A 10-MHz DAB Hysteretic Control Switching Power Converter for 5G IoT Power Delivery

In this article, a 10-MHz switching power converter is introduced to satisfy stringent requirements on 5G mobile Internet-of-Things (IoTs) power delivery. To achieve nanosecond power flipping, the converter utilizes a double adaptive bound (DAB) hysteretic control to improve load transient performance. A synchronized dc resistance offset cancellation scheme is naturally embedded to enhance load regulation accuracy while retaining fixed frequency operation. The controller circuit can be easily reconfigured to achieve a power scalable operation, which facilitates the converter with adaptive system power delivery capability to achieve high efficiency over a wide power range. An integrated circuit prototype is fabricated using a 180-nm CMOS process with an active die area of 0.175 mm(2), achieving a peak power density of 14.3 W/mm(2). In response to 1 A/3 ns load increase/decrease between zero and maximum power, it achieves 1% settling time of 247 ns/387 ns with 31 mV/60 mV voltage droop, respectively. With a nominal switching frequency of 10 MHz, the switching frequency variations are controlled below 0.1% despite of the use of a hysteretic control. And the output regulation accuracy is improved with only 0.3% error. Thanks to the proposed power scalable reconfiguration and adaptive power delivery, the converter achieves above 80% efficiency over 99.9% of 2.5-W full power range with a peak efficiency of 91%.

Automated summary

This article introduces a 10-MHz switching power converter for 5G mobile Internet-of-Things applications, utilizing DAB hysteretic control and dc resistance compensation to achieve nanosecond power flipping and improved load regulation accuracy. The controller allows for power scalable operation and adaptive power delivery, resulting in high efficiency over a wide power range. The prototype achieved a peak power density of 14.3 W/mm(2) and settling times of 247 ns/387 ns with voltage droop of 31 mV/60 mV for load transitions. The converter demonstrated excellent performance with controlled switching frequency variations and improved output regulation accuracy.