GM34063 series
1.5A DC TO DC
CONVERTER CONTROL
Description
GM34063 series have 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.
GM34063 series are designed for step-down, step-up
and voltage-inverting applications by using a
minimum number of external components.
For GM34063E can operate for a temperature range
from -40°C to 125°C while GM34063F can operate
from -25°C to 85°C.
Features
3.0V to 40V Input
Adjustable Output Voltage
Output Switch Current to 1.5A
Low Standby Current
Operating Frequency to 100kHz
Precision 1 % Reference available
Application
CD-ROM
Motherboards
SMPS Power Supply
Battery Chargers
DSL Modem
Schematic Diagram
S Q
6
V
CC
I
PK
Oscillator
C
T
I
PK
Sense
Comparator
+
-
5
Comparator
Inverting Input
7
R
Q2
Q1
100
2
Switch Emitter
3
Timing Capacitor
1.25V
V
REF
4
GND
GM34063
V2.00
1
GAMMA [ GAMMA MICROELECTRONICS INC. ]
