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LM2576 Dataheets PDF



Part Number LM2576
Manufacturers HTC
Logo HTC
Description Step-Down Switching Regulator
Datasheet LM2576 DatasheetLM2576 Datasheet (PDF)

3A, 52kHz, Step-Down Switching Regulator LM2576 FEATURES z 3.3V, 5.0V, 12V and Adjustable Output Versions z Adjustable Version Output Voltage Range, 1.23 to 37V +/- 4% AG10Maximum Over Line and Load Conditions z Guaranteed 3.0A Output Current z Wide Input Voltage Range z Requires Only 4 External Components z 52kHz Fixed Frequency Internal Oscillator z TTL Shutdown Capability, Low Power Standby Mode z High Efficiency z Uses Readily Available Standard Inductors z Thermal Shutdown and Current Lim.

  LM2576   LM2576



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3A, 52kHz, Step-Down Switching Regulator LM2576 FEATURES z 3.3V, 5.0V, 12V and Adjustable Output Versions z Adjustable Version Output Voltage Range, 1.23 to 37V +/- 4% AG10Maximum Over Line and Load Conditions z Guaranteed 3.0A Output Current z Wide Input Voltage Range z Requires Only 4 External Components z 52kHz Fixed Frequency Internal Oscillator z TTL Shutdown Capability, Low Power Standby Mode z High Efficiency z Uses Readily Available Standard Inductors z Thermal Shutdown and Current Limit Protection z Moisture Sensitivity Level 3 for SMD packages SOP8-PP PKG TO-220 PKG TO-263 PKG APPLICATION z Simple High-Efficiency Step-Down(Buck) Regulator z Efficient Pre-Regulator for Linear Regulators z On-Card Switching Regulators z Positive to Negative Converter(Buck-Boost) z Negative Step-Up Converters z Power Supply for Battery Chargers ORDERING INFORMATION Device Marking LM2576DP-X.X LM2576-X.X LM2576T-X.X LM2576-X.X LM2576R-X.X LM2576-X.X Package SOP8-PP TO-220 TO-263 DESCRIPTION The LM2576 series of regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step-down switching regulator (buck converter). All circuits of this series are capable of driving a 3.0A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5.0V, 12V and an adjustable output version. These regulators were designed to minimize the number of external components to simplify the power supply design. Standard series of inductors optimized for use with the LM2576 are offered by several different inductor manufacturers. Since the LM2576 converter is a switch-mode power supply, its efficiency is significantly higher in comparison with popular three-terminal linear regulators, especially with higher input voltages. In many cases, the power dissipated is so low that no heatsink is required or its size could be reduced dramatically. A standard series of inductors optimized for use with the LM2576 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies. The LM2576 features include a guaranteed +/- 4% tolerance on output voltage within specified input voltages and output load conditions, and +/-10% on the oscillator frequency (+/- 2% over 0˚C to 125˚C). External shutdown is included, featuring 80㎂(typical) standby current. The output switch includes cycle- bycycle current limiting, as well as thermal shutdown for full protection under fault conditions. Dec 2011 – Rev. 1.3 -1 - HTC 3A, 52kHz, Step-Down Switching Regulator LM2576 Ordering Information VOUT Package Order No. SOP8-PP LM2576DP-ADJ ADJ TO220-5L LM2576T-ADJ TO263-5L LM2576R-ADJ SOP8-PP LM2576DP-3.3 3.3V TO220-5L LM2576T-3.3 TO263-5L LM2576R-3.3 SOP8-PP LM2576DP-5.0 5.0V TO220-5L LM2576T-5.0 TO263-5L LM2576R-5.0 SOP8-PP LM2576DP-12 12V TO220-5L LM2576T-12 TO263-5L LM2576R-12 Description 3A, Adjustable, 52kHz, On/off 3A, Adjustable, .


RC0512 LM2576 ADM5120P


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