industry news
Subscribe Now

STMicroelectronics’ New Switching Regulator with Wide Voltage Ranges Adds Robustness and Flexibility in Automotive Applications

Geneva, June 25, 2019 — 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 61V, the A7987 can operate from a 24V battery in a conventional or hybrid/electric vehicle and maintain a regulated output despite disturbances such as load-dump. The output is adjustable from 0.8V up to the input voltage, with low dropout, and can provide up to 3A for a wide variety of loads from logic to lighting.
 
The current limit and switching frequency up to 1.5MHz are set with external pulldown resistors, letting designers create compact power modules by optimizing the output-inductor size. Pulse-by-pulse current sensing with digital frequency foldback in short-circuit minimizes stress on power components to enhance reliability. Thermal protection is built-in, with shutdown and auto-recovery to minimize 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 synchronization 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 5mm x 6.4mm HTSSOP16 exposed-pad package, priced from $2.00 for orders of 1000 pieces.
 
ST has also released the STEVAL-ISA207V1 evaluation board, available now from www.st.com or distributors, to accelerate new projects leveraging the A7987.
 
Please visit www.st.com/a7987-pr for further information.

Leave a Reply

featured blogs
Jul 15, 2019
Cadence sponsors several different tech conferences throughout the year. We use these events as an opportunity to allow employees to take a day out of our normal work routine to network, learn, and... [[ Click on the title to access the full blog on the Cadence Community sit...
Jul 11, 2019
This is the first of a two-part article outlining the restoration of the Apollo Guidance Computer (AGC), and Samtec'€™s participation in the process, to commemorate the 50th anniversary of the Apollo 11 landing. If you'€™re like me, you'€™re watching and reading about t...
Jan 25, 2019
Let'€™s face it: We'€™re addicted to SRAM. It'€™s big, it'€™s power-hungry, but it'€™s fast. And no matter how much we complain about it, we still use it. Because we don'€™t have anything better in the mainstream yet. We'€™ve looked at attempts to improve conven...