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LM2597 Folha de dados(PDF) 1 Page - Texas Instruments |
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LM2597 Folha de dados(HTML) 1 Page - Texas Instruments |
1 / 48 page LM2597, LM2597HV www.ti.com SNVS119C – MARCH 1998 – REVISED APRIL 2013 LM2597/LM2597HV SIMPLE SWITCHER® Power Converter 150 kHz 0.5A Step-Down Voltage Regulator, with Features Check for Samples: LM2597, LM2597HV 1 FEATURES DESCRIPTION The LM2597/LM2597HV series of regulators are 23 • 3.3V, 5V, 12V, and Adjustable Output Versions monolithic integrated circuits that provide all the • Adjustable Version Output Voltage Range, active functions for a step-down (buck) switching 1.2V to 37V (57V for HV Version)±4% Max Over regulator, capable of driving a 0.5A load with Line and Load Conditions excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, • Specified 0.5A Output Current and an adjustable output version, and are packaged • Available in 8-pin Surface Mount and PDIP-8 in an 8-lead PDIP and an 8-lead surface mount Package package. • Input Voltage Range Up to 60V This series of switching regulators is similar to the • 150 kHz Fixed Frequency Internal Oscillator LM2594 series, with additional supervisory and • Shutdown /Soft-start performance features added. • Out of Regulation Error Flag Requiring a minimum number of external • Error Output Delay components, these regulators are simple to use and include internal frequency compensation†, improved • Bias Supply Pin (VBS) for Internal Circuitry line and load specifications, fixed-frequency oscillator, Improves Efficiency at High Input Voltages Shutdown /Soft-start, error flag delay and error flag • Low Power Standby Mode, IQ Typically 85 μA output. • High Efficiency The LM2597/LM2597HV series operates at a • Uses Readily Available Standard Inductors switching frequency of 150 kHz thus allowing smaller • Thermal Shutdown and Current Limit sized filter components than what would be needed with lower frequency switching regulators. Because of Protection its high efficiency, the copper traces on the printed circuit board are normally the only heat sinking APPLICATIONS needed. • Simple High-efficiency Step-down (Buck) A standard series of inductors (both through hole and Regulator surface mount types) are available from several • Efficient Pre-regulator for Linear Regulators different manufacturers optimized for use with the • On-card Switching Regulators LM2597/LM2597HV series. This feature greatly simplifies the design of switch-mode power supplies. • Positive to Negative Converter Other features include a specified ±4% tolerance on output voltage under all conditions of input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 85 μA standby current. Self protection features include a two stage current limit for the output switch and an over temperature shutdown for complete protection under fault conditions. The LM2597HV is for use in applications requiring and input voltage up to 60V. †Patent Number 5,382,918. 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 SIMPLE SWITCHER, Switchers Made Simple are registered trademarks of Texas Instruments. 3 All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 1998–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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