STMicroelectronics A7987

The A7987 is a step-down monolithic switching regulator that can deliver up to 3 A DC. The adjustable output voltage ranges from 0.8 V to VIN. The wide input voltage range and the almost 100% duty cycle capability meet the fail-safe specifications for automotive systems. The embedded switch-over feature on the VBIAS pin maximizes efficiency at light load. The adjustable current limitation, 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.

Key features

• 3 A DC output current
• 4.5 V to 61 V operating input voltage
• Adjustable fsw (250 kHz to 1.5 MHz)
• Output voltage adjustable from 0.8 V to VIN

Additional features

• 3 A DC output current
• 4.5 V to 61 V operating input voltage
• Adjustable switching frequency (250 kHz to 1.5 MHz)
• Output voltage adjustable from 0.8 V to VIN
• Synchronization
• Adjustable soft-start time
• Adjustable current limitation
• V_BIAS improves efficiency at light load
• PGOOD open collector output
• Digital frequency fold-back in short-circuit
• Auto-recovery thermal shutdown
• Qualified following AEC-Q100 requirements

Applications

• 24 V automotive battery systems
• Industrial and commercial vehicles

Available tools

• STEVAL-ISA207V1:
  • 3 A step-down DC/DC switching regulator (VIN = 4.5 V to 60 V) based on the A7987
  • https://www.st.com/content/st_com/en/products/evaluation-tools/product-evaluation-tools/automotive-ic-eval-boards/steval-isa207v1.html