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SC4508A Datasheet(PDF) 1 Page - Semtech Corporation |
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SC4508A Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 21 page  POWER MANAGEMENT 1 www.semtech.com SC4508A Buck or Buck-Boost (Inverting) Current Mode Controller Description Revision: July 25, 2007 Features Typical Application Circuits Applications Wide input voltage range 2.7V to 15V Programmable output voltage Programmable switching frequency up to 1.5MHz Buck or buck boost (inverting) configuration Current mode control with slope compensation Very low quiescent current in shutdown mode Accessible reference voltage Hiccup mode after 32 cycle-by-cycle OCP 4mm x 4mm MLPQ-12 lead free package. This product is fully WEEE and RoHS compliant Low power point of use converters Single or multiple output low power converters Positive and/or negative output voltage DSL cards Graphic cards I/O cards Negative bias supplies The SC4508A is a low voltage current mode switching regulator controller that drives a P-channel power MOSFET with programmable switching frequency. It can be configured in either buck or buck boost (inverting) con- verters. The converters can be operated from 2.7V to 15V input voltage range. The typical operating supply current is 3mA and a shutdown pin allows the user to turn the controller off reducing it to less than 200µA. The output voltage can adjusted by external resistor di- vider. The switching frequency is programmable up to 1.5MHz, allowing small inductor and capacitor values to minimize PCB space. The operating current level is pro- grammable via an external sense resistor. Accessible ref- erence voltage allows users to make output voltage as low as they want. GND COMP SS/EN OSC FB+ FB- CS OUT V+ VREF SC4508A Vin Vout Vout VREF CS OUT V+ FB+ FB- COMP SS/EN OSC SC4508A GND Vin |
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