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LM2594 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM2594 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 28 page  LM2594/LM2594HV SIMPLE SWITCHER® Power Converter 150 kHz 0.5A Step-Down Voltage Regulator General Description The LM2594/LM2594HV series of regulators are monolithic integrated circuits that 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. These de- vices are available in fixed output voltages of 3.3V, 5V, 12V, and an adjustable output version, and are packaged in a 8-lead DIP and a 8-lead surface mount package. Requiring a minimum number of external components, these regulators are simple to use and feature internal frequency compensation†, a fixed-frequency oscillator, and improved line and load regulation specifications. The LM2594/LM2594HV series operates at a switching fre- quency of 150 kHz thus allowing smaller sized filter compo- nents than what would be needed with lower frequency switching regulators. Because of its high efficiency, the cop- per traces on the printed circuit board are normally the only heat sinking needed. A standard series of inductors (both through hole and sur- face mount types) are available from several different manu- facturers optimized for use with the LM2594/LM2594HV se- ries. This feature greatly simplifies the design of switch-mode power supplies. Other features include a guaranteed ±4% tolerance on out- put voltage under all conditions of input voltage and output load conditions, and ±15% on the oscillator frequency. Ex- ternal shutdown is included, featuring typically 85 µA standby current. Self protection features include a two stage frequency reducing current limit for the output switch and an over temperature shutdown for complete protection under fault conditions. The LM2594HV is for applications requiring an input voltage up to 60V. Features n 3.3V, 5V, 12V, and adjustable output versions n Adjustable version output voltage range, 1.2V to 37V (57V for the HV version)±4% max over line and load conditions n Available in 8-pin surface mount and DIP-8 package n Guaranteed 0.5A output current n Input voltage range up to 60V n Requires only 4 external components n 150 kHz fixed frequency internal oscillator n TTL Shutdown capability n Low power standby mode, IQ typically 85 µA n High Efficiency n Uses readily available standard inductors n Thermal shutdown and current limit protection Applications n Simple high-efficiency step-down (buck) regulator n Efficient pre-regulator for linear regulators n On-card switching regulators n Positive to Negative convertor Typical Application (Fixed Output Voltage Versions) SIMPLE SWITCHER and Switchers Made Simple™ are registered trademarks of National Semiconductor Corporation. DS012439-1 December 1999 © 1999 National Semiconductor Corporation DS012439 www.national.com |
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