SC1630 datasheet(8/8 Pages) SEMTECH

8 / 8 page

652 MITCHELL ROAD NEWBURY PARK CA 91320

LOW VOLTAGE MULTI-MODE

DC-DC CONVERTER

SC1630

January 30, 1998

DEVICE OUTLINE - SO-8

PIN DESCRIPTIONS

PIN 1: SD

The SC1630 goes into shutdown

mode and consumes less than 10µA

when the SD pin is pulled to ground,

and it goes into normal operating

mode when the SD pin is pulled to a

positive voltage above 100mV.

PIN 2: V

Input supply.

PIN 3: EXT

Push-Pull driver output to drive exter-

nal power switch.

PIN 4: GND

Ground.

PIN 5: FB

The output voltage can either be inter-

nally set to 5 volts by grounding the FB

pin, or it can be externally set to an

arbitrary voltage by applying to the FB

pin the divider voltage of two external

divider resistors. V

OUT voltage is given

by the following equation:

Where:

R1= Resistor connected beween FB

Pin and V

OUT pin.

R2= Resistor connected between FB

Pin and ground.

OUT = Output voltage to be set.

PIN 6: LBO

Open drain output of the battery low

detector, with 45 Ohm “On Resis

tance” at V

IN=2V. It is pulled low when

the voltage on LBI pin is below 1.22

volts.

PIN 7: LBI

The inverting input of the battery low

detector, of which the non-inverting in-

put is internally connected to the 1.22V

voltage reference.

PIN 8: V

OUT

The output voltage feeds back to the

IC through this pin for internally set 5V

operation. If the output voltage is

externally set, the V

OUT pin can be tied

to any low impedance node with volt-

age between the external power

switch threshold and 7 volts.









OUT

611

PIN CONFIGURATION

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