© 1997 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

LOW VOLTAGE STEP-UP

DC-DC CONVERTER

SC1633

January 29, 1998

Note:

(1) Add suffix ‘TR’ for tape and reel.

FEATURES

DESCRIPTION

The SC1633 is a high efficiency step up DC-DC

converter. Only four external components are required

to deliver a fixed voltage of 3V, 3.3V, or 5V. Efficiency

beyond 83% can be easily achieved at 70mA load with

2.2V to 3V input voltages.

A logic-controlled shutdown mode is provided for

power saving. Switch current limit can be programmed

with a resistor. The low battery detector can be

configured as a linear regulator or a burst mode

controller providing extremely low supply current

operation.

A switching rate of 120kHz reduces the inductor size -

inductors of 47µH to 150µH inductance are

recommended for most applications.

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

BLOCK DIAGRAM

APPLICATIONS

ORDERING INFORMATION

ABSOLUTE MAXIMUM RATINGS

Parameter

Symbol

Maximum

Units

Supply Voltage

V

IN

7.0

V

Operating

Temperature Range

T

A

0 to 70

°C

Storage

Temperature Range

T

STG

-65 to 125

°C

PIN CONFIGURATION

TYPICAL APPLICATION CIRCUIT

DEVICE

(1)

VOLTAGE

PACKAGE

SC1633CS

SC1633-3CS

SC1633-5CS

3.3V

3.0V

5.0V

SO-8