19-4759; Rev 1; 1/99
NUAL
KIT MA
ATION
ET
EVALU
TA SHE
WS DA
FOLLO
1-Cell to 3-Cell, High-Power (1A),
Low-Noise, Step-Up DC-DC Converters
General Description
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)
MAX1700/MAX1701
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.
Ordering Information
PART
MAX1700EEE
MAX1701EEE
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 QSOP
16 QSOP
Applications
Digital Cordless Phones
PCS Phones
Wireless Handsets
Two-Way Pagers
TOP VIEW
I.C. 1
I.C. 2
REF 3
CLK/SEL 4
GND 5
I.C. 6
ONB 7
ONA 8
16 I.C.
15 POUT
14 OUT
Typical Operating Circuit
INPUT
0.7V TO 5.5V
Personal Communicators
Palmtop Computers
Hand-Held Instruments
Pin Configurations
ON
OFF
OFF
ON
PWM
PFM
OR
ONB
CLK/SEL
POUT
MAX1700
ONA
LX
OUTPUT
3.3V OR ADJ
UP TO 800mA
SYNC
MAX1700
13 LX
12 PGND
11 FB
10 I.C.
9
I.C.
REF
FB
OUT
GND PGND
QSOP
I.C. = INTERNAL CONNECTION. LEAVE OPEN OR CONNECT TO GND
Pin Configurations continued at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
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.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
