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.


Please click the following link to download the datasheet:

LM2576HV.pdf Datasheet