L6986H Synchronous Step-Down Switching Regulator

Release on : Jul 22, 2019

STMicroelectronics' L6986H Synchronous Step-Down Switching Regulator STMicroelectronics' L6986H device is a stepdown monolithic switching regulator able to deliver up to 2 A of output current.


The output voltage adjustability ranges from 0.85 V to VIN. There are two fixed voltage versions, 5 V and 3.3 V, which allow for saving external components and improving accuracy. The 100% duty cycle capability and the wide input voltage range allows high flexibility in different application conditions. The low consumption mode (LCM) maximizes the efficiency at light-load with controlled output voltage ripple. The low noise mode (LNM) makes the switching frequency constant and minimizes the output voltage ripple overload current range, meeting the low noise application requirements. The output voltage supervisor manages the reset phase for any digital load (μC, FPGA). The RST open collector output can also implement output voltage sequencing during the power-up phase. The synchronous rectification, designed for high efficiency at medium to heavy load, and the high switching frequency capability make the size of the application compact. Pulse by pulse current sensing on both power elements implements an effective constant current protection.


Low consumption mode with only 30 μA quiescent current
Low noise mode with forced PWM
Adjustable switching frequency from 250 kHz to 2 MHz
Adjustable or fixed output voltage (3.3 V and 5 V)
Embedded output voltage supervisor
Adjustable soft-start time
Overvoltage protection
DC conversion from 12 V and 24 V bus systems
Programmable logic controllers (PLCs)
Industrial sensors
Low power and low noise DC/DC conversion