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SC1628

HIGH-EFFICIENCY STEP-UP DC-DC CONVERTER

Semtech Corporation 

January 30, 1998

DEVICE OUTLINE - SO-8

HIGH-EFFICIENCY STEP-UP

DC-DC CONVERTER

SC1628

PIN DESCRIPTIONS

PIN 1: VIN 4V to 24V 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 Logical input to shutdown the chip:

>1.5V = normal operation,

GND = shutdown.

Cannot be floating or forced greater

than 15V. In shutdown mode DLOW

and DHI pins are low.

PIN 4: FB

Feedback signal input to comparator.

Connecting a resistance R1 to VOUT

and a resistance R2 to GND yields

the output voltage:

VOUT

=

R1+ R2

R2

×

VREF

(refer to typical application circuit).

PIN 5: GND Power ground.

PIN 6:

DLOW

Driver sinking output. Connected to

the gate of the external N-channel

MOSFET or the base of the NPN

bipolar transistor.

PIN 7: DHI

PIN 8: CL

Driver sourcing output. Connected to

DLOW when using an external N-

channel MOSFET. When using an

external NPN bipolar transistor,

connect a base resistance RB from

this pin to DLOW. RB value depends

upon VIN, the inductor value and the

NPN current gain.

Current-limit input. The threshold

voltage is 60mV from VIN. This pin

clamps the switch peak current under

abnormal conditions.

PIN CONFIGURATION

© 1997 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

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