SP6650 datasheet(4/17 Pages) SIPEX

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Date: 5/25/04

SP6650 High Efficiency 600mA Synchronous Buck Regulator

PIN DESCRIPTION

PIN NUMBER

PIN NAME

DESCRIPTION

1PV

Input voltage power pin. Inductor charging current passes

through this pin.

Internal supply voltage. Control circuitry powered from this

pin.

BLON

Open drain battery low output. V

IN below battery low thresh-

old pulls this node to ground. V

IN above threshold, this node

is open.

LIM

Inductor current limit programming pin. Tie pin to V

IN for

0.95A peak inductor current limit. Tie pin to ground for 0.5A

peak inductor current limit. TTL input threshold.

SHDN

Shutdown control input. Tie to V

IN for normal operation, tie to

ground for shutdown. TTL input threshold.

6FB

External feedback network input connection. Connect a

resistor from FB to ground and FB to V

OUT to control the

output voltage externally. This pin regulates to the internal

bandgap reference voltage of 1.25V. Tie FB to ground to use

the internal divider for a preset output voltage of 3.3V.

OUT

Output voltage sense pin. Used for internal feedback divider

and timing circuit.

GND

Internal ground pin. Control circuitry returns current to this

pin.

PGND

Power ground pin. Synchronous rectifier current returns

through this pin.

Inductor switching node. Inductor tied between this pin and

the output capacitor to create regulated output voltage.

SP6650 Datasheet(PDF) 4 Page - Sipex Corporation

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