MAX1703 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – 1-Cell to 3-Cell, High-Power 1.5A, Low-Noise, Step-Up DC-DC Converter

19-1336; Rev 2; 11/98
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1-Cell to 3-Cell, High-Power (1.5A),
Low-Noise, Step-Up DC-DC Converter
________________General Description
The MAX1703 is a high-efficiency, low-noise, step-up
DC-DC converter intended for use in battery-powered
wireless applications. It uses a synchronous-rectified
pulse-width-modulation (PWM) boost topology to gen-
erate a 2.5V to 5.5V output from battery inputs, such as
one to three NiCd/NiMH cells or one Li-Ion cell. The
device includes a 2A, 75mΩ, N-channel MOSFET
switch and a 140mΩ, P-channel synchronous rectifier.
With its internal synchronous rectifier, the MAX1703
delivers up to 5% better efficiency than similar nonsyn-
chronous converters. It also features a pulse-frequency-
modulation (PFM) low-power mode to improve efficiency
at light loads, and a 1µA shutdown mode.
The MAX1703 comes in a 16-pin narrow SO package
and includes an uncommitted comparator that generates
a power-good or low-battery-warning output. It also
contains a linear gain block that can be used to build a
linear regulator.
For lower-power outputs and a smaller package, refer
to the MAX1700/MAX1701. For dual outputs (step-up
plus linear regulator), refer to the MAX1705/MAX1706.
For an on-board analog-to-digital converter, refer to the
MAX848/MAX849.
The MAX1703 evaluation kit is available to speed designs.
____________________________Features
o Up to 95% Efficiency
o Up to 1.5A Output
o Fixed 5V or Adjustable Step-Up Output
(2.5V to 5.5V)
o 0.7V to 5.5V Input Range
o Low-Power Mode (300µW)
o Low-Noise, Constant-Frequency Mode (300kHz)
o Synchronizable Switching Frequency
(200kHz to 400kHz)
o 1µA Logic-Controlled Shutdown
o Power-Good Comparator
o Uncommitted Gain Block
PART
MAX1703ESE
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
16 Narrow SO
________________________Applications
Digital Cordless Phones Personal Communicators
PCS Phones
Palmtop Computers
Wireless Handsets
Two-Way Pagers
Hand-Held Instruments
Typical Operating Circuit
Pin Configuration
INPUT
0.7V TO 5.5V
OFF
ON
PWM
OR
SYNC
PFM
POWER-GOOD
INPUT
GAIN-BLOCK INPUT
MAX1703
LXP, LXN
ON
POUT
CLK/
SEL
OUT
POKIN
AIN
POK
REF
AO
FB GND PGND
OUTPUT
5V OR ADJ
UP TO 1.5A
POWER-GOOD
OUTPUT
GAIN-BLOCK
OUTPUT
TOP VIEW
REF 1
FB 2
POKIN 3
OUT 4
GND 5
AIN 6
AO 7
POK 8
MAX1703
16 ON
15 POUT
14 LXP
13 POUT
12 PGND
11 LXN
10 PGND
9 CLK/SEL
Narrow SO
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