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
May 29, 2020
Each industry has its own standards and requirements that components must meet in order to be considered usable for that industry. There are some tests that are common between industries, such as outgassing, but more often than not there are going to be different requirements...
May 29, 2020
[From the last episode: We reviewed our tour of IoT and cloud computing.] We'€™ve talked about conventional computing, so now we'€™re going to look at a new computing application that'€™s taking the industry by storm: machine learning. We did a quick overview a long tim...
May 29, 2020
AI is all around us, but what is it exactly? For curious minds, this series of blogs explores the fundamental building blocks of AI, which together build the AI solutions we see today and that will enable the products we will enjoy tomorrow. This blog throws light on Supervis...
May 27, 2020
Could life evolve on ice worlds, ocean worlds, ocean worlds covered in ice, halo worlds that are tidally locked with their sun, and rogue worlds without a sun? If so, what sort of life might it be?...

Featured Video

DesignWare 112G Ethernet PHY IP Insertion Loss Capabilities

Sponsored by Synopsys

This video shows the performance results of the Synopsys 112G PHY receiver to varying amounts of channel insertion loss. The IP meets the standards requirements. With leading power, performance, and area, the IP is available in a range of FinFET processes for high-performance.

Click here for more information

Featured Paper

Choose the Ideal Bluetooth Protocol for Your Design

Sponsored by Maxim Integrated

Most people do not understand the difference between Bluetooth Low Energy and Bluetooth Basic Rate/Enhanced Data Rate. The emergence of Bluetooth 5 has further confused the landscape. This application note explains the differences and suggests ways to determine the best version for your design.

Click here to download the whitepaper