MAX1700 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – 1-Cell to 3-Cell, High-Power 1A, Low-Noise, Step-Up DC-DC Converters

19-4759; Rev 1; 1/99
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1-Cell to 3-Cell, High-Power (1A),
Low-Noise, Step-Up DC-DC Converters
General Description
The MAX1700/MAX1701 are high-efficiency, low-noise,
step-up DC-DC converters intended for use in battery-
powered wireless applications. They use a synchro-
nous-rectified pulse-width-modulation (PWM) boost
topology to generate 2.5V to 5.5V outputs from battery
inputs such as one to three NiCd/NiMH cells or one Li-
Ion cell. Both devices have an internal 1A, 130mΩ N-
channel MOSFET switch and a 250mΩ P-channel
synchronous rectifier.
With their internal synchronous rectifier, the MAX1700/
MAX1701 deliver 5% better efficiency than similar non-
synchronous converters. They also feature a pulse-
frequency-modulation (PFM) standby mode to improve
efficiency at light loads, and a 3µA shutdown mode.
The MAX1700/MAX1701 come in 16-pin QSOP pack-
ages (which occupy the same space as an 8-pin SO).
The MAX1701 includes two comparators to generate
power-good and low-battery warning outputs. It also
contains a gain block that can be used to build a linear
regulator using an external P-channel pass device.
For higher-power outputs, refer to the MAX1703. For
dual outputs (step-up and linear regulator), refer to the
MAX1705/MAX1706. For an on-board analog-to-digital
converter, refer to the MAX848/MAX849.
The MAX1701 evaluation kit is available to speed design
time.
Applications
Digital Cordless Phones Personal Communicators
PCS Phones
Palmtop Computers
Wireless Handsets
Hand-Held Instruments
Two-Way Pagers
Pin Configurations
TOP VIEW
I.C. 1
I.C. 2
REF 3
CLK/SEL 4
GND 5
I.C. 6
ONB 7
ONA 8
MAX1700
16 I.C.
15 POUT
14 OUT
13 LX
12 PGND
11 FB
10 I.C.
9 I.C.
QSOP
I.C. = INTERNAL CONNECTION. LEAVE OPEN OR CONNECT TO GND
Pin Configurations continued at end of data sheet.
Features
o Up to 96% Efficiency
o 1.1 V_IN Guaranteed Start-Up
o 0.7V to 5.5V Input Range
o Up to 800mA Output
o Step-Up Output (adjustable from 2.5V to 5.5V)
o PWM/PFM Synchronous-Rectified Topology
o External Clock or Internal 300kHz Oscillator
o 3µA Logic-Controlled Shutdown
o Power-Good Output (MAX1701)
o Low-Battery Comparator (MAX1701)
o Uncommitted Gain Block (MAX1701)
PART
MAX1700EEE
MAX1701EEE
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 QSOP
16 QSOP
Typical Operating Circuit
INPUT
0.7V TO 5.5V
ON
OFF
OFF
ON
PWM
OR
PFM
SYNC
MAX1700
ONA
LX
ONB
CLK/SEL _POUT
OUTPUT
3.3V OR ADJ
UP TO 800mA
REF
OUT
FB GND PGND
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