SC4508

Buck or Buck-Boost(Inverting) Current Mode Controller POWER MANAGEMENT Description The SC4508 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) converters. 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 divider. The www.DataSheet4U.com switching frequency is programmable up to 1.5MHz, allowing small inductor and capacitor values to minimize PCB space. The operating current level is programmable via an external sense resistor. Accessible reference voltage allows users to make output voltage as low as they want. SC4508 Features ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ 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 MLPQ-12 package Applications ‹ ‹ ‹ ‹ ‹ ‹ ‹ 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 Typical Application Circuits Vin Vin VDD VDD VREF VREF FB+ FBCOMP CS FB+ OUT FB- SC4508 S...