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LM2576

3A Step-Down SMPS Regulator

Status: In Production

Features:

  • 3.3V, 5V, 12V, and adjustable output versions
  • Voltage over specified line and load conditions:
  • Fixed version: ±3% max. output voltage
  • Adjustable version: ±2% max. feedback voltage
  • Guaranteed 3A output current
  • Wide input voltage range: 4V to 40V
  • Wide output voltage range: 1.23V to 37V
  • Requires only 4 external components
  • 52kHz fixed frequency internal oscillator
  • Low power standby mode IQ typically < 200µA
  • 80% efficiency (adjustable version typically > 80%)
  • Uses readily available standard inductors
  • Thermal shutdown and current limit protection
  • 100% electrical thermal limit burn-in
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Overview
Documents
Development Environment
RoHS Information
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Device Overview

Summary

The LM2576 series of monolithic integrated circuits provide all the active functions for a step-down (buck) switching regulator. Fixed versions are available with a 3.3V, 5V, or 12V fixed output. Adjustable versions have an output voltage range from 1.23V to 37V. Both versions are capable of driving a 3A load with excellent line and load regulation.

These regulators are simple to use because they require a minimum number of external components and include internal frequency compensation and a fixed-frequency oscillator.

The LM2576 series offers a high efficiency replacement for popular three-terminal adjustable linear regulators. It substantially reduces the size of the heat sink, and in many cases no heat sink is required.

A standard series of inductors available from several different manufacturers are ideal for use with the LM2576 series. This feature greatly simplifies the design of switch-mode power supplies.

The feedback voltage is guaranteed to ±2% tolerance for adjustable versions, and the output voltage is guaranteed to ±3% for fixed versions, within specified input voltages and output load conditions. The oscillator frequency is guaranteed to±10%. External shutdown is included, featuring less than 200µA standby current. The output switch includes cycle-by-cycle current limiting and thermal shutdown for full protection under fault conditions.

Additional Features
    • 3.3V, 5V, 12V, and adjustable output versions
    • Voltage over specified line and load conditions:
      • Fixed version: ±3% max. output voltage
      • Adjustable version: ±2% max. feedback voltage
    • Guaranteed 3A output current
    • Wide input voltage range: 4V to 40V
    • Wide output voltage range: 1.23V to 37V
    • Requires only 4 external components
    • 52kHz fixed frequency internal oscillator
    • Low power standby mode IQ typically < 200µA
    • 80% efficiency (adjustable version typically > 80%)
    • Uses readily available standard inductors
    • Thermal shutdown and current limit protection
    • 100% electrical thermal limit burn-in
Parametrics
Name
Value
Regulator Type
Step Down (Buck)
# of Outputs
1
Input Voltage Range Min (V)
4
Input Voltage Range Max (V)
40
Output Voltage Range Min (V)
1.23
Output Current (mA) max
3000
Quiescent Current (mA) typ
30
Switching Frequency (kHz)
52
Operating Temp Range
-40 to 125
Vfb (V)
1.23
Duty Cycle Max (%)
0.98
SHUTDOWN Current (µA) (Typ)
50

Documents

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Data Sheet


Development tools data is currently unavailable.

RoHS Information

Part Number
Device Weight (g)
Shipping Weight (Kg)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
LM2576-12WT
1.983900
3.120000
5
TO-220
-
Matte Tin
e3
LM2576-3.3WT
1.983900
3.120000
5
TO-220
-
Matte Tin
e3
LM2576WT
1.983900
3.120000
5
TO-220
-
Matte Tin
e3
LM2576-3.3WU
1.462500
2.520000
5
DDPAK
-
Matte Tin
e3
LM2576-5.0WU-TR
1.462500
2.053333
5
DDPAK
-
Matte Tin
e3
LM2576-12WU
1.462500
2.520000
5
DDPAK
-
Matte Tin
e3
LM2576-3.3WU-TR
1.462500
2.053333
5
DDPAK
-
Matte Tin
e3
LM2576-5.0WU
1.462500
2.520000
5
DDPAK
-
Matte Tin
e3
LM2576WU
1.462500
2.520000
5
DDPAK
-
Matte Tin
e3
LM2576-12WU-TR
1.462500
2.053333
5
DDPAK
-
Matte Tin
e3
LM2576WU-TR
1.462500
2.053333
5
DDPAK
-
Matte Tin
e3
LM2576-5.0WT
1.983900
3.120000
5
TO-220
-
Matte Tin
e3
To see a complete listing of RoHS data for this device, please Click here
Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.

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