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    Hard- and Soft-Switched

    T40.3 - An Automotive-use 1MHz 48V AO2T Current Mode GaN LiDAR Boost Converter with Adaptive Transient Response and Temperature Compensated All-GaN Current Sensing

    Thursday, March 26, 2026
    11:00 AM - 11:20 AM CT
    Location: 217D
    In automotive LiDAR systems, boost converters are often used to obtain a high voltage. However, the intrinsic RHP zero and limited bandwidth restrict its response to load transient. Meanwhile, accurate current sensing is crucial for both the loop control in GaN boost converter and the pulse adjustment in LiDAR system. Traditional current sensing methods, like series-resistor sensing or VDS-sensing, either incurs high power loss or suffers from sensing inaccuracy due to the temperature coefficient mismatch between GaN and Si MOSFET. To address these challenges, this paper presents an automotive-use 1MHz 48V VOUT GaN LiDAR boost converter with AO2T control. It employs AO2T transient enhancer circuitry to achieve one-cycle response to load transient, and leverages TCAG-CS to realize high sensing accuracy across different temperatures and process corners as well as to maintain low power loss. For a load transient from 0.1A to 2.1A, the converter achieves VOUT undershoot of 112mV and one-cycle response with 5.4us recovery time. Thanks to the TCAG-CS, the design achieves high current sensing accuracy over wide temperature range, with sense error of 3.9% at -40°C and 2.5% at 125°C