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G5ULM2576 Datasheet Preview

G5ULM2576 Datasheet

Simple Switcher 3A Step-Down Voltage Regulator

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G5ULM2576 pdf
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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
3.3V, 5.0V, 12V, 15V and adjustable output versions
Adjustable version output voltage range , 1.23V to 37V
Guaranteed 3A output current
Wide input voltage range
Efficient pre-regulator for linear regulators
Requires only 4 external components
52kHz fixed frequency oscillator
TTL shutdown capability, low power standby mode
High efficiency
Uses readily available standard inductors
Thermal shutdown and current limit protection
Applications
% max over line and load conditions
Simple high-efficiency step-down (buck) regulator
On-card switching regulators
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
Page: 1/7



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G5ULM2576 Datasheet Preview

G5ULM2576 Datasheet

Simple Switcher 3A Step-Down Voltage Regulator

No Preview Available !

G5ULM2576 pdf
Block Diagram
ISSUED DATE :2005/04/15
REVISED DATE :
3.3V, R2=17k
5.0V, R2=3.1k
12V, R2=8.84k
15V, R2=11.3k
For Adjustable version, R1=open, R2=0
Absolute Maximum Ratings (Note1)
Parameter
Maximum Supply Voltage
ON/OFF pin input Voltage
Output Voltage to ground (steady state)
Power dissipation
Storage Temperature
Maximum junction temperature
Minimum ESD rating (C=100pF, R=1.5k )
Lead temperature (soldering, 10seconds)
Ratings
45
-0.3 V +VIN
-1
Internally Limited
-65 ~ +150
+150
2k
+260
Unit
V
V
V
V
Operating Ratings
Temperature range
Supply Voltage
Parameter
Ratings
-40 TJ +125
40
Unit
V
G5ULM2576-3.3 Electrical Characteristics
Specifications with standard type face are for TJ=25 , and those with boldface type apply over full operating temperature range
Parameter
Symbol
Conditions
Min Typ Max
System Parameters (Note3) Test Circuit Figure 2
Output Voltage
VOUT
VIN=12V, ILOAD=0.5A
Circuit of Figure 2
3.234 3.3 3.366
Output Voltage
VOUT
6V VIN 40V, 0.5A ILOAD 3A
Circuit of Figure 2
3.168/3.135
3.3
3.432/3.465
Efficiency
VIN=12V, ILOAD=3A
75
Unit
V
V
%
G5ULM2576-5.0 Electrical Characteristics
Specifications with standard type face are for TJ=25 , and those with boldface type apply over full operating temperature range
Parameter
Symbol
Conditions
Min Typ Max
System Parameters (Note3) Test Circuit Figure 2
Output Voltage
VOUT
VIN=12V, ILOAD=0.5A
Circuit of Figure 2
4.9 5.0 5.1
Output Voltage
VOUT
8V VIN 40V, 0.5A ILOAD 3A
Circuit of Figure 2
4.80/4.75
5.0
5.20/5.25
Efficiency
VIN=12V, ILOAD=3A
77
Unit
V
V
%
G5ULM2576
Page: 2/7


Part Number G5ULM2576
Description Simple Switcher 3A Step-Down Voltage Regulator
Maker GTM
Total Page 7 Pages
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