A Bondwire Inductor Based Flash ADC Assisted DC-DC Buck Converter

EasyChair Preprint no. 10887

Abstract

A Flash ADC-assisted fast transient response DC-DC buck converter is proposed in this paper. The proposed inductor-based DC-DC converter operates in continuous conduction mode (CCM). The novelty in architecture includes replacing SAR ADC with Flash ADC which converts the transient overshoot/undershoot into corresponding binary code at a faster rate as compared to SAR ADC. Depending on the overshoot and undershoot set criteria, the current pump injects the current into the output node to charge /discharge the output node to minimize the overshoot/undershoot and settling time. In the proposed design, required inductance is achieved by using bond-wire inductance, which reduces the chip's active area, and off-chip components. ADS simulations are performed for the estimation of inductor values using the QFN-64 package. The proposed DC-DC converter occupies an active area of 0.91 mm² using the TSMC 130 nm bulk CMOS process. Post layout simulation results show the peak efficiency of 84% at Vin of 3.3 V, Vout of 1.8 V with the load current I_L of 500 mA. The measured overshoot/undershoot in simulation is 70/60 mV with 530/469 ns recovery time and 7 mV output ripple. This enables the designed converter to be used in applications like aerospace, satellite, as well as military applications, where compactness is required.

Keyphrases: Bond wire based Inductor, Buck converter, Continuous Conduction Mode, DC-DC power converter, Flash ADC, IoT applications

@Booklet{EasyChair:10887,
  author = {Muhammad Jawad Shakil and Uzair Ahmad and Jafar Hussain and Hassan Saif and Rashad Ramzan},
  title = {A Bondwire Inductor Based Flash ADC Assisted DC-DC Buck Converter},
  howpublished = {EasyChair Preprint no. 10887},

  year = {EasyChair, 2023}}