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