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What is MC34063A?

This electronic component, produced by the manufacturer "ON Semiconductor", performs the same function as "Step−Up / Down / Inverting Switching Regulators".


MC34063A Datasheet PDF - ON Semiconductor

Part Number MC34063A
Description Step−Up / Down / Inverting Switching Regulators
Manufacturers ON Semiconductor 
Logo ON Semiconductor Logo 


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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
www.DataSheet4U.com
Drive 8
Collector
Ipk 7
Sense
6
VCC
Comparator 5
Inverting
Input
S Q Q2
R
100
Q1
Ipk
Oscillator
CT
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
Switch
Emitter
1
2
Timing 3
Capacitor
GND 4
8
Driver
Collector
7 Ipk Sense
(Top View)
6 VCC
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
February, 2007 − Rev. 19
1
Publication Order Number:
MC34063A/D

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MC34063A equivalent
MC34063A, MC33063A, NCV33063A
8
180
7
Rsc
0.22
Vin 6
12 V +
100
5
170 mH
L
1
SQ
R
Q2
Q1
Ipk CT
OSC
VCC
+
Comp.
1.25 V
Ref
Reg
2
1N5819
3
CT
1500
pF
4
R1 2.2 k
R2
47 k
Vout
28 V/175 mA
+
330 CO
1.0 mH
Vout
+
100
Optional Filter
Test
Line Regulation
Load Regulation
Output Ripple
Efficiency
Output Ripple With Optional Filter
Conditions
Vin = 8.0 V to 16 V, IO = 175 mA
Vin = 12 V, IO = 75 mA to 175 mA
Vin = 12 V, IO = 175 mA
Vin = 12 V, IO = 175 mA
Vin = 12 V, IO = 175 mA
Figure 8. Step−Up Converter
Results
30 mV = ±0.05%
10 mV = ±0.017%
400 mVpp
87.7%
40 mVpp
http://onsemi.com
5


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1. 1.5A, Switching Regulator - Onsemi

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