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KA34063A

SMPS Controller
Features
Operation From 3.0 to 40V Input Short Circuit Current Limiting Low Stand-by Current Output Switch Current of 1.5A Without External Transistors Output Voltage Adjustable Frequency of Operation From 100Hz to 100kHz Step-up, Step-Down or Inverting Switching Regulators

Description
The KA34063A is a monolithic regulator sub system intended for use as DC to DC converter. This device contains a temperature compensated bandgap reference, a duty cycle control oscillator, a driver, and a high current output switch. It can be used for step down, step up or inverting switching regulators as well as for series pass regulators.
8-DIP

1

8-SOP

1

Internal Block Diagram
DRIVE COLLECTOR SWITCH COLLECTOR

8
1.25V REF VTG COMP S Q COMPARATOR INVERTING INPUT Q2

1

5

Q1

4
IPK SENSE GND
TIMING CAPACITOR

7
OSCILLATOR R

RD

3 2

VCC(6)

Rev. 1.0.1
2002 Fairchild Semiconductor Corporation

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KA34063 DATASHEET