GM2574 Datasheet, PDF (1/8 Pages) Gamma Microelectronics Inc. – 1.5A STEP DOWN VOLTAGE SWITCHING REGULATORS

GM2574
1.5A STEP DOWN VOLTAGE SWITCHING
REGULATORS
Description
Features
GM2574 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 1.5A line and load regulations. GM2574 ‹
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 GM2574 is high-efficiency replacements for
popular three-terminal linear regulators, and is
‹
requiring a smaller heat sink or even no need
heat sink.
‹
GM2574 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 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
52 kHz fixed frequency internal oscillator
GM2574 operates at a switching frequency of
52 kHz which allowing smaller size filter
components than what would be needed with
lower frequency switching regulators.
GM2574 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)
Typical Application Circuits
7V – 40V
Unregulated
DC Input
C_IN
100µF
GM2574-5.0
1 V_IN
FB ³
Output 2
SD
GND
4
5, 6, 7, 8
L1
100µH
D1
1N5822
5V
regulated
output,
C_OUT
680µF
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