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.

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

Applications
◆ Distributed power architecture
◆ Servers/workstations
◆ Local microprocessor core power supplies
◆ DSP and I/O power supplies
◆ Battery-powered applications
◆ Telecommunications equipment
◆ Data processing applications