STMicroelectronics introduced L3751 synchronous step-down controller with compact size and input voltage range of 6V to 75V, which is applicable to various application fields from industrial equipment to pure electric light vehicles. This 3.5mm x 4.5mm controller is also suitable for common 24V and 48V telecom and network equipment.
The minimum conduction time of the L3751 is 40ns, which supports an extremely low duty cycle, allowing a large voltage drop ratio, allowing designers to directly supply power to low-voltage equipment without using intermediate power converters. This helps simplify application circuit design and reduce bill of materials (BOM) costs. The device integrates a 7.5V grid driver power supply. In addition to the wide range of power supply voltage, the L3751 can withstand 100V input voltage and can work in harsh electrical environments. The switching frequency can be adjusted in the range of 100kHz to 1MHz, so designers can flexibly select external MOSFETs and passive components to optimize circuit size, performance and cost.
In order to improve energy efficiency and minimize ripple current, L3751 adopts diode simulation mode and has pulse jumping function under light load. The L3751 provides comprehensive electrical protection functions for applications, including overheat protection, input undervoltage lockout, burp mode constant current protection, and programmable current detection. The product also has an external enabling pin and a good indicator of open collector power supply. The STEVAL-L3751V12 100W evaluation board can help designers speed up device selection during power development.
