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MC34063A Schematic ( PDF Datasheet ) - ON Semiconductor

Teilenummer MC34063A
Beschreibung Step−Up / Down / Inverting Switching Regulators
Hersteller ON Semiconductor
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Gesamt 13 Seiten
MC34063A Datasheet, Funktion
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
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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






MC34063A Datasheet, Funktion
8
7
Rsc
Vin 6
MC34063A, MC33063A, NCV33063A
1 Vout 8
7
2
Rsc
Vin 6
R
1
Vout
2
R ³ 0 for
constant Vin
Figure 9. External Current Boost Connections for IC Peak Greater than 1.5 A
9a. External NPN Switch
9b. External NPN Saturated Switch
(See Note 8)
8. If the output switch is driven into hard saturation (non−Darlington configuration) at low switch currents (300 mA) and high driver currents
(30 mA), it may take up to 2.0 ms to come out of saturation. This condition will shorten the off time at frequencies 30 kHz, and is magnified
at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a
non−Darlington configuration is used, the following output drive condition is recommended.
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6

6 Page









MC34063A pdf, datenblatt
MC34063A, MC33063A, NCV33063A
PACKAGE DIMENSIONS
SOIC−8 NB
D SUFFIX
CASE 751−07
ISSUE AG
−X−
A
B
−Y−
−Z−
H
85
S 0.25 (0.010) M Y M
1
4
K
G
D
C
SEATING
PLANE
N X 45 _
0.10 (0.004)
M
0.25 (0.010) M Z Y S X S
J
SOLDERING FOOTPRINT*
1.52
0.060
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
6. 751−01 THRU 751−06 ARE OBSOLETE. NEW
STANDARD IS 751−07.
MILLIMETERS
INCHES
DIM MIN MAX MIN MAX
A 4.80 5.00 0.189 0.197
B 3.80 4.00 0.150 0.157
C 1.35 1.75 0.053 0.069
D 0.33 0.51 0.013 0.020
G 1.27 BSC 0.050 BSC
H 0.10 0.25 0.004 0.010
J 0.19 0.25 0.007 0.010
K 0.40 1.27 0.016 0.050
M 0_ 8_ 0_ 8_
N 0.25 0.50 0.010 0.020
S 5.80 6.20 0.228 0.244
7.0
0.275
4.0
0.155
0.6
0.024
1.270
0.050
ǒ ǓSCALE 6:1
mm
inches
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
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12

12 Page





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