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About Coolstar

Coolstar Technology, Inc., a fabless semiconductor company, was founded in July 2014 in Sunnyvale, California. The company has raised three rounds of funding and established strong partnerships with the top foundry and tier-1 customers.

With its proprietary transistors and cutting-edge circuit designs, Coolstar presents power management solution breakthroughs that offer the highest efficiency with the smallest form factor.

Coolstar’s innovative solutions have a wide range of applications from the Internet of Things, mobile devices, cloud data centers and anywhere that needs power and wireless connectivity.  Coolstar’s technologies enable substantial power savings: extended battery life for mobile devices,  billions of dollars of energy cost savings for cloud data centers, and ultimately a greener  Earth.

LEAP to success

Coolstar Believes

L (love): passion to make our planet a better place to live
E (execution): key to turning ideas into reality
A (art of technology): foundation for breakthroughs
P (partner): industry eco-system support

are the four key factors for its LEAP to success.

Technology Overview

Technology Overview - Layers

Coolstar develops efficient power management solutions based on the vertical integration of proprietary devices, cutting-edge designs and customized passive components.

  • Transistor Level

    The foundation of the solutions is the proprietary transistor, the fastest power device in the industry.  Our elegant device structure and unique process technology platform simultaneously enables high efficiency, high frequency and high levels of integration.

  • Design Level

    Operating on the optimized process technology platform, Coolstar’s design team has the luxury of freedom to design the integrated circuits, pushing the limits of speed and power density while producing robust solutions.

  • Solution Level

    Customized inductors and system assembly are co-developed with strategic partners to achieve  harmonious end solutions that minimize parasitics and enhance the core technologies.


Coolstar offers power efficient solutions for two major applications:

Data Center


The migration of data processing to the cloud is fueling the quick expansion of data centers.  This market sector is expected to grow rapidly, driven by applications such as deep machine learning, self-driving cars, intelligent cities, voice and image recognition, etc.   Along with these advances come the challenges of increasingly high operation costs and heat  in today’s data centers, the major issues tackled by Coolstar’s power management solutions.

Our breakthrough process technologies coupled with cutting-edge designs bring 6X improvement in switching frequency and more than 75% power loss reduction. That enables a drastic decrease in the processors’ power consumption and saves billions of dollars in energy costs.

Mobile, Wearable and IoT


For mobile, wearable and IoT device applications, our technologies enable higher switching frequency allowing the use of much smaller passive components.  Along with versatile packaging techniques, Coolstar offers power solutions with a smaller footprint and lower profile. Compared to the state-of-the-art, our solutions increase power density by 3X.  Moreover, with more than 25% power loss reduction, Coolstar’s products help to extend battery life.

About Us

Management Team

Dr. Xiaotong Lin

Dr. Xiaotong Lin, CEO
Dr. Lin has been the CEO since Coolstar Technology was founded in 2014. Under her leadership, the company has raised three rounds of funding, hired top industry talent, and has now entered the pre-production phase.
From 2005 to 2014, Dr. Lin was a Senior Principle Scientist at Broadcom, responsible for ASIC architecture for Read Channel and Gigabits Ethernet chips. Before joining Broadcom, she was a Senior Member of Technical Staff in Bell Labs, Lucent Technologies. She has 10 granted patents.

Dr. Shuming Xu

Dr. Shuming Xu, President and CTO
Dr. Xu founded Coolstar Technology in 2014 and serves as the President and CTO.
Prior to that, he was a Chief Technologist at Texas Instrument after Ciclon Semiconductor Device Corporation was acquired by TI in 2009. Dr. Xu was the inventor of NexFET and co-founder of Ciclon Semiconductor. From 2001 to 2005, Dr. Xu was a Distinguished Member of Technical Staff in Bell Labs, Lucent Technologies. He has 60 granted patents.

Our Partners

Coolstar has a solid and reliable partnership with the top foundry in the world to manufacture our products. Coolstar has strong relationships with customers for optimal power solutions for a great variety of applications.

Our Investors

The company secured seed fund in 2014, series A fund in 2015 and pre-B fund in 2016, backed by top-tier venture capital firms and strategic corporate investors.

Contact Us

Coolstar Technology, Inc.
440 N Wolfe Road, Sunnyvale, CA 94085
(at Plug and Play Tech Center)
Tel: (408) 657-0608
Fax: (650) 276-7638

Email: contact@coolstartechnology.com

What is


Coolstar not only provides an innovative technology platform that enables disruptive power solutions for its customers; but provides a unique career development platform that attracts top industry talent and enables them to reach their greatest potential.

If you are a passionate professional who wants to join our exciting and adventurous journey, who has the ambition and faith to make cool products with tremendous differentiation from the state-of-the-art, who would like to pursue the happiness rewarded from hard and smart work, please contact us for available position openings.