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SC1652CS

MICROPOWER INVERTING DC-DC CONVERTER

Semtech Corporation 

January 29, 1998

OUTLINE DRAWING SO-8

MICROPOWER INVERTING

DC-DC CONVERTER

SC1652

PIN CONFIGURATION

PIN DESCRIPTIONS

PIN 1: V+

2.4V to 7V input supply voltage.

PIN 2: VREF

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 VOUT

and a resistance R2 to VREF yields the

output voltage:

VOUT

=

-

R1

R2

×

VREF

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 RB from this pin to DHI. RB

value depends upon V+, inductor value

and the PNP bipolar transistor. By

adjusting the RB 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.

© 1997 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

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