GM7130_13 Datasheet, PDF (1/10 Pages) Gamma Microelectronics Inc. – 3A STEP DOWN VOLTAGE SWITCHING REGULATORS

GM7130
3A STEP DOWN VOLTAGE SWITCHING
REGULATORS
Description
Features
GM7130 series is designed to provide all the

active function for a step-down (buck) switching
regulator, and drives a maximum load current as
high as 3A line and load regulations. GM7130 is

available in fixed output voltages of 3.3V, 5V,
12V and a versatile Adjustable output version.

These regulators are simple to use and require
minimum number of external components. The
features include internal frequency compensation 
and a fixed-frequency oscillator.

The GM7130 is high-efficiency replacements for
popular three-terminal linear regulators, and is
requiring a smaller heat sink or even no need

heat sink.
GM7130 performs well with standard inductors

from most of manufacturers, and simplifying the
design of switch-mode power supplies. External 
shutdown is included with 80 µA (typical) standby
current. The output switch has cycle-by-cycle

current limiting as well as thermal shutdown for
full protection under fault conditions.
3.3V, 5V, 12V and Adjustable output
versions
Adjustable version output voltage range
1.23V to 37V
V_OUT accuracy is up to ±2% under
specified input voltage the output load
conditions
Input voltage range up to 40V
Requires only 4 external components with
High efficiency
TTL shutdown capability, low power
standby mode
Built-in thermal shutdown, current limit
protection
Uses standard inductors
52 kHz fixed frequency internal oscillator
GM7130 operates at a switching frequency of
52 kHz which allowing smaller size filter
components than what would be needed with
lower frequency switching regulators.
GM7130 series are available in a standard 5-lead
TO-220, TO220B and TO263 packages.
Application
Pre-regulator for linear regulators
High-efficiency step-down buck regulator
On-card/board switching regulators
Positive to negative converter (buck-boost)
Typical Application Circuits
7V – 40V
Unregulated
DC Input
CIN
100μF
GM7130-5.0
1 V_IN
Feedback ⁴
Output 5
GND
3
ON/OFF
5
L1
100μH
D1
1N5822
5V
regulated
output,
COUT
680μF
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