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MAX1702BETX+ |MAX1702BETXMAXIMN/a23avaiTriple-Output Power-Management IC for Microprocessor-Based Systems
MAX1702BETX+TMAXIMN/a3avaiTriple-Output Power-Management IC for Microprocessor-Based Systems


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MAX1702BETX+-MAX1702BETX+T
Triple-Output Power-Management IC for Microprocessor-Based Systems
General Description
The MAX1702B power-management IC supports ARM
Powered® devices such as the Intel® PXA210 and
PXA250 microprocessors based on the Intel XScale™
micro-architecture. These devices include PDAs, third-
generation smart cellular phones, internet appliances,
automotive in-dash Telematics systems, and other appli-
cations requiring substantial computing and multimedia
capability at low power.
The MAX1702B integrates three ultra-high-performance
power supplies with associated supervisory and manage-
ment functions. Included is a step-down DC-DC converter
to supply 3.3V I/O and peripherals, a step-down DC-DC
converter to supply 0.7V to VIN for the microprocessor
core, and a step-down DC-DC converter to supply either
1.8V, 2.5V, or 3.3V to power the memory.
Management functions include automatic power-up
sequencing, power-on-reset and manual reset with timer,
and two levels of low-battery detection.
The DC-DC converters use fast 1MHz PWM switching,
allowing the use of small external components. They
automatically switch from PWM mode under heavy loads
to skip mode under light loads to reduce quiescent cur-
rent and maximize battery life. The input voltage range is
from 2.6V to 5.5V, allowing the use of three NiMH cells,
a single Li+ cell, or a regulated 5V input. The MAX1702B
is available in a tiny 6mm x 6mm, 36-pin QFN package
and operates over the -40°C to +85°C temperature range.
Applications
●PDA, Palmtop, and Wireless Handhelds●Third Generation Smart Cell Phones●Internet Appliances and Web Books
Features
●Three Regulators in One Package Peripherals and I/O Supply: 3.3V at 900mA • μP Core Supply: 0.7V to VIN at 400 mA Memory Supply: 1.8/2.5/3.3V at 800 mA●Supports Intel® PXA210 and PXA250
Microprocessors●Power-On Reset with Manual Reset Input●Auto Power-Up Sequencing●1MHz PWM Switching Allows Small External
Components●Low 5μA Shutdown Current●Tiny 6mm x 6mm, 36-pin QFN Package
Typical Operating Circuit appears at end of data sheet.

Intel is a registered trademark of Intel Corporation.
XScale is a trademark of Intel Corporation.
ARM and ARM Powered are registered trademarks of ARM
Limited.
PARTTEMP RANGEPIN-PACKAGE

MAX1702BEGX-40°C to +85°C36 QFN
(6mm x 6mm)
MAX1702B
6mm x 6mm QFN

TOP VIEW3334353628293031
N.C.INP3LX3PG3N.C.COMP3OUT3131514161210
PG1
LX1
N.C.
INP1
COMP1
N.C.N.C.
INP2
LX2
PG2
OUTOK
COMP2
OUT1
N.C.GND
REFN.C.
GND
PGM3
ON2
DBI
LBIN.C.
FB217
N.C.
RSO
LBO
MAX1702BTriple Output Power Management IC for
Microprocessor-Based Systems
Ordering Information
Pin Coniguration
IN, FB2, OUT3, COMP1, COMP2, COMP3, PGM3,
ON2, LBO, OUTOK, RSO, MR, LBI, DBI,OUT1 to GND ......................................................-0.3V to +6V
REF to GND .................................................-0.3 to (VIN + 0.3V)
INP1, INP2, INP3 to IN.........................................-0.3V to +0.3V
PG1, PG2, PG3 to GND.......................................-0.3V to +0.3V
LX1, LX2, LX3 Continous Current ..........................-1.5A to 1.5A
INP1 to PG1 ............................................................-0.3V to +6V
INP2 to PG2 ............................................................-0.3V to +6V
INP3 to PG3 .............................................................0.3V to +6V
Output Short-Circuit Duration ...........................................Infinite
Continuous Power Dissipation (TA =+70°C) 36-Pin QFN(derate 22.7 mW/°C) .................................................1818mW
Operating Temperature Range .............................40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
(VINP1 = VINP2 = VINP3 = VIN = 3.6V, VLBI = 1.1V, VDBI = 1.35V, MR = ON2 = IN, PGM3 = GND, Circuit of Figure 1, TA = -40°C to
+85°C unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETERCONDITIONSMINTYPMAXUNITS

INP1, INP2, INP3,
IN Supply Voltage Range
INP1, INP2, INP3, IN must be connected together
externally2.65.5V
Undervoltage
Lockout Threshold
VIN rising 2.252.402.55V
VIN falling 2.2 2.352.525
Quiescent Current
(IINP1 + IINP2 + IINP3 + IIN)
ON2 = IN, no load485µA
ON2 = GND, no load335µA
VDBI < 1.2 V (shutdown)
LX1-3 = GND520µA
SYNCHRONOUS BUCK PWM REGULATOR 1 (REG1)

OUT1 Voltage Accuracy3.6V ≤ VINP1 ≤ 5.5V, Load = 0 to 900mA3.2343.33.366V
OUT1 Input Resistance200400kΩ
Error-Amp Transconductance5595135µS
Dropout VoltageLoad = 800mA, Note 1250425mV
P-Channel On-Resistance
ILX1 = 180mA0.250.4Ω
ILX1 = 180mA, VINP1 = 2.6V0.30.5Ω
N-Channel On-ResistanceILX1 = 180mA0.20.35Ω
Current-Sense Transresistance0.400.470.54V/A
P-Channel
Current-Limit Threshold1.151.2751.45A
P-Channel Pulse-Skipping
Current Threshold0.115 0.140 0.160A
N-Channel Zero
Crossing Comparator255575mA
OUT1 Maximum
Output Current2.6V ≤ VINP1 ≤ 5.5V (Note 2)0.9A
LX1 Leakage CurrentVINP1 = 5.5V, LX1= GND or INP1, VOUT1 = 3.6V -200.1+20µA
MAX1702BTriple Output Power Management IC for
Microprocessor-Based Systems
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.
Electrical Characteristics
(VINP1 = VINP2 = VINP3 = VIN = 3.6V, VLBI = 1.1V, VDBI = 1.35V, MR = ON2 = IN, PGM3 = GND, Circuit of Figure 1, TA = -40°C to
+85°C unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETERCONDITIONSMINTYPMAXUNITS

OUT1 Discharge ResistanceVOUT1 = 3.3V, VDBI = 1V300
(Note 3)Ω
SYNCHRONOUS BUCK REGULATOR 2 (REG2)

FB2 Regulation Voltage2.6V ≤ VINP2 ≤ 5.5V, load = 0 to 400mA0.6860.70.714V
FB Input CurrentVFB = 0.7V1150nA
Error-Amp Transconductance150250350µS
Dropout VoltageLoad = 400mA (Note 1)150250mV
P-Channel On-ResistanceILX2 = 180mA0.250.4Ω
ILX2 = 180mA, VINP2 = 2.6V0.30.5Ω
N-Channel On-ResistanceILX2 = 180mA0.20.35Ω
Current-Sense Transresistance0.400.470.54V/A
P-Channel
Current-Limit Threshold 1.151.2751.45A
P-Channel Pulse-Skipping
Current Threshold0.1150.1400.160mA
N-Channel Zero-Crossing
Comparator255575mA
OUT2 Maximum Output2.6V ≤ VINP2 ≤ 5.5V (Note 2)0.4A
LX2 Leakage CurrentVINP2 = 5.5V, LX2 = GND or INP2,VFB2 = 1V-200.120µA
LX2 Duty-Cycle RangeVINP2 = 4.2V0100%
LX2 Discharge ResistanceVLX2 = VDBI = 1V300Ω
SYNCHRONOUS BUCK REGULATOR 3 (REG3)

OUT3 Voltage Accuracy
PGM3 = GND, 3.6V ≤ VINP3_≤ 5.5V,
Load = 0 to 800mA1.7641.81.836PGM3 = REF, 3.6V≤ VINP3_≤ 5.5V,
Load = 0mA to 800mA2.452.52.55
PGM3 = IN, 3.6V≤ VINP3_≤ 5.5V,
Load = 0mA to 800mA3.2343.33.366
OUT3 Input Resistance
PGM3 = GND340650PGM3 = REF200400
PGM3 = IN160320
Error-Amp Transconductance
PGM3 = GND105175245PGM3 = REF75125175
PGM3 = IN5595135
Dropout VoltageLoad = 800mA, Note 1220400mV
P-Channel On-ResistanceILX3 = 180mA0.250.4Ω
ILX3 = 180mA, VINP3 = 2.6V0.30.5Ω
MAX1702BTriple Output Power Management IC for
Microprocessor-Based Systems
Electrical Characteristics (continued)
(VINP1 = VINP2 = VINP3 = VIN = 3.6V, VLBI = 1.1V, VDBI = 1.35V, MR = ON2 = IN, PGM3 = GND, Circuit of Figure 1, TA = -40°C to
+85°C unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETERCONDITIONSMINTYPMAXUNITS

Current-Sense Transresistance0.400.470.54V/A
P-Channel
Current-Limit Threshold1.151.2751.45A
P-Channel Pulse-Skipping
Current Threshold0.1150.140 0.160A
N-Channel Zero-Crossing
Comparator255575mA
OUT3 Maximum Output Current2.6V ≤ VINP3_≤ 5.5V (Note 2)0.8A
LX3 Leakage CurrentVINP3 = 5.5V, LX3 = GND or INP3, VOUT3 = 3.6V-200.1+20µA
LX3 Duty-Cycle RangeVINP3 = 4.2V0100%
OUT3 Discharge ResistanceVOUT3 = 3.3V, VDBI = 1V300
(Note 3)Ω
REFERENCE

REF Output Voltage1.2251.251.275V
REF Load Regulation10µA < IREF < 100µA2.56.25mV
REF Line Regulation2.6V < VBATT < 5.5V 0.65mV
OSCILLATOR

Switching Frequency0.8511.15MHz
THERMAL SHUTDOWN

Thermal Shutdown TemperatureTJ rising160°C
Thermal Shutdown Hysteresis15°C
SUPERVISORY/MANAGEMENT FUNCTIONS

Reset TimeoutMR rising to RSO rising 5565.575ms
OUTOK Trip ThresholdVFB2 rising9495.597.5%
VFB2 falling 9192.594
OUTOK, LBO
Minimum Assertion Time107126145µs
LBI Input ThresholdVLBI falling0.981.000 1.02V
VLBI rising1.001.0201.04
LBI Input Bias CurrentVLBI = 0.95V 0.020.1µA
DBI Input Threshold
VDBI falling, TA = 0°C to +85°C1.21031.2351.2597
VDBI rising, TA = 0°C to +85°C1.23451.25971.2849
VDBI falling, TA = -40°C to +85°C1.1981.2351.273
VDBI rising, TA = -40°C to +85°C1.2211.2601.298
DBI Input Bias CurrentVDBI = 1.25V0.010.1µA
MAX1702BTriple Output Power Management IC for
Microprocessor-Based Systems
Electrical Characteristics (continued)
(VINP1 = VINP2 = VINP3 = VIN = 3.6V, VLBI = 1.1V, VDBI = 1.35V, MR = ON2 = IN, PGM3 = GND, Circuit of Figure 1, TA = -40°C to
+85°C unless otherwise noted. Typical values are at TA = +25°C.)
Note 1:
Dropout voltage is not tested. Guaranteed by P-channel switch resistance and assumes a 72mΩ (REG1 and REG3) or 162mΩ (REG2) maximum ESR of inductor.
Note 2:
The maximum output current is guaranteed by the following equation:OUTLIM
OUT(MAX)(1D)I2LI(1D)1(RR)2L−׃×=−++׃×
where:
OUTOUT(MAX)NLOUT(MAX)NPI(RR)VI(RR)++=++and: RN = N-channel synchronous rectiier RDSON
RP = P-channel power switch RDSON
RL = external inductor ESR
IOUT(MAX) = maximum required load currentƒ = operating frequency minimumL = external inductor value
Note 3:
Speciied resistance is in series with an internal diode to LX2.
Note 4:
Speciications to -40°C are guaranteed by design and not production tested.
PARAMETERCONDITIONSMINTYPMAXUNITS

RSO, LBO, OUTOK
Output Low Level
2.6V ≤ VIN_ ≤ 5.5V, sinking 1mA0.4V
VIN_ = 1V, sinking 100µA0.4
RSO, LBO, OUTOK
Output High Leakage CurrentVRSO = VLBO = VOUTOK = 5.5V0.1µA
ON2, MR, Input High Level2.6V ≤ VIN_ ≤ 5.5V1.6V
ON2, MR, Input Low Level2.6V ≤ VIN_ ≤ 5.5V0.4V
ON2, MR, PGM3, Input Leakage
CurrentVON2 = VMR = VPGM3 = GND, 5.5V-1+1µA
PGM3 Selection Threshold
REG3 target = 1.8V, IN = 2.6V to 5.5V0.4REG3 target = 2.5V, IN = 2.6V to 5.5V1.1REF1.4
REG3 target = 3.3V, IN = 2.6V to 5.5VVIN_ - 0.25
MAX1702BTriple Output Power Management IC for
Microprocessor-Based Systems
Electrical Characteristics (continued)
(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
MAX1702B toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
REG3 INCREMENTAL EFFICIENCY
vs. LOAD CURRENT
VOUT3 = 2.5V
VOUT3 = 3.3V
VOUT3 = 1.8V
NOTE: INCREMENTAL EFFICIENCY

IS REG3 OUTPUT POWER OVER
ADDITIONAL INPUT POWER.
REG1 AND REG3 QUIESCENT
CURRENT IS REFLECTED IN
REG1’S EFFICIENCY GRAPH.
MAX1702B toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
REG2 INCREMENTAL EFFICIENCY
vs. LOAD CURRENT
VOUT2 = 1V
VOUT2 = 1.3V
NOTE: INCREMENTAL EFFICIENCY
IS REG2 OUTPUT POWER OVER
ADDITIONAL INPUT POWER.
REG1 AND REG3 QUIESCENT
CURRENT IS REFLECTED IN
REG1’S EFFICIENCY GRAPH.
VOUT2 = 1.1V
MAX1702B toc04
SUPPLY VOLTAGE (V)
QUIESCENT CURRENT (mA)
NO LOAD QUIESECNT CURRENT
vs. SUPPLY VOLTAGE
MAX1702B toc05
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
REG1 DROPOUT VOLTAGE
vs. LOAD CURRENT (VIN = 3.3V)
MAX1702B toc06
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
REG3 DROPOUT VOLTAGE
vs. LOAD CURRENT (VIN = 3.3V)
VOUT3 = 3.3V
REG1 OUTPUT VOLTAGE
vs. LOAD CURRENT

MAX1702B toc07
OUTPUT VOLTAGE (V)
TA = +85°C
TA = -40°CTA = 0°C
TA = +40°C
MAX1702B toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
REG1 EFFICIENCY
vs. LOAD CURRENT
MAX1702B toc08
OUTPUT VOLTAGE (V)
REG2 OUTPUT VOLTAGE
vs. LOAD CURRENT
TA = -40°C
TA = +85°C
TA = 0°C
TA = +40°C
MAX1702B toc09
REG3 OUTPUT VOLTAGE
vs. LOAD CURRENT (VOUT3 = 3.3V)
OUTPUT VOLTAGE (V)TA = -40°C
TA = +85°C
TA = 0°CTA = +40°C
MAX1702BTriple Output Power Management IC for
Microprocessor-Based Systems
Typical Operating Characteristics
(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
MAX1702B toc10
LOAD CURRENT (mA)
REG3 OUTPUT VOLTAGE
vs. LOAD CURRENT (VOUT3 = 2.5V)
OUTPUT VOLTAGE (V)
TA = +85°C
TA = +40°C
TA = -40°CTA = 0°C
MAX1702B toc11
LOAD CURRENT (mA)
REG3 OUTPUT VOLTAGE
vs. LOAD CURRENT (VOUT3 = 1.8V)
OUTPUT VOLTAGE (V)
TA = +85°C
TA = +40°C
TA = -40°CTA = 0°C
MAX1702B toc12
SUPPLY VOLTAGE (V)
FREQUENCY (kHz)
INTERNAL OSCILLATOR FREQUENCY
vs. SUPPLY VOLTAGE
TA = -40°C
TA = +25°C
TA = +85°C
MAX1702B toc13
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)3510-15
INTERNAL REFERENCE
vs. TEMPERATURE
REG1 HEAVY-LOAD SWITCHING WAVEFORM
LOAD = 800mA, VIN = 4V
VOUT1
AC-COUPLED
20mV/div
IL1
500mA/div
MAX1702B toc14
VLX1
2V/div
I/O
CORE
REG2 HEAVY-LOAD SWITCHING WAVEFORM
LOAD = 400mA, VIN = 4V

VOUT2
AC-COUPLED
20mV/div
IL2
500mA/div
MAX1702B toc15
VLX2
2V/div
MAX1702BTriple Output Power Management IC for
Microprocessor-Based Systems
Typical Operating Characteristics (continued)
(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
REG3 HEAVY-LOAD SWITCHING WAVEFORM
LOAD = 700mA, VIN = 4V

400ns/div
VOUT3
AC-COUPLED
20mV/div
IL3
500mA/div
MAX1702B toc16
VLX3
2V/div
REG1 MEDIUM-LOAD SWITCHING WAVEFORM
LOAD = 100mA, VIN = 4V

400ns/div
VOUT1
AC-COUPLED
20mV/div
IL1
500mA/div
MAX1702B toc17
VLX1
2V/div
REG3 MEDIUM-LOAD SWITCHING WAVEFORM
LOAD = 100mA, VIN = 4V

2µs/div
VOUT3
AC-COUPLED
20mV/div
IL3
500mA/div
MAX1702B toc18
VLX3
2V/div
REG1 LIGHT-LOAD SWITCHING WAVEFORM
LOAD = 10mA, VIN = 4V

10µs/div
VOUT1
AC-COUPLED
20mV/div
IL1
500mA/div
MAX1702B toc19
VLX1
2V/div
REG2 LIGHT-LOAD SWITCHING WAVEFORM
LOAD = 10mA, VIN = 4V

VOUT2
AC-COUPLED
20mV/div
IL2
500mA/div
MAX1702B toc20
VLX2
2V/div
REG3 LIGHT-LOAD SWITCHING WAVEFORM
LOAD = 10mA, VIN = 4V

VOUT3
AC-COUPLED
20mV/div
IL3
500mA/div
MAX1702B toc21
VLX3
2V/div
MAX1702BTriple Output Power Management IC for
Microprocessor-Based Systems
(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
TURN-ON SEQUENCE
FROM POWER APPLICATION
ILOAD1 = 250mA, ILOAD2 = 100mA, ILOAD3 = 200mA

20ms/div
IIN
500mA/div
MAX1702B toc22
VOUT1
5V/div
VOUT3
5V/div
VOUT2
2V/div
VIN
5V/divVRSO
5V/div
TURN-OFF SEQUENCE
ILOAD1 = 250mA, ILOAD2 = 100mA, ILOAD3 = 200mA

200µs/div
IIN
500mA/div
MAX1702B toc23
VOUT1
5V/div
VOUT3
5V/div
VOUT2
2V/div
VIN
5V/div
VRSO
5V/div
TURN-ON DELAY
ILOAD1 = 250mA, ILOAD2 = 100mA, ILOAD3 = 200mA

40µs/div
IIN
200mA/div
MAX1702B toc24
VOUT2
1V/div
VON2
2V/div
REG1 LOAD TRANSIENT WAVEFORM
LOAD = 100mA TO 500mA, VIN = 4V

40µs/div
ILX1
500mA/div
ILOAD1
500mA/div
MAX1702B toc25
VOUT1
AC-COUPLED
200mV/div
MAX1702BTriple Output Power Management IC for
Microprocessor-Based Systems
Typical Operating Characteristics (continued)
(Circuit of Figure 1, TA = +25°C, unless otherwise noted.)
REG2 LOAD TRANSIENT WAVEFORM
LOAD = 20mA TO 200mA, VIN = 4V

40µs/div
ILX2
200mA/div
ILOAD2
100mA/div
MAX1702B toc26
VOUT2
AC-COUPLED
100mV/div
REG3 LOAD TRANSIENT WAVEFORM
LOAD = 75mA TO 400mA, VIN = 4V

40µs/div
ILX3
200mA/div
ILOAD3
200mA/div
MAX1702B toc27
VOUT3
AC-COUPLED
200mV/div
LINE TRANSIENT RESPONSE WAVEFORM
VIN = 4V TO 5V, ILOAD1 = 250mA,
ILOAD2 = 100mA, ILOAD3 = 200mA

400µs/div
MAX1702B toc28
VOUT1
AC-COUPLED
50mV/div
VOUT2
AC-COUPLED
50mV/div
VIN
2V/div
VOUT3
AC-COUPLED
20mV/div
ENTERING AND EXITING DROPOUT WAVEFORM
VIN = 2.75V TO 4V, ILOAD1 = 250mA,
ILOAD2 = 100mA, ILOAD3 = 200mA

20ms/div
MAX1702B toc29
VOUT1
AC-COUPLED
500mV/div
VOUT3
AC-COUPLED
500mV/div
VIN
AC-COUPLED
500mV/div
MAX1702BTriple Output Power Management IC for
Microprocessor-Based Systems
Typical Operating Characteristics (continued)
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