Replacement of
MC34063A
MIK34063A
DC-to-DC Converter Control Circuits
October 1997 – revised November 1999
Descriptio...
Replacement of
MC34063A
MIK34063A
DC-to-DC Converter Control Circuits
October 1997 – revised November 1999
Description
The MIK34063A Series is a monolithic control circuit containing the primary functions required for DC-to-DC converters. These devices consist of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. This series was specifically designed to be incorporated in Step-Down and Step-Up and
VoltageInverting applications with a minimum number of external components.
Features
Operation from 3.0 V to 40 V Input Low Standby Current Current Limiting Output Switch Current to 1.5 A Output
Voltage Adjustable Frequency Operation to 100 kHz Precision 2% Reference
Pin connections
Schematic Diagram
Driver Collector
8 S R Q Q2 Q1 100 1
Switch Collector
Ipk Sense
7
Ipk C Oscillator T Comparator
2 3
Switch Emitter Timing Capacitor
Comparator Inverting Input
5
Absolute Maximum Ratings
Symbol VCC VIR VC(switch) VE(switch) VCE(switch) VC(driver) IC(driver) ISW TJ TA Tstg Parameter Power Supply
Voltage Comparator Input
Voltage Range Switch Collector
Voltage Switch Emitter
Voltage (VPIN1 = 40 V) Switch Collector to Emitter
Voltage Driver Collector
Voltage Driver Collector Current (Note 1) Switch Current Operating Junction Temperature Operating Ambient Temperature Range Storage Temperature Range Maximum 40 -0.3 to +40 40 40 40 40 100 1.5 +150 0...