LM2576 vs LM2596: How to differentiate?

ByMagi

LM2576 Basics

    The LM2576 series of monolithic integrated circuits provide all the active functions for a step–down (buck) switching regulator. Fixed versions are available with a 3.3V, 5V, or 12V fixed output. Adjustable versions have an output voltage range from 1.23V to 37V. Both versions are capable of driving a 3A load with excellent line and load regulation.

    These regulators are simple to use because they require a minimum number of external components and include internal frequency compensation and a fixed-frequency oscillator.

    The LM2576 series offers a high-efficiency replacement for popular three-terminal adjustable linear regulators. It substantially reduces the size of the heat sink, and in many cases, no heat sink is required.

 

LM2596 Basics

    The LM2596 series regulator is a monolithic integrated circuit with all the functions of a step-down switching regulator, capable of driving a 3A load through the excellent line and load regulation. These devices provide fixed output voltages of 3.3V, 5V, and 12V. These regulators require a minimum number of external components, are easy to use, and have internal frequency compensation and a fixed-frequency oscillator.

    The LM2596 series operates at a switching frequency of 150kHz and requires fewer filter components than low-frequency switching regulators. Available in a standard 5-pin TO-220 package with several different lead bend options, and a 5-pin TO-263 surface-mount package.

 

LM2576 Vs LM2596: Pinout And Configuration

                             

Pin Number Pin Name Description
1 V IN The voltage which has to be regulated is provided as input to this pin
2 Output The regulated output can be obtained through this pin
3 Ground Connected to system ground
4 Feedback This pin is provided with the feedback voltage based on which the output is regulated
5 ON/OFF Connect to the ground to activate the regulator or connect to Vcc to disable the regulator.

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Pin Number Pin Name Description
1 V IN This is the positive input power of the IC switching regulator. There must be a suitable input bypass capacitor on this pin to minimize voltage transients and to supply the switching currents required by the regulator.
2 Output This pin is an internal switch. The voltage on this pin is switched between approximately (+V IN -V SAT ) and approximately -0.5 V, and the duty cycle is V OUT /V IN. In order to minimize coupling with sensitive circuits, the copper area of the PCB connected to this pin must be kept to a minimum.
3 Ground Circuit ground
4 Feed Back Senses the regulated output voltage to complete the feedback loop
5 ON/OFF Enable pin, should be grounded for normal operation

LM2576 Vs LM2596: Datasheet

LM2576 Datasheet

LM2596 Datasheet

 

LM2576 Vs LM2596: Features

LM2576 Features

  • This voltage regulator includes fixed frequency voltage with 52kHz of the internal oscillator of frequency.

  • Available packages are TO-220 &TO-263

  • This voltage regulator provides permanent o/p voltages like 3.3V, 5V, 12V & 15V.

  • In-built current limit protection & thermal shutdown

  • The o/p voltage can be changed from 1.23V to 37V by connecting exterior components.

  • Input voltage max is 40V

  • It can resist a ±4% of tolerance on o/p voltage once the i/p voltage is in the specified range & output load conditions are satisfied & ±10% tolerance on the frequency of the oscillator.

  • For variable type voltage regulator, output voltage ranges from 1.23V – 37V

  • The specified output current is up to 3A

  • It includes an under-voltage lockout circuit that maintains the i/p voltage within a range & maintains the regulator off till it reaches a fixed threshold level.

 

 

LM2596 Features

  • 3A Step Down Voltage Regulator IC

  • Available as 3.3V regulator, 5V Regulator, 12V Regulator, and Variable regulator

  • Input Supply Voltage: 4.5V to 40V

  • Minimum Output Voltage: 3.16V

  • Continuous Output Current: 3A

  • Peak Output Current: 6.9A

  • Switching Frequency: 150KHz

  • Available in To-220 and To-263 Package

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