Power Management
A A
MICROELECTRONICS
GM7130
3A STEP-DOWN VOLTAGE SWITCHING REGULATORS
Features
Description
GM7130 of regulators provides all the active
functions for a step-
down (buck) switching
3.3V, 5V, 12V, 15V, Adjustable output versions
Adjustable version output voltage range 1.23V
to 37V ±4% max over line and load conditions
3A output current
regulator, and drives 3A load with excellent
line and load regulation. GM7130 is available
in fixed output voltages of 3.3V, 5V, 12V
, and a versatile Adjustable output
15V
Input voltage range 7V to 40V
version. These regulators are simple to use
and require a minimum number of external
components. Features include internal fre-
quency compensation and a fixed-frequency
oscillator.
Requires only 4 external components
High efficiency
TTL shutdown capability, low power standby
mode
Thermal shutdown, current limit protection
Uses standard inductors
The GM7130 is high-efficiency replacements
for popular three-terminal
linear regulators,
and is requiring a smaller heatsink or even
no heatsink.
GM7130 performs well with standard
inductors from several manufacturers, and
52 kHz fixed frequency internal oscillator
simplifying the design of switch-mode
power supplies. GM7130 guarantees ±4%
tolerance on output
voltage within specified
input voltages and output load conditions,
and ±10% on the oscillator frequency.
External shutdown is induced with 50 uA
(typical) standby current. The output switch
has cycle-by-cycle current limiting as well
as thermal shutdown for full
fault conditions.
protection under
Application
Pre-regulator for linear regulators
On-card/ board switching regulators
High-efficiency step-down buck regulator
Positive to negative converter (buck-boost)
TYPICAL APPLICATIONS
Feedback
4
7V - 40V
+V
IN
Unregulated
GM7130-5.0
+5V
DC Input
100 µH
1
Regulated
Output
Output
2
L1
3A Load
3
5
GND
ON/ OFF
+
+
C
IN
D1
1N5822
C
100 µF
OUT
680 µF
www.gammamicro.com
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