SC4611 Datasheet | SEMTECH

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 star tup 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. Vcc supply, soft start, power-good signaling, high current gate drivers, bootstrapped supply for driving high side Nchannel MOSFETs, shoot through protection, frequency synchronization and the option for overvoltage crowbar. It also Features multi mode overload protection that includes continuous current limiting, hiccup mode followed by latch off. The user has the option of bypassing the hiccup mode and latch off the output if required. 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 ‹ ‹ SC4611 es with a rich set of Features like regulated ‹ ‹ ‹ ‹ ‹ ‹ ‹ Applications Distributed power architectures Telemunication equipment Servers/work stations Mixed signal applications Paralleled synchronous buck convertors Base station power management Typical Application Circuit VIN (30V MAX) QH Cin Lout Rcs QL 4 5 17 20 14 13 VOUT (0.5V MIN) VIN BD I AVC C BS T GDH PH 3 2 1 19 7 6 11 15 18 10 Cout S S /S H OS C S YN C CLM E AO FB P VC...