LM25007 Datasheet | National Semiconductor

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 constant operating frequency over load and input voltage variations. The operating frequency can be adjusted with a single resistor. This architecture is easy to use and tolerant of ponent selection. An intelligent current limit is implemented in the LM25007 with forced off time that is inversely proportional to Vout thus ensuring recovery from fault conditions. 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 include: thermal shutdown, Vcc under-voltage lockout, gate drive under-voltage lockout, and max duty cycle limiter. Features n n n n n n n n n n n n Integrated 0.74 ohm N-Channel MOSFET switch Guaranteed 0.5Amp output current Ultra-Fast Transient Response Up to 800k Hz operation No control loop pensation required Vin feed forward provides constant operating frequency 2% accurate 2.5V feedback from -40˚C to 125˚C Highly efficient operation Intelligent current limit protection External shutdown control Thermal shutdown MSOP-8 and thermally enhanced LLP packages Typical Applications n n n n n 12VDC and 24VDC distributed rail systems 24VAC systems Automotive body electronics and telematics Industrial systems HB-LED constant current source Package n MSOP - 8 n LLP - 8 (4mm x 4mm) Basic Step-Down Regulator © 2006 National Semiconductor Corporation DS201655 .national. Connection...