SC194BEVB datasheet(5/17 Pages) SEMTECH

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SC194B

POWER MANAGEMENT

Pin Descriptions

Pin #

Pin Name

Pin Function

VIN

Input power supply voltage

MODE

MODE select pin where MODE = V

IN to select 100% duty cycle function and MODE = GND to

disable

SYNC/PWM

Oscillator synchronization input

— Tie to V

IN for forced PWM mode or GND to allow the part to

enter PSAVE mode at light loads. Apply an external clock signal for frequency synchronization.

4EN

Enable digital input

— A high input enables the SC194B, a low disables and reduces quiescent

current to less than 1μA. In shutdown, LX becomes high impedance.

VOUT

Regulated output voltage and feedback for SC194B

VID0

Logic level bit 0 is used in conjunction with VID1 to set the output voltage. Connect high or low

as required to select the desired output voltage. If not connected, the output voltage will be

indeterminate.

VID1

Logic level bit 1 is used in conjunction with VID0 to set the output voltage. Connect high or low

as required to select the desired output voltage. If not connected, the output voltage will be

indeterminate.

GND

Ground

PGND

Power Ground

Inductor connection to the switching FETs

THERMAL

PAD

Pad is for heatsinking purposes

— not connected internally. Connect exposed pad to ground

plane using multiple vias.

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