SP34063A

® 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 Collector Switch Emitter Timing Capacitor GND 1 2 3 4 8 PIN NSOIC 8 Driver Collector 7 IPK 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. TYPICAL APPLICATION CIRCUIT L1 150µH 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 VIN = 12V + C1 100µF CT 1500 pF R1 47k VOUT L2 1.0 µH 28V/175mA + C2 330 µF + Optional Filter VOUT C3 100 µF R2 2.2k Date: 1/11/05 SP34063A 1.5A Buck/Boost/Inverting DC-DC Switching Regulator © Copyright 2005 Sipe...