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SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator 14-SOIC -40 to 125
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LM2574, LM2574HVSNVS104D–JUNE 1999–REVISED APRIL 2016
LM2574x SIMPLE SWITCHER® 0.5-A Step-Down Voltage Regulator Features 3.3-V, 5-V, 12-V, 15-V, and Adjustable Output
Versions Adjustable Version Output Voltage Range: 1.23V37V (57Vfor HV version) ±4% Maximum Over
Line and Load Conditions Specified 0.5-A Output Current Wide Input Voltage Range:40V,upto60V for Version Requires Only4 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
Applications Simple High-Efficiency Step-Down (Buck)
Regulator Efficient Preregulator for Linear Regulators On-Card Switching Regulators Positive-to-Negative Converter (Buck-Boost)
DescriptionThe LM2574xx seriesof regulators are monolithic
integrated circuits that provideall the active functions
fora step-down (buck) switching regulator, capableof
drivinga 0.5-A load with excellent line and load
regulation. These devices are availablein fixed output
voltagesof 3.3V,5V, 12V,15V, and an adjustable
output version.
Requiring a minimum number of external
components, these regulators are simpleto use and
include internal frequency compensation anda fixed-
frequency oscillator.
The LM2574xx series offers a high-efficiency
replacement for popular three-terminal linear
regulators. Becauseofits high efficiency, the copper
traceson the printed-circuit board (PCB) are normally
the only heat sinking needed. standard seriesof inductors optimized for use with
the LM2574 are available from several different
manufacturers. This feature greatly simplifies the
designof switch-mode power supplies.
Other features includea specified ±4% tolerance on
output voltage within specified input voltages and
output load conditions, and ±10% on the oscillator
frequency. External shutdownis included, featuring
50-μA (typical) standby current. The output switch
includes cycle-by-cycle current limiting, as well as
thermal shutdown for full protection under fault
conditions.
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
Typical Application (Fixed Output Voltage Versions)
