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LM5009MM Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM5009MM Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 14 page  LM5009 150 mA, 100V Step-Down Switching Regulator General Description The LM5009 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient, Buck bias regulator. This device is capable of driving a 150 mA load current from a 9.5V to 95V input source. The switching frequency can exceed 600 kHz, depending on the input and output voltages. The output voltage may be set from 2.5V to 85V. This high voltage regulator contains an N-Channel buck switch and internal startup regulator. The device is easy to implement and is provided in the MSOP-8 and the thermally enhanced LLP-8 packages. The LM5009 is a well suited alternative to a high voltage monolithic or discrete linear solution where the power loss becomes unacceptable. The regulator’s operation is based on a hysteretic control scheme using an ON time inversely proportional to VIN. This feature allows the operating frequency to remain relatively constant over load and input voltage variations. The hyster- etic control requires no loop compensation, resulting in an ultra-fast transient response. An intelligent current limit is implemented with forced OFF time, which is inversely pro- portional to Vout. This scheme ensures short circuit protec- tion while providing minimum foldback. Other features in- clude: Thermal Shutdown, Vcc under-voltage lockout, Gate drive under-voltage lockout, and Maximum Duty Cycle lim- iter. Features n Integrated N-Channel MOSFET n Guaranteed 150 mA output current capability n Ultra-Fast Transient Response n No loop compensation required n Vin feed forward provides constant operating frequency n Switching frequency can exceed 600 kHz n Highly efficient operation n 2% accurate 2.5V feedback from -40˚C to 125˚C n Internal startup regulator n Intelligent current limit protection n External shutdown control n Thermal shutdown n MSOP-8 and thermally enhanced LLP packages Typical Applications n Heat sink eliminator for classic linear regulator applications n 12V, 24V, 36V, and 48V rectified AC systems n 42V Automotive n Non-isolated AC mains charge coupled supplies n LED Current Source Package n MSOP - 8 n LLP - 8 (4mm x 4mm) (Available Soon) Typical Application Circuit 20165828 Basic Stepdown Regulator February 2006 © 2006 National Semiconductor Corporation DS201658 www.national.com |
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