ST A7987TR

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 V_IN. 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. Pulse-bypulse current sensing with digital frequency fold-back implements an effective constant current protection over the different application conditions. The peak current fold-back decreases the stress of the power components in heavy short-circuit conditions. The PGOOD open collector output can also implement the 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.

• 3 A DC output current
• 4.5 V to 61 V operating input voltage
• Adjustable f_SW (250 kHz to 1.5 MHz)
• Output voltage adjustable from 0.8 V to V_IN
• Synchronization
• Adjustable soft-start time
• Adjustable current limitation
• VBIAS 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

• Designed for 24 V automotive battery systems
• Industrial and commercial vehicles