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General Description

The MAX682/MAX683/MAX684 charge-pump regula-

tors generate 5V from a 2.7V to 5.5V input. They are

specifically designed to serve as high-efficiency auxil-

iary supplies in applications that demand a compact

design. The MAX682, MAX683, and MAX684 deliver

250mA, 100mA, and 50mA output current, respectively.

These complete 5V regulators require only one resistor

and three external capacitors—no inductors are need-

ed. High switching frequencies (externally adjustable

up to 2MHz) and a unique regulation scheme allow the

use of capacitors as small as 1µF per 100mA of output

current. The MAX683/MAX684 are offered in a space-

saving 8-pin µMAX package that is only 1.1mm high,

while the MAX682 is available in an 8-pin SO.

Applications

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: 1µF Capacitors per 100mA of Output

Current

o No Inductors Required

o 1.1mm Height in µMAX Package (MAX683/MAX684)

o Up to 250mA Output Current (MAX682)

o Regulated ±4% Output Voltage

o 50kHz to 2MHz Adjustable Switching Frequency

o 2.7V to 5.5V Input Voltage

o 100µA Quiescent Current in Pulse-Skipping Mode

o 0.1µA Shutdown Current

3.3V-Input to Regulated 5V-Output

Charge Pumps

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Maxim Integrated Products

1

CXN

PGND

GND

1

2

8

7

OUT

CXP

SHDN

IN

SKIP

SO

TOP VIEW

3

4

6

5

MAX682

CXN

PGND

GND

1

2

8

7

OUT

CXP

SHDN

IN

SKIP

µMAX

3

4

6

5

MAX683

MAX684

Pin Configurations

OUTPUT

5V/250mA

OUT

SHDN

IN

INPUT

2.7V TO 5.5V

SKIP

GND

PGND

CXN

CXP

MAX682

Typical Operating Circuit

19-0177; Rev 1; 8/98

PART

MAX682ESA

MAX683EUA

MAX684EUA

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE

PIN-PACKAGE

8 SO

8 µMAX

8 µMAX

Ordering Information