Description

SC4611 is a high performance synchronous buck controller that can be configured for a wide range of applications. The SC4611 utilizes synchronous rectified buck topologies where high efficiency is the primary consideration. It is optimized for applications involving multiple and redundant convertors connected together. The startup is asynchronous, which keeps the lower side FET off during soft start. This is a desired feature when a convertor is turned on with a preset external voltage or pre-bias voltage already present across its output. With the lower FET off, external bus is not discharged which avoids latch-up of modern ASIC circuits.

Features

Wide input range, 4.5 to 30V

Output voltage as low as 0.5V

2A output drive capability

Asynchronous start up mode

Multimode overcurrent protection with current limit, hiccup mode and latched shutdown

Overvoltage crowbar protection

Power OK signal

‹Programmable frequency up to 1 MHz with external synchronization

–40 to +85 degree C operating temperature

Thermal shutdown

Small package TSSOP-20