ZHCSDA7G July 2014 – February 2018 DRV10983
The DRV10983 includes a hysteretic step-down 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 (see Figure 4). The best efficiency is achieved when the step-down regulator is in buck mode. However, the DRV10983Z device (sleep mode version) only operates with the step-down regulator in linear mode and with a Zener diode as described in the Typical Application section. The regulator output voltage can be configured by register bit VregSel. When VregSel = 0, the regulator output voltage is 5 V, and when VregSel = 1, the regulator output voltage is 3.3 V. When the regulated voltage drops by the hysteresis level, the high-side FET turns on to increase the regulated voltage back to the target of 3.3 V or 5 V. The switching frequency of the hysteretic regulator is not constant and changes with the load.
If the step-down regulator is configured in buck mode, see IREG_MAX in the Electrical Characteristics to determine the amount of current provided for external load. If the step-down regulator is configured as linear mode, it is used for the device internal circuit only.
The DRV10983Z step-down regulator only operates in linear mode (using an external resistor) and with a Zener diode as described in the Typical Application section. The DRV10983Z device does not support buck mode (using an external inductor) as shown in Figure 4.
|Step-Down Regulator With External Inductor (Buck Mode)||Step-Down Regulator With External Resistor (Linear Mode)|