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

 

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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

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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

Parametrics

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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)