MC34063A, MC33063A,
NCV33063A
1.5 A, Step−Up/Down/
Inverting Switching
Regulators
The MC34063A 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
Voltage−Inverting applications with a minimum number of external
components. Refer to Application Notes AN920A/D and AN954/D
for additional design information.
Features
http://onsemi.com
MARKING
DIAGRAMS
8
8
1
SOIC−8
D SUFFIX
CASE 751
1
3x063
ALYWA
G
•
•
•
•
•
•
•
•
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
Pb−Free Packages are Available
8
3x063AP1
AWL
YYWWG
PDIP−8
P, P1 SUFFIX
CASE 626
8
1
33063AVP
AWL
YYWWG
1
Switch
Collector
x
A
L, WL
Y, YY
W, WW
G or
G
= 3 or 4
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
1
8
Drive 8
Collector
S Q
I
pk
7
Sense
R
100
I
pk
Oscillator C
T
6
V
CC
Comparator
+
−
Comparator 5
Inverting
Input
(Bottom View)
1.25 V
Reference
Regulator
Q2
Q1
1
2
Switch
Emitter
3
PIN CONNECTIONS
Timing
Capacitor
Switch
Collector
1
2
3
4
(Top View)
8
7
6
5
Driver
Collector
I
pk
Sense
V
CC
Comparator
Inverting
Input
4
GND
Switch
Emitter
Timing
Capacitor
GND
This device contains 51 active transistors.
Figure 1. Representative Schematic Diagram
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
©
Semiconductor Components Industries, LLC, 2007
1
February, 2007 − Rev. 19
Publication Order Number:
MC34063A/D
ONSEMI [ ON SEMICONDUCTOR ]
