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LM34919B Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM34919B Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 20 page  LM34919B May 26, 2010 Ultra Small 40V, 600 mA Constant On-Time Buck Switching Regulator General Description The LM34919B 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, reduc- ing 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. Features ■ AEC-Q100 Grade 1 qualified (-40°c to 125°c) ■ Maximum switching frequency: 2.6 MHz (V IN=14V,Vo=3.3V) ■ Input Voltage Range: 6V to 40V ■ Integrated N-Channel buck switch ■ Integrated start-up regulator ■ No loop compensation required ■ Ultra-Fast transient response ■ Operating frequency remains constant with load current and input voltage ■ Maximum Duty Cycle Limited During Start-Up ■ Adjustable output voltage ■ Valley Current Limit At 0.64A ■ Precision internal reference ■ Low bias current ■ Highly efficient operation ■ Thermal shutdown Typical Applications ■ Automotive Safety and Infotainment ■ High Efficiency Point-Of-Load (POL) Regulator ■ Non-Isolated Telecommunication Buck Regulator ■ Secondary High Voltage Post Regulator Package ■ micro SMD (2mm x 2mm) Basic Step Down Regulator 30102731 © 2010 National Semiconductor Corporation 301027 www.national.com |
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