STMicro’s A7987 is a step down monolithic switching regulator able to deliver up to 3 ADC. The output voltage adjustability ranges from 0.8 V to VIN. The wide input voltage range and the nearly 100% duty cycle capability meet the fail-safe specifications for industrial systems. 

The embedded switchover feature on the VBIAS pin maximizes the efficiency at light load. The adjustable current limitation is designed to select the inductor RMS current in accordance with the nominal output current and the high switching frequency capability make the size of the application compact. Pulse by pulse current sensing with digital frequency foldback implements an effective constant current protection over the different application conditions. The peak current foldback decreases the stress of the power components in heavy short-circuit condition.

The PGOOD open collector output can also implement output voltage sequencing during the power-up phase. Multiple devices can be synchronized sharing the SYNCH pin to prevent beating noise for low noise requirements such as in infotainment applications.

Features

Ultra-low IQ-SHD (11 µA typ. from VIN)
Synchronization
Adjustable soft-start time
Adjustable current limitation
Low-dropout operation
VBIAS improves efficiency at light load
PGOOD open collector output
Output voltage sequencing

Applications

Designed for 24 V automotive battery systems
Industrial and commercial vehicles
Infotainment applications