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LM34914 Fiches technique(PDF) 1 Page - Texas Instruments |
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LM34914 Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 24 page FB SW LM34914 BST VCC ISEN RON/SD VIN C1 SHUT DOWN SS RTN SGND RON C5 8V - 40V Input C3 C4 L1 D1 R1 R3 R2 C2 VOUT LM34914 www.ti.com SNVS453B – MAY 2006 – REVISED MARCH 2013 LM34914 Ultra Small 1.25A Step-Down Switching Regulator with Intelligent Current Limit Check for Samples: LM34914 1 FEATURES DESCRIPTION The LM34914 Step-Down Switching Regulator 2 • Input Voltage Range: 8V to 40V features all the functions needed to implement a low • Integrated N-Channel Buck Switch cost, efficient, buck bias regulator capable of • Valley Current Limit Varies with VIN and VOUT supplying at least 1.25A to the load. To reduce to Reduce Excessive Inductor Current excessive switch current due to the possibility of a 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 • No Loop Compensation Required buck regulator contains a 44V N-Channel Buck Switch, and is available in the thermally enhanced 3 • Ultra-Fast Transient Response mm x 3 mm WSON-10 package. The feedback • Maximum Switching Frequency: 1.3 MHz regulation scheme requires no loop compensation, • Operating Frequency Remains Nearly results in fast load transient response, and simplifies Constant with Load Current and Input Voltage circuit implementation. The operating frequency Variations remains constant with line and load variations due to the inverse relationship between the input voltage • Programmable Soft-Start and the on-time. The valley current limit results in a • Precision Internal Reference smooth transition from constant voltage to constant • Adjustable Output Voltage current mode when current limit is detected, reducing the frequency and output voltage, without the use of • Thermal Shutdown foldback. Additional features include: VCC under- voltage lock-out, thermal shutdown, gate drive under- TYPICAL APPLICATIONS voltage lock-out, and maximum duty cycle limit. • High Efficiency Point-Of-Load (POL) Regulator Package • Non-Isolated Buck Regulator • WSON-10 (3 mm x 3mm) • Secondary High Voltage Post Regulator • Exposed Thermal Pad For Improved Heat Dissipation 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 © 2006–2013, 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. |
Numéro de pièce similaire - LM34914_15 |
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Description similaire - LM34914_15 |
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