SP6650 Datasheet, PDF (4/17 Pages) Sipex Corporation – High Efficiency 600mA Synchronous Buck Regulator Ideal for portable designs powered with Li Ion battery

PIN DESCRIPTION
PIN NUMBER PIN NAME
1
PV_IN
2
V_IN
3
BLON
4
I
LIM
5
SHDN
6
FB
7
V_OUT
8
GND
9
PGND
10
LX
DESCRIPTION
Input voltage power pin. Inductor charging current passes
through this pin.
Internal supply voltage. Control circuitry powered from this
pin.
Open drain battery low output. V_IN below battery low thresh-
old pulls this node to ground. V above threshold, this node
IN
is open.
Inductor current limit programming pin. Tie pin to V for
IN
0.95A peak inductor current limit. Tie pin to ground for 0.5A
peak inductor current limit. TTL input threshold.
Shutdown control input. Tie to V_IN for normal operation, tie to
ground for shutdown. TTL input threshold.
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.
Output voltage sense pin. Used for internal feedback divider
and timing circuit.
Internal ground pin. Control circuitry returns current to this
pin.
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.
Date: 5/25/04
SP6650 High Efficiency 600mA Synchronous Buck Regulator
4
© Copyright 2004 Sipex Corporation