MC34063A Datasheet, PDF (1/10 Pages) ON Semiconductor – DC-to-DC CONVERTER CONTROL CIRCUITS

DC-DC Converter Control Circuits
MC34063A
● OUTPUT SWITCH CURRENT IN EXCESS OF
1.5A
● 2% REFERENCE ACCURACY
● LOW QUIESCENT CURRENT:2.5mA(TYP.)
● OPERATING FROM 3V TO 40V
● REQUENCY OPERATION TO 100KHz
● ACTIVE CURRENT LIMITING
DESCRIPTION
The MC34063A series is a monolithic control
circuit delivering the main functions for DC-DC
voltage converting.
The device contains an intermal temperature
compensated reference, comparator, duty cycle
controlled oscillator with an active current limit
circuit driver and high current output switch.
Output voltage is adjustable through two external
resistors with a 2% reference accuracy.
Employing a minimum number of external
components the MC34063A devices series is
designed for Step-Down, Step-Up and
Voltage-lnverting applications.
8 SOP/ 8 DIP PIN Configulation
Switch
Collector
1
Switch
Emitter ²
8
Drive
Collector
7 Ipk Sense
Timing
Capacitor
3
Ground ₄
6 ^Vcc
5
Comparator
- Input
ORDERING INFORMATION
Device
Package
MC34063AD
8 SOP
MC34063AN
8 DIP
BLOCK DIAGRAM
Drive
Collector
8
sQ
R
Switch
Q2
1 Collector
Q1
Ipk Sense ₇
Vcc ₆
Comparator
lnverting
5
input
Ipk Oscillator
Comparator
+
-
1.25V
Reference
Regulator
2
Switch
Emitter
3
Timing
Capacitor
4 GND
HTC
1