Part # LM2576HV datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM2576 LM2576HV Series SIMPLE SWITCHER® 3A Step-Down Voltage Regulator

Part Details:

LM2576/LM2576HV August 2004 LM2576/LM2576HV SeriesSIMPLE SWITCHER® 3A Step-Down Voltage RegulatorGeneral Description Features The LM2576 series of regulators are monolithic integrated n 3.3V, 5V, 12V, 15V, and adjustable output versions circuits that provide all the active functions for a step-down n Adjustable version output voltage range, Series (buck) switching regulator, capable of driving 3A load with 1.23V to 37V (57V for HV version) ±4% max over excellent line and load regulation. These devices are avail- line and load conditions able in fixed output voltages of 3.3V, 5V, 12V, 15V, and an n Guaranteed 3A output current adjustable output version. n Wide input voltage range, 40V up to 60V for SIMPLE Requiring a minimum number of external components, these HV version regulators are simple to use and include internal frequency n Requires only 4 external components compensation and a fixed-frequency oscillator. n 52 kHz fixed frequency internal oscillator The LM2576 series offers a high-efficiency replacement for n TTL shutdown capability, low power standby mode popular three-terminal linear regulators. It substantially re- n High efficiency duces the size of the heat sink, and in some cases no heat n Uses readily available standard inductors SWITCHER sink is required. n Thermal shutdown and current limit protection A standard series of inductors optimized for use with the n P+ Product Enhancement tested LM2576 are available from several different manufacturers.This feature greatly simplifies the design of switch-mode Applications power supplies. Other features include a guaranteed ±4% tolerance on out- n Simple high-efficiency step-down (buck) regulator put voltage within specified input voltages and output load n Efficient pre-regulator for linear regulators conditions, and ±10% on the oscillator frequency. External n On-card switching regulators 3A shutdown is included, featuring 50 µA (typical) standby cur- n Positive to negative converter (Buck-Boost) rent. The output switch includes cycle-by-cycle current limit- Step-Down ing, as well as thermal shutdown for full protection underfault conditions. Typical Application (Fixed Output VoltageVersions) Voltage Regulator 01147601 FIGURE 1.

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LM2576HV.pdf Datasheet