MC34063A_07 Datasheet, PDF (1/13 Pages) ON Semiconductor – 1.5 A, Step−Up/Down/ Inverting Switching Regulators

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
• 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
Drive ⁸
Collector
I_pk ⁷
Sense
6
V_CC
Comparator ⁵
Inverting
Input
S Q ^Q2
R
Q1
100
I_pk
Oscillator
C_T
Comparator
+
1.25 V
Reference
−
Regulator
1
Switch
Collector
2 _Switch
Emitter
3 _Timing
Capacitor
4
GND
(Bottom View)
This device contains 51 active transistors.
Figure 1. Representative Schematic Diagram
http://onsemi.com
8
1
SOIC−8
D SUFFIX
CASE 751
MARKING
DIAGRAMS
8
3x063
ALYWA
G
1
8
1
PDIP−8
P, P1 SUFFIX
CASE 626
8
3x063AP1
AWL
YYWWG
1
8
33063AVP
AWL
YYWWG
1
x
A
L, WL
Y, YY
W, WW
G or G
= 3 or 4
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
PIN CONNECTIONS
Switch
Collector
1
Switch
Emitter
2
Timing ₃
Capacitor
GND 4
8
Driver
Collector
7 I_pk Sense
(Top View)
6 V_CC
Comparator
5 _Inverting
Input
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