ONS19560604-芯片资料介绍.pdf
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© Semiconductor Components Industries, LLC, 2005
December, 2005 − Rev. 18
1 Publication Order Number:
MC34063A/D
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
Figure 1. Representative Schematic Diagram
SQ
R
Q2
Q1
100
I
pk
Oscillator
C
T
Comparator
+
−
1.25 V
Reference
Regulator
1
2
3
45
6
7
8
Drive
Collector
I
pk
Sense
V
CC
Comparator
Inverting
Input
Switch
Collector
Switch
Emitter
Timing
Capacitor
GND
(Bottom View)
This device contains 51 active transistors.
SOIC−8
D SUFFIX
CASE 751
PDIP−8
P, P1 SUFFIX
CASE 626
1
8
1
8
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
ORDERING INFORMATION
1
Switch
Collector
Switch
Emitter
Timing
Capacitor
GND
Driver
Collector
I
pk
Sense
V
CC
Comparator
Inverting
Input
(Top View)
2
3
45
6
7
8
PIN CONNECTIONS
http://onsemi.com
x = 3 or 4
A = Assembly Location
L, WL = Wafer Lot
Y, YY = Year
W, WW = Work Week
G or G = Pb−Free Package
1
8
3x063AP1
AWL
YYWWG
1
8
33063AVP
AWL
YYWWG
3x063
ALYWA
G
1
8
MARKING
DIAGRAMS
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