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LD1085xx Datasheet by STMicroelectronics

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This is information on a product in full production.
October 2013 DocID6738 Rev 27 1/27
27
LD1085
3 A low drop positive voltage regulator: adjustable and fixed
Datasheet
-
production data
Features
Typical dropout 1.3 V (at 3 A)
Three terminal adjustable or fixed output
voltage 1.8 V, 2.5 V, 3.3 V, 5 V
Guaranteed output current up to 3 A
Output tolerance ± 1% at 25 °C and ± 2% in full
temperature range
Internal power and thermal limit
Wide operating temperature range -40 °C to
125 °C
Package available: TO-220, TO-220FP,
D²PAK, D²PAK/A
Pinout compatibility with standard adjustable
VREG
Description
The LD1085 is a low drop voltage regulator able
to provide up to 3 A of output current. Dropout is
guaranteed at a maximum of 1.2 V at the
maximum output current, decreasing at lower
loads. The LD1085 is pin-to-pin compatible with
the older 3-terminal adjustable regulators, but
offers better performance in terms of drop and
output tolerance.
Unlike PNP regulators, where a part of the output
current is wasted as quiescent current, the
LD1085 quiescent current flows into the load,
thus increase efficiency. Only a 10 µF minimum
capacitor is need for stability.
The device is supplied in TO-220, TO-220FP,
D²PAK and D²PAK/A packages. On-chip trimming
allows the regulator to reach a very tight output
voltage tolerance, within ± 1% at 25 °C.
TO-220 TO-220FP
D²PAK D²PAK/A
www.st.com
Contents LD1085
2/27 DocID6738 Rev 27
Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8 Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
9 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
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DocID6738 Rev 27 3/27
LD1085 Diagram
1 Diagram
Figure 1. Schematic diagram
\ O 3:4 ‘NPUT 3: OUTPUT j: ADJ/(3ND H mm U :2- \NPUTS TAE=OUTPUT :I OUTPUT :2: ADJ/(3ND rx csmm :: ‘NFUT 3: OUTPUT j: ADJ/(3ND TAE=0UTPUT csnsAJa :ZI INPUTS :.‘=| OUTPUT :IZI ADJ/(3ND
Pin configuration LD1085
4/27 DocID6738 Rev 27
2 Pin configuration
Figure 2. Pin connections (top view)
TO-220FP
D²PAK/A
TO-220
D²PAK
é]
DocID6738 Rev 27 5/27
LD1085 Maximum ratings
3 Maximum ratings
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied
Table 1. Absolute maximum ratings
Symbol Parameter Value Unit
V
I
DC input voltage 30 V
I
O
Output current Internally limited mA
P
D
Power dissipation Internally limited mW
T
STG
Storage temperature range -55 to +150 °C
T
OP
Operating junction temperature range -40 to +125 °C
Table 2. Thermal data
Symbol Parameter TO-220 TO-220FP D²PAK
D²PAK/A Unit
R
thJC
Thermal resistance junction-case 3 5 3 °C/W
R
thJA
Thermal resistance junction-ambient 50 60 62.5 °C/W
\ N LD1085 OUT GND Sm mo LDIDES w OUT ADJ , Esau-7n
Application schematic LD1085
6/27 DocID6738 Rev 27
4 Application schematic
Figure 3. Application circuit
V
O
V
REF
1R
2
R
1
-------+


=
é]
DocID6738 Rev 27 7/27
LD1085 Electrical characteristics
5 Electrical characteristics
V
I
= 4.8 V, C
I
= C
O
=10 µF, T
A
= -40 to 125 °C, unless otherwise specified.
Table 3. Electrical characteristics of LD1085#18
Symbol Parameter Test condition Min. Typ. Max. Unit
V
O
Output voltage
(1)
I
O
= 0 mA, T
J
= 25°C 1.782 1.8 1.818 V
I
O
= 0 to 3 A, V
I
= 3.4 to 30 V 1.764 1.8 1.836 V
ΔV
O
Line regulation I
O
= 0 mA, V
I
= 3.4 to 18 V T
J
= 25°C 0.2 4 mV
I
O
= 0 mA, V
I
= 3.4 to 15 V 0.4 4 mV
ΔV
O
Load regulation I
O
= 0 to 3 A, T
J
= 25°C 2 10 mV
I
O
= 0 to 3 A 4 20 mV
V
d
Dropout voltage I
O
= 3 A 1.3 1.5 V
I
q
Quiescent current V
I
30 V 5 10 mA
I
sc
Short-circuit current V
I
- V
O
= 5 V 3.2 4.5 A
V
I
- V
O
= 25 V 0.2 0.5 A
Thermal regulation T
A
= 25°C, 30 ms pulse 0.008 0.04 %/W
SVR Supply voltage rejection f = 120 Hz, C
O
= 25 µF, I
O
= 3 A
V
I
= 7.5 ± 3 V 60 72 dB
eN RMS output noise voltage (% of
V
O
)T
A
= 25°C, f =10 Hz to 10 kHz 0.003 %
S Temperature stability 0.5 %
S Long term stability T
A
= 125°C, 1000 Hrs 0.5 %
1. See short-circuit current curve for available output current at fixed dropout.
Electrical characteristics LD1085
8/27 DocID6738 Rev 27
V
I
= 5.5 V, C
I
= C
O
=10 µF, T
A
= -40 to 125 °C, unless otherwise specified.
Table 4. Electrical characteristics of LD1085#25
Symbol Parameter Test condition Min. Typ. Max. Unit
V
O
Output voltage
(1)
I
O
= 0 mA, T
J
= 25°C 2.475 2.5 2.525 V
I
O
= 0 to 3 A, V
I
= 4.1 to 30 V 2.45 2.5 2.55 V
ΔV
O
Line regulation I
O
= 0 mA, V
I
= 4.1 to 18 V, T
J
= 25°C 0.2 4 mV
I
O
= 0 mA, V
I
= 4.1 to 18 V 0.4 4 mV
ΔV
O
Load regulation I
O
= 0 to 3 A, T
J
= 25°C 2 10 mV
I
O
= 0 to 3 A 4 20 mV
V
d
Dropout voltage I
O
= 3 A 1.3 1.5 V
I
q
Quiescent current V
I
30 V 5 10 mA
I
sc
Short-circuit current V
I
- V
O
= 5 V 3.2 4.5 A
V
I
- V
O
= 25 V 0.2 0.5 A
Thermal regulation T
A
= 25°C, 30ms pulse 0.008 0.04 %/W
SVR Supply voltage rejection f = 120 Hz, C
O
= 25µF, I
O
= 3 A
V
I
= 7.5 ± 3 V 60 72 dB
eN RMS output noise voltage (%
of V
O
)T
A
= 25°C, f =10 Hz to 10 kHz 0.003 %
S Temperature stability 0.5 %
S Long term stability T
A
= 125°C, 1000 Hrs 0.5 %
1. See short-circuit current curve for available output current at fixed dropout.
é]
DocID6738 Rev 27 9/27
LD1085 Electrical characteristics
V
I
= 6.3 V, C
I
= C
O
=10 µF, T
A
= -40 to 125 °C, unless otherwise specified.
Table 5. Electrical characteristics of LD1085#33
Symbol Parameter Test condition Min. Typ. Max. Unit
V
O
Output voltage
(1)
I
O
= 0 mA, T
J
= 25°C 3.267 3.3 3.333 V
I
O
= 0 to 3 A, V
I
= 4.9 to 30 V 3.234 3.35 3.366 V
ΔV
O
Line regulation I
O
= 0 mA, V
I
= 4.9 to 18 V, T
J
= 25°C 0.5 6 mV
I
O
= 0 mA, V
I
= 4.9 to 18 V 1 6 mV
ΔV
O
Load regulation I
O
= 0 to 3 A, T
J
= 25°C 3 15 mV
I
O
= 0 to 3 A 7 20 mV
V
d
Dropout voltage I
O
= 3 A 1.3 1.5 V
I
q
Quiescent current V
I
30 V 5 10 mA
I
sc
Short-circuit current V
I
- V
O
= 5 V 3.2 4.5 A
V
I
- V
O
= 25 V 0.2 0.5 A
Thermal regulation T
A
= 25°C, 30 ms pulse 0.008 0.04 %/W
SVR Supply voltage rejection f = 120 Hz, C
O
= 25 µF, I
O
= 3 A
V
I
= 8.3 ± 3 V 60 72 dB
eN RMS output noise voltage (%
of V
O
)T
A
= 25°C, f =10 Hz to 10 kHz 0.003 %
S Temperature stability 0.5 %
S Long term stability T
A
= 125°C, 1000 Hrs 0.5 %
1. See short-circuit current curve for available output current at fixed dropout.
Electrical characteristics LD1085
10/27 DocID6738 Rev 27
V
I
= 8 V, C
I
= C
O
=10 µF, T
A
= -40 to 125 °C, unless otherwise specified.
Table 6. Electrical characteristics of LD1085#50
Symbol Parameter Test condition Min. Typ. Max. Unit
V
O
Output voltage
(1)
I
O
= 0 mA, T
J
= 25°C 4.95 5 5.05 V
I
O
= 0 to 3 A, V
I
= 6.6 to 30 V 4.9 5 5.1 V
ΔV
O
Line regulation I
O
= 0 mA, V
I
= 6.6 to 20 V, T
J
= 25°C 0.5 10 mV
I
O
= 0 mA, V
I
= 6.6 to 20 V 1 10 mV
ΔV
O
Load regulation I
O
= 0 to 3 A, T
J
= 25°C 5 10 mV
I
O
= 0 to 3 A 10 35 mV
V
d
Dropout voltage I
O
= 3 A 1.3 1.5 V
I
q
Quiescent current V
I
30 V 5 10 mA
I
sc
Short-circuit current V
I
- V
O
= 5 V 3.2 4.5 A
V
I
- V
O
= 25 V 0.2 0.5 A
Thermal regulation T
A
= 25°C, 30 ms pulse 0.008 0.04 %/W
SVR Supply voltage rejection f = 120 Hz, C
O
= 25 µF, I
O
= 3 A
V
I
= 10 ± 3 V 60 72 dB
eN RMS output noise voltage (%
of V
O
)T
A
= 25°C, f = 10 Hz to 10 kHz 0.003 %
S Temperature stability 0.5 %
S Long term stability T
A
= 125°C, 1000 Hrs 0.5 %
1. See short-circuit current curve for available output current at fixed dropout.
é]
DocID6738 Rev 27 11/27
LD1085 Electrical characteristics
V
I
= 4.25 V, C
I
= C
O
=10 µF, T
A
= -40 to 125 °C, unless otherwise specified.
Table 7. Electrical characteristics of LD1085#
Symbol Parameter Test condition Min. Typ. Max. Unit
V
ref
Reference voltage
(1)
I
O
= 10 mA T
J
= 25°C 1.237 1.25 1.263 V
I
O
= 10 mA to 3 A, V
I
= 2.85 to 30 V 1.225 1.25 1.275 V
ΔV
O
Line regulation
I
O
= 10 mA, V
I
= 2.85 to 16.5 V,
T
J
= 25°C 0.015 0.2 %
I
O
= 10 mA, V
I
= 2.85 to 16.5 V 0.035 0.2 %
ΔV
O
Load regulation I
O
= 10 mA to 3 A, T
J
= 25°C 0.1 0.3 %
I
O
= 0 to 3 A 0.2 0.4 %
V
d
Dropout voltage I
O
= 3 A 1.3 1.5 V
I
O(min)
Minimum load current V
I
= 30 V 3 10 mA
I
sc
Short-circuit current V
I
- V
O
= 5 V 5.5 6.5 A
V
I
- V
O
= 25 V 0.5 0.7 A
Thermal regulation T
A
= 25°C, 30ms pulse 0.003 0.015 %/W
SVR Supply voltage rejection f = 120 Hz, C
O
= 25 µF,C
ADJ
= 25 µF,
I
O
= 3 A, V
I
= 6.25 ± 3 V 60 72 dB
I
ADJ
Adjust pin current V
I
= 4.25 V, I
O
= 10 mA 55 120 µA
ΔI
ADJ
Adjust pin current change
(1)
I
O
= 10 mA to 3 A, V
I
= 2.85 to 16.5 V 0.2 5 µA
eN RMS output noise voltage (%
of V
O
)T
A
= 25°C, f =10 Hz to 10 kHz 0.003 %
S Temperature stability 0.5 %
S Long term stability T
A
= 125°C, 1000 Hrs 0.5 %
1. See short-circuit current curve for available output current at fixed dropout.
lo Va (V) 1 .53 1.52 LE1 1.80 1.75 1.75 1.77 1.76 —50 comma mam Va (V) 12.1 12.0 11.5 —50 0 SD 100 T4 ( "(2) scum vow) 1.25 // \\ 1.24 1.22 1.20 750 o 50 100 m (°c) Guam u be (A) c :mmam.) 5 C:=22/1.F(1unf.) o 5 ID I5 20 25 WW)
Typical characteristics LD1085
12/27 DocID6738 Rev 27
6 Typical characteristics
Unless otherwise specified T
J
= 25 °C, C
I
= C
O
= 10 µF.
Figure 4. Output voltage vs. temp. (I
O
= 3 A) Figure 5. Output voltage vs. temp. (I
O
= 0 mA)
Figure 6. Output voltage vs. temp. (I
O
= 10 mA) Figure 7. Short-circuit current vs. dropout
voltage
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DocID6738 Rev 27 13/27
LD1085 Typical characteristics
Figure 8. Line regulation vs. temp. (I
O
= 10 mA) Figure 9. Load regulation vs. temperature
Figure 10. Dropout voltage vs. temperature Figure 11. Dropout voltage vs. output current
Figure 12. Adjust pin current vs. temperature Figure 13. Quiescent current vs. temperature
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Typical characteristics LD1085
14/27 DocID6738 Rev 27
Figure 14. Line regulation vs. temperature
(V
IN
= 15 V) Figure 15. Supply voltage rejection vs. output
current
Figure 16. Supply voltage rejection vs.
frequency Figure 17. Supply voltage rejection vs.
temperature
Figure 18. Minimum load current vs.
temperature Figure 19. Stability, V
O
= 1.8 V
mam 55mm) 10‘ m“ to" 10’1 10'1 m" In“ 10‘ CoOLF) ADJ vwmw cm '2uu'n m 20mm Mmflustml 1m: Co CADJ m ADJ u:
DocID6738 Rev 27 15/27
LD1085 Typical characteristics
Figure 20. Stability, V
O
= 12 V Figure 21. Line transient
V
I
=12 to 13V, I
O
=200mA, C
I
= 1µF(tant),
C
O
=10µF(tant), C
ADJ
=1µF
Figure 22. Load transient Figure 23. Load transient (No C
ADJ
)
V
I
=12V, I
O
=0.12 to 3A, C
I
= 1µF(tant),
C
O
=10µF(tant), C
ADJ
=1µF
V
I
=12V, I
O
=0.12 to 3A, C
I
= 1µF(tant),
C
O
=10µF(tant), no C
ADJ
Package mechanical data LD1085
16/27 DocID6738 Rev 27
7 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK
®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK
®
is an ST trademark.
Table 8. TO-220 mechanical data
Dim. mm
Min. Typ. Max.
A 4.40 4.60
b 0.61 0.88
b1 1.14 1.70
c 0.48 0.70
D 15.25 15.75
E 10 10.40
e 2.40 2.70
e1 4.95 5.15
F 0.51 0.60
H1 6.20 6.60
J1 2.40 2.72
L13 14
L1 3.50 3.93
L20 16.40
L30 28.90
P 3.75 3.85
Q 2.65 2.95
é] E m P 4 .i < o="" \="" j="" e="" o="" n="" e="" 7="" g="" ‘="" w="" 3="" j1="" gate="" hate="" arm="" b1="" 4="" (x3)="" 5="" n="" (x3)="" 61="">
DocID6738 Rev 27 17/27
LD1085 Package mechanical data
Figure 24. TO-220 drawing
BUHY'
Du L7
Package mechanical data LD1085
18/27 DocID6738 Rev 27
Figure 25. TO-220FP drawing
Table 9. TO-220FP mechanical data
Dim. mm
Min. Typ. Max.
A4.4 4.6
B2.5 2.7
D2.5 2.75
E 0.45 0.7
F0.75 1
F1 1.15 1.70
F2 1.15 1.70
G 4.95 5.2
G1 2.4 2.7
H10 10.4
L2 16
L3 28.6 30.6
L4 9.8 10.6
L5 2.9 3.6
L6 15.9 16.4
L7 9 9.3
Dia 3 3.2
7012510_Rev_K
A
B
H
Dia
L7
D
E
L6 L5
L2
L3
L4
F1 F2
F
G
G1
é]
DocID6738 Rev 27 19/27
LD1085 Package mechanical data
Table 10. D²PAK mechanical data
Dim. mm
Min. Typ. Max.
A4.40 4.60
A1 0.03 0.23
b0.70 0.93
b2 1.14 1.70
c0.45 0.60
c2 1.23 1.36
D8.95 9.35
D1 7.50
E 10 10.40
E1 8.50
e2.54
e1 4.88 5.28
H 15 15.85
J1 2.49 2.69
L2.29 2.79
L1 1.27 1.40
L2 1.30 1.75
R0.4
V2 0°
Package mechanical data LD1085
20/27 DocID6738 Rev 27
Figure 26. D²PAK drawing
0079457_T
é]
DocID6738 Rev 27 21/27
LD1085 Package mechanical data
Table 11. D²PAK/A mechanical data
Dim. mm
Min. Typ. Max.
A4.40 4.60
A1 0.03 0.23
b0.70 0.93
b2 1.14 1.70
c0.45 0.60
c2 1.23 1.36
D8.95 9.35
D1 7.50
E 10 10.40
E1 8.50
e2.54
e1 4.88 5.28
H 15 15.85
J1 2.49 2.69
L2.29 2.79
L1 1.27 1.40
R0.4
V2 0°
TYPE "A " sm—sr / .4» E J/; ”2 L1 = g H‘ ‘ D ~ - - 43$- _ L“ A r J] (mi, __s_- ' b2 (M c .JL. 554 TING PLANE —> CGPLANAR/TY A I 17 17 i w THERMAL FAD GAUGE PLANE
Package mechanical data LD1085
22/27 DocID6738 Rev 27
Figure 27. D²PAK/A mechanical data
7106164_E
é]
DocID6738 Rev 27 23/27
LD1085 Packaging mechanical data
8 Packaging mechanical data
Figure 28. D²PAK, D²PAK/A footprint
(a)
Table 12. D²PAK, D²PAK/A tape and reel mechanical data
Tape Reel
Dim. mm Dim. mm
Min. Max. Min. Max.
A0 10.5 10.7 A 330
B0 15.7 15.9 B 1.5
D 1.5 1.6 C 12.8 13.2
D1 1.59 1.61 D 20.2
E 1.65 1.85 G 24.4 26.4
F 11.4 11.6 N 100
K0 4.8 5.0 T 30.4
P0 3.9 4.1
P1 11.9 12.1 Base qty 1000
P2 1.9 2.1 Bulk qty 1000
R50
T 0.25 0.35
W 23.7 24.3
a. All dimensions are in millimeters
16.90
12.20
9.75
3.50
5.08
1.60
Footprint
Packaging mechanical data LD1085
24/27 DocID6738 Rev 27
Figure 29. Tape for D²PAK and D²PAK/A
Figure 30. Reel for D²PAK and D²PAK/A
P1
A0 D1
P0
F
W
E
D
B0
K0
T
User direction of feed
P2
10 pitches cumulative
tolerance on tape +/- 0.2 mm
User direction of feed
R
Bending radius
B1
For machine ref. only
including draft and
radii concentric around B0
AM08852v1
Top cover
tape
A
D
B
Full radius G measured at hub
C
N
REEL DIMENSIONS
40mm min.
Access hole
At sl ot location
T
Tape slot
in core for
tape start 25 mm min.
width
AM08851v2
é]
DocID6738 Rev 27 25/27
LD1085 Order codes
9 Order codes
Table 13. Order codes
Packages Output
voltage
TO-220 TO-220FP D²PAK D²PAK/A (T&R)
LD1085D2M18R 1.8 V
LD1085D2M25R 2.5 V
LD1085D2T33R LD1085D2M33R 3.3 V
LD1085V50 5.0 V
LD1085V LD1085P LD1085D2T-R LD1085D2M-R ADJ
Revision history LD1085
26/27 DocID6738 Rev 27
10 Revision history
Table 14. Document revision history
Date Revision Changes
07-Oct-2004 12 Mistake order codes - Table 1.
08-Feb-2005 13 Mistake U.M. load regulation - V ==> mV.
01-Mar-2005 14 Version 1.2 V removed.
22-May-2006 15 Order codes has been updated and new template.
10-Nov-2006 16 Add package DPAK, typo on V
O
test value in tables 3, 4 and 11.
04-Apr-2007 17 Order codes updated.
07-Jun-2007 18 Order codes updated.
05-Dec-2007 19 Modified: Table 13.
29-Jan-2008 20 Added new order codes for Automotive grade products see Table 13 on
page 25.
18-Feb-2008 21 Modified: Table 13 on page 25.
09-Apr-2008 22 Modified: Table 13 on page 25.
14-Jul-2008 23 Modified: Table 13 on page 25.
22-Aug-2008 24 Modified: Table 2 on page 5.
28-Jul-2009 25 Modified: Table 13 on page 25.
18-Feb-2013 26
Modified Output voltage in Voltage reference parameter Table 7 on page 11
and Table 8 on page 12.
Minor text changes throughout the document.
08-Oct-2013 27
RPN LD1085xx changed to LD1085.
Updated the Features and the Description in cover page.
Cancelled Table1: Device summary, Table 9: Electrical characteristics of
LD1085PY (Automotive Grade).
Modified Figure 2: Pin connections (top view), Table 2: Thermal data, Table 13:
Order codes, Section 7: Package mechanical data.
Added Section 8: Packaging mechanical data.
Minor text changes.
W m
DocID6738 Rev 27 27/27
LD1085
Please Read Carefully:
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