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GM34063 Datasheet, PDF (1/10 Pages) List of Unclassifed Manufacturers – 1.5A DC-to-DC CONVERTER CONTROL CIRCUIT | |||
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PRELIMINARY
GM34063
1.5A DC-to-DC CONVERTER CONTROL CIRCUIT
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3.0V to 40V input
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Adjustable Output Voltage
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Current Limiting
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Output Switch Current to 1.5A
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Low Standby Current
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Operating Frequency to 100kHz
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Precision 2% Reference
The GM34063 has all the functions required for
DC-to-DC converters: an internal temperature-
compensated reference, comparator, controlled
duty cycle oscillator with an active current limit
circuit, driver, and high-current output switch.
The 34063 designed for step-down, step-up and
voltage-inverting applications using a minimum
number of external components.
PIN CONNECTIONS
1 Switch
Collector
2 Switch Emitter
3 Timing
Capacitor
GND 4
8 Driver
Collector
7 Ipk Sense
6 VCC
5 Comparator
Inverting unit
(Top View)
Applications:
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CD-ROM
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Motherboards
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SMPS Power Supply
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Battery Chargers
Driver Collector 8
7
Ipk Sense
VCC 6
Comparator 5
Inverting unit
SCHEMATIC DIAGRAM
1
Switch Collector
Ipk Oscillator CT
S Q Q2
R
100
Comparator
+
-
1.25V
Reference
Regulator
Q1
2
Switch Emitter
3
Timing Capacitor
4
GND
(Bottom View)
* The GM34063 has 51 active transistors on-chip.
Revision 1, May 2002
1
www.gammamicro.com
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