GM7109 Datasheet, PDF (1/9 Pages) Gamma Microelectronics Inc. – 150KHz, 2A STEP DOWN VOLTAGE SWITCHING REGULATORS

GM7109
150KHz, 2A STEP DOWN VOLTAGE
SWITCHING REGULATORS
Description
Features
GM7109 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 2A line and load regulations. GM7109 is ‹
available in fixed output voltages of 3.3V, 5V,
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 GM7109 is high-efficiency replacements for
popular three-terminal linear regulators, and is
‹
requiring a smaller heat sink or even no need
heat sink.
‹
GM7109 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.
Standard SOP8 & PSOP8 package
3.3V, 5V, and Adjustable output versions
Adjustable version output voltage range
1.23V to 37V
V_OUT accuracy is 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
150 kHz fixed frequency internal oscillator
GM7109 operates at a switching frequency of
150 kHz which allowing smaller size filter
components than what would be needed with
lower frequency switching regulators.
GM7109 series are available in a standard 8-lead
SO package or 8 lead SO package with heat
sink.
Application
Pre-regulator for linear regulators
High-efficiency step-down buck regulator
On-card/board switching regulators
Positive to negative converter (buck-boost)
LCD Monitors
Typical Application Circuits
1
Unregulated
DC Input
C_IN
680µF
GM7109-5.0
1 V_IN
FB ³
Output 2
SD
GND
4
5, 6, 7, 8
L1
68µH
D1
1N5824
5V
regulated
output,
C_OUT
220µF
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