First Nvidia quad-phase PWM controller for Blackwell GPU

Alpha and Omega Semiconductor (AOS) has launched the world’s first quad-phase controller for Nvidia’s Blackwell GPUs.

The design of the AOZ73004CQI has received full OpenVReg (Open Voltage Regulator) OVR4-22 compliance.

The cycle-by-cycle current limit meets the overcurrent limit (OCL) specification that helps safely throttle GPU power for maximized performance and includes an external reference input and PWMVID dynamic output voltage control, which also follows the OVR4-22 specification.

The miltiphase PWM controller can minimize ripple effects, enabling the device to triple the PWMVID slew rate up to 30mV/us, which is required for next-generation GPUs. It also has deep-off and shallow-off power states to minimize power consumption, providing a significant advantage in battery-powered applications such as laptops with discrete GPUs and gaming laptops.

• 120kW liquid cooled Blackwell rack
• Blackwell is the start of a while new industry
• GPU roadmap with Rubin, HBM4 memory

The AOZ73004CQI can be paired with four DrMOS as a standard application to provide precise turn-on time with one PWM to drive two or three DrMOS devices. By doubling and tripling DrMOS, designers can create a high-power, cost-effective multiphase power solution that can achieve up to 12 power stages.

For AI server and graphic card applications powered by 12V input, AOS offers AOZ5310NQI-A DrMOS for the best GPU power efficiency. Similarly, the controller can pair with DrMOS power stages such as AOZ5316NQI/AOZ5317NQI/AOZ5318NQI, which are well-suited to laptop GPU powered by a 20V input. MOSFETs in DrMOS are TrenchFET, which further enhances OCL capability.

“AOS designs and manufactures multiphase PWM controller and power stage total solutions for our SoC customers to power AI server, Graphic, and Computing Core Power with the considerations of best system performance and reliability. AOZ73004CQI is a great example of our breakthrough control scheme that meets stringent power delivery requirements with minimum external components and the best system power efficiency in the world. The total solution can be quickly adopted by data center and computing customers with the reference design provided by the SoC supplier,” said Starry Tsai, Senior Product Marketing Director for Power IC at AOS.

 Differential remote sensing achieves a 1% regulated VOUT accuracy using a proprietary, high-performance AOS Advanced Transient Modulator (A2TM) control scheme with dynamic phase-to-phase current balancing.

The AOZ73004CQI is available in production quantities in a QFN 4×4-32L package and a lead time of 12-16 weeks. The unit price for AOZ73004CQI starts at $1.2 in 1,000-piece quantities.