3.0A, 52kHz, Step-Down Switching Regulator
FEATURES
3.3V, 5.0V, 12V, 15V, and Adjustable Output Versions
Adjustable Version Output Voltage Range, 1.23 to 37V
+/- 4% AG10Maximum Over Line and Load Conditions
Guaranteed 3.0A Output Current
Wide Input Voltage Range
Requires Only 4 External Components
52kHz Fixed Frequency Internal Oscillator
TTL Shutdown Capability, Low Power Standby Mode
High Efficiency
Uses Readily Available Standard Inductors
Thermal Shutdown and Current Limit Protection
Moisture Sensitivity Level 3
LM2576
TO-220 PKG
1
5
TO-220V PKG
1
5
TO-263 PKG
Applications
Simple High-Efficiency Step-Down(Buck) Regulator
Efficient Pre-Regulator for Linear Regulators
On-Card Switching Regulators
Positive to Negative Converter(Buck-Boost)
Negative Step-Up Converters
Power Supply for Battery Chargers
1
5
1. Vin 2. Output 3. Ground
4. Feedback 5. On/Off
DESCRIPTION
The LM2576 series of regulators are monolithic integrated
circuits ideally suited for easy and convenient design of a
step-down switching regulator(buck converter).
All circuits of this series are capable of driving a 3.0A load
with excellent line and load regulation. These devices are
available in fixed output voltages of 3.3V, 5.0V,12V, 15V,
and an adjustable output version.
ORDERING INFORMATION
Device
LM2576T-X.X
LM2576TV-X.X
LM2576R
Marking
LM2576T-X.X
LM2576T-X.X
LM2576R-X.X
Package
TO-220
TO-220V
TO-263
These regulators were designed to minimize the number of external components to simplify the
power supply design. Standard series of inductors optimized for use with the LM2576 are offered
by several different inductor manufacturers.
Since the LM2576 converter is a switch-mode power supply, its efficiency is significantly higher in
comparison with popular three-terminal linear regulators, especially with higher input voltages.
In many cases, the power dissipated is so low that no heatsink is required or its size could
be reduced dramatically. A standard series of inductors optimized for use with the LM2576 are
available from several different manufacturers. This feature greatly simplifies the design of
switch-mode power supplies. The LM2576 features include a guaranteed +/- 4% tolerance
on output voltage within specified input voltages and output load conditions, and +/-10% on the
oscillator frequency (+/- 2% over 0oC to 125 oC).
External shutdown is included, featuring 80 ㎂(typical) standby current. The output switch includes
cycle-bycycle current limiting, as well as thermal shutdown for full protection under fault conditions.
2008 - Ver. 1.0
HTC
-1-
HTC [ HTC KOREA TAEJIN TECHNOLOGY CO. ]
