A7987 Asynchronous DC/DC Converter

By STMicroelectronics 56

A7987 Asynchronous DC/DC Converter

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

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