MICROELECTRONICS
A
A
Power Management
GM7130
3A STEP-DOWN VOLTAGE SWITCHING REGULATORS
Description
GM7130 of regulators provides all the active
functions for a step- down (buck) switching
regulator, and drives 3A load with excellent
line and load regulation. GM7130 is available
in fixed output voltages of 3.3V, 5V, 12V
15V , and a
versatile
Adjustable output
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.
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
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 protection under
fault conditions.
Features
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
Input voltage range 7V to 40V
Requires only 4 external components
High efficiency
TTL shutdown capability, low power standby
mode
Thermal shutdown, current limit protection
Uses standard inductors
52 kHz fixed frequency internal oscillator
Application
Pre-regulator for linear regulators
High-efficiency step-down buck regulator
On-card/ board switching regulators
Positive to negative converter (buck-boost
)
TYPICAL APPLICATIONS
7V - 40V
Unregulated
DC Input
+V
IN
1
GM7130-5.0
Output
2
3
GND
5
ON/ OFF
D1
1N5822
100 µH
L1
+
+5V
Regulated
Output
3A Load
+
C
IN
100 µF
C
OUT
680 µF
www.gammamicro.com
GM7130
V0.1
1
Feedback
4
GM 431
GAMMA [ GAMMA MICROELECTRONICS INC. ]
