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LM25117 Datenblatt(PDF) 1 Page - Texas Instruments

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Teilenummer LM25117
Bauteilbeschribung  Wide Input Range Synchronous Buck Controller with Analog Current Monitor
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Hersteller  TI [Texas Instruments]
Direct Link  http://www.ti.com
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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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