A fully integrated power management ASIC for efficient inductive power transmission has been presented capable of automatic load transformation using a method, called Q-modulation. Q-modulation is an adaptive scheme that offers load matching against a wide range of loading $(R_{L})$ and coupling distance $(d_{23})$ variations in inductive links to maintain high power transfer efficiency (PTE). It is suitable for inductive powering implantable microelectronic devices (IMDs), recharging mobile electronics, and electric vehicles. In Q-modulation, the zero-crossings of the induced current in the receiver (Rx) LC-tank are detected and a low-loss switch chops the Rx LC-tank for part of the power carrier cycle to form a high-Q LC-tank and store the maximum energy, which is then transferred to $R_{L}$ by opening the switch. By adjusting the duty cycle $(D)$, the loaded-Q of the Rx LC-tank can be dynamically modulated to compensate for variations in $R_{L}$ . A Q-modulation power management (QMPM) prototype chip was fabricated in a 0.35 $\mu$m standard CMOS process, occupying 4.8 mm$^{2}$ . In a 1.45 W wireless power transfer setup, using a class-E power amplifier (PA) operating at 2 MHz, the QMPM successfully increased the inductive link PTE and the overall power efficiency by 98.5% and 120.7% at $d_{23} = $ 8 cm, respectively, by compensating for 150 $\Omega$ variation in $R_{L}$ at $D = $ 45%.