GM34063 Datasheet, PDF (1/10 Pages) List of Unclassifed Manufacturers – 1.5A DC-to-DC CONVERTER CONTROL CIRCUIT

PRELIMINARY
GM34063
1.5A DC-to-DC CONVERTER CONTROL CIRCUIT
„
3.0V to 40V input
„
Adjustable Output Voltage
„
Current Limiting
„
Output Switch Current to 1.5A
„
Low Standby Current
„
Operating Frequency to 100kHz
„
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:
„
CD-ROM
„
Motherboards
„
SMPS Power Supply
„
Battery Chargers
Driver Collector ⁸
7
I_pk Sense
V_CC ⁶
Comparator ⁵
Inverting unit
SCHEMATIC DIAGRAM
1
Switch Collector
I_pk 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
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