A Dual-Output Reconfigurable Shared-Inductor Boost-Converter/Current-Mode Inductive Power Management ASIC With 750% Extended Output-Power Range, Adaptive Switching Control, and Voltage-Power Regulation

This paper describes a dual-output, reconfigurable integrated power management (IPM) ASIC for inductive power delivery. The proposed ASIC operates either as a current-mode (CM) rectifier or a boost converter by sharing the receiver (Rx) coil (L
_Rx
) to improve performance of inductive power transmission against the variations of Rx input power (P
_Rx
) and dualoutput DC power (P
_L
+ P
_Hv
). Conventional IPM structures either fail to generate regulated outputs (e.g., V
_L
and V
_Hv
) when the required P
_L
+ P
_Hv
exceeds P
_Rx
or suffer from low powerconversion efficiency (PCE) when PRx exceeds P
_L
+ P
_Hv
due to voltage regulation and protection. To overcome these challenges, the proposed ASIC offers the unique capabilities of 1) generating multiple regulated outputs (V
_L
= 2.6 V, V
_Hv
= 3.9 V) directly from L
_Rx
with single-stage conversion, 2) efficient CM operation with active rectification, enabled by adaptive switching control (ASC), 3) charging a large capacitor (C
_S
) with the purpose of operating as a shared-inductor boost converter (SBC), transferring energy from C
_S
to C
_L
and C
_Hv
, when P
_Rx
<; P
_L
+ P
_Hv
, and 4) efficient voltage-power regulation (VPR). A proof-of-concept chip was fabricated in a 0.35-μm 2P4M standard CMOS process occupying 1.35-mm
²
active area. In measurements, the proposed ASIC was able to successfully provide regulated V
_L
= 2.6 V and V
_Hv
= 3.9 V despite significant variations in P
_Rx
, P
_L
, and P
_Hv
. Moreover, the chip extended the peak output power range by 750% and improved the PCE by 1.3 times and 8.1 times thanks to the ASC and VPR, respectively.