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1

2

3

4

8

7

6

5

OUT

CXP

CXN

PGND

GND

IN

SHDN

AOUT

MAX1595

µMAX

TOP VIEW

OUTPUT

OUT

IN

INPUT

SHDN

GND

CXN

CXP

PGND

AOUT

MAX1595

Regulated 3.3V/5.0V Step-Up/Step-Down

Charge Pump

Maxim Integrated Products

1

Typical Operating Circuit

19-2107; Rev 1; 8/02

General Description

The MAX1595 charge-pump regulator generates either

3.3V or 5V from a 1.8V to 5.5V input. The unique control

architecture allows the regulator to step up or step

down the input voltage to maintain output regulation.

The 1MHz switching frequency, combined with a

unique control scheme, allows the use of a ceramic

capacitor as small as 1µF for 125mA of output current.

The complete regulator requires three external capaci-

tors—no inductor is needed. The MAX1595 is specifi-

cally designed to serve as a high-power, high-

efficiency auxiliary supply in applications that demand

a compact design. The MAX1595 is offered in space-

saving 8-pin µMAX and high-power 12-pin thin QFN

packages.

Applications

White LED Power

Flash Memory Supplies

Battery-Powered Applications

Miniature Equipment

PCMCIA Cards

3.3V to 5V Local Conversion Applications

Backup-Battery Boost Converters

3V to 5V GSM SIMM Cards

Features

o Ultra-Small: Requires Only Three Ceramic

Capacitors

o No Inductors Required

o Up to 125mA Output Current

o Regulated ±3% Output Voltage

o 1MHz Switching Frequency

o 1.8V to 5.5V Input Voltage

o 220µA Quiescent Current

o 0.1µA Shutdown Current

o Load Disconnect in Shutdown

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX1595EUA33

-40°C to +85°C

8 µMAX

MAX1595ETC33

-40°C to +85°C

12 Thin QFN

MAX1595EUA50

-40°C to +85°C

8 µMAX

MAX1595ETC50

-40°C to +85°C

12 Thin QFN

Pin Configurations continued at end of data sheet.

Selector Guide

PART

TOP MARK

MAX1595EUA33

3.3V

—

MAX1595ETC33

3.3V

AAAP

MAX1595EUA50

5.0V

—

MAX1595ETC50

5.0V

AAAM

*Contact factory for other fixed-output voltages from 2.7V to 5.0V.

Pin Configurations