LM2574 SIMPLE SWITCHER 4V to 40V, 0.5A Step-Down DC/DC Switching Regulator | TI.com

LM2574 (ACTIVE)

SIMPLE SWITCHER 4V to 40V, 0.5A Step-Down DC/DC Switching Regulator

SIMPLE SWITCHER 4V to 40V, 0.5A Step-Down DC/DC Switching Regulator - LM2574
Datasheet
LM2574x SIMPLE SWITCHER® 0.5-A Step-Down Voltage Regulator datasheet (Rev. E)
 

Recommended alternative parts

  • LMZ34202  -  Looking for a power module? Try the LMZ34202
  • LM43600  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   Synchronous 36V, 500mA Regulator - Higher efficiency, Low Quiescent Current, Smaller Solution Size

Description

The LM2574xx series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, 15 V, 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 LM2574xx series offers a high-efficiency replacement for popular three-terminal linear regulators. Because of its high efficiency, the copper traces on the printed-circuit board (PCB) are normally the only heat sinking needed.

A standard series of inductors optimized for use with the LM2574 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a specified ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50-µA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

Features

  • 3.3-V, 5-V, 12-V, 15-V, and Adjustable Output Versions
  • Adjustable Version Output Voltage Range: 1.23 V to 37 V (57 V for HV version) ±4% Maximum Over Line and Load Conditions
  • Specified 0.5-A Output Current
  • Wide Input Voltage Range: 40 V, up to 60 V for HV Version
  • Requires Only 4 External Components
  • 52-kHz Fixed-Frequency Internal Oscillator
  • TTL Shutdown Capability, Low-Power Standby Mode
  • High Efficiency
  • Uses Readily Available Standard Inductors
  • Thermal Shutdown and Current-Limit Protection
  • Create a Custom Design Using the LM2574 With the WEBENCH® Power Designer

All trademarks are the property of their respective owners.

New!
WEBENCH® Power Designer is now even easier to use. Try it now.

WEBENCH® Designer LM2574

  Min   Max Range
Vin –  V 4.5 to 40.0V
Vout  V 1.23 to 37V
Iout  A ≤ 0.5A
Ambient Temp  °C -40 to 125°C

What are WEBENCH® tools?

Parametrics

Compare all products in Buck converters (integrated switch) Email Download to Excel
Part number Order Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Iout (Max) (A) Regulated outputs (#) Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Features Control mode Duty cycle (Max) (%) Operating temperature range (C) Rating Package Group Type Package size: mm2:W x L (PKG)
LM2574 Order now 4     40     3.3     37     0.5     1     52     52     5     Enable
Over Current Protection    		 Voltage Mode     98     -40 to 125     Catalog     PDIP | 8
SOIC | 14    		 Converter     See datasheet (PDIP)
14SOIC: 93 mm2: 10.325 x 8.9915 (SOIC | 14)    
LM2574HV Order now 4     60     3.3     37     0.5     1     52     52     5     Enable
Over Current Protection    		 Voltage Mode     98     -40 to 125     Catalog     PDIP | 8
SOIC | 14    		 Converter     See datasheet (PDIP)
14SOIC: 93 mm2: 10.325 x 8.9915 (SOIC | 14)