MC34063A, MC33063A,
SC34063A, SC33063A,
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
3x063
ALYWA
G
8
1
SOIC−8
D SUFFIX
CASE 751
1
8
•
•
•
•
•
•
•
•
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
1
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)
This device contains 79 active transistors.
1.25 V
Reference
Regulator
4
GND
3
1
Timing
Capacitor
x
A
L, WL
Y, YY
W, WW
G or
G
Q2
Q1
2
Switch
Emitter
1
Switch
Collector
1
8
3x063V
ALYWA
G
3x063AP1
AWL
YYWWG
PDIP−8
P, P1 SUFFIX
CASE 626
1
8
33063AVP
AWL
YYWWG
1
DFN8
CASE 488AF
33063
ALYWA
G
= 3 or 4
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
Figure 1. Representative Schematic Diagram
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
©
Semiconductor Components Industries, LLC, 2010
August, 2010
−
Rev. 23
1
Publication Order Number:
MC34063A/D
ONSEMI [ ON SEMICONDUCTOR ]
