MAX1703 Maxim, MAX1703 Datasheet
MAX1703
Manufacturer Part Number
MAX1703
Description
1-Cell to 3-Cell / High-Power 1.5A / Low-Noise / Step-Up DC-DC Converter
Manufacturer
Maxim
Datasheet
1.MAX1703.pdf
(16 pages)
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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.
19-1336; Rev 2; 11/98
________________General Description
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
PWM
0.7V TO 5.5V
GAIN-BLOCK INPUT
INPUT
OR
PFM
OFF
POWER-GOOD
SYNC
INPUT
Typical Operating Circuit
ON
________________________________________________________________ Maxim Integrated Products
ON
CLK/
SEL
POKIN
AIN
REF
FB
MAX1703
Low-Noise, Step-Up DC-DC Converter
GND
LXP, LXN
PGND
POUT
POK
OUT
1-Cell to 3-Cell, High-Power (1.5A),
AO
UP TO 1.5A
5V OR ADJ
OUTPUT
POWER-GOOD
OUTPUT
GAIN-BLOCK
OUTPUT
____________________________Features
________________________Applications
MAX1703ESE
Up to 95% Efficiency
Up to 1.5A Output
Fixed 5V or Adjustable Step-Up Output
(2.5V to 5.5V)
0.7V to 5.5V Input Range
Low-Power Mode (300µW)
Low-Noise, Constant-Frequency Mode (300kHz)
Synchronizable Switching Frequency
(200kHz to 400kHz)
1µA Logic-Controlled Shutdown
Power-Good Comparator
Uncommitted Gain Block
Digital Cordless Phones
PCS Phones
Wireless Handsets
Two-Way Pagers
TOP VIEW
PART
POKIN
GND
OUT
POK
REF
AIN
AO
FB
1
2
3
4
5
6
7
8
TEMP. RANGE
-40°C to +85°C
Ordering Information
Narrow SO
MAX1703
Pin Configuration
Personal Communicators
Palmtop Computers
Hand-Held Instruments
16
15
14
13
12
11
10
9
ON
POUT
LXP
POUT
PGND
LXN
PGND
CLK/SEL
PIN-PACKAGE
16 Narrow SO
1
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