Description

SC4612 is a high performance synchronous buck controller that can be configured for a wide range of applications. The SC4612 utilizes synchronous rectified buck topology where high efficiency is the primary consideration. SC4612 is optimized for applications requiring wide input supply range and low output voltages down to 500mV.

SC4612 implements an asynchronous soft-start mode, which keeps the lower side MOSFET off during soft-start, a desired feature when a converter turns on into a preset external voltage or pre-biased output voltage. With the lower MOSFET off, the external bus is not discharged, preventing any disturbances in the start up slope and any latch-up of modern day ASIC circuits.

Features

■ Wide voltage range, VDD = 28V, VPWRIN = 40V

■ Internally regulated DRV

■ Output voltage as low as 0.5V

■ 1.7A gate drive capability

■ Asynchronous start up mode

■ Low side RDS-ON sensing with hiccup mode current limit

■ Programmable current limit

■ Programmable frequency up to 1.2 MHz

■ Available in MLPD-12 and SOIC-14 Lead-free packages. This product is fully WEEE and RoHS compliant

Applications

■ Distributed power architectures

■ Telecommunication equipment

■ Servers/work stations

■ Mixed signal applications

■ Base station power management

■ Point of use low voltage high current applications