Description
The GM7230 series of regulators provide all the active func-
tions for a step-down (buck) switching regulator, and drive
3A load with excellent line and load regulation. GM7230's
are available in fixed output voltages of 3.3V, 5V, 12V, and
a
Adjustable output version.
These regulators are simple to use and require a minimum
number of external components. Features include internal
frequency compensation and a fixed-frequency oscillator.
The GM7230 series are high-efficiency replacements for
popular three-terminal linear regulators, requiring a smaller
heatsink or even no heatsink.
The GM7230's perform well with standard inductors from
several manufacturers, simplifying the design of switch-
mode power supplies. The GM7230 series guarantee ±4%
tolerance on output voltage within specified input voltages
and output load conditions, and ±10% on the oscillator fre-
quency.
External shutdown is included, with 80 µA (typical) standby
current. The output switch has cycle-by-cycle current limit-
ing, as well as thermal shutdown for full protection under
fault conditions.
versatile
TYPICAL APPLICATIONS
Features
3.3V, 5V, 12V and 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 up to 40V
Requires only 4 external components
High efficiency
TTL shutdown capability, low power standby
mode
Thermal shutdown, current limit protection
Uses standard inductors
150 kHz fixed frequency internal oscillator
12V
Unregulated
DC Input
+ C
IN
680 µF
+VIN
1
5
3
4
2
GND
D1
1N5824
Output
68 µH
L1
Feedback
COUT
220 µF
5.0V
Regulated
Output
3A Load
+
ON / OFF
GM7230
5.0
GM7230
3A STEP-DOWN VOLTAGE REGULATOR
www.gammamicro.com
1
Power Management
Pre-regulator for linear regulators
High-efficiency step-down buck regulator
Application
On-card/board switching regulators
Positive to negative converter (buck-boost)
PRELIMINARY
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