1460MHS8-5#TRPBF 460MH5 8-Lead Plastic SO –40°C to 85°C
LT1460ACS8-10#PBF LT1460ACS8-10#TRPBF 1460A1 8-Lead Plastic SO 0°C to 70°C
LT1460BIS8-10#PBF LT1460BIS8-10#TRPBF 460BI1 8-Lead Plastic SO –40°C to 85°C
LT1460DCS8-10#PBF LT1460DCS8-10#TRPBF 1460D1 8-Lead Plastic SO 0°C to 70°C
LT1460EIS8-10#PBF LT1460EIS8-10#TRPBF 460EI1 8-Lead Plastic SO –40°C to 85°C
LT1460CCMS8-2.5#PBF LT1460CCMS8-2.5#TRPBF LTAA 8-Lead Plastic MSOP 0°C to 70°C
LT1460FCMS8-2.5#PBF LT1460FCMS8-2.5#TRPBF LTAB 8-Lead Plastic MSOP 0°C to 70°C
LT1460CCMS8-5#PBF LT1460CCMS8-5#TRPBF LTAF 8-Lead Plastic MSOP 0°C to 70°C
LT1460FCMS8-5#PBF LT1460FCMS8-5#TRPBF LTAG 8-Lead Plastic MSOP 0°C to 70°C
LT1460CCMS8-10#PBF LT1460CCMS8-10#TRPBF LTAH 8-Lead Plastic MSOP 0°C to 70°C
LT1460FCMS8-10#PBF LT1460FCMS8-10#TRPBF LTAJ 8-Lead Plastic MSOP 0°C to 70°C
LT1460GCZ-2.5#PBF LT1460GCZ-2.5#TRPBF 3-Lead Plastic TO-92 0°C to 70°C
LT1460GIZ-2.5#PBF LT1460GIZ-2.5#TRPBF 3-Lead Plastic TO-92 –40°C to 85°C
LT1460GCZ-5#PBF LT1460GCZ-5#TRPBF 3-Lead Plastic TO-92 0°C to 70°C
LT1460GIZ-5#PBF LT1460GIZ-5#TRPBF 3-Lead Plastic TO-92 –40°C to 85°C
LT1460GCZ-10#PBF LT1460GCZ-10#TRPBF 3-Lead Plastic TO-92 0°C to 70°C
LT1460GIZ-10#PBF LT1460GIZ-10#TRPBF 3-Lead Plastic TO-92 –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
orDer inForMation
LT1460
5
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PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage LT1460ACN8-2.5, ACS8-2.5 2.49813
–0.075
2.50188
0.075
V
%
LT1460BIN8-2.5, BIS8-2.5, CCMS8-2.5,
DCN8-2.5, DCS8-2.5
2.4975
–0.10
2.5025
0.10
V
%
LT1460EIN8-2.5, EIS8-2.5 2.49688
–0.125
2.50313
0.125
V
%
LT1460FCMS8-2.5 2.49625
–0.15
2.50375
0.15
V
%
LT1460GCZ-2.5, GIZ-2.5 2.49375
–0.25
2.50625
0.25
V
%
LT1460LHS8-2.5, MHS8-2.5 2.495
–0.20
2.505
0.20
V
%
LT1460ACN8-5, ACS8-5 4.99625
–0.075
5.00375
0.075
V
%
LT1460BIN8-5, BIS8-5, CCMS8-5,
DCN8-5, DCS8-5
4.995
–0.10
5.005
0.10
V
%
LT1460EIN8-5, EIS8-5 4.99375
–0.125
5.00625
0.125
V
%
LT1460FCMS8-5 4.9925
–0.15
5.0075
0.15
V
%
LT1460GCZ-5, GIZ-5 4.9875
–0.25
5.0125
0.25
V
%
LT1460LHS8-5, MHS8-5 4.990
–0.20
5.010
0.20
V
%
LT1460ACN8-10, ACS8-10 9.9925
–0.075
10.0075
0.075
V
%
LT1460BIN8-10, BIS8-10, CCMS8-10,
DCN8-10, DCS8-10
9.990
–0.10
10.010
0.10
V
%
LT1460EIN8-10, EIS8-10 9.9875
–0.125
10.0125
0.125
V
%
LT1460FCMS8-10 9.985
–0.15
10.0015
0.15
V
%
LT1460GCZ-10, GIZ-10 9.975
–0.25
10.025
0.25
V
%
LT1460HC
LT1460JC
LT1460KC
–0.2
–0.4
–0.5
0.2
0.4
0.5
%
%
%
Output Voltage Temperature Coefficient (Note 3) TMIN ≤ TJ ≤ TMAX
LT1460ACN8, ACS8, BIN8, BIS8
LT1460CCMS8
LT1460DCN8, DCS8, EIN8, EIS8
LT1460FCMS8, GCZ, GIZ
LT1460LHS8 –40°C to 85°C
–40°C to 125°C
LT1460MHS8 –40°C to 125°C
l
l
l
l
l
l
l
5
7
10
12
10
25
25
10
15
20
25
20
50
50
ppm/°C
ppm/°C
ppm/°C
ppm/°C
ppm/°C
ppm/°C
ppm/°C
LT1460HC
LT1460JC
LT1460KC
l
l
l
10
10
25
20
20
50
ppm/°C
ppm/°C
ppm/°C
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = VOUT + 2.5V, IOUT = 0 unless otherwise specified.
electrical characteristics
LT1460
6
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The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = VOUT + 2.5V, IOUT = 0 unless otherwise specified.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Line Regulation
LT1460A, LT1460B, LT1460C, LT1460D, LT1460E,
LT1460F, LT1460G, LT1460H, LT1460L, LT1460M
VOUT + 0.9V ≤ VIN ≤ VOUT + 2.5V
l
30 60
80
ppm/V
ppm/V
VOUT + 2.5V ≤ VIN ≤ 20V
l
10 25
35
ppm/V
ppm/V
LT1460HC, LT1460JC, LT1460KC VOUT + 0.9V ≤ VIN ≤ VOUT + 2.5V
l
150 800
1000
ppm/V
ppm/V
VOUT + 2.5V ≤ VIN ≤ 20V
l
50 100
130
ppm/V
ppm/V
Load Regulation Sourcing (Note 4)
LT1460A, LT1460B, LT1460C, LT1460D, LT1460E,
LT1460F, LT1460G, LT1460H, LT1460L, LT1460M
IOUT = 100µA
l
1500 2800
3500
ppm/mA
ppm/mA
IOUT = 10mA
l
80 135
180
ppm/mA
ppm/mA
IOUT = 20mA
0°C to 70°C
l
70 100
140
ppm/mA
ppm/mA
LT1460HC, LT1460JC, LT1460KC IOUT = 100µA
l
1000 3000
4000
ppm/mA
ppm/mA
IOUT = 10mA
l
50 200
300
ppm/mA
ppm/mA
IOUT = 20mA
l
20 70
100
ppm/mA
ppm/mA
Thermal Regulation (Note 5)
LT1460A, LT1460B, LT1460C, LT1460D, LT1460E,
LT1460F, LT1460G, LT1460H, LT1460L, LT1460M
ΔP = 200mW 0.5 2.5 ppm/mW
LT1460HC, LT1460JC, LT1460KC ΔP = 200mW 2.5 10 ppm/mW
Dropout Voltage (Note 6) VIN – VOUT
, IOUT = 0 l0.9 V
VIN – VOUT
, IOUT = 10mA
l
1.3
1.4
V
V
Output Current Short VOUT to GND 40 mA
Reverse Leakage VIN = –15V l0.5 10 µA
Supply Current LT1460-2.5
l
100 130
165
µA
µA
LT1460-5
l
125 175
225
µA
µA
LT1460-10
l
190 270
360
µA
µA
LT1460S3-2.5
l
115 145
175
µA
µA
LT1460S3-3
l
145 180
220
µA
µA
LT1460S3-3.3
l
145 180
220
µA
µA
LT1460S3-5
l
160 200
240
µA
µA
LT1460S3-10
l
215 270
350
µA
µA
electrical characteristics
LT1460
7
1460fc
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage Noise (Note 7)
LT1460A, LT1460B, LT1460C, LT1460D, LT1460E,
LT1460F, LT1460G, LT1460H, LT1460L, LT1460M
LT1460-2.5 0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
10
10
µVP-P
µVRMS
LT1460-5 0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
20
20
µVP-P
µVRMS
LT1460-10 0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
40
35
µVP-P
µVRMS
LT1460HC, LT1460JC, LT1460KC 0.1Hz ≤ f ≤ 10Hz
10Hz ≤ f ≤ 1kHz
4
4
ppm (P-P)
ppm (RMS)
Long-Term Stability of Output Voltage (Note 8)
S8 Pkg
40 ppm/√kHr
LT1460HC, LT1460JC, LT1460KC 100 ppm/√kHr
Hysteresis (Note 9)
LT1460A, LT1460B, LT1460C, LT1460D, LT1460E,
LT1460F, LT1460G, LT1460H, LT1460L, LT1460M
ΔT = 0°C to 70°C
ΔT = –40°C to 85°C
25
160
ppm
ppm
LT1460HC, LT1460JC, LT1460KC ΔT = 0°C to 70°C
ΔT = –40°C to 85°C
l
l
50
250
ppm
ppm
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: If the part is stored outside of the specified temperature range, the
output may shift due to hysteresis.
Note 3: Temperature coefficient is measured by dividing the change in
output voltage by the specified temperature range. Incremental slope is
also measured at 25°C.
Note 4: Load regulation is measured on a pulse basis from no load to the
specified load current. Output changes due to die temperature change
must be taken into account separately.
Note 5: Thermal regulation is caused by die temperature gradients created
by load current or input voltage changes. This effect must be added to
normal line or load regulation. This parameter is not 100% tested.
Note 6: Excludes load regulation errors. For LT1460S3, ΔVOUT ≤ 0.2%. For
all other packages, ΔVOUT ≤ 0.1%.
Note 7: Peak-to-peak noise is measured with a single highpass filter at
0.1Hz and 2-pole lowpass filter at 10Hz. The unit is enclosed in a still-air
environment to eliminate thermocouple effects on the leads. The test time
is 10 sec. RMS noise is measured with a single highpass filter at 10Hz and
a 2-pole lowpass filter at 1kHz. The resulting output is full wave rectified
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = VOUT + 2.5V, IOUT = 0 unless otherwise specified.
and then integrated for a fixed period, making the final reading an average
as opposed to RMS. A correction factor of 1.1 is used to convert from
average to RMS and a second correction of 0.88 is used to correct for the
nonideal pass band of the filters.
Note 8: Long-term stability typically has a logarithmic characteristic and
therefore, changes after 1000 hours tend to be much smaller than before
that time. Total drift in the second thousand hours is normally less than
one third that of the first thousand hours with a continuing trend toward
reduced drift with time. Significant improvement in long-term drift can
be realized by preconditioning the IC with a 100 hour to 200 hour, 125°C
burn-in. Long-term stability will also be affected by differential stresses
between the IC and the board material created during board assembly. See
PC Board Layout in the Applications Information section.
Note 9: Hysteresis in output voltage is created by package stress that
differs depending on whether the IC was previously at a higher or lower
temperature. Output voltage is always measured at 25°C, but the IC is
cycled to 85°C or –40°C before successive measurements. Hysteresis
is roughly proportional to the square of the temperature change. For
instruments that are stored at reasonably well-controlled temperatures
(within 20 or 30 degrees of operating temperature) hysteresis is generally
not a problem.
Note 10: The LT1460S3 is guaranteed functional over the operating
temperature range of –40° to 85°C.
electrical characteristics
LT1460
8
1460fc
IOUT = 10mA
LOAD CAPACITANCE (µF)
10
1
0.1
0
1460 G09
INPUT VOLTAGE (V)
0
175
150
125
100
75
50
25
015
1460 G05
5 10 20
SUPPLY CURRENT (µA)
125°C
25°C
–55°C
TEMPERATURE (°C)
–50
OUTPUT VOLTAGE (V)
2.503
2.502
2.501
2.500
2.499
2.498 –25 0 25 50
1460 G04
75 100
3 TYPICAL PARTS
OUTPUT CURRENT (mA)
0 0.5
OUTPUT VOLTAGE CHANGE (mV)
1.0 1.5
1460 G03
80
70
60
50
40
30
20
10
0
–55°C
125°C
25°C
OUTPUT CURRENT (mA)
0.1
OUTPUT VOLTAGE CHANGE (mV)
6
5
4
3
2
1
01 10 100
1460 G02
125°C
25°C
–55°C
INPUT-OUTPUT VOLTAGE (V)
0
OUTPUT CURRENT (mA)
100
10
1
0.1 1.00.5 1.5 2.0 2.5
1460 G01
125°C
–55°C
25°C
INPUT VOLTAGE (V)
0
OUTPUT VOLTAGE (V)
4810 20
1460 G06
2 6 12 14 16 18
2.5014
2.5010
2.5006
2.5002
2.4998
2.4994
2.4990
125°C
25°C
–55°C
FREQUENCY (Hz)
POWER SUPPLY REJECTION RATIO (dB)
90
80
70
60
50
40
30
20
10
0
–10
100 10k 100k 1M
1460 G07
1k
FREQUENCY (Hz)
10
OUTPUT IMPEDANCE (Ω)
1k
100
10
11k100 10k 100k 1M
1460 G08
CL = 0
CL= 0.1µF
CL= 1µF
2.5V Minimum Input-Output
Voltage Differential
2.5V Load Regulation, Sourcing
2.5V Load Regulation, Sinking
2.5V Output Voltage
Temperature Drift
2.5V Supply Current vs Input
Voltage
2.5V Line Regulation
2.5V Power Supply Rejection
Ratio vs Frequency
2.5V Output Impedance vs
Frequency
2.5V Transient Responses
LT1460-2.5 (N8, S8, MS8, Z Packages)
typical perForMance characteristics
LT1460
9
1460fc
TEMPERATURE (°C)
–50
OUTPUT VOLTAGE (V)
5.004
5.002
5.000
4.998
4.996
4.994 –25 0 25 50
1460 G16
75 100
3 TYPICAL PARTS
INPUT VOLTAGE (V)
0
200
180
160
140
120
100
80
60
40
20
0
1460 G17
1642 6 108 12 14 18 20
SUPPLY CURRENT (µA)
125°C
–55°C
25°C
INPUT VOLTAGE (V)
0
OUTPUT VOLTAGE (V)
4810 20
1460 G18
2 6 12 14 16 18
5.002
5.000
4.998
4.996
4.994
4.992
125°C
25°C
–55°C
INPUT-OUTPUT VOLTAGE (V)
0
OUTPUT CURRENT (mA)
100
10
1
0.1 1.00.5 1.5 2.0 2.5
1460 G13
125°C
–55°C
25°C
OUTPUT CURRENT (mA)
0.1
OUTPUT VOLTAGE CHANGE (mV)
6
5
4
3
2
1
01 10 100
1460 G14
125°C 25°C
–55°C
FREQUENCY (Hz)
100
1000
10 1k 10k
1460 G10
100 100k
NOISE VOLTAGE (nV/√Hz)
TIME (SEC)
0 1 2 3 4 5 6 7 8 9 10
OUTPUT NOISE (10µV/DIV)
1460 G11
TIME (HOURS)
0
OUTPUT VOLTAGE (V)
2.5000
2.4998
2.4996
2.4994
2.4992
2.4990 800
1460 G12
200 400 600 1000
2.5V Output Voltage Noise
Spectrum
2.5V Output Noise 0.1Hz to 10Hz
2.5V Long-Term Drift
Three Typical Parts (S8 Package)
5V Minimum Input-Output Voltage
Differential
5V Load Regulation, Sourcing
5V Load Regulation, Sinking
5V Output Voltage
Temperature Drift
5V Supply Current vs Input
Voltage
5V Line Regulation
OUTPUT CURRENT (mA)
0 1 2
OUTPUT VOLTAGE CHANGE (mV)
3 4 5
1460 G15
100
90
80
70
60
50
40
30
20
10
0
25°C
–55°C
125°C
LT1460-5 (N8, S8, MS8, Z Packages)
typical perForMance characteristics
LT1460
10
1460fc
OUTPUT CURRENT (mA)
0.1
4
OUTPUT VOLTAGE CHANGE (mV)
5
6
7
8
1 10 100
1460 G25
3
2
1
0
9
10
55°C
25°C125°C
INPUT/OUTPUT VOLTAGE (V)
0
0.1
OUTPUT CURRENT (mA)
100
0.5 1.0 1.5 2.0 2.5
1460 G24
10
1–55°C
125°C
25°C
OUTPUT CURRENT (mA)
0
OUTPUT VOLTAGE CHANGE (mV)
60
80
100
4
1460 G26
40
20
50
70
90
30
10
01235
–55°C 125°C
25°C
FREQUENCY (Hz)
POWER SUPPLY REJECTION RATIO (dB)
90
80
70
60
50
40
30
20
10
0
100 10k 100k 1M
1460 G19
1k
FREQUENCY (Hz)
10
OUTPUT IMPEDANCE (Ω)
1k
100
10
1
0.1 1k100 10k 100k 1M
1460 G20
CL = 0
CL= 0.1µF
CL= 1µF
IOUT = 10mA 0.2ms/DIV
LOAD CAPACITANCE (µF)
10
1
0.1
0
1460 G21
FREQUENCY (Hz)
100
1000
2000
3000
10 1k 10k
1460 G22
100 100k
NOISE VOLTAGE (nV/√Hz)
TIME (SEC)
0 1 2 3 4 5 6 7 8 9 10
OUTPUT NOISE (10µV/DIV)
1460 G23
5V Power Supply Rejection Ratio
vs Frequency
5V Output Impedance vs
Frequency
5V Transient Responses
5V Output Voltage Noise
Spectrum
5V Output Noise 0.1Hz to 10Hz
10V Minimum Input/Output
Voltage Differential
10V Load Regulation, Sourcing
10V Load Regulation, Sinking
LT1460-10 (N8, S8, MS8, Z Packages)
LT1460-5 (N8, S8, MS8, Z Packages)
typical perForMance characteristics
LT1460
11
1460fc
FREQUENCY (kHz)
0.01
0.1
1
10
1 100.1 100
1460 G33
NOISE VOLTAGE (µV/√Hz)
TIME (SEC)
0
OUTPUT NOISE (50µV/DIV)
8
1460 G34
24610 12 14
INPUT FREQUENCY (kHz)
20
POWER SUPPLY REJECTION RATIO (dB)
40
60
50
80
100
10
30
70
90
0.1 10 100 1000
1460 G30
01
FREQUENCY (kHz)
1
OUTPUT IMPEDANCE (Ω)
10
100
1000
0.01 1 10 100
0.1 0.1 1000
1460 G31
CL = 0µF
CL = 1µF
CL = 0.1µF
IOUT = 10mA 200µs/DIV
LOAD CAPACITANCE (µF)
10
1
0.1
0
1460 G32
TEMPERATURE (°C)
–50
9.982
OUTPUT VOLTAGE (V)
9.986
9.990
9.994
9.998
10.006
–25 0 25 50
1460 G27
75 100
10.002
3 TYPICAL PARTS
INPUT VOLTAGE (V)
0
SUPPLY CURRENT (µA)
240
320
400
16
1460 G28
160
80
200
280
360
120
40
04812
2 18
610 14 20
–55°C
125°C
25°C
INPUT VOLTAGE (V)
6
9.980
OUTPUT VOLTAGE (V)
9.984
9.988
9.992
9.996
10.004
10 14 18
1460 G29
812 16 20
10.000
–55°C
125°C
25°C
10V Output Voltage
Temperature Drift
10V Supply Current vs Input
Voltage
10V Line Regulation
10V Power Supply Rejection
Ratio vs Frequency
10V Output Impedance vs
Frequency
10V Transient Responses
10V Output Voltage Noise
Spectrum
10V Output Noise 0.1Hz to 10Hz
typical perForMance characteristics
LT1460
12
1460fc
TEMPERATURE (°C)
–50
OUTPUT VOLTAGE (V)
2.501
2.502
2.503
25 75
1460 G38
2.500
2.499
–25 0 50 100 125
2.498
2.497
THREE TYPICAL PARTS
INPUT VOLTAGE (V)
0
SUPPLY CURRENT (µA)
100
150
125°C
25°C
–55°C
20
1460 G39
50
0510 15
250
200
INPUT VOLTAGE (V)
0
OUTPUT VOLTAGE (V)
2.502
2.501
2.500
2.499
2.498
2.497
2.496
2.495
2.494 16
1460 G40
4 8 12 20142 6 10 18
25°C
125°C
–55°C
INPUT-OUTPUT VOLTAGE (V)
0
0.1
OUTPUT CURRENT (mA)
10 125°C
25°C
100
0.5 1.0 1.5 2.0 2.5
1460 G35
1–55°C
OUTPUT CURRENT (mA)
0.1
–2.0
OUTPUT VOLTAGE CHANGE (mV)
–1.0
0
1 10 100
1460 G36
–3.0
–2.5
–1.5
–0.5
–3.5
–4.0
–55°C
25°C
125°C
OUTPUT CURRENT (mA)
0
0
OUTPUT VOLTAGE CHANGE (mV)
20
40
60
80
100
120
1 2 3 4
–55°C
1460 G37
5
125°C
25°C
FREQUENCY (kHz)
20
POWER SUPPLY REJECTION RATIO (dB)
40
50
70
80
0.1 10 100 1000
1460 G41
01
60
30
10
FREQUENCY (kHz)
1
OUTPUT IMPEDANCE (Ω)
10
100
1000
0.01 1 10 100
0.1 0.1 1000
1460 G42
CL = 0µF
CL = 0.1µF
CL = 1µF
CLOAD = 0µF 200µs/DIV
LOAD CURRENT (mA)
10
20
1
0.1
1460 G43
Characteristic curves are similar for all voltage
options of the LT1460S3. Curves from the LT1460S3-2.5 and the LT1460S3-10 represent the extremes of the voltage options.
Characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output.
LT1460S3-2.5V Minimum Input-
Output Voltage Differential
LT1460S3-2.5V Load Regulation,
Sourcing
LT1460S3-2.5V Load Regulation,
Sinking
LT1460S3-2.5V Output Voltage
Temperature Drift
LT1460S3-2.5V Supply Current
vs Input Voltage
LT1460S3-2.5V Line Regulation
LT1460S3-2.5V Power Supply
Rejection Ratio vs Frequency
LT1460S3-2.5V Output Impedance
vs Frequency
LT1460S3-2.5V Transient
Response
typical perForMance characteristics
LT1460
13
1460fc
OUTPUT CURRENT (mA)
0.1
15
OUTPUT VOLTAGE CHANGE (mV)
20
25
30
35
1 10 100
1460 G47
10
5
–5
–10
0
125°C 25°C
–55°C
OUTPUT CURRENT (mA)
0
OUTPUT VOLTAGE CHANGE (mV)
150
200
250
4
1460 G48
100
50
01235
125°C
–55°C
25°C
TEMPERATURE (°C)
–50
OUTPUT VOLTAGE (V)
10.002
10.004
10.006
050 75
1460 G49
9.998
10.000
9.996
9.994
9.992
9.990
9.988
9.986
9.984
9.982 –25 25 100 125
THREE TYPICAL PARTS
FREQUENCY (Hz)
100
1000
10 1k 10k
1460 G44
100 100k
NOISE VOLTAGE (nV/√Hz)
TIME (2 SEC/DIV)
OUTPUT NOISE (20µV/DIV)
1460 G45
INPUT-OUTPUT VOLTAGE (V)
0
0.1
OUTPUT CURRENT (mA)
10 125°C
25°C
100
0.5 1.0 1.5 2.0 2.5
1460 G46
1–55°C
INPUT VOLTAGE (V)
0
0
SUPPLY CURRENT (µA)
50
150
200
250
350
210 14
1460 G50
100
300
818 20
4612 16
125°C –55°C
25°C
INPUT VOLTAGE (V)
6
OUTPUT VOLTAGE (V)
10.000
10.005
10.010
12 16
1460 G51
9.995
9.990
8 10 14 18 20
9.985
9.980
125°C
–55°C
25°C
Characteristic curves are similar for all voltage
options of the LT1460S3. Curves from the LT1460S3-2.5 and the LT1460S3-10 represent the extremes of the voltage options.
Characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output.
LT1460S3-2.5V Output Voltage
Noise Spectrum
LT1460S3-2.5V Output Noise
0.1Hz to 10Hz
LT1460S3-10V Minimum Input-
Output Voltage Differential
LT1460S3-10V Load Regulation,
Sourcing
LT1460S3-10V Load Regulation,
Sinking
LT1460S3-10V Output Voltage
Temperature Drift
LT1460S3-10V Supply Current
vs Input Voltage
LT1460S3-10V Line Regulation
typical perForMance characteristics
LT1460
14
1460fc
FREQUENCY (kHz)
0.01
0.1
1
10
1 100.1 100
1460 G55
NOISE VOLTAGE (µV/√Hz)
TIME (2 SEC/DIV)
OUTPUT NOISE (20µV/DIV)
1460 G56
FREQUENCY (kHz)
30
POWER SUPPLY REJECTION RATIO (dB)
90
100
20
10
80
50
70
60
40
0.1 10 100 1000
1460 G52
01
FREQUENCY (kHz)
1
OUTPUT IMPEDANCE (Ω)
10
100
1000
0.01 1 10 100
0.1 0.1 1000
1460 G53
CL = 0µF
CL = 0.1µF
CL = 1µF
CLOAD = 0µF 200µs/DIV
LOAD CURRENT (mA)
10
20
1
0.1
1460 G54
Characteristic curves are similar for all voltage
options of the LT1460S3. Curves from the LT1460S3-2.5 and the LT1460S3-10 represent the extremes of the voltage options.
Characteristic curves for other output voltages fall between these curves, and can be estimated based on their voltage output.
LT1460S3-10V Power Supply
Rejection Ratio vs Frequency
LT1460S3-10V Output Impedance
vs Frequency
LT1460S3-10V Transient
Response
LT1460S3-10V Output Voltage
Noise Spectrum
LT1460S3-10V Output Noise
0.1Hz to 10Hz
typical perForMance characteristics
LT1460
15
1460fc
Longer Battery Life
Series references have a large advantage over older shunt
style references. Shunt references require a resistor from
the power supply to operate. This resistor must be chosen
to supply the maximum current that can ever be demanded
by the circuit being regulated. When the circuit being
controlled is not operating at this maximum current, the
shunt reference must always sink this current, resulting
in high dissipation and short battery life.
The LT1460 series reference does not require a current set-
ting resistor and can operate with any supply voltage from
VOUT + 0.9V to 20V. When the circuitry being regulated does
not demand current, the LT1460 reduces its dissipation and
battery life is extended. If the reference is not delivering load
current it dissipates only a few mW, yet the same configura-
tion can deliver 20mA of load current when demanded.
Capacitive Loads
The LT1460 is designed to be stable with capacitive loads.
With no capacitive load, the reference is ideal for fast set-
tling, applications where PC board space is a premium,
or where available capacitance is limited.
The test circuit for the LT1460-2.5 shown in Figure 1 is
used to measure the response time for various load cur-
rents and load capacitors. The 1V step from 2.5V to 1.5V
produces a current step of 1mA or 100µA for RL = 1k or
RL = 10k. Figure 2 shows the response of the reference
with no load capacitance.
The reference settles to 2.5mV (0.1%) in less than 1µs
for a 100µA pulse and to 0.1% in 1.5µs with a 1mA step.
When load capacitance is greater than 0.01µF, the refer-
ence begins to ring due to the pole formed with the output
impedance. Figure 3 shows the response of the reference
to a 1mA and 100µA load current step with a 0.01µF load
capacitor. The ringing can be greatly reduced with a DC
load as small as 200µA. With large output capacitors, ≥1µF,
Figure 5. Effect of RS for CL = 1µF
Figure 1. Response Time Test Circuit
Figure 2. CL = 0
Figure 3. CL = 0.01µF
Figure 4. Isolation Resistor Test Circuit
LT1460-2.5
RL
VOUT
VGEN
1460 F01
CIN
0.1µF
2.5V
1.5V
CL
VIN = 5V
LT1460-2.5
RL
VGEN
1460 F04
CIN
0.1µF
2.5V
1.5V
CL
VIN = 5V
VOUT
RS
1µs/DIV
2.5V
1.5V
RL = 10k
RL = 1k
1460 F02
VGEN
VOUT
VOUT
20µs/DIV
VGEN
VOUT
VOUT
2.5V
1.5V
RL = 10k
RL = 1k
1460 F03
0.1ms/DIV
2.5V
1.5V
RL = 1k
RS = 0
RL = 1k
RS = 2Ω
1460 F05
VGEN
VOUT
VOUT
the ringing can be reduced with a small resistor in series
with the reference output as shown in Figure 4. Figure 5
shows the response of the LT1460-2.5 with a RS = 2Ω and
applications inForMation
LT1460
16
1460fc
LT1460-5
RL
VOUT
VGEN
1460 F06
CIN
0.1µF
5V
4V
CL
VIN = 5V
2µs/DIV
5V
4V
RL = 10k
RL = 1k
1460 F07
VGEN
VOUT
VOUT
10µs/DIV
5V
4V
RL = 10k
RL = 1k
1460 F08
VGEN
VOUT
VOUT
CL = 1µF. RS should not be made arbitrarily large because
it will limit the load regulation.
Figure 6 to Figure 8 illustrate response in the LT1460-5.
The 1V step from 5V to 4V produces a current step of
1mA or 100µA for RL = 1k or RL = 10k. Figure 7 shows the
response of the reference with no load capacitance.
The reference settles to 5mV (0.1%) in less than 2µs for
a 100µA pulse and to 0.1% in 3µs with a 1mA step. When
load capacitance is greater than 0.01µF, the reference begins
to ring due to the pole formed with the output impedance.
Figure 8 shows the response of the reference to a 1mA
Figure 6. Response Time Test Circuit
Figure 8. CL = 0.01µF
Figure 7. CL = 0
and 100µA load current step with a 0.01µF load capacitor.
Figure 9 to Figure 11 illustrate response of the LT1460-10.
The 1V step from 10V to 9V produces a current step of
1mA or 100µA for RL = 1k or RL = 10k. Figure 10 shows
the response of the reference with no load capacitance.
The reference settles to 10mV (0.1%) in 0.4µs for a 100µA
pulse and to 0.1% in 0.8µs with a 1mA step. When load
capacitance is greater than 0.01µF, the reference begins
to ring due to the pole formed with the output impedance.
Figure 11 shows the response of the reference to a 1mA and
100µA load current step with a 0.01µF load capacitor.
Figure 11. CL = 0.01µF
Figure 10. CL = 0
Figure 9. Response Time Test Circuit
LT1460-10
RL
VOUT
VGEN
1460 F09
CIN
0.1µF
10V
9V
CL
VIN = 12.5V
2µs/DIV
10V
9V
RL = 10k
RL = 1k
1460 F10
VGEN
VOUT
VOUT
10µs/DIV
10V
9V
RL = 10k
RL = 1k
1460 F11
VGEN
VOUT
VOUT
applications inForMation
LT1460
17
1460fc
Figure 13. CL = 0µF
Figure 14. CL = 0.1µF
Figure 15. IOUT = 1mA
Figure 12. Response Time Test Circuit
The LT1460S3 family of references are designed to be
stable with a large range of capacitive loads. With no
capacitive load, these references are ideal for fast settling
or applications where PC board space is a premium. The
test circuit shown in Figure 12 is used to measure the
response time and stability of various load currents and
load capacitors. This circuit is set for the 2.5V option. For
other voltage options, the input voltage must be scaled
up and the output voltage generator offset voltage must
be adjusted. The 1V step from 2.5V to 1.5V produces a
current step of 10mA or 1mA for RL = 100Ω or RL = 1k.
Figure 13 shows the response of the reference to these
applications inForMation
LT1460S3-2.5
RL
VOUT
VGEN
1460 F12
CIN
0.1µF
2.5V
1.5V
CL
VIN = 2.5V
1µs/DIV
10mA
1mA
1.5V
2.5V
1460 F13
VGEN
VOUT
VOUT
100µs/DIV
10mA
1mA
1.5V
2.5V
1460 F14
VGEN
VOUT
VOUT
100µs/DIV
4.7µA
1µA
1.5V
2.5V
1460 F15
VGEN
VOUT
VOUT
1mA and 10mA load steps with no load capacitance, and
Figure 14 shows a 1mA and 10mA load step with a 0.1µF
output capacitor. Figure 15 shows the response to a 1mA
load step with CL = 1µF and 4.7µF.
The frequency compensation of the LT1460S3 version is
slightly different than that of the other packages. Additional
care must be taken when choosing load capacitance in an
application circuit.
Table 1 gives the maximum output capacitance for vari-
ous load currents and output voltages of the LT1460S3 to
avoid instability. Load capacitors with low ESR (effective
series resistance) cause more ringing than capacitors
with higher ESR such as polarized aluminum or tantalum
capacitors.
LT1460
18
1460fc
Table 1. Maximum Output Capacitance for LT1460S3
VOLTAGE
OPTION IOUT = 100µA IOUT = 1mA IOUT = 10mA IOUT = 20mA
2.5V >10µF >10µF 2µF 0.68µF
3V >10µF >10µF 2µF 0.68µF
3.3V >10µF >10µF 1µF 0.68µF
5V >10µF >10µF 1µF 0.68µF
10V >10µF 1µF 0.15µF 0.1µF
Long-Term Drift
Long-term drift cannot be extrapolated from accelerated
high temperature testing. This erroneous technique gives
drift numbers that are wildly optimistic. The only way
long-term drift can be determined is to measure it over
the time interval of interest. The LT1460S3 long-term
drift data was taken on over 100 parts that were soldered
into PC boards similar to a “real world” application. The
boards were then placed into a constant temperature oven
with TA = 30°C, their outputs were scanned regularly and
measured with an 8.5 digit DVM. Figure 16 shows typical
long-term drift of the LT1460S3s.
Hysteresis
Hysteresis data shown in Figure 17 and Figure 18 represents
the worst-case data taken on parts from 0°C to 70°C and
from –40°C to 85°C. The device is capable of dissipating
relatively high power, i.e., for the LT1460S3-2.5, PD = 17.5V
• 20mA = 350mW. The thermal resistance of the SOT-23
package is 325°C/W and this dissipation causes a 114°C
internal rise producing a junction temperature of TJ = 25°C
+ 114°C = 139°C. This elevated temperature will cause
the output to shift due to thermal hysteresis. For highest
performance in precision applications, do not let the
LT1460S3’s junction temperature exceed 85°C.
Figure 16. Typical Long-Term Drift
Figure 17. 0°C to 70°C Hysteresis
Figure 18. –40°C to 85°C Hysteresis
HOURS
–150
ppm
–50
50
150
–100
0
100
200 400 600 800
1460 F16
10001000 300 500 700 900
HYSTERESIS (ppm)
–240 –160 –80 0
NUMBER OF UNITS
870°C TO 25°C 0°C TO 25°C
10
12
1460 F17
6
4
80 160
–200 –120 –40 40 120 200
2
0
18
16
14
240
WORST-CASE HYSTERESIS
ON 40 UNITS
HYSTERESIS (ppm)
–600 –400 –200 0
NUMBER OF UNITS
4
85°C TO 25°C –40°C TO 25°C
5
6
1460 F18
3
2
200 400
–500 –300 –100 100 300 500
1
0
9
8
7
600
WORST-CASE HYSTERESIS
ON 34 UNITS
applications inForMation
LT1460
19
1460fc
Input Capacitance
It is recommended that a 0.1µF or larger capacitor be
added to the input pin of the LT1460. This can help with
stability when large load currents are demanded.
Output Accuracy
Like all references, either series or shunt, the error budget of
the LT1460-2.5 is made up of primarily three components:
initial accuracy, temperature coefficient and load regulation.
Line regulation is neglected because it typically contrib-
utes only 30ppm/V, or 75µV for a 1V input change. The
LT1460-2.5 typically shifts less than 0.01% when soldered
into a PCB, so this is also neglected (see PC Board Layout
section). The output errors are calculated as follows for a
100µA load and 0°C to 70°C temperature range:
LT1460AC
Initial accuracy = 0.075%
For IO = 100µA, and using the LT1460-2.5 for calculation,
ΔVppm
mA mA V V
OUT =
( )( )
=
3500 0 1 2 5 875. . µ
which is 0.035%.
For temperature 0°C to 70°C the maximum ΔT = 70°C,
ΔVppm
CC V mV
OUT =°
°
( )( )
=
10 70 2 5 1 75. .
which is 0.07%.
Total worst-case output error is:
0.075% + 0.035% + 0.070% = 0.180%.
Table 1 gives worst-case accuracy for the LT1460AC, CC,
DC, FC, GC from 0°C to 70°C and the LT1460BI, EI, GI
from –40°C to 85°C.
Note that the LT1460-5 and LT1460-10 give identical ac-
curacy as a fraction of their respective output voltages.
PC Board Layout
In 13- to 16-bit systems where initial accuracy and tem-
perature coefficient calibrations have been done, the me-
chanical and thermal stress on a PC board (in a cardcage
for instance) can shift the output voltage and mask the
true temperature coefficient of a reference. In addition,
the mechanical stress of being soldered into a PC board
can cause the output voltage to shift from its ideal value.
Surface mount voltage references (MS8 and S8) are the
most susceptible to PC board stress because of the small
amount of plastic used to hold the lead frame.
A simple way to improve the stress-related shifts is to
mount the reference near the short edge of the PC board,
or in a corner. The board edge acts as a stress boundary,
or a region where the flexure of the board is minimum.
The package should always be mounted so that the leads
absorb the stress and not the package. The package is
generally aligned with the leads parallel to the long side
of the PC board as shown in Figure 20a.
A qualitative technique to evaluate the effect of stress on
voltage references is to solder the part into a PC board and
Table 2. Worst-Case Output Accuracy Over Temperature
IOUT LT1460AC LT1460BI LT1460CC LT1460DC LT1460EI LT1460FC LT1460GC LT1460GI LT1460HC LT1460JC LT1460KC
0 0.145% 0.225% 0.205% 0.240% 0.375% 0.325% 0.425% 0.562% 0.340% 0.540% 0.850%
100µA 0.180% 0.260% 0.240% 0.275% 0.410% 0.360% 0.460% 0.597% 0.380% 0.580% 0.890%
10mA 0.325% 0.405% 0.385% 0.420% 0.555% 0.505% 0.605% 0.742% 0.640% 0.840% 1.15%
20mA 0.425% N/A 0.485% 0.520% N/A 0.605% 0.705% N/A 0.540% 0.740% 1.05%
applications inForMation
LT1460
20
1460fc
1
2
3
41460 F19
LONG DIMENSION
2
1
0
040
3020
FLEXURE NUMBER
10
1460 F20a
–1
OUTPUT DEVIATION (mV)
FLEXURE NUMBER 1460 F20b
LONG DIMENSION
2
1
0
040
302010
–1
OUTPUT DEVIATION (mV)
deform the board a fixed amount as shown in Figure 19.
The flexure #1 represents no displacement, flexure #2 is
concave movement, flexure #3 is relaxation to no displace-
ment and finally, flexure #4 is a convex movement. This
motion is repeated for a number of cycles and the relative
output deviation is noted. The result shown in Figure 20a
is for two LT1460S8-2.5s mounted vertically and Figure
20b is for two LT1460S8-2.5s mounted horizontally. The
parts oriented in Figure 20a impart less stress into the
package because stress is absorbed in the leads. Figures
20a and 20b show the deviation to be between 125µV and
Figure 19. Flexure Numbers
Figure 20b. Two Typical LT1460S8-2.5s, Horizontal
Orientation Without Slots
Figure 20a. Two Typical LT1460S8-2.5s, Vertical
Orientation Without Slots
250µV and implies a 50ppm and 100ppm change respec-
tively. This corresponds to a 13- to 14-bit system and is
not a problem for most 10- to 12-bit systems unless the
system has a calibration. In this case, as with temperature
hysteresis, this low level can be important and even more
careful techniques are required.
The most effective technique to improve PC board stress
is to cut slots in the board around the reference to serve
as a strain relief. These slots can be cut on three sides of
the reference and the leads can exit on the fourth side. This
“tongue” of PC board material can be oriented in the long
direction of the board to further reduce stress transferred
to the reference.
The results of slotting the PC boards of Figures 20a and
20b are shown in Figures 21a and 21b. In this example
the slots can improve the output shift from about 100ppm
to nearly zero.
SLOT
2
1
0
040
3020
FLEXURE NUMBER
10
1460 F21a
–1
OUTPUT DEVIATION (mV)
SLOT
2
1
0
040
3020
FLEXURE NUMBER
10
1460 F21b
–1
OUTPUT DEVIATION (mV)
Figure 21a. Same Two LT1460S8-2.5s in Figure 16a,
but with Slots
Figure 21b. Same Two LT1460S8-2.5s in Figure 16b,
but with Slots
applications inForMation
LT1460
21
1460fc
siMpliFieD scheMatic
VCC
VOUT
GND
1460 SS
1.20 – 1.40
(.047 – .060)
2.10 – 2.64
(.083 – .104)
2.74
1.92
0.96 BSC
RECOMMENDED SOLDER PAD LAYOUT
0.764
0.8 ±0.127
0.37 – 0.51
(.015 – .020)
0.09 – 0.18
(.004 – .007) S3 SOT-23 0502
2.80 – 3.04
(.110 – .120)
0.89 – 1.03
(.035 – .041)
0.89 – 1.12
(.035 – .044)
0.01 – 0.10
(.0004 – .004)
0.45 – 0.60
(.017 – .024)
0.55
(.022)
REF
1.78 – 2.05
(.070 – .081)
MILLIMETERS
(INCHES)
NOTE:
1. CONTROLLING DIMENSION: MILLIMETERS
2. DIMENSIONS ARE IN
3. DRAWING NOT TO SCALE
4. DIMENSIONS ARE INCLUSIVE OF PLATING
5. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
6. MOLD FLASH SHALL NOT EXCEED .254mm
7. PACKAGE JEDEC REFERENCE IS TO-236 VARIATION AB
package Description
S3 Package
3-Lead Plastic SOT-23
(Reference LTC DWG # 05-08-1631)
LT1460
22
1460fc
N8 1002
.065
(1.651)
TYP
.045 – .065
(1.143 – 1.651)
.130 ± .005
(3.302 ± 0.127)
.020
(0.508)
MIN
.018 ± .003
(0.457 ± 0.076)
.120
(3.048)
MIN
1 2 34
8 7 6 5
.255 ± .015*
(6.477 ± 0.381)
.400*
(10.160)
MAX
.008 – .015
(0.203 – 0.381)
.300 – .325
(7.620 – 8.255)
.325 +.035
–.015
+0.889
0.381
8.255
( )
NOTE:
1. DIMENSIONS ARE INCHES
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
.100
(2.54)
BSC
.016 – .050
(0.406 – 1.270)
.010 – .020
(0.254 – 0.508)× 45°
0°– 8° TYP
.008 – .010
(0.203 – 0.254)
SO8 0303
.053 – .069
(1.346 1.752)
.014 – .019
(0.355 – 0.483)
TYP
.004 – .010
(0.101 0.254)
.050
(1.270)
BSC
1234
.150 – .157
(3.810 – 3.988)
NOTE 3
8765
.189 – .197
(4.801 – 5.004)
NOTE 3
.228 – .244
(5.791 – 6.197)
.245
MIN .160 ±.005
RECOMMENDED SOLDER PAD LAYOUT
.045 ±.005
.050 BSC
.030 ±.005
TYP
INCHES
(MILLIMETERS)
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
package Description
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
LT1460
23
1460fc
MSOP (MS8) 0307 REV F
0.53 ± 0.152
(.021 ± .006)
SEATING
PLANE
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.18
(.007)
0.254
(.010)
1.10
(.043)
MAX
0.22 – 0.38
(.009 – .015)
TYP
0.1016 ± 0.0508
(.004 ± .002)
0.86
(.034)
REF
0.65
(.0256)
BSC
0° – 6° TYP
DETAIL “A”
DETAIL “A”
GAUGE PLANE
1 2 34
4.90 ± 0.152
(.193 ± .006)
8765
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
3.00 ± 0.102
(.118 ± .004)
(NOTE 4)
0.52
(.0205)
REF
5.23
(.206)
MIN
3.20 – 3.45
(.126 – .136)
0.889 ± 0.127
(.035 ± .005)
RECOMMENDED SOLDER PAD LAYOUT
0.42 ± 0.038
(.0165 ± .0015)
TYP
0.65
(.0256)
BSC
package Description
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660 Rev F)
LT1460
24
1460fc
.050
(1.27)
BSC
.060 p .005
(1.524p 0.127)
DIA
.90
(2.286)
NOM
.180 p .005
(4.572 p 0.127)
.180 p .005
(4.572 p 0.127)
.500
(12.70)
MIN
.050
(1.270)
MAX
UNCONTROLLED
LEAD DIMENSION
.016 p .003
(0.406 p 0.076)
5o
NOM
BULK PACK
.015 p .002
(0.381 p 0.051)
.060 p .010
(1.524 p 0.254)
10oNOM
.140 p .010
(3.556 p 0.127)
Z3 (TO-92) 1008 REV C
3 2 1
.098 +.016/–.04
(2.5 +0.4/–0.1)
2 PLCS TO-92 TAPE AND REEL
REFER TO TAPE AND REEL SECTION OF
LTC DATA BOOK FOR ADDITIONAL INFORMATION
package Description
Z Package
3-Lead Plastic TO-92 (Similar to TO-226)
(Reference LTC DWG # 05-08-1410 Rev C)
LT1460
25
1460fc
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
revision history
REV DATE DESCRIPTION PAGE NUMBER
C 3/10 Change θJA on S3 Package from 325°C/W to 228°C/W 2
(Revision history begins at Rev C)
LT1460
26
1460fc
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
LINEAR TECHNOLOGY CORPORATION 2006
LT 0310 REV C • PRINTED IN USA
typical applications
Handling Higher Load Currents
Boosted Output Current with No Current Limit Boosted Output Current with Current Limit
PART NUMBER DESCRIPTION COMMENTS
LT1019 Precision Bandgap Reference 0.05% Max, 5ppm/°C Max
LT1027 Precision 5V Reference 0.02%, 2ppm/°C Max
LT1236 Precision Low Noise Reference 0.05% Max, 5ppm/°C Max, SO Package
LT1461 Micropower Precision Low Dropout 0.04% Max, 3ppm/°C Max, 50mA Output Current
LT1634 Micropower Precision Shunt Reference 1.25V, 2.5V Output 0.05%, 25ppm/°C Max
LT1790 Micropower Precision Series References 0.05% Max, 10ppm/°C Max, 60µA Supply, SOT23 Package
LTC
®
1798 Micropower Low Dropout Reference, Fixed or Adjustable 0.15% Max, 40ppm/°C, 6.5µA Max Supply Current
LTC6652 Low Drift Low Noise Buffered Reference 0.05% Accuracy, 5ppm/°C Drift, 2.1ppm (0.1Hz to 10Hz) Noise
LT6660 Tiny Micropower Precision Series References 0.075% Max, 10ppm/°C Max, 20mA Output, 2mm × 2mm DFN Package
1460 TA03
RL
40mA
V+
R1*
VOUT
TYPICAL LOAD
CURRENT = 50mA
SELECT R1 TO DELIVER 80% OF TYPICAL LOAD CURRENT.
LT1460 WILL THEN SOURCE AS NECESSARY TO MAINTAIN
PROPER OUTPUT. DO NOT REMOVE LOAD AS OUTPUT WILL
BE DRIVEN UNREGULATED HIGH. LINE REGULATION IS
DEGRADED IN THIS APPLICATION
*
10mA
47µF
+
LT1460
OUT
GND
IN
R1 = V+ – VOUT
40mA
V+ ≥ (VOUT + 1.8V)
LT1460
OUT
GND
IN
1460 TA04
2N2905
VOUT
100mA
47µF
2µF
SOLID
TANT
R1
220Ω
+
+
1460 TA05
2N2905
VOUT
100mA
2µF
SOLID
TANT
D1*
LED
V+ ≥ VOUT + 2.8V
8.2Ω
R1
220Ω
GLOWS IN CURRENT LIMIT,
DO NOT OMIT
*
47µF
+
+
LT1460
OUT
GND
IN
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