SP34063A Datasheet, PDF (1/10 Pages) Sipex Corporation – 1.5A Buck/Boost/Inverting DC-DC Switching Regulator

®
Advanced
SP34063A
1.5A Buck/Boost/Inverting DC-DC Switching
Regulator
FEATURES
■ Supply Voltage: 3V - 36V
■ Current Limiting
■ Output Switch Current to 1.5A
■ Adjustable Output Voltage
■ Operation frequency up to 110KHz
■ Low Quiescent Current
■ Precision 2% Reference
■ Available in 8 pin NSOIC Package
Switch ₁
Collector
Switch ₂
Emitter
Timing 3
Capacitor
GND 4
8 PIN NSOIC
8 Driver
Collector
7 I_PK Sense
6 VCC
5 Comparator
Inverting Input
Now Available in Lead Free Packaging
APPLICATIONS
■ Battery Charger Circuit
■ NICs/Switches/Hubs
■ ADSL Modems
■ 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.
L1 150µH
TYPICAL APPLICATION CIRCUIT
R3 180 ₈
7
RSC
0.22
VIN = 12V
6
+ _C1
100µF
5
SP34063A
B
S
A
Q
R
Ipk
OSC ^CT
+
-
1.25V
Reference
Regulator
R2 2.2k
R1 47k
1
D1
1N5819
2
3
CT
1500 pF
4
VOUT
L2 1.0 µH
28V/175mA
VOUT
+ _C2
330 µF
Optional
Filter
+ _C3
100 µF
Date: 1/11/05
SP34063A 1.5A Buck/Boost/Inverting DC-DC Switching Regulator
1
© Copyright 2005 Sipex Corporation