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LM2595 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM2595 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 29 page  LM2595 SIMPLE SWITCHER® Power Converter 150 kHz 1A Step-Down Voltage Regulator General Description The LM2595 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1A load with excellent line and load regulation. These devices are avail- able in fixed output voltages of 3.3V, 5V, 12V, and an adjust- able output version. Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation†, and a fixed-frequency oscillator. The LM2595 series operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regu- lators. Available in a standard 5-lead TO-220 package with several different lead bend options, and a 5-lead TO-263 surface mount package. Typically, for output voltages less than 12V, and ambient temperatures less than 50˚C, no heat sink is required. A standard series of inductors are available from several dif- ferent manufacturers optimized for use with the LM2595 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 specified input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 85 µA stand-by cur- rent. Self protection features include a two stage frequency reducing current limit for the output switch and an over tem- perature shutdown for complete protection under fault condi- tions. Features n 3.3V, 5V, 12V, and adjustable output versions n Adjustable version output voltage range, 1.2V to 37V ±4% max over line and load conditions n Available in TO-220 and TO-263 (surface mount) packages n Guaranteed 1A output load current n Input voltage range up to 40V n Requires only 4 external components n Excellent line and load regulation specifications 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 converter Note: † Patent Number 5,382,918. Typical Application (Fixed Output Voltage Versions) SIMPLE SWITCHER® and Switchers Made Simple® are registered trademarks of National Semiconductor Corporation. DS012565-1 May 1999 © 1999 National Semiconductor Corporation DS012565 www.national.com |
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