Description
The GM7130 series of regulators provide all the active functions
for a step-down (buck) switching regulator, and drive 3A load with
excellent line and load regulation. GM7130's are available in fixed
output voltages of 3.3V, 5V, 12V, 15V, and a
Adjustable
output version. These regulators are simple to use and require a
minimum number of external components. Features include inter-
nal frequency compensation and a fixed-frequency oscillator. The
GM7130 series are high-efficiency replacements for popular
three-terminal linear regulators, requiring a smaller heatsink or
even no heatsink. The GM7130's perform well with standard
inductors from several manufacturers, simplifying the design of
switch-mode power supplies. The GM7130 series guarantee ±4%
tolerance on output voltage within specified input voltages and
output load conditions, and ±10% on the oscillator frequency.
External shutdown is included, with 50 µA (typical) standby cur-
rent. The output switch has cycle-by-cycle current limiting, as well
as thermal shutdown for full protection under fault conditions.
versatile
TYPICAL APPLICATIONS
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
)
GM7130
3A STEP-DOWN VOLTAGE REGULATORS
www.gammamicro.com
1
Power Management
GM7130-5.0
7V - 40V
Unregulated
DC Input
+V
IN
1
GND
3
5
2
4
L1
Output
Feedback
100 µH
ON/ OFF
+
C
OUT
680 µF
C
IN
+
100 µF
D1
1N5822
+5V
Regulated
Output
3A Load
PRELIMINARY
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