A Compact and Efficient 40 V Capacitive Level Shifter With Feedback Discharge Control
A Compact and Efficient 40 V Capacitive Level Shifter With Feedback Discharge Control for Enhanced CMTI and Low FoM for Bootstrapped Gate Drivers in BCD Technology
Abstract:
A high-speed, low-figure-of-merit capacitive floating level shifter (CF-LS) for high-side bootstrapped gate drivers is presented. The design integrates a feedback discharge control (FBDC) for enhanced V SW dV/dt (SRSW ) immunity and combines a mismatch reduction circuit (MMRC) with a common-mode blanking pulse (CMBP) to block common-mode (CM) signals with mismatch. Fabricated in a 0.75-µm STMicroelectronics bipolar-CMOS-DMOS (BCD) process, the proposed CF-LS occu-pies 0.048 mm2 with the core area being 0.026 mm2 , making it highly compact and integration-friendly. It achieves a propaga-tion delay (T P ) of 1.525 ns and transition energy (ET ) of 29.77 pJ at 40 V, both of which remain approximately constant across the V SW sweep from 0 to 40 V, while maintaining measured SRSW immunity of up to 20 V/ns and mismatch tolerance up to 30%. Compared to recent works, the design offers a 2× improvement in figure-of-merit2 (FoM2), achieving 2.68 ns·pJ/µm3 ·V at boot-strap supply (V BS ) of 5 V, and 3× improvement when supplied at 3.3 V. The CF-LS has been comprehensively validated both as a standalone circuit and when integrated within a dc–dc buck converter, making it a highly robust, efficient, and versatile solu-tion for high-frequency power management systems operating up to 55 MHz.
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A Compact and Efficient 40 V Capacitive Level Shifter With Feedback Discharge Control for Enhanced CMTI and Low FoM for Bootstrapped Gate Drivers in BCD Technology
