SC1650CS datasheet(4/4 Pages) SEMTECH

4 / 4 page

652 MITCHELL ROAD NEWBURY PARK CA 91320

HIGH-VOLTAGE INVERTING

DC-DC CONVERTER

SC1650

January 29, 1998

OUTLINE DRAWING - SO-8

PIN CONFIGURATION

PIN 1: V

4V to 24V input supply voltage.

PIN 2: V

REF

1.22V reference output. Bypass with a

0.047µF capacitor to GND. Sourcing

capability is guaranteed to be greater

than 250µA.

PIN 3: SHDN Logic input to shutdown the chip.

>1.5V = normal operation,

GND = shutdown

In shutdown mode DLOW and DHI

pins are high.

PIN 4: FB

Feedback signal input to comparator.

Connecting a resistance R1 to V

OUT

and a resistance R2 to V

REF yields the

output voltage:

PIN 5: GND

Power ground.

PIN 6: DLOW Driver sinking output. Connected to

DHI when using an external P-channel

MOSFET. When using an external

PNP bipolar transistor, connect a

resistor R

B from this pin to DHI. RB

value depends upon V

+, inductor value

and the PNP bipolar transistor. By

adjusting the R

B value, efficiency can

be optimized.

PIN 7: DHI

Driver sourcing output. Connect to

the gate of the external P-channel

MOSFET or base of the PNP bipolar

transistor.

PIN 8: CL

Current-limit input. This pin clamps the

switch peak current under abnormal

conditions.

REF

OUT

PIN DESCRIPTIONS

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