MAX17220-25 Datasheet

Maxim Integrated

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Datasheet

General Description
The MAX17220–MAX17225 is a family of ultra-low
quiescent current boost (step-up) DC-DC converters
with a 225mA/0.5A/1A peak inductor current limit and
True Shutdown™. True Shutdown disconnects the output
from the input with no forward or reverse current. The
output voltage is selectable using a single standard 1%
resistor. The 225mA (MAX17220), 500mA (MAX17222/
MAX17223), and 1A (MAX17224/MAX17225) peak inductor
current limits allow flexibility when choosing inductors. The
MAX17220/MAX17222/MAX17224 versions have post-
startup enable transient protection (ETP), allowing the
output to remain regulated for input voltages down to
400mV, depending on load current. The MAX17220–
MAX17225 offer ultra-low quiescent current, small total
solution size, and high efficiency throughout the entire load
range. The MAX17220–MAX17225 are ideal for battery
applications where long battery life is a must.
Applications
Optical Heart-Rate Monitoring (OHRM) LED Drivers
Supercapacitor Backup for RTC/Alarm Buzzers
Primary-Cell Portable Systems
Tiny, Low-Power IoT Sensors
Secondary-Cell Portable Systems
Wearable Devices
Battery-Powered Medical Equipment
Low-Power Wireless Communication Products
Ordering Information appears at end of data sheet.
19-8753; Rev 3; 7/17
Benefits and Features
300nA Quiescent Supply Current Into OUT
True Shutdown Mode
0.5nA Shutdown Current
Output Disconnects from Input
No Reverse Current with VOUT 0V to 5V
95% Peak Efficiency
400mV to 5.5V Input Range
0.88V Minimum Startup Voltage
1.8V to 5V Output Voltage Range
100mV/Step
Single 1% Resistor Selectable Output
225mA, 500mA, and 1A Peak Inductor Current Limit
MAX17220: 225mA ILIM
MAX17222/MAX17223: 500mA ILIM
MAX17224/MAX17225: 1A ILIM
MAX17220/MAX17222/MAX17224 Enable Transient
Protection (ETP)
2mm x 2mm 6-Pin μDFN
0.88mm x 1.4mm 6-Bump WLP (2 x 3, 0.4mm Pitch)
True Shutdown is a trademark of Maxim Integrated Products, Inc.
Typical Operating Circuit
CIN
10µF
IN
SEL
GND
LX
IN
400mV TO 5.5V
GND
OUT
MAX1722X
OUT
EN
EN
COUT
10µF
2.2µH
RSEL
STARTUP
0.88 (TYP)
L1
MAX17220‒MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
EVALUATION KIT AVAILABLE
OUT, EN, IN to GND ...............................................-0.3V to +6V
RSEL to GND ................ -0.3V to Lower of (VOUT + 0.3V) or 6V
LX RMS Current WLP ............................-1.6ARMS to +1.6ARMS
LX RMS Current µDFN ................................-1ARMS to +1ARMS
Continuous Power Dissipation (TA = 70°C)
WLP (derate 10.5mW/°C above +70°C) ......................840mW
Continuous Power Dissipation (TA = 70°C)
µDFN (derate 4.5mW/°C above +70°C) ...................357.8mW
Operating Temperature Range ........................... -40°C to +85°C
Junction Temperature ...................................................... +150°C
Storage Temperature Range ............................ -40°C to +150°C
Soldering Temperature (reflow) ....................................... +260°C
Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
µDFN
PACKAGE CODE L622+1C
Outline Number 21-0164
Land Pattern Number 90-0004
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θJA) 223.6°C/W
Junction to Case (θJC) 122°C/W
WLP
PACKAGE CODE N60E1+1
Outline Number 21-100128
Land Pattern Number Refer to Application Note 1891
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θJA) 95.15°C/W
Junction to Case (θJC) N/A
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.
For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Package Information
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2
MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
(VIN = VEN = 1.5V, VOUT = 3V, TA = -40°C to +85°C, typical values are at TA = +25°C, unless otherwise noted. (Note 1))
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage VIN_MIN Runs from output after startup, IOUT = 1mA 400 mV
Input Voltage Range VIN Guaranteed by LX Maximum On-Time 0.95 5.5 V
Minimum Startup Input
Voltage VIN_STARTUP
RL ≥ 3kΩ, Typical Operating Circuit,
TA = 25°C 0.88 0.95 V
Output Voltage Range VOUT
See RSEL Selection table.
For VIN < VOUT target (Note 2) 1.8 5 V
Output Accuracy, LPM ACCLPM
VOUT falling, when LX switching frequency
is > 1MHz (Note 3) -1.5 +1.5 %
Output Accuracy,
Ultra-Low-Power Mode ACCULPM
VOUT falling, when LX switching frequency
is > 1kHz (Note 4) 1 2.5 4 %
Quiescent Supply Current
Into OUT IQ_OUT
MAX17220/2/4
EN = open after startup,
MAX17223/5 EN = VIN,
not switching, RSEL OPEN,
VOUT = 104% of 1.8V
TA= 25°C. 300 600
nA
MAX17220/2/4
EN = open after startup,
MAX17223/5 EN = VIN,
not switching, RSEL OPEN,
VOUT = 104% of 1.8V
TA = 85°C 470 900
Quiescent Supply Current
Into IN IQ_IN TA = 25°C 0.1 nA
Total Quiescent Supply
Current into IN LX EN IQ_IN_TOTAL
MAX17220/2/4 EN = Open after startup.
MAX17223/5 EN = VIN, not switching,
VOUT = 104% of VOUT target, total current
includes IN, LX, and EN, TA = 25ºC
0.5 100 nA
Shutdown Current Into IN ISD_IN
MAX17220/2/3/4/5, RL= 3kΩ, VOUT = VEN = 0V,
TA = 25ºC 0.1 nA
Total Shutdown Current
into IN LX ISD_TOTAL
MAX17220/2/3/4/5, RL= 3kΩ, VEN = VIN =
VLX = 3V, includes LX and IN leakage,
TA = 25ºC
0.5 100 nA
Inductor Peak Current
Limit IPEAK (Note 5)
MAX17220 180 225 270 mA
MAX17222/3 0.4 0.5 0.575 A
MAX17224/5 0.8 1 1.2
LX Maximum Duty Cycle DC (Note 6) 70 75 %
LX Maximum On-Time tON (Note 6) VOUT = 1.8V 280 365 450 ns
VOUT = 3V 270 300 330
LX Minimum Off-Time tOFF (Note 6) VOUT = 1.8V 90 120 150 ns
VOUT = 3V 80 100 120
LX Leakage Current ILX_LEAK VOUT = VEN = 0V
VLX = 1.5V,
TA = 25°C 0.3
nA
VLX = 5.5V,
TA= 85°C 30
Electrical Characteristics
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MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
(VIN = VEN = 1.5V, VOUT = 3V, TA = -40°C to +85°C, typical values are at TA = +25°C, unless otherwise noted. (Note 1))
Note 1: Limits are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed through
correlation using statistical quality control (SQC) methods.
Note 2: Guaranteed by the Required Select Resistor Accuracy parameter.
Note 3: Output Accuracy, Low Power mode is the regulation accuracy window expected when IOUT > IOUT_TRANSITION. See PFM
Control Scheme and VOUT ERROR vs ILOAD TOC for more details. This accuracy does not include load, line, or ripple.
Note 4: Output Accuracy, Ultra-Low Power mode is the regulation accuracy window expected when IOUT < IOUT_TRANSITION. See
PFM Control Scheme and VOUT ERROR vs. ILOAD TOC for more details. This accuracy does not include load, line, or ripple.
Note 5: This is a static measurement. See ILIM vs. VIN TOC. The actual peak current limit depends upon VIN and L due to propagation
delays.
Note 6: Guaranteed by measuring LX frequency and duty cycle
Note 7: This is a static measurement.
Note 8: This is the time required to determine RSEL value. This time adds to the startup time. See Output Voltage Selection.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
N-Channel On-Resistance RDS(ON) VOUT = 3.3V
MAX17220 124 270
MAX17222/3 62 135
MAX17224/5 31 70
P-Channel On-Resistance RDS(ON) VOUT = 3.3V
MAX17220 300 600
MAX17222/3 150 300
MAX17224/5 75 150
Synchronous Rectifier
Zero-Crossing as Percent
of Peak Current Limit
IZX VOUT = 3.3V (Note 7) 2.5 5 7.5 %
Enable Voltage Threshold VIL When LX switching stops, EN falling 300 500 mV
VIH EN rising 600 850
Enable Input Leakage IEN_LK
MAX17223/5, VEN = 5.5V, TA = 25°C 0.1 nA
MAX17220/2/4, VEN = 0V, TA= 25°C, 0.1
Enable Input Impedance MAX17220/2/4 100 200
Required Select Resistor
Accuracy RSEL
Use the nearest ±1% resistor from RSEL
Selection Table -1 +1 %
Select Resistor Detection
Time tRSEL VOUT = 1.8V, CRSEL < 2pF (Note 8) 360 600 1320 μs
Electrical Characteristics (continued)
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MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
(MAX17222ELT+, IN = 1.5V, OUT = 3V, L = 2.2μH Coilcraft XFL4020-222, CIN = 10μF, COUT = 10μF, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
40
45
50
55
60
65
70
75
-50 -25 025 50 75 100
ISUPPLY (nA)
TEMPERATURE (ºC)
TOTAL SYSTEM SHUTDOWN CURRENT
vs. TEMPERATURE toc01
WITH EXTERNAL RESISTOR
FROM IN TO EN
500.0
600.0
700.0
800.0
900.0
1000.0
1100.0
1200.0
1300.0
1400.0
-40 -15 10 35 60 85
ISUPPLY (nA)
TEMPERATURE (ºC)
TOTAL SYSTEM SUPPLY CURRENT
vs. TEMPERATURE toc02
EN = OPEN
0
50
100
150
200
250
300
350
0.5 1.0 1.5 2.0 2.5 3.0
IOUT MAX (mA)
INPUT VOLTAGE (V)
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
toc03
VOUT = 5V,
L = 1µH
VOUT = 3.3V,
L = 1µH
VOUT = 3V,
L = 1µH
0.0
50.0
100.0
150.0
200.0
250.0
300.0
350.0
400.0
0.5 1.5 2.5 3.5 4.5
I
OUT MAX
(mA)
INPUT VOLTAGE (V)
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
toc04
VOUT = 5V,
L = 2.2µH
VOUT = 3.3V,
L = 2.2µH
VOUT = 3V,
L = 2.2µH
100
200
300
400
500
600
700
800
0.50 1.00 1.50 2.00 2.50 3.00
INDUCTOR CURRENT LIMIT (mA)
INPUT VOLTAGE (V)
MAX17222ELT+
INDUCTOR CURRENT LIMIT
vs. INPUT VOLTAGE toc05
VOUT = 5V,
L = 2.2µH
VOUT = 3.3V,
L = 2.2µH
VOUT = 3.3V,
L = 1µH
VOUT = 5V,
L = 1µH
-4
-3
-2
-1
0
1
2
3
4
1100 10000 1000000
OUTPUT ERROR (%)
LOAD CURRENT (µA)
OUTPUT VOLTAGE ERROR
vs. LOAD CURRENT
(V
OUT
= 3.3V) toc06
VIN = 2.5V
VIN = 0.8V
VIN = 1V
VIN = 1.5V
VIN = 2V
40
50
60
70
80
90
100
110 100 1000 10000 100000 1000000
EFFICIENCY (%)
LOAD CURRENT (µA)
VIN = 1V
toc07
EFFICIENCY vs. LOAD CURRENT
(VOUT = 3.3V)
VIN = 1.5V
VIN = 2V
VIN = 2.5V
0
0.5
1
1.5
2
2.5
3
0.1 10 1000 100000
OPEN-CIRCUIT VOLTAGE (V)
LOAD CURRENT (µA)
RS = 1
STARTUP VOLTAGE vs. LOAD CURRENT
(VOUT = 3.3V)
toc08
RS IS THE SOURCE RESISTANCE
RS = 5
RS = 30
0
0
1
10
100
1000
110 100 1000 10000 100000 1000000
SWITCHING FREQUENCY (KHZ)
LOAD CURRENT (µA)
VIN = 1.5V, VOUT = 3V
toc09
SWITCHING FREQUENCY
vs. LOAD CURRENT
VIN = 3.2V, VOUT = 5V
Maxim Integrated
5
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MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
(MAX17222ELT+, IN = 1.5V, OUT = 3V, L = 2.2μH Coilcraft XFL4020-222, CIN = 10μF, COUT = 10μF, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
toc10
INTO AND OUT OF ULPM
LOAD TRANSIENT
IOUT
ILX
VLX
VOUT 100mV/div
(AC-COUPLED)
500mA/div
100mA/div
2V/div
VIN = 1.5V, VOUT = 3V, IOUT = 0 TO 180mA
200µs/div
toc11
INTO AND OUT OF LPM
LOAD TRANSIENT
ILX
VOUT
VLX
IOUT
2V/div
100mA/div
500mA/div
100mV/
AC-COUPLED)
VIN = 1.5V, VOUT = 3V, IOUT = 10mA TO 180mA
200µs/div
Maxim Integrated
6
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MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
(MAX17222ELT+, IN = 1.5V, OUT = 3V, L = 2.2μH Coilcraft XFL4020-222, CIN = 10μF, COUT = 10μF, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
/div
100
150
200
250
300
350
400
450
500
550
600
0.50 1.50 2.50 3.50 4.50
INDUCTOR CURRENT LIMIT (mA)
INPUT VOLTAGE (V)
MAX17220ENT+ INDUCTOR CURRENT LIMIT
vs. INPUT VOLTAGE toc18
VOUT =5V,
L = 2.2µH
VOUT = 3.3V,
L = 2.2µH
VOUT = 3.3V, L = 1µH
VOUT =5V , L = 1µH
VOUT =5V, L = 4.7µH
VOUT = 3.3V, L = 4.7µH
Maxim Integrated
7
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MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
PIN NAME FUNCTION
6 WLP µDFN
A1 1 OUT Output Pin. Connect a 10µF X5R ceramic capacitor (minimum 2µF capacitance) to ground.
A2 2 LX Switching Node Pin. Connect the inductor from IN to LX.
A3 3 GND Ground Pin.
B1 6 EN Active-High Enable Input. See Supply Current section for recommended connections.
B2 5 IN Input Pin. Connect a 10µF X5R ceramic capacitor (minimum 2µF capacitance) to ground.
Depending on the application requirements, more capacitance may be needed (i.e., BLE).
B3 4 SEL Output Voltage Select Pin. Connect a resistor from SEL to GND based on the desired
output voltage. See RSEL Selection table.
Bump Configuration
1
A
2
B
3
+
TOP VIEW
MAX1722x
WLP
OUT LX GND
EN
IN
SEL
EN1
2
3
6
5
4
IN
OUT
GND
LX
SEL
µDFN
MAX1722x
+
TOP VIEW
Bump Description
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MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
STARTUP
TRUE SHUTDOWN
OPTIONAL ENABLE PIN
TRANSIENT PROTECTION
CURRENT SENSE MODULATOR
REFERENCE
OUTPUT VOLTAGE
SELECTOR
RSEL
MAX17220/2/3/4/5
2.2µH
OUT
SEL
IN
LX
EN
GND
COUT
CIN
10µF
10µF
Functional Diagrams
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9
MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Detailed Description
The MAX17220/2/3/4/5 compact, high-efficiency, step-up
DC-DC converters have ultra-low quiescent current, are
guaranteed to start up with voltages as low as 0.95V, and
operate with an input voltage down to 400mV, depending
on load current. True Shutdown disconnects the input
from the output, saving precious battery life. Every detail
of the MAX17220/2/3/4/5 was carefully chosen to allow
for the lowest power and smallest solution size. Such
details as switching frequencies up to 2.5MHz, tiny package
options, a single-output setting resistor, 300ns fixed turn-
on time, as well as three current limit options, allow the
user to minimize the total solution size.
Supply Current
True Shutdown Current
The total system shutdown current (ISD_TOTAL_SYSTEM) is
made up of the MAX17220/2/3/4/5's total shutdown current
(ISD_TOTAL) and the current through an external pullup resis-
tor, as shown in Figure 1. ISD_TOTAL is listed in the Electrical
Characteristics table and is typically 0.5nA. It is important
to note that ISD_TOTAL includes LX and IN leakage cur-
rents. (See the Shutdown Supply Current vs. Temperature
graph in the Typical Operating Characteristics section.)
ISD_TOTAL_SYSTEM current can be calculated using the
formula below. For example, for the MAX17220/2/3/4/5 with
EN connected to an open-drain GPIO of a microcontroller,
a VIN = 1.5V, VOUT = 3V, and a 33MΩ pullup resistor,
ISD_TOTAL_SYSTEM current is 45.9nA.
IN
SD_TOTAL_SYSTEM SD_TOTAL PULLUP
V
I = I + R
1.5
0.5nA 45.9nA, (Figure 1)
33M
=+=
Figure 2 shows a typical connection of the MAX17223/5
to a push-pull microcontroller GPIO. ISD_TOTAL_SYSTEM
current can be calculated using the formula below. For
example, a MAX17223/5 with EN connected to a push-
pull microcontroller GPIO, VIN = 1.5V, and VOUT = 3V,
ISD_TOTAL_SYSTEM current is 0.5nA.
SD_TOTAL_SYSTEM SD_TOTAL
I = I 0.5nA
(Figure 2, Figure 3)
=
Figure 3 shows a typical connection of the MAX17220/2/4
with a push-button switch to minimize the ISD_TOTAL_
SYSTEM current. ISD_TOTAL_SYSTEM current can be
calculated using the formula above. For example, a
MAX17220/2/4 with EN connected as shown in Figure 3,
with VIN = 1.5V and VOUT = 3V, the ISD_TOTAL_SYSTEM
current is 0.5nA.
Figure 1. For All Versions, EN Pin Can Be Driven by an Open-
Drain Microcontroller GPIO.
Figure 2. Only the MAX17223/5’s EN Pin Can Be Driven by a
Push-Pull Microcontroller GPIO.
Figure 3. The MAX17220/2/4’s Total System Shutdown Current
Will Only Be Leakage If Able To Use Push-Button As Shown.
IN
SEL
GND
LX
IN OUT
MAX17220/2/3/4/5
OUT
EN
RPULLUP
33MΩ
µC
OPEN-DRAIN
GPIO
IN
SEL
GND
LX
IN
OUT
OUT
EN
VIO
MAX17223
MAX17225
µC
IN
SEL
GND
LX
IN
OUT
MAX17220/
MAX17222/
MAX17224
OUT
EN
33MΩ
µC
GPIO
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MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Enable Transient Protection (ETP) Current
The MAX17220/2/4 have internal circuitry that helps
protect against accidental shutdown by transients on the
EN pin. Once the part is started up, these parts allow the
voltage at IN to drop as low as 400mV while still keeping
the part enabled, depending on the load current. This
feature comes at the cost of slightly higher supply
current that is dependent on the pullup resistor resistance.
The extra supply current for this protection option can be
calculated by the equation below. For example, for the
MAX17220/2/4 used in the Figure 1 connection, a VIN
= 1.5V, VOUT = 3V, a 33MΩ pullup resistor and an 85%
efficiency, the IQ_ETP is expected to be 61.3nA.
OUT IN OUT
PULLUP IN
(V - V ) V
1
IQ_ETP = -1 ,
(R + 100k) V
(Figure1)

××

η


×× =


(3V-1.5V) 1 3V
IQ_ETP = -1 61.3nA,
(33M+100k) 0.85 1.5
(Figure1)
Use the efficiency η from the flat portion of the efficiency
typical operating curves while the device is in ultra-low-
power mode (ULPM). See the PFM Control Scheme
section for more info on ULPM. Do not use the efficiency
for your actual load current. If you are using the versions
of the part without enable input transient protection (using
MAX17223/5), or if you are using any part version and
the electrical path from the EN pin is opened after startup,
then there is no IQ_ETP current and it will be zero.
IQ_ETP = N
/
A = 0, (Figure 2)
OUT OUT
PULLUP IN
(V ) V
1
IQ_ETP = ,
(R + 100k) V
(Figure 3)

××

η

(3V) 1 3V
IQ_ETP = 213.2nA,
(33M + 100k) 0.85 1.5V
(Figure 3)

×× =


Quiescent Current
The MAX17220/2/3/4/5 has ultra-low quiescent current
and was designed to operate at low input voltages by
bootstrapping itself from its output by drawing current
from the output. Use the equation below to calculate
the total system quiescent current IQ_TOTAL_SYSTEM
using the efficiency η from the flat portion of the
efficiency graph in the Typical Operating Characteristics
section while the device is in ULPM. See the PFM control
scheme section for more info on ULPM. Do not use the
efficiency for your actual load current. To calculate the
IQ_ETP for the MAX17220/2/4, see the Enable Transient
Protection (ETP) Current section. If you are using the
versions of the part without enable input transient protection
(using MAX17223/5) or if you are using any part version
and the electrical path from the EN pin is opened after startup,
then the IQ_ETP current will be zero. For example, for the
MAX17223/5, a VIN = 1.5V, VOUT = 3V, and an 85%
efficiency, the IQ_TOTAL_SYSTEM is 706.4nA.

η×


IN
OUT
IQ_OUT
IQ_TOTAL_SYSTEM = IQ_IN_TOTAL + V
V
(MAX17223/5)
=

×

300nA
IQ_TOTAL_SYSTEM = 0.5nA + 706.4nA,
1.5V
0.85 3V
(MAX17223/5)
IN
OUT
IQ_OUT
IQ_TOTAL_SYSTEM = IQ_IN_TOTAL + + IQ_ETP,
V
V
(MAX17220/2/4)

η×


×

300nA
IQ_TOTAL_SYSTEM = 0.5nA + + 61.3nA = 767.7nA,
1.5V
0.85 3V
(MAX17220/2/4)
PFM Control Scheme
The MAX17220/2/3/4/5 utilizes a fixed on-time, current-
limited, pulse-frequency-modulation (PFM) control
scheme that allows ultra-low quiescent current and high
efficiency over a wide output current range. The inductor
current is limited by the 0.225A/0.5A/1A N-channel
current limit or by the 300ns switch maximum on-time.
During each on cycle, either the maximum on-time or the
maximum current limit is reached before the off-time of
the cycle begins. The MAX17220/2/3/4/5's PFM control
scheme allows for both continuous conduction mode
(CCM) or discontinuous conduction mode (DCM). When
the error comparator senses that the output has fallen
below the regulation threshold, another cycle begins. See
the MAX17220/2/3/4/5 simplified functional diagram.
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MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
The MAX17220/2/3/4/5 automatically switches between
the ULPM, low-power mode (LPM) and high-power mode
(HPM), depending on the load current. Figure 4 and
Figure 5 show typical waveforms while in each mode.
The output voltage, by design, is biased 2.5% higher
while in ULPM so that it can more easily weather a future
large load transient. ULPM is used when the system is
in standby or an ultra-low-power state. LPM and HPM
are useful for sensitive sensor measurements or during
wireless communications for medium output currents
and large output currents respectively. The user can
calculate the value of the load current where ULPM transi-
Figure 5. ULPM, LPM, and HPM Waveforms (Part 2).
Figure 4. ULPM, LPM, and HPM Waveforms (Part 1).
VOUT TARGET
VOUT TARGET - LOAD REG
VOUT TARGET + 2.5%
ULTRA LOW POWER MODE (UPLM): LIGHT LOADS
HIGH POWER MODE (HPM): HEAVY LOADS
VOUT
TIME
LOAD DEPENDENT
LOW POWER MODE (LPM): MEDIUM LOADS
CCM
DCM
DCM
17.5µs
650ns
100ms
7µs
VOUT TARGET
VOUT TARGET - LOAD REG
VOUT TARGET + 2.5%
ULTRA-LOW POWER MODE (UPLM): LIGHT LOADS
HIGH POWER MODE (HPM): HEAVY LOADS
VOUT
TIME
LOAD DEPENDENT
LOW POWER MODE (LPM): MEDIUM LOADS
CCM
DCM
DCM
17.5µs
750ns
5µs
www.maximintegrated.com Maxim Integrated
12
MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
tions to LPM using the equation below. For example, for
VIN = 1.5V, VOUT = 3V and L = 2.2µH, the UPLM to LPM
transition current happens at approximately 1.49mA and
a no-load frequency of 11.5Hz. The MAX17220/2/3/4/5
enters HPM when the inductor current transitions from
DCM to CCM.
2IN
OUT
IN
2
V
300ns
IOUT_TRANSITION =
V
2L 17.5 s
-1
V
300ns 1.5V 0.85 1.49mA
3V
2 2.2 H 17.5 s
-1
1.5V




η


××


 µ









= × ×=



×µ µ





The minimum switching frequency can be calculated by
this equation below:
SW(MIN)
1 IQ
f17.5 s IOUT_TRANSITION
= ×
µ
SW(MIN)
1 300nA
f = = 11.5Hz
17.5 s 1.49mA
×
µ
Operation with VIN > VOUT
If the input voltage (VIN) is greater than the output voltage
(VOUT) by a diode drop (VDIODE varies from ~0.2V at
light load to ~0.7V at heavy load), then the output voltage
is clamped to a diode drop below the input voltage (i.e.,
VOUT = VIN - VDIODE).
When the input voltage is closer to the output voltage target
(i.e., VOUT target + VDIODE > VIN > VOUT target) the
MAX17220–MAX17225 operate like a buck converter.
Design Procedure
Output Voltage Selection
The MAX17220/2/3/4/5 has a unique single-resistor output
selection method known as RSEL, as shown in Figure 6.
At startup, the MAX17220/2/3/4/5 uses up to 200µA only
during the select resistor detection time, typically for
600µs, to read the RSEL value. RSEL has many benefits,
which include lower cost and smaller size, since only one
resistor is needed versus the two resistors needed in typical
feedback connections. Another benefit is RSEL allows
our customers to stock just one part in their inventory
system and use it in multiple projects with different output
voltages just by changing a single standard 1% resistor.
Lastly, RSEL eliminates wasting current continuously through
feedback resistors for ultra low power battery operated
products. Select the RSEL resistor value by choosing the
desired output voltage in the RSEL Selection Table.
Figure 6. Single RSEL Resistor Sets the Output Voltage.
IN
SEL
GND
LX
IN
GND
OUT
MAX1722X
OUT
EN
EN
RSEL
www.maximintegrated.com Maxim Integrated
13
MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Inductor Selection
A 2.2µH inductor value provides the best size and efficiency
tradeoff in most applications. Smaller inductance values
typically allow for the smallest physical size and larger
inductance values allow for more output current assuming
continuous conduction mode (CCM) is achieved. Most
applications are expected to use a 2.2µH, as shown in
the example circuits. For low input voltages, 1µH will
work best. If one of the example application circuits do not
provide Enough output current, use the equations below
to calculate a larger inductance value that meets the
output current requirements, assuming it is possible to
achieve. For the equations below, choose an IIN between
0.9 x ILIM and half ILIM. It is not recommended to use an
inductor value smaller than 1µH or larger than 4.7µH. See
the Typical Operating Characteristics section for choosing
the value of efficiency η using the closest conditions for
your application. An example calculation has been
provided for the MAX17222 that has an ILIM = 500mA,
a VIN (min) = 1.8V, a VOUT = 3V, and a desired IOUT
of 205mA, which is beyond one of the 2.2µH example
circuits. The result shows that the inductor value can be
changed to 3.3µH to achieve a little more output current.
OUT OUT
IN IN
LIM IN LIM
VI 3V 205mA
I = = 402mA;
V 0.85 1.8V
I < I < 0.9 I
××
=
η× ×
×
LIM IN
I=(I - I ) 2 = (500mA - 402mA) 2 = 196mA∆× ×
IN ON(MAX)
MIN
Vt 1.8V 300ns
L = = 2.76 H
I 196mA
= > 3.3 H closest standard value
××
= µ
µ
Capacitor Selection
Input capacitors reduce current peaks from the battery
and increase efficiency. For the input capacitor, choose a
ceramic capacitor because they have the lowest equivalent
series resistance (ESR), smallest size, and lowest cost.
Choose an acceptable dielectric such as X5R or X7R.
Other capacitor types can be used as well but will have
larger ESR. The biggest down side of ceramic capacitors is
their capacitance drop with higher DC bias and because
of this at minimum a standard 10µF ceramic capacitor
is recommended at the input for most applications. The
minimum recommended capacitance (not capacitor) at
the input is 2µF for most applications. For applications
that use batteries that have a high source impedance
greater than 1Ω, more capacitance may be needed. A
good starting point is to use the same capacitance value at
the input as for the output.
VOUT
(V)
STD RES
1% (kΩ)
1.8 OPEN
1.9 909
2.0 768
2.1 634
2.2 536
2.3 452
2.4 383
2.5 324
2.6 267
2.7 226
2.8 191
2.9 162
3.0 133
3.1 113
3.2 95.3
3.3 80.6
3.4 66.5
3.5 56.2
3.6 47.5
3.7 40.2
3.8 34
3.9 28
4.0 23.7
4.1 20
4.2 16.9
4.3 14
4.4 11.8
4.5 10
4.6 8.45
4.7 7.15
4.8 5.9
4.9 4.99
5.0 SHORT
RSEL Selection Table
www.maximintegrated.com Maxim Integrated
14
MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
The minimum output capacitance that ensures stability is
2µF. At minimum a standard 10µF X5R (or X7R) ceramic
capacitor is recommended for most applications. Due to
DC bias effects the actual capacitance can be 80% lower
than the nominal capacitor value. The output ripple can be
calculated with the equation below. For example, For the
MAX17220/2/3/4/5 with a VIN = 1.5V, VOUT = 3V, and an
effective capacitance of 5µF, a capacitor ESR of 4mΩ, the
expected ripple is 7mV.
OFF OUT
V_RIPPLE = IL_PEAK ESR_COUT
11
+ IL_PEAK t
2 C (Effective)
×
××
Where,
IN ON
V1.5V
IL_PEAK = t 300ns = 204mA
L 2.2 H
×= ×
µ
IN
OFF ON OUT IN
V1.5V
t = t 300ns 300ns
V -V 3V -1.5V


× =×=




COUT (Effective) = 5µF, ESR_COUT for Murata
GRM155R61A106ME44 is 4mΩ from 200kHz to 2MHz
1
V_RIPPLE = 204mA 4m + 204mA
2
1
300ns = 7mV
5F
×Ω
××
µ
PCB Layout Guidelines
Careful PC board layout is especially important in a nano-
current DC-DC converters. In general, minimize trace
lengths to reduce parasitic capacitance, parasitic resistance
and radiated noise. Remember that every square of 1oz
copper will result in 0.5mΩ of parasitic resistance. The
connection from the bottom of the output capacitor and
the ground pin of the device must be extremely short
as should be that of the input capacitor. Keep the main
power path from IN, LX, OUT, and GND as tight and short
as possible. Minimize the surface area used for LX since
this is the noisiest node. Lastly, the trace used for RSEL
should not be too long nor produce a capacitance of more
than a few pico Farads.
www.maximintegrated.com Maxim Integrated
15
MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Applications Information
Primary Cell Bluetooth Low Energy (BLE) Temperature Sensor Wearable
Figure 7. MAX1722x/MAX30205 Temperature Sensor Wearable Solution
LP BLE/NFC µC
WITH INTERNAL BUCK
GND
MAX30205
MEDICAL GRADE
TEMP SENSOR
BLE RADIO
DC-DC
BUCK
3V
1.3V
NFC
I2C PORT
MAX1722X
BOOST
3V
MAX1725
LDO
2.75V
ARM®
CORTEX®
M4 FLASH
RAM
OPTIONAL LDO
BATTERY
SILVER OXIDE
ZINC AIR
AAAA
AAA
AA
*LOAD CURRENT DEPENDENT
400mV* TO 1.6V
ARM is a registered trademark and registered service mark and Cortex
is a registered trademark of ARM Limited.
www.maximintegrated.com Maxim Integrated
16
MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Primary Cell Bluetooth Low Energy (BLE) Optical Heart Rate Monitoring (OHRM) Sensor Wearable
Figure 8. MAX1722x/MAX30110/MAX30101/MAX30102 Optical Heart Rate Monitor (OHRM) Sensor Wearable Solution for Primary Cells.
LP BLE/NFC µC
WITH INTERNAL BUCK
GND
MAX30110
MAX30101
MAX30102
OHRM
0.8V TO 1.6V
BLE RADIO
DC-DC
BUCK
3.3V
3.6V MAX
1.3V
NFC
I
2
C PORT
MAX1722X
BOOST
3.3V LED SUPPLY
(OR ADJ TO 5V)
ARM
CORTEX
M4 FLASH
RAM
BATTERY
SILVER OXIDE
ZINC AIR
AAAA
AAA
AA
www.maximintegrated.com Maxim Integrated
17
MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Secondary Rechargable Lithium Cell Bluetooth Low Energy (BLE) Optical Heart Rate Monitor
(OHRM) Sensor Wearable
Supercap Backup Solution for Real-Time Clock (RTC) Preservation
Figure 9. MAX1722x/MAX30110/MAX30101/MAX30102 Optical Heart Rate Monitor (OHRM) Sensor Wearable Solution for
Secondary Cells.
Figure 10. MAX1722x/MAX14575/DS1341 RTC Backup Solution.
MAX30110
MAX30101
MAX30102
OHRM
2.7V TO 4.2V
µC
MAX32625/26
MAX32620/21
MAX1722X
BOOST
5V
MAX8880
LDO
4.5V
OPTIONAL LDO LED SUPPLY
BATTERY
Li+ I2C
OR
ADJ
MAX14575
ADJ CURRENT
LIMIT
SUPERCAP
MAX1722X
BOOST
INTERNAL
LOAD
DISCONNECT
3.3V
2.3V TO 5.5V
SOURCE
VCAP = 400mV TO 5.5V
REVERSE CURRENT- BLOCKING
DS1341
RTC
VCAP = 5V TO 3.8V ≥ VOUT = VCAP - VDIODE
VCAP = 3.8V TO 400mV ≥ VOUT = 3.3V
REGULATE WITH SUPERCAP DOWN TO 400mV!
www.maximintegrated.com Maxim Integrated
18
MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
Supercap Backup Solution to Maintain Uniform Sound for Alarm Beeper Buzzers
Zero Reverse Current in True Shutdown for Multisource Applications
Figure 11. MAX1722x/MAX14575 Solution for Alarm Beeper Buzzers.
Figure 12. MAX1722x Has Zero Reverse Current in True Shutdown.
MAX14575
ADJ CURRENT
LIMIT
SUPERCAP
MAX1722X
BOOST
INTERNAL
LOAD
DISCONNECT
5V
2.3V TO 5.5V
SOURCE
VCAP = 400mV TO 5.5V
REVERSE CURRENT- BLOCKING
ALARM
BEEPER
BUZZER
VCAP = 5.5V TO 400mV* ≥ VOUT = 5V
*LOAD DEPENDENT
UNIFORM ALARM WITH SUPERCAP DOWN TO 400mV!*
2.7V TO 4.2V
MAX1722X
BOOST
ENABLED
ZERO REVERSE CURRENT IN SHUTDOWN
BATTERY
Li+
MAX1722X
BOOST
SHUTDOWN
SOLAR CELLS
MAX1722X
BOOST
SHUTDOWN
CIRCUIT
(LOAD)
USB
SUPERCAP
0UA
0UA
0UA
ILOAD
5V
www.maximintegrated.com Maxim Integrated
19
MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
CIN
10µF
IN
SEL
GND
LX
IN
0.8V TO 3V
GND
OUT
3.3V,16mA
3V, 20mA
MAX17222
MAX17223
OUT
EN
EN
COUT
10µF
L1 1µH
L1 1µH/0603 MURATA DFE160808S-1R0M
CIN 10µF/0402/X5R/6.3V MURATA GRM155R60J106ME44
COUT 10µF/0402/X5R/10V MURATA GRM155R61A106ME44
3.3V OUTPUT RSEL 80.6K ±1%
3V OUTPUT RSEL 133K ±1%
RSEL
STARTUP
0.88 (TYP)
CIN
10µF
IN
SEL
GND
LX
IN
1.8V TO 3V
GND
OUT
3.3V, 160mA
3V, 185mA
MAX17222
MAX17223
OUT
EN
EN
COUT
10µF
L1 2.2µH
L1 2.2µH/0603 MURATA DFM18PAN2R2MG0L
CIN 10µF/0402/X5R/6.3V MURATA GRM155R60J106ME44
COUT 10µF/0402/X5R/10V MURATA GRM155R61A106ME44
3.3V OUTPUT RSEL 80.6K ±1%
3V OUTPUT RSEL 133K ±1%
RSEL
CIN
10µF
IN
SEL
GND
LX
IN
0.8V TO 1.8V
GND
OUT
2V, 90mA
1.8V,100mA
MAX17222
MAX17223
OUT
EN
EN
COUT
10µF
L1 2.2µH
RSEL
STARTUP
0.88 (TYP)
CIN
10µF
IN
SEL
GND
LX
IN
2.7V TO 4.2
GND
OUT
5V, 160mA
3.3V*, 250mA
MAX17222
MAX17223
OUT
EN
EN
COUT
10µF
L1 2.2µH
L1 2.2µH/0603 MURATA MFD160810-2R2M
CIN 10µF/0402/X5R/6.3V MURATA GRM155R60J106ME44
COUT 10µF/0402/X5R/10V MURATA GRM155R61A106ME44
5V OUTPUT RSEL SHORT TO GND (NO RESISTOR)
3.3V OUTPUT RSEL 80.6K ±1%
RSEL
L1 2.2µH/0603 MURATA MFD160810-2R2M
CIN 10µF/0402/X5R/6.3V MURATA GRM155R60J106ME44
COUT 10µF/0402/X5R/10V MURATA GRM155R61A106ME44
2V OUTPUT RSEL 768K ±1%
1.8V OUTPUT RSEL OPEN (NO RESISTOR)
* = IN < OUT
Typical Application Circuits
Smallest Solution Size—0603 Inductor—MAX17222/MAX17223 500mA ILIM (Part 1)
Smallest Solution Size—0603 Inductor—MAX17222/MAX17223 500mA ILIM (Part 2)
www.maximintegrated.com Maxim Integrated
20
MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
C
IN
10µF
IN
SEL
GND
LX
IN
0.8V TO 3V
GND
OUT
3.3V,18mA
3V, 22mA
MAX17222
MAX17223
OUT
EN
EN
C
OUT
10µF
L1 1µH
L1 1µH/4X4X2.1MM COILCRAFT XFL4020-102
C
IN
10µF/0402/X5R/6.3V MURATA GRM155R60J106ME44
C
OUT
10µF/0402/X5R/10V MURATA GRM155R61A106ME44
3.3V OUTPUT R
SEL
80.6K ±1%
3V OUTPUT R
SEL
133K ±1%
R
SEL
STARTUP
0.88 (TYP)
C
IN
10µF
IN
SEL
GND
LX
IN
1.8V TO 3V
GND
OUT
3.3V, 185mA
3V, 200mA
MAX17222
MAX17223
OUT
EN
EN
C
OUT
10µF
L1 2.2µH
L1 2.2µH/4X4X2.1MM COILCRAFT XFL4020-222
C
IN
10µF/0402/X5R/6.3V MURATA GRM155R60J106ME44
C
OUT
10µF/0402/X5R/10V MURATA GRM155R61A106ME44
3.3V OUTPUT R
SEL
80.6K ±1%
3V OUTPUT R
SEL
133K ±1%
R
SEL
C
IN
10µF
IN
SEL
GND
LX
IN
0.8V TO 1.8V
GND
OUT
2V, 115mA
1.8V,120mA
MAX17222
MAX17223
OUT
EN
EN
C
OUT
10µF
L1 2.2µH
R
SEL
STARTUP
0.88 (TYP)
C
IN
10µF
IN
SEL
GND
LX
IN
2.7V TO 4.2V
GND
OUT
5V, 185mA
3.3V*, 285mA
MAX17222
MAX17223
OUT
EN
EN
C
OUT
10µF
L1 2.2µH
L1 2.2µH/4X4X3MM WURTH 74438357022CIN
C
IN
10µF/0402/X5R/6.3V MURATA GRM155R60J106ME44
C
OUT
10µF/0402/X5R/10V MURATA GRM155R61A106ME44
5V OUTPUT R
SEL
SHORT TO GND (NO RESISTOR)
3.3V OUTPUT R
SEL
80.6K ±1%
R
SEL
L1 2.2µH/4X4X2.1MM COILCRAFT XFL4020-222
C
IN
10µF/0402/X5R/6.3V MURATA GRM155R60J106ME44
C
OUT
10µF/0402/X5R/10V MURATA GRM155R61A106ME44
2V OUTPUT R
SEL
768K ±1%
1.8V OUTPUT R
SEL
OPEN (NO RESISTOR)
* = IN < OUT
Highest Efficiency Solution—4mm x 4mm Inductor—MAX17222/MAX17223 500mA ILIM (Part 1)
Highest Efficiency Solution—4 x 4mm Inductor—MAX17222/MAX17223 500mA ILIM (Part 2)
Typical Application Circuits (continued)
www.maximintegrated.com Maxim Integrated
21
MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
PART NUMBER TEMPERATURE
RANGE PIN-PACKAGE
INPUT PEAK
CURRENT
IPEAK
TRUE SHUTDOWN
ENABLE TRANSIENT
PROTECTION
(ETP)
MAX17220ENT+ -40°C to +85°C 6 WLP 225mA Yes Yes
MAX17222ENT+ -40°C to +85°C 6 WLP 0.5A Yes Yes
MAX17223ENT+ -40°C to +85°C 6 WLP 0.5A Yes
MAX17224ENT+ -40°C to +85°C 6 WLP 1A Yes Yes
MAX17225ENT+ -40°C to +85°C 6 WLP 1A Yes
MAX17220ELT+ -40°C to +85°C 6 μDFN 225mA Yes Yes
MAX17222ELT+ -40°C to +85°C 6 μDFN 0.5A Yes Yes
MAX17223ELT+ -40°C to +85°C 6 μDFN 0.5A Yes
MAX17224ELT+ -40°C to +85°C 6 μDFN 1A Yes Yes
MAX17225ELT+ -40°C to +85°C 6 μDFN 1A Yes
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Ordering Information
www.maximintegrated.com Maxim Integrated
22
MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 2/17 Initial release
1 4/17 Updated Electrical Characteristics and Ordering Information tables and added
Operation with VIN > VOUT section 3, 8, 13, 19, 21
2 5/17 Removed MAX17221 part number, general data sheet updates 1–23
3 7/17
Updated Shutdown Current into IN and Total Shutdown Current into IN LX conditions,
Note 5, TOC 5, True Shutdown Current section, Figure 10, added TOC 18, removed
future product references (MAX17220ENT+, MAX17224ENT+, MAX17220ELT+,
MAX17223ELT+, and MAX17224ELT+)
3–5, 7, 10,
18, 22
Revision History
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2017 Maxim Integrated Products, Inc.
23
MAX17220–MAX17225 400mV to 5.5V Input, nanoPower Synchronous
Boost Converter with True Shutdown
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

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