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SIMPLE SWITCHER® 40V, 3A Low Component Count Step-Down Regulator

Availability: 7,500


Package | PIN: TO-220 (NDH) | 5
Carrier: Partial Tube
Qty Price
1-9 $2.52
10-24 $2.27
25-99 $2.12
100-249 $1.85
250-499 $1.74
500-749 $1.48
750-999 $1.25
1000+ $1.19


  • 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 3-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
  • Create a Custom Design with WEBENCH Tools
  • Thermal Shutdown and Current Limit Protection

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Texas Instruments  LM2576T-ADJ/LF03

The LM2576 series of regulators are monolithic integrated circuits that provide all theactive functions for a step-down (buck) switching regulator, capable of driving 3-A load withexcellent 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 andinclude fault protection and a fixed-frequency oscillator.

The LM2576 series offers a high-efficiency replacement for popular three-terminal linearregulators. It substantially reduces the size of the heat sink, and in some cases no heat sink isrequired.

A standard series of inductors optimized for use with the LM2576 are available fromseveral different manufacturers. This feature greatly simplifies the design of switch-mode powersupplies.

Other features include a ±4% tolerance on output voltage within specified input voltagesand 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 currentlimiting, as well as thermal shutdown for full protection under fault conditions.