General Description

The MAX1852/MAX1853 monolithic, CMOS charge-

pump voltage inverters in the ultra-small SC70 package

feature a low 15

Ω output resistance, permitting loads

up to 30mA with maximum efficiency. The MAX1852/

MAX1853 are available with operating frequencies of

50kHz and 200kHz, respectively, allowing optimization

of supply current or external component size. Small

external components and micropower shutdown mode

make these devices ideal for both battery-powered and

board-level voltage conversion applications.

Oscillator control circuitry and four power-MOSFET

switches are included on-chip. Applications include

generating a negative supply from a +5V or +3.3V logic

supply to power analog circuitry. Both versions come in

a 6-pin SC70 package that is 40% smaller than a

SOT23.

Applications

Negative Supply from +5V or +3.3V Logic Supplies

Small LCD Panels

GaAsFET Bias Supplies

Handy-Terminals, PDAs

Battery-Operated Equipment

Features

o 30mA Output Current

o Low 15Ω Output Resistance

o 68µA Supply Current (MAX1852)

o Requires Only Two 0.68µF Capacitors (MAX1853)

o +2.5V to +5.5V Input Voltage Range

o 0.1µA Logic-Controlled Shutdown

o Two Switching Frequencies

50kHz (MAX1852)

200kHz (MAX1853)

o Slew-Rate Limited to Reduce EMI

o Ultra-Small 6-Pin SC70 Package

SC70 Inverting Charge Pumps

with Shutdown

________________________________________________________________ Maxim Integrated Products

1

5

TOP VIEW

GND

C1-

IN

C1+

OUT

SC70-6

1

6

MAX1852

MAX1853

2

3

4

SHDN

Pin Configuration

C1+

C1-

IN

SHDN

OUT

GND

ON

0.68

µF

0.68

µF

OFF

INPUT

2.5V TO 5.5V

NEGATIVE

OUTPUT

30mA

MAX1853

Typical Operating Circuit

19-1792; Rev 0; 9/00

Ordering Information

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

PART

TEMP.

RANGE

PIN-

PACKAGE

TOP

MARK

MAX1852EXT

-40

°C to +85°C

6 SC70

AAL

MAX1853EXT

-40

°C to +85°C

6 SC70

AAM