ZHCSH31B August 2017 – February 2018 DRV10987
The DRV10987 device includes a step-down hysteretic voltage regulator that can be operated as either a switching buck regulator using an external inductor or as a linear regulator using an external resistor. The best efficiency is achieved when the step-down regulator is in buck mode. The regulator output voltage is 5 V. When the regulated voltage drops by the hysteresis level, the high-side FET turns on to raise the regulated voltage back to the target of 5 V. The switching frequency of the hysteretic regulator is not constant and changes with load.
If the step-down regulator is configured in buck mode, see IREG_MAX_L in Electrical Characteristics to determine the amount of current provided for external load. If the step-down regulator is configured in linear mode, see IREG_MAX_R in Electrical Characteristics to determine the amount of current provided for external load. Active current ICC is higher in buck mode compared to linear mode.
|Step-Down Regulator With External Inductor (Buck Mode)||Step-Down Regulator With External Resistor (Linear Mode)|