Microchip logo
  • All
  • Products
  • Documents
  • Applications Notes
product primary image

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
View More
Overview
Documents
Development Environment
RoHS Information
Add To Cart

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

Jump to:

Development tools data is currently unavailable.

RoHS Information

Part Number
Device Weight (g)
Shipping Weight (grams)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
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
LM2576-5.0WU-TR
1.462500
2.053333
5
DDPAK
-
Matte Tin
e3
LM2576-3.3WU
1.462500
2.520000
5
DDPAK
-
Matte Tin
e3
LM2576-5.0WT
1.983900
3.120000
5
TO-220
-
Matte Tin
e3
LM2576WT
1.983900
3.120000
5
TO-220
-
Matte Tin
e3
LM2576-3.3WT
1.983900
3.120000
5
TO-220
-
Matte Tin
e3
LM2576-12WT
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.

Buy from Microchip

Grid
View
Table
View
Filter:
Apply
Clear
Only show products with samples
Product
Leads
Package Type
Temp Range
Packing Media
5K Pricing
Buy