SC4609

Low Input, MHz Operation, High Efficiency Synchronous Buck POWER MANAGEMENT Description The SC4609 is a voltage mode step down (buck) regulator controller that provides accurate high efficiency power conversion from an input supply range of 2.7V to 5.5V. A high level of integration reduces external component count, and makes it suitable for low voltage applications where cost, size and efficiency are critical. The SC4609 is capable of producing an output voltage as low as 0.5V. SC4609 Features Asynchronous start up Programmable switching frequency up to 1MHz BiCMOS voltage mode PWM controller 2.7V to 5.5V input voltage range Output voltage as low as 0.5V +/-1% reference accuracy Sleep mode (Icc = 10µA typ) Adjustable lossless short circuit current limiting Combination pulse by pulse & hiccup mode current limit High efficiency synchronous switching 1A peak current driver External soft start 12-pin MLP Lead-free package, fully WEEE and RoHS compliant Distributed power architecture Servers/workstations Local microprocessor core power supplies DSP and I/O power supplies Battery-powered applications Telecommunications equipment Data processing applications ‹ ‹ ‹ ‹ ‹ ‹ ‹ The SC4609 drives external, N-channel MOSFETs with a ‹ www.DataSheet4U.com peak gate current of 1A. A non-overlap protection is pro- ‹ vided for the gate drive signals to prevent shoot through of the MOSFET pair. The SC4609 features lossless current sensing of the voltage drop across the drain to source resistan...