Datenblatt-Suchmaschine für elektronische Bauteile |
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LM34917A Datenblatt(PDF) 1 Page - Texas Instruments |
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LM34917A Datenblatt(HTML) 1 Page - Texas Instruments |
1 / 22 page FB SW LM34917A BST VCC ISEN RON/SD VIN C1 SHUT DOWN SS RTN RON C6 8V - 33V Input C3 C4 L1 D1 R1 R3 R2 C2 VOUT C7 C8 SGND LM34917A www.ti.com SNOSAX7D – DECEMBER 2007 – REVISED MARCH 2013 LM34917A Ultra Small 33V, 1.25A Constant On-Time Buck Switching Regulator with Intelligent Current Limit Check for Samples: LM34917A 1 FEATURES PACKAGE 2 • Functional Input Voltage Range: 8V to 33V • 12-Bump DSBGA Package • DSBGA package DESCRIPTION • Input Over-Voltage Shutdown at ≊ ≊35V The LM34917A Step-Down Switching Regulator • Transient Capability to 50V features all the functions needed to implement a low • Integrated N-Channel buck switch cost, efficient, buck bias regulator capable of supplying at least 1.25A to the load. To reduce • Valley current limit varies with VIN and VOUT to excessive switch current due to the possibility of a reduce excessive inductor current saturating inductor the valley current limit threshold • On-time is reduced when in current limit changes with input and output voltages, and the on- • Integrated start-up regulator time is reduced when current limit is detected. This buck regulator contains an N-Channel Buck Switch, • No loop compensation required and is available in the 12 pin DSBGA package. The • Ultra-Fast transient response constant on-time feedback regulation scheme • Maximum switching frequency: 2 MHz requires no loop compensation, results in fast load transient response, and simplifies circuit • Operating frequency remains nearly constant implementation. The operating frequency remains with load current and input voltage variations constant with line and load variations due to the • Programmable soft-start inverse relationship between the input voltage and • Precision internal reference the on-time. The valley current limit results in a smooth transition from constant voltage to constant • Adjustable output voltage current mode when current limit is detected, reducing • Thermal shutdown the frequency and output voltage, without the use of foldback. Additional features include: VCC under- TYPICAL APPLICATIONS voltage lock-out, input over-voltage shutdown, thermal shutdown, gate drive under-voltage lock-out, • High Efficiency Point-Of-Load (POL) Regulator and maximum duty cycle limit. • Non-Isolated Buck Regulator • Secondary High Voltage Post Regulator Basic Step Down Regulator 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 © 2007–2013, 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. |
Ähnliche Teilenummer - LM34917A_15 |
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Ähnliche Beschreibung - LM34917A_15 |
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