Rev. 3/23/01

SP6650 Evaluation Board Manual

© Copyright 2001 Sipex Corporation

5

PIN DESCRIPTION

PIN NUMBER

PIN NAME

DESCRIPTION

1PV

IN

Input voltage power pin. Inductor charging current passes

through this pin.

2V

IN

Internal supply voltage. Control circuitry powered from this

pin.

3

BLON

Open drain battery low output. V

old pulls this node to ground. V

is open.

4I

LIM

Inductor current limit programming pin. Tie pin to V

peak inductor current limit. Tie pin to ground for 0.4A peak

inductor current limit. TTL input threshold.

5

SHDN

Shutdown control input. Tie to V

ground for shutdown. TTL input threshold.

6

FB

External feedback network input connection. Connect a

resistor from FB to ground and FB to V

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.

7V

OUT

Output voltage sense pin. Used for internal feedback divider

and timing circuit.

8

GND

Internal ground pin. Control circuitry returns current to this

pin.

9

PGND

Power ground pin. Synchronous rectifier current returns

through this pin.

10

LX

Inductor switching node. Inductor tied between this pin and

the output capacitor to create regulated output voltage.