G5ULM2576 Datasheet, PDF (1/7 Pages) GTM CORPORATION – Simple Switcher 3A Step-Down Voltage Regulator

ISSUED DATE :2005/04/15
REVISED DATE :
G5ULM2576
Simple Switcher 3A Step-Down Voltage Regulator
Description
The G5ULM2576 series of regulators are monolithic integrated circuits that provide all active functions for a step-down (buck) switching
regulator, capable of driving 3A load with excellent line and load regulation. These devices are available in fixed output voltage of 3.3v, 5v,
12v, 15v and an adjustable output version. Requiring a minimum number of external components, these regulators are simple to use and
include internal frequency compensation and a fixed-frequency oscillator.
The G5ULM2576 series offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially reduces the size of
the heat sink, and in some cases no heat sink is required.
A standard series if inductors optimized for use with the G5ULM2576 are available from several different manufactures. This feature
greatly simplifies the design of switch-mode power supplies. Other feature include a guaranteed ̈́4% to tolerance on output voltage within
specified input voltages and output load condition, and ̈́10% on the oscillator frequency. External shutdown is included, featuring 50uA
(typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under
fault condition.
Features
Ô¦3.3V, 5.0V, 12V, 15V and adjustable output versions
ԦAdjustable version output voltage range , 1.23V to 37V ̈́ˇ% max over line and load conditions
Ô¦Guaranteed 3A output current
Ô¦Wide input voltage range
Ô¦Efficient pre-regulator for linear regulators
Ô¦Requires only 4 external components
Ô¦52kHz fixed frequency oscillator
Ô¦TTL shutdown capability, low power standby mode
Ô¦High efficiency
Ô¦Uses readily available standard inductors
Ô¦Thermal shutdown and current limit protection
Applications
Ô¦Simple high-efficiency step-down (buck) regulator
Ô¦On-card switching regulators
Ô¦Positive to negative converter (Buck-Boost)
Package Dimensions
Typical Application (Fixed Output Voltage Version)
G5ULM2576-5.0
REF.
A
b
L4
c
L1
E
Millimeter
Min. Max.
4.40 4.80
0.66 0.91
0.00 0.30
0.36 0.5
2.29 2.79
9.80 10.4
REF.
c2
L2
D
e
L
Millimeter
Min. Max.
1.25 1.45
1.27 REF.
8.6 9.0
1.70 REF.
14.6 15.8
0˚
8˚
G5ULM2576
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