STMicroelectronics Debuts STSR2 Smart Driver IC

STMicroelectronics Inc. (Geneva, Switzerland) announced its new STSR2 smart driver IC, which is designed for synchronous rectifiers that include specialized control circuitry to take advantage of the lower conduction losses offered by MOSFETs and boost the efficiency of power converter designs.

Available in SO-8 packages, the STSR2 provides two complementary, high-current outputs and is able to source 2A and sink 3.5A, to drive the power MOSFETs used as secondary synchronous rectifiers in high-efficiency forward topology with a low output voltage. The device features an internal oscillator, coupled with a smart clock detection mechanism, to maintain reliable switching operation even in light-load conditions. A built-on under-voltage lockout function ensures proper startup and avoids driving when the supply voltage drops.

An inhibit function allows the freewheeling MOSFET to be turned off during light-load conditions, enabling discontinuous conduction-mode and prevents the freewheeling MOSFET from sinking current from the load. The STSR2 operates from a 4.5V to 5.5V supply in the 20kHz to 750kHz frequency range.