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Home » NEWEST Products » New by Manufacturer » Texas Instruments » TI LM257x Step-Down Voltage Regulators
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National Semiconductor LM257x  SIMPLE SWITCHER® Step-Down Voltage Regulators

Texas Instruments LM257x SIMPLE SWITCHER® Step-Down Voltage Regulators

Texas Instruments LM257x SIMPLE SWITCHER® Step-Down Voltage Regulators are high efficiency devices ranging from 0.5A to 3A output current. TI LM2574 and LM2574HV SIMPLE SWITCHER Step-Down Voltage Regulators provide all the active functions for a step-down (buck) switching regulator capable of driving a 0.5A load with excellent line and load regulation. LM2575 and LM2575HV Step-Down Voltage Regulators provide all the active functions for a step-down (buck) switching regulator capable of driving a 1A load with excellent line and load regulation. LM2576 and LM2576HV Step-Down Voltage Regulators provide all the active functions for a step-down (buck) switching regulator capable of driving 3A load with excellent line and load regulation. LM2577 SIMPLE SWITCHER 3A Step-Up Voltage Regulators provide all the power and control functions for step-up (boost), flyback, and forward converter switching regulators. TI LM257x devices are a high-efficiency replacement for popular three-terminal linear regulators.



LM2574 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
  • Guaranteed 0.5A output current
  • Wide input voltage range, 40V, up to 60V for HV version
  • Requires only 4 external components
  • 52kHz fixed frequency internal oscillator
  • TTL shutdown capability, low power standby mode
  • High efficiency
  • Uses readily available standard inductors
  • Thermal shutdown and current limit protection
LM2574 Applications
  • Simple high-efficiency step-down (buck) regulator
  • Efficient pre-regulator for linear regulators
  • On-card switching regulators
  • Positive to negative converter (Buck-Boost)

Application Circuit
Application Circuit


LM2575 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
  • Guaranteed 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
LM2575 Applications
  • Simple high-efficiency step-down (buck) regulator
  • Efficient pre-regulator for linear regulators
  • On-card switching regulators
  • Positive to negative converter (Buck-Boost)

Application Circuit
Application Circuit


LM2576 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
  • Guaranteed 3A 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
LM2576 Applications
  • Simple high-efficiency step-down (buck) regulator
  • Efficient pre-regulator for linear regulators
  • On-card switching regulators
  • Positive to negative converter (Buck-Boost)

Application Circuit
Application Circuit


LM2577 Features
  • Requires few external components
  • NPN output switches 3.0A, can stand off 65V
  • Wide input voltage range: 3.5V to 40V
  • Current-mode operation for improved transient response, line regulation, and current limit
  • 52kHz internal oscillator
  • Soft-start function reduces in-rush current during start-up
  • Output switch protected by current limit, under-voltage lockout, and thermal shutdown
LM2577 Applications
  • Simple boost regulator
  • Flyback and forward regulators
  • Multiple-output regulator

Application Circuit
Application Circuit

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  • Semiconductors|Integrated Circuits|IC-Power Management