Power Electronics / Power Management


Automotive switching regulator

26 June 2019 Power Electronics / Power Management

The STMicroelectronics A7987 automotive switching regulator has a wide input voltage range that allows use in trucks and buses, and an adjustable output voltage that ensures flexibility and stable performance to power the numerous voltage rails in automotive applications such as body infotainment and telematics.

With maximum input voltage of 61 V, the A7987 can operate from a 24 V battery in a conventional or hybrid/electric vehicle and maintain a regulated output despite disturbances such as load-dump. The output is adjustable from 0,8 V up to the input voltage, with low dropout, and can provide up to 3 A for a wide variety of loads from logic to lighting.

The current limit and switching frequency up to 1,5 MHz are set with external pull-down resistors, letting designers create compact power modules by optimising the output inductor size. Pulse-by-pulse current sensing with digital frequency foldback in short-circuit minimises stress on power components to enhance reliability. Thermal protection is built-in, with shutdown and auto-recovery to minimise reliance on external intervention.

The A7987 embeds a low-resistance N-channel power MOSFET. At light load, pulse skipping maintains output regulation and a bias-voltage input with integrated switchover allows powering analog circuitry from an external source for optimum efficiency.

A synchronisation pin allows up to five regulators to coexist by switching out of phase to avoid noise effects and reduce the RMS current flowing in the input capacitor. An enable pin and a power-good indicator with adjustable delay permit power-up sequencing. There is also an adjustable soft-start function to limit inrush current.

AEC-Q100 certified, the A7987 switching regulator is in production now, in a 5 x 6,4 mm HTSSOP16 exposed-pad package. ST has also released the STEVAL-ISA207V1 evaluation board, to accelerate new projects leveraging the A7987.

For more information contact EBV Electrolink, +27 21 402 1940, capetown@ebv.com, www.ebv.com



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