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Negative Voltage Power Supply
DESCRIPTION
The SP34063A is a monolithic switching regulator control circuit containing the primary
functions required for DC-DC converters. This device consists of an internal temperature
compensated reference, voltage comparator, controlled duty cycle oscillator with active
current limit circuit, driver and high current output switch. This device was specifically
designed to be used in buck, boost, and Voltage-Inverting applications with a minimum
number of external components. The SP34063A is available in 8 pin NSOIC package.
TYPICAL APPLICATION CIRCUIT
L1 150碌H
SP34063A
R3 180
1
8
B
A
S
Q
R
D1
1N5819
7
Ipk
OSC
6
+
3
-
1.25V
Reference
Regulator
5
4
CT
2
RSC
0.22
V
IN
= 12V
+
C1
100碌F
CT
1500 pF
R1 47k
VOUT
L2 1.0
碌H
28V/175mA
+ C2
330
碌F
+
Optional
Filter
VOUT
C3
100
碌F
R2 2.2k
Date: 1/11/05
SP34063A 1.5A Buck/Boost/Inverting DC-DC Switching Regulator
漏 Copyright 2005 Sipex Corporation
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