SC1633-3CS datasheet(7/7 Pages) SEMTECH

7 / 7 page

652 MITCHELL ROAD NEWBURY PARK CA 91320

LOW VOLTAGE STEP-UP

DC-DC CONVERTER

SC1633

January 29, 1998

DEVICE OUTLINE - SO-8

PIN DESCRIPTIONS

PIN 1: I

LIM/SD

(1) Connected to V

IN pin through a

resistor to set the switch peak current.

It serves to protect the IC and induc-

tor, as well as to improve efficiency

and output ripple. However, the supply

capability of the SC1633 is limited by

the current limit resistor (see typical

performance characteristics). The

LIM/SD pin should be shorted to VIN if

limiting switch peak current is not

required.

(2) The SC1633 goes into shutdown

mode and consumes less than 10µA

when the I

LIM/SD pin is pulled to

ground.

PIN 2: V

Input supply.

PIN 3: SW

Drain of the power switch, to be con-

nected to the inductor and diode.

PIN 4: SGND Ground connected to the source of the

power switch.

PIN 5: CGND Ground for control circuits of the IC. It

should be separated from SGND to

avoid interference.

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 the LBI pin is below

1.22 volts.

PIN 7: LBI

The inverting input of the battery low

detector, of which the non-inverting

input is internally connected to the

1.22V voltage reference.

PIN 8: V

OUT

The output voltage feeds back to the

IC through this pin.

PIN CONFIGURATION

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