GM7130_1312 Datasheet, PDF (1/10 Pages) Gamma Microelectronics Inc. – 3A STEP DOWN VOLTAGE SWITCHING REGULATORS

GM7130
3A STEP DOWN VOLTAGE SWITCHING
REGULATORS
Description
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.
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.
Features
 3.3V, 5V, 12V and Adjustable output
versions
 ^{Adjustable version output voltage range}
1.23V to 37V
 VOUT 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
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
Feedback 4
1 VIN
GND
3
Output 5
ON/OFF
5
L1
100μH
D1
1N5822
5V
regulated
output,
COUT
680μF
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