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LM34919 Arkusz danych(PDF) 1 Page - National Semiconductor (TI) |
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LM34919 Arkusz danych(HTML) 1 Page - National Semiconductor (TI) |
1 / 18 page June 2, 2008 LM34919 Ultra Small 40V, 600 mA Constant On-Time Buck Switching Regulator General 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 avail- able 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 implemen- tation. 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 re- sults in a smooth transition from constant voltage to constant current mode when current limit is detected, reducing the fre- quency and output voltage, without the use of foldback. Ad- ditional features include: VCC under-voltage lockout, thermal shutdown, gate drive under-voltage lockout, and maximum duty cycle limiter. Features ■ Integrated N-Channel buck switch ■ Integrated start-up regulator ■ Input Voltage Range: 8V to 40V ■ No loop compensation required ■ Ultra-Fast transient response ■ Operating frequency remains constant with load current and input voltage ■ Maximum switching frequency: 2.0 MHz ■ 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 ■ High Efficiency Point-Of-Load (POL) Regulator ■ Non-Isolated Telecommunication Buck Regulator ■ Secondary High Voltage Post Regulator Package ■ micro SMD Basic Step Down Regulator 30004431 © 2008 National Semiconductor Corporation 300044 www.national.com |
Podobny numer części - LM34919_08 |
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Podobny opis - LM34919_08 |
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