LM2575-N SIMPLE SWITCHER 1A Step-Down Voltage Regulator | TI.com

LM2575-N (ACTIVE) SIMPLE SWITCHER 1A Step-Down Voltage Regulator

 

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Description

The LM2575 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V, 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 LM2575 series offers a high-efficiency replacement for popular three-terminal 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 optimized for use with the LM2575 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

  • 3.3V, 5V, 12V, 15V, and Adjustable Output Versions
  • Adjustable Version Output Voltage Range,
    •  1.23V to 37V (57V for HV Version) ±4% Max Over
    •  Line and Load Conditions
  • Specified 1A Output Current
  • Wide Input Voltage Range, 40V up to 60V 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
  • P+ Product Enhancement Tested

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WEBENCH® Designer LM2575-N

  Min   Max Range
Vin  V 4.5 to 40.0V
Vout  V 1.23 to 37V
Iout  A ≤ 1A
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)
LM2575-N Order now 4     40     3.3     37     1     1     42     63     10     Enable
Over Current Protection    
Voltage Mode     98     -40 to 125     Catalog     DDPAK/TO-263 | 5
PDIP | 16
SOIC | 24
TO-220 | 5    
Converter     5DDPAK/TO-263: 155 mm2: 15.24 x 10.16 (DDPAK/TO-263 | 5)
See datasheet (PDIP)
24SOIC: 160 mm2: 10.3 x 15.5 (SOIC | 24)
See datasheet (TO-220)    
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)    
LM2575 Samples not available 4.75     40     1.23     37     1     1     47     58     5     Enable
Over Current Protection    
Voltage Mode     98     -40 to 125     Catalog     PDIP | 16     Converter     See datasheet (PDIP)    
LM2575HV Order now 4     60     3.3     57     1     1     42     63     10     Enable
Over Current Protection    
Voltage Mode     98     -40 to 125     Catalog