SMPS Controller
Description
MC34063A / MCC33063A— SMPS Controller
June 2008
MC34063A / MC33063A SMPS Controller
Features
Operation from 3.
0 to 40V Input Short Circuit Current Limiting Low Standby Current Output Switch Current of 1.
5A Without External
Transistors
Adjustable Output Voltage Frequency of Operation from 100Hz to 100KHz Step-up, Step Down, or Inverting Switching
Regulators
Description
The MC34063A/MC33063A is a monolithic regulator subsystem intended for a DC to DC converter.
The device contains a temperature-compensated bandgap reference, a duty cycle control oscillator, driver, and high-current output switch.
It can be used for stepdown, step-up, or inverting switching and series pass regulators.
8-DIP
8-SOP
Ordering Information
Part Number
MC34063AP MC34063AD MC33063AP MC33063AD
Operating Temperature Range
0 ~ +70°C 0 ~ +70°C -40 ~ +85°C -40 ~ +85°C
Eco Status
RoHS RoHS RoHS RoHS
Package
8-DIP 8-SOP 8-DIP 8-SOP
For Fairchild’s definition of “green” Eco Status, please visit: http://www.
fairchildsemi.
com/company/green/rohs_green.
html.
© 2001 Fairchild Semiconductor Corporation MC34063A/MC33063A • Rev.
1.
0.
3
www.
fairchildsemi.
com
MC34063A / MC33063A — SMPS Controller
Block Diagram
DRI VE
SWITCH
COLLECTOR COLLECTOR
81
1.
25V
REF VTG
COMP
5
COMPARATOR I NV ERTING I NP UT
S Q
4
GND IP K SENSE
TIMIN G C APA CITOR
7 3
* VCC(6)
OSCILLATOR
R
Figure 1.
Block Diagram
Q2 Q1
RD
2
© 2001 Fairchild Semiconductor Corporation MC34063A/MC33063A • Rev.
1.
0.
3
2
www.
fairchildsemi.
com
MC34063A / MC33063A — SMPS Controller
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device.
The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol VCC
VI(COMP) VC(SW) V...
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