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SC1650

HIGH-VOLTAGE INVERTING DC-DC CONVERTER

Semtech Corporation 

HIGH-VOLTAGE INVERTING

DC-DC CONVERTER

SC1650

January 29, 1998

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

DESCRIPTION

The SC1650 is a high performance inverting DC-DC

converter, designed to drive an external power switch

to generate programmable negative voltages. In the

particularly suitable LCD bias contrast application,

maximum efficiency of 90% can be achieved with low

cost PNP bipolar transistor drivers. The 4V to 24V

input operation range allows the SC1650 to be

powered directly by the battery pack in most battery-

operated applications for greater efficiency. The output

voltage can be scaled to -40V by two external

resistors. A pulse frequency modulation scheme is

employed to maintain high efficiency conversion under

wide input voltage ranges. Quiescent current is about

100µA and can be reduced to 8µA in shutdown mode.

With a switching frequency range of 100kHz to

320kHz, small size switching components may be

used, which is ideal for battery powered portable

equipment such as notebook and palmtop computers.

BLOCK DIAGRAM

FEATURES

• 4V to 24V input voltage operation

• Adjustable output voltage up to -40V

• Low quiescent current at 100µA

• Pulse frequency modulation maintains high

efficiency (max 90%)

• 100kHz to 320kHz switching frequency

• Power-Saving shutdown mode (8µA typical)

• High efficiency with low cost external PNP bipolar

transistor

APPLICATIONS

• Negative LCD contrast bias for

1. Notebook & palmtop computers

2. Pen-based data systems

3. Portable data collection terminals

4. Personal digital assistants

• Negative voltage supplies

ORDERING INFORMATION

DEVICE(1)

SC1650CS

VOUT

Adj

Note:

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

PACKAGE

SO-8

PIN CONFIGURATION

ABSOLUTE MAXIMUM RATINGS

Parameter

Supply Voltage

SHDN Voltage

Operating

Temperature

Range

Storage

Temperature

Range

Symbol

V+

VSHDN

TA

Maximum

24

15

0 to 70

Units

V

V

°C

TSTG

-65 to 125

°C

© 1997 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

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