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MAX1702BEGX
Triple-Output Power-Management IC for Microprocessor-Based Systems
General DescriptionThe 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 man-
agement functions. Included is a step-down DC-DC con-
verter to supply 3.3V I/O and peripherals, a step-down
DC-DC converter to supply 0.7V to VINfor the micro-
processor 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.
ApplicationsPDA, Palmtop, and Wireless Handhelds
Third Generation Smart Cell Phones
Internet Appliances and Web Books
Automotive In-Dash Telematics Systems
FeaturesThree Regulators in One Package
Peripherals and I/O Supply: 3.3V at 900mA
µP Core Supply: 0.7V to VINat 400mA
Memory Supply: 1.8/2.5/3.3V at 800mASupports Intel PXA210 and PXA250
MicroprocessorsPower-On Reset with Manual Reset InputAuto Power-Up Sequencing1MHz PWM Switching Allows Small External
ComponentsLow 5µA Shutdown CurrentTiny 6mm ✕6mm, 36-Pin QFN Package
MAX1702B
Triple-Output Power-Management IC for
Microprocessor-Based Systems
Pin Configuration
Ordering Information19-2448; Rev 0; 4/02
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.
MAX1702B
Triple-Output Power-Management IC for
Microprocessor-Based Systems
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VINP1= VINP2= VINP3= VIN= 3.6V, VLBI = 1.1V, VDBI = 1.35V, MR= ON2 = IN, PGM3 = GND, circuit of Figure1, TA = -40°C to
+85°C unless otherwise noted. Typical values are at TA= +25°C.)
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.
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 Continuous 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
MAX1702B
Triple-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 Figure1, TA = -40°C to
+85°C unless otherwise noted. Typical values are at TA= +25°C.)
MAX1702B
Triple-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 Figure1, TA = -40°C to
MAX1702B
Triple-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 Figure1, 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:
where:
and:= N-channel synchronous rectifier RDSON= P-channel power switch RDSON= external inductor ESR
IOUT(MAX)= maximum required load current= operating frequency minimum
L = external inductor value
Note 3:Specified resistance is in series with an internal diode to LX2.
Note 4:Specifications to -40°C are guaranteed by design and not production tested.
