MC34063A, MC33063A,
NCV33063A
1.5 A, Step−Up/Down/
Inverting Switching
Regulators
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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.
MARKING
DIAGRAMS
8
SOIC−8
D SUFFIX
CASE 751
3x063
ALYWA
G
8
1
1
Features
• Operation from 3.0 V to 40 V Input
• Low Standby Current
8
3x063AP1
AWL
YYWWG
• Current Limiting
• Output Switch Current to 1.5 A
• Output Voltage Adjustable
• Frequency Operation to 100 kHz
• Precision 2% Reference
PDIP−8
P, P1 SUFFIX
CASE 626
1
8
8
33063AVP
AWL
• Pb−Free Packages are Available
1
YYWWG
1
1
8
7
6
Drive
Collector
Switch
Collector
x
A
L, WL
Y, YY
= 3 or 4
Q2
= Assembly Location
= Wafer Lot
S Q
R
Q1
= Year
100
I
pk
Sense
W, WW = Work Week
G or G
2
3
Switch
Emitter
= Pb−Free Package
I
pk
Oscillator
C
T
PIN CONNECTIONS
Timing
Capacitor
V
CC
Comparator
1.25 V
Reference
Regulator
+
−
Switch
Collector
Driver
Collector
8
7
6
5
1
2
3
4
Switch
Emitter
5
4
Comparator
Inverting
Input
I
pk
Sense
GND
Timing
Capacitor
V
CC
(Bottom View)
Comparator
Inverting
Input
GND
This device contains 51 active transistors.
(Top View)
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
Publication Order Number:
February, 2007 − Rev. 19
MC34063A/D
ONSEMI [ ONSEMI ]
