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LM2574

0.5A Step-Down SMPS Regulator

Status: In Production

Features:

  • 3.3V, 5V, 12V, and adjustable output versions
  • Adjustable version output 1.23V to 37V ±4% Max. over Line and Load conditions.
  • Guaranteed 0.5A output current
  • Wide input voltage, up to 40V
  • Thermal shutdown and current limit protection
  • Requires only 4 external components.
  • Shutdown capability (standby mode)
  • Low power standby mode < 200µA typical
  • High efficiency
  • 52kHz fixed frequency internal oscillator
  • Uses standard inductors
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Overview
Documents
Development Environment
RoHS Information
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Device Overview

Summary

The LM2574 family is a series of easy to use fixed and adjustable switching voltage regulators. The LM2574 contains all of the active circuitry necessary to construct a stepdown (buck) switching regulator and requires a minimum of external components.

The LM2574 is available in 3.3V, 5V, and 12V fixed output versions, or an adjustable version with an output voltage range of 1.23V to 37V. Output voltage is guaranteed to ±4% for specified input and load conditions.

The LM2574 can supply 0.5A while maintaining excellent line and load regulation. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

An external shutdown connection selects operating or standby modes. Standby current is less than 200µA.

Heat sinks are generally unnecessary due the regulator's high efficiency. Adequate heat transfer is usually provided by soldering all package pins to a printed circuit board.

The LM2574 includes internal frequency compensation and an internal 52kHz fixed frequency oscillator guaranteed to ±10% of the frequency.

Circuits constructed around the LM2574 use a standard series of inductors which are available from several different manufacturers.

Additional Features
    • 3.3V, 5V, 12V, and adjustable output versions
    • Adjustable version output 1.23V to 37V ±4% Max. over Line and Load conditions.
    • Guaranteed 0.5A output current
    • Wide input voltage, up to 40V
    • Thermal shutdown and current limit protection
    • Requires only 4 external components.
    • Shutdown capability (standby mode)
    • Low power standby mode < 200µA typical
    • High efficiency
    • 52kHz fixed frequency internal oscillator
    • Uses standard inductors
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
500
Quiescent Current (mA) typ
5
Switching Frequency (kHz)
52
Operating Temp Range
-40 to 125
Vfb (V)
1.23
Duty Cycle Max (%)
98
SHUTDOWN Current (µA) (Typ)
50

Documents

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RoHS Information

Part Number
Device Weight (g)
Shipping Weight (grams)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
LM2574-5.0YN
0.486700
0.900000
8
PDIP
.300in
Matte Tin
e3
LM2574YN
0.486700
0.900000
8
PDIP
.300in
Matte Tin
e3
LM2574-3.3YN
0.486700
0.900000
8
PDIP
.300in
Matte Tin
e3
LM2574-12YN
0.486700
0.900000
8
PDIP
.300in
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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