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LM25007SD Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM25007SD Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 12 page  LM25007 42V, 0.5A Step-Down Switching Regulator General Description The LM25007 is a monolithic step-down switching regulator featuring all of the functions needed to implement a low cost, efficient, power supply. Capable of driving a 0.5Amp load over a 9V-42V input voltage range, this device is easy to apply and is provided in the small MSOP-8 and the thermally enhanced LLP-8 packages. Ultra-fast transient response is achieved through the use of a constant on-time architecture with Vin feed forward. This feature provides an almost con- stant operating frequency over load and input voltage varia- tions. The operating frequency can be adjusted with a single resistor. This architecture is easy to use and tolerant of component selection. An intelligent current limit is imple- mented in the LM25007 with forced off time that is inversely proportional to Vout thus ensuring recovery from fault con- ditions. The output voltage may be set from 2.5V to >30V. To improve efficiency in light load applications, the Vcc pin can be connected to an external voltage source to eliminate the drop through the internal regulator. Additional features in- clude: thermal shutdown, Vcc under-voltage lockout, gate drive under-voltage lockout, and max duty cycle limiter. Features n Integrated 0.74 ohm N-Channel MOSFET switch n Guaranteed 0.5Amp output current n Ultra-Fast Transient Response n Up to 800kHz operation n No control loop compensation required n Vin feed forward provides constant operating frequency n 2% accurate 2.5V feedback from -40˚C to 125˚C n Highly efficient operation n Intelligent current limit protection n External shutdown control n Thermal shutdown n MSOP-8 and thermally enhanced LLP packages Typical Applications n 12VDC and 24VDC distributed rail systems n 24VAC systems n Automotive body electronics and telematics n Industrial systems n HB-LED constant current source Package n MSOP - 8 n LLP - 8 (4mm x 4mm) Basic Step-Down Regulator 20165513 February 2006 © 2006 National Semiconductor Corporation DS201655 www.national.com |
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