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LM25117-Q1 bảng dữ liệu(PDF) 1 Page - Texas Instruments |
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LM25117-Q1 bảng dữ liệu(HTML) 1 Page - Texas Instruments |
1 / 43 page LM25117 LM25117-Q1 www.ti.com SNVS714D – APRIL 2011 – REVISED APRIL 2012 Wide Input Range Synchronous Buck Controller with Analog Current Monitor Check for Samples: LM25117, LM25117-Q1 1 FEATURES 2 • LM25117Q is an Automotive Grade product • Precision 1.5% voltage reference that is AEC-Q100 grade 1 qualified (-40°C to • Analog current monitor +125°C operating junction temperature) • Programmable current limit • Emulated peak current mode control • Hiccup mode over current protection • Wide operating range from 4.5V to 42V • Programmable soft-start and tracking • Robust 3.3A peak gate drives • Programmable line under-voltage lockout • Adaptive dead-time output driver control • Programmable switch-over to external bias • Free-run or synchronizable clock up to 750kHz supply • Optional diode emulation mode • Thermal shutdown • Programmable output from 0.8V DESCRIPTION The LM25117 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications. The operating frequency is programmable from 50 kHz to 750 kHz. The LM25117 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A high voltage bias regulator that allows external bias supply further improves efficiency. The LM25117’s unique analog telemetry feature provides average output current information. Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line under-voltage lockout. 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 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2011–2012, 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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