www.semtech.com

1

POWER MANAGEMENT

SC1462

High Output Current

Charge Pump Doubler

December 12, 2005

Description

Features

Typical Application Circuit

Typical Application Circuit

Applications

Features

The SC1462 is a versatile charge pump designed for use

in battery operated power supply applications over the

wide input range of 1.65 to 5.5 volts. A simple, low qui-

escent current charge pump doubler can be implemented

without costly inductors or capacitors. Internal MOSFETs

and control circuitry eliminate the need for costly board

space and design time. The small 6 lead SOT-23 package

helps minimize board space.

The SC1462 charge pump can be used for applications

that require up to 80mA of output current with V

to 5.5V. Typical dropout voltage (2×V

low for several values of V

Input supply voltage range of 1.65V to 5.5V

Small size - 6 pin SOT-23 package

Typical efficiency of :

91% @ V

94% @ V

Short circuit and over-temperature protection

140μA typical input current @ no load

Shutdown current <1μA

Designed to work with ceramic or tantalum

capacitors

Fixed frequency of 160kHz

All specifications rated over full temperature range

(-40°C to 85°C)

Cellular phones

Handheld devices

LCD Display

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

000E+0

20E-3

40E-3

60E-3

80E-3

100E-3

SC1462

Logic Control or GND

VIN

SHDN

VOUT

C+

C-

GND

3.3μF

3.3μF

1

2

3

45

6

3.3μF