3

Date:5/25/04

SP6652 1A, High Efficiency, High Frequency Current Mode PWM Buck Regulator

© Copyright 2004 Sipex Corporation

PIN DESCRIPTION

PIN NUMBER

PIN NAME

DESCRIPTION

Power Ground Pin. Synchronous rectifier current returns through this pin.

Internal Ground Pin. Control circuitry returns current to this pin.

3FB

External feedback network input connection. Connect a resistor from

to ground and from FB to output voltage to control the output voltage.

Regulation point at FB=0.75V Typical.

4

COMP

Compensation pin for error loop. Connect an R and C in series to

ground to control open loop pole and zero.

5

SD\

Shutdown control input. Tie pin to VIN for normal operation, tie to

ground for shutdown. TTL input threshold.

6

MODE

Connect this pin to VIN to force PWM operation and to S

automatic PWM/PFM selection, for a better light load efficiency.

7

SYNC

An external clock signal can be connected to this to synchronize the

switching frequency. The part runs in PWM mode in the precence of a

sync clock.

Internal supply voltage. Control circuitry is powered from from this pin.

Use an RC filter close to the pin to cut down supply noise.

Supply voltage for the output driver stage. Inductor charging current

passes through this pin.

10

LX

Inductor switching node. Inductor tied between this pin and the output

capacitor to create regulated output voltage.