© 2000 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

60mA PROGRAMMABLE FIXED

FREQUENCY CHARGE PUMP DOUBLER

SC1464

PRELIMINARY - August 11, 2000

1

TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com

DESCRIPTION

The SC1464 is a versatile charge pump designed for

use in battery operated power supply applications. A

simple, low current charge pump doubler can be imple-

mented without costly inductors or capacitors. Internal

MOSFET’s and control circuitry eliminate the need for

costly board space and design time. The small device

footprint allows for compact circuit design.

The SC1464 charge pump can be used for applications

that require up to 60mA of output current with V

2.85V and V

The small 8 lead MSOP-8

package helps minimize board space.

The TF1 and TF2 pins provide binary control of the

oscillator frequency to either 1 MHz, 260kHz, 32kHz or

8kHz. The user can change the frequency during oper-

ation with extremely fast settling time.

FEATURES

capacitors

range (-40°C to 85 °C)

APPLICATIONS

ORDERING INFORMATION

Part Number

(1)

Package

SC1464CMS.TR

MSOP-8

Note:

(1) Only available in tape and reel packaging. A reel

contains 2500 devices.

APPLICATION CIRCUIT

CBucket

Logic Input or Vin

TF1

Iout

Freq

60mA

260kHz

U1

SC1464

3

7

5

6

4

1

2

Vo

Vin

C+

C-

EN

TF1

TF2

Vo =5.2 V to 6.2 V

Cout

3.3uF

3.3uF

2.2uF

1.0uF

1.0uF

0.22uF

20mA

260kHz

60mA

1MHz

Vin =3 V +/- 5%

0.22uF

0.22uF

0.10uF

20mA

1MHz

1.0uF

1.0uF

0.22uF

TF2

Cin

Cin

Cout

CBucket