DC-DC Converter Control Circuits
MC34063A
● OUTPUT SWITCH CURRENT IN EXCESS OF
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●
●
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1.5A
2% REFERENCE ACCURACY
LOW QUIESCENT CURRENT:2.5mA(TYP.)
OPERATING FROM 3V TO 40V
REQUENCY OPERATION TO 100KHz
ACTIVE CURRENT LIMITING
8 SOP/ 8 DIP PIN Configulation
Switch
1
Collector
Switch
2
Emitter
Timing
3
Capacitor
Ground
8
7
6
Drive
Collector
Ipk Sense
Vcc
Comparator
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.
4
5
- Input
ORDERING INFORMATION
Device
MC34063AD
MC34063AN
Package
8 SOP
8 DIP
BLOCK DIAGRAM
Drive
Collector
8
s
R
Q
Q2
Q1
1
Switch
Collector
Ipk Sense
7
Ipk Oscillator
2
3
Switch
Emitter
Timing
Capacitor
Vcc
6
Comparator
+
-
Comparator
lnverting
input
1.25V
Reference
Regulator
4
GND
5
HTC
1
ETC [ ETC ]
