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LM34919 Arkusz danych(PDF) 1 Page - Texas Instruments |
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LM34919 Arkusz danych(HTML) 1 Page - Texas Instruments |
1 / 21 page VIN SW BST LM34919 VCC SS RON/SD 8V - 40V Input C1 RON R2 R1 C2 VOUT L1 C3 C4 D1 C6 RTN ISEN SGND FB SHUTDOWN R3 LM34919 www.ti.com SNOSAY2D – MAY 2007 – REVISED JUNE 2008 Ultra-Small 40-V 600-mA Constant On-Time Buck Switching Regulator Check for Samples: LM34919 1 FEATURES 2 • Integrated N-Channel buck switch • Precision internal reference • Integrated start-up regulator • Low bias current • Input Voltage Range: 8V to 40V • Highly efficient operation • No loop compensation required • Thermal shutdown • Ultra-Fast transient response • Micro SMD Package • Operating frequency remains constant with APPLICATIONS load current and input voltage • High Efficiency Point-Of-Load (POL) Regulator • Maximum switching frequency: 2.0 MHz • Non-Isolated Telecommunication Buck • Maximum Duty Cycle Limited During Start-Up Regulator • Adjustable output voltage • Secondary High Voltage Post Regulator • Valley Current Limit At 0.64A DESCRIPTION The LM34919 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying 0.6A to the load. This buck regulator contains an N-Channel Buck Switch, and is available in a micro SMD package. The constant on-time feedback regulation scheme requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. The operating frequency remains constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The valley current limit results in a smooth transition from constant voltage to constant current mode when current limit is detected, reducing the frequency and output voltage, without the use of foldback. Additional features include: VCC under-voltage lockout, thermal shutdown, gate drive under-voltage lockout, and maximum duty cycle limiter. 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 © 2007–2008, 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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