General Description

The MAX1763 is a high-efficiency, low-noise, step-up

DC-DC converter intended for use in battery-powered

wireless applications. This device maintains exception-

ally low quiescent supply current (110µA) despite its

high 1MHz operating frequency. Small external compo-

nents and a tiny package make this device an excellent

choice for small hand-held applications that require the

longest possible battery life.

The MAX1763 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 one to three alkaline or NiCd/NiMH

cells or a single Lithium-ion (Li+) cell. Maxim's propri-

etary Idle Mode™ circuitry significantly improves effi-

ciency at light load currents while smoothly transitioning

to fixed-frequency PWM operation at higher load cur-

rents to maintain excellent full-load efficiency. Low-

noise, forced-PWM mode is available for applications

that require constant-frequency operation at all load

currents. The MAX1763 may also be synchronized to

an external clock to protect sensitive frequency bands

in communications equipment.

The MAX1763 includes an on-chip linear gain block

that can be used to build a high-power external linear

regulator or as a low-battery comparator. Soft-start and

current limit functions permit optimization of efficiency,

external component size, and output voltage ripple.

The MAX1763 is available in a space-saving 16-pin

QSOP package or a high-power (1.5W) 16-pin TSSOP-

EP package.

Features

♦ Up to 94% Efficiency

♦ +0.7V to +5.5V Input Voltage Range

♦ 1.1V Guaranteed Startup Input Voltage

♦ Up to 1.5A Output

♦ Fixed 3.3V Output or Adjustable (2.5V to 5.5V)

♦ 1MHz PWM Synchronous-Rectified Topology

♦ 1µA Logic-Controlled Shutdown

♦ Analog Gain Block for Linear-Regulator or Low-

Battery Comparator

♦ Adjustable Current Limit and Soft-Start

♦ 1.5W TSSOP Package Available

1.5A, Low-Noise, 1MHz, Step-Up

DC-DC Converter

________________________________________________________________ Maxim Integrated Products

1

Pin Configuration

19-1698; Rev 2; 4/11

Ordering Information

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad

Idle Mode is a trademark of Maxim Integrated Products.

PART

TEMP RANGE

PIN-PACKAGE

MAX1763EEE+

-40°C to +85°C

16 QSOP

MAX1763EUE+

-40°C to +85°C

16 TSSOP-EP*

Digital Cordless

Phones

PCS Phones

Wireless Handsets

Hand-Held

Instruments

Palmtop Computers

Personal

Communicators

Typical Operating Circuit

ON

OFF

PWM

OFF

ON

ONB

ONA

LX

POUT

OUT

CLK/SEL

AO

GND

PGND

FB

ISET

REF

MAX1763

OR NORMAL

AIN

LBI OR GAIN

BLOCK INPUT

1.5

μH

IN

0.7V TO 5.5V

LBO OR

GAIN BLOCK OUTPUT

OUT

3.3V AT 1.5A

________________________Applications

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

ONA

ONB

POUT

LX

POUT

PGND

LX

PGND

CLK/SEL

TOP VIEW

MAX1763

QSOP

TSSOP-EP

ISET

REF

OUT

GND

FB

AIN

AO

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

EVALUATION

KIT

AVAILABLE