General Description

The MAX1760 is a high-efficiency, low-noise, step-up

DC-DC converter intended for use in battery-powered

wireless applications. It maintains exceptionally low qui-

escent supply current (100µA) despite its high 1MHz

operating frequency. Small external components and a

tiny 10-pin µMAX package make this device an excel-

lent choice for small hand-held applications requiring

the longest possible battery life.

The MAX1760 uses a synchronous-rectified pulse-

width-modulation (PWM) boost topology to generate

2.5V to 5.5V outputs from a wide range of input

sources, such as 1 to 3 alkaline or NiCd/NiMH cells or a

single lithium-ion (Li+) cell. Maxim's proprietary Idle-

Mode™ circuitry significantly improves efficiency at

light load currents while smoothly transitioning to fixed-

frequency PWM operation at higher load currents to

maintain excellent full-load efficiency.

Low-noise, forced PWM mode is available for applica-

tions requiring constant-frequency operation at all load

currents. The MAX1760 may also be synchronized to

an external clock to protect sensitive frequency bands

in communications equipment. Analog soft-start and

adjustable current limit permit optimization of efficiency,

external component size, and output voltage ripple.

Applications

Digital Cordless Phones

PCS Phones

Wireless Handsets

Hand-Held Instruments

Palmtop Computers

Personal Communicators

Two-Way Pagers

Features

o Up to 94% Efficiency

o 0.7V to 5.5V Input Range

o Up to 800mA Output

o Fixed 3.3V Output (or adj from 2.5V to 5.5V)

o PWM Synchronous Rectified Topology

o Low-Noise, Constant Frequency Operation (1MHz)

o 0.1µA Logic-Controlled Shutdown

o Synchronizable Switching Frequency

o Adjustable Current Limit

o Adjustable Soft-Start

o 10-Pin µMAX Package

0.8A, Low-Noise, 1MHz,

Step-Up DC-DC Converter

________________________________________________________________ Maxim Integrated Products

1

1

2

3

4

5

10

9

8

7

6

POUT

LX

PGND

FB

GND

REF

ISET

MAX1760

µMAX

TOP VIEW

CLK/SEL

OUT

ON

PGND

FB

GND

POUT

LX

ISET

OUT

REF

CLK/SEL

INPUT = 0.7V

800mA

ON

MAX1760

Typical Operating Circuit

19-1660; Rev 1; 1/01

PART

MAX1760EUB

-40°C to +85°C

TEMP. RANGE

PIN-PACKAGE

10 µMAX

EVALUATION

KIT

AVAILABLE

Idle Mode is a trademark of Maxim Integrated Products.

Pin Configuration

Ordering Information

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.