MC34063AQ8

CYStech Electronics Corp. DC-to-DC Converter Control Circuit www.DataSheet4U.com Spec. No. : C501Q8 Issued Date : 2003.03.21 Revised Date :2005.06.02 Page No. : 1/7 MC34063AQ8 Description The MC34063AQ8 is a monolithic control circuit containing the primary functions required for DC-to-DC converters. This device consists of an internal temperature compensated reference, comparator, control- led duty cycle oscillator with an active current limit circuit, driver and high current output switch. Features 3V to 40V Input Voltage Operation Internal 1.6A Peak Current Switch Internal ±1.8% Reference Low Quiescent Current at 1.6mA Frequency Operation from 100Hz~100KHz Current Limiting Applications Saver for Cellular Phone DC-DC Converter Module Typical Application Circuit Fig1.Saver Circuit for Cellular Phone MC34063A RSC Vin 8 7 6 5 1 2 3 4 L1 200µH Vout D1 1N5819 Cout 220µF CT 470ρF C1 100µF RA 5.6kΩ RB 33kΩ MC34063AQ8 CYStek Product Specification CYStech Electronics Corp. Pin Connections 8 7 6 5 www.DataSheet4U.com Spec. No. : C501Q8 Issued Date : 2003.03.21 Revised Date :2005.06.02 Page No. : 2/7 1 2 3 4 Pin1:Switch Collector Pin2:Switch Emitter Pin3:Timing Capacitor Pin4:Gnd Pin5:Comparator Inverting Input Pin6:Vcc Pin7:Ipk Sense Pin8:Driver Collector Absolute Maxium Rating Supply Voltage ....................................................................................................................................... 40 V Comparator In...