LM2575

ACTIVE

1-A Simple Step-Down Adjustable Voltage Switching Regulator with Output Enable

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Product details

Parameters

Vin (Min) (V) 4.75 Vin (Max) (V) 40 Vout (Min) (V) 1.23 Vout (Max) (V) 37 Iout (Max) (A) 1 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 47 Switching frequency (Max) (kHz) 58 Features Enable, Over Current Protection Control mode Voltage Mode Duty cycle (Max) (%) 98 Type Converter Operating temperature range (C) -40 to 125 Rating Catalog open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

PDIP (N) 16 181 mm² 19.3 x 9.4 open-in-new Find other Buck converters (integrated switch)

Features

  • Adjustable With a Range of 1.23 V to 37 V and
    ±4% Regulation (Max) Over Line, Load, and
    Temperature Conditions
  • Specified 1-A Output Current
  • Wide Input Voltage Range 4.75 V to 40 V
  • Uses Readily Available Standard Inductors
  • 52-kHz (Typical) Fixed-Frequency Internal
    Oscillator
  • TTL Shutdown Capability With 50-µA (Typical)
    Standby Current
  • High Efficiency…as High as 88% (Typical)
  • Thermal Shutdown and Current-Limit Protection
    With Cycle-by-Cycle Current Limiting
  • For the Full Offering of Voltages (Including Fixed-
    Output Options) and Packages (Including TO-
    263), See TL2575 Data Sheet, SLVS638
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Description

The LM2575 device greatly simplifies the design of switching power supplies by conveniently providing all the active functions needed for a step-down (buck) switching regulator in an integrated circuit. Accepting a wide input voltage range and available in an adjustable output version, the LM2575 has an integrated switch capable of delivering 1 A of load current, with excellent line and load regulation. The device also offers internal frequency compensation, a fixed-frequency oscillator, cycle-by-cycle current limiting, and thermal shutdown. In addition, a manual shutdown is available through an external ON/OFF pin.

The LM2575 represents a superior alternative to popular three-terminal linear regulators. Due to its high efficiency, it significantly reduces the size of the heat sink and, in many cases, no heat sink is required. Optimized for use with standard series of inductors available from several different manufacturers, the LM2575 greatly simplifies the design of switch-mode power supplies by requiring a minimal addition of only four to six external components for operation.

The LM2575 is characterized for operation over the virtual junction temperature range of –40°C to 125°C.

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Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
LMR33610 ACTIVE SIMPLE SWITCHER® 3.8-V to 36-V, 1-A synchronous step-down converter in SOIC-8 package Next-generation 3.8-V to 36-V, 1-A synchronous step-down converter in SOIC-8 package.

Technical documentation

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Type Title Date
* Datasheet LM2575 1-A Simple Step-Down Switching Voltage Regulator datasheet (Rev. F) Aug. 31, 2015
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Technical articles More components, more problems Jun. 13, 2016
Technical articles Have you been had? Check the stated vs. actual current limit Apr. 19, 2016
Application notes Semiconductor and IC Package Thermal Metrics (Rev. C) Apr. 19, 2016
Technical articles SIMPLE SWITCHER regulators deliver a powerful punch for years Mar. 08, 2016
Application notes AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) Apr. 24, 2013
Application notes AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) Apr. 23, 2013
Application notes AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) Apr. 23, 2013
Application notes AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) Apr. 23, 2013
Application notes AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) Apr. 23, 2013
Application notes AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) Apr. 23, 2013
Application notes AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) Apr. 23, 2013
Application notes AN-776 20-W SIMPLE SWITCHER Forward Converter (Rev. A) Apr. 23, 2013
Application notes Input and Output Capacitor Selection Sep. 19, 2005
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations Jul. 12, 2005
Application notes AN-643 EMI/RFI Board Design (Rev. B) May 03, 2004

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Design tools & simulation

SIMULATION MODELS Download
SNVMB23.ZIP (2 KB) - PSpice Model
SIMULATION MODELS Download
SNVMB24.ZIP (46 KB) - PSpice Model
DESIGN TOOLS Download
Switchers Made Simple
SWITCHERSMADESIMPLE-SW Note: The Switchers Made Simple design computations have been incorporated into Texas Instruments' award winning WEBENCH Power Designer Online Design Tool. Please use TI's WEBENCH Power Designer online tools for new designs. The WEBENCH Design Tool also includes:
  • Visual design optimization for (...)

CAD/CAE symbols

Package Pins Download
PDIP (N) 16 View options

Ordering & quality

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