This paper introduces a highly-miniaturized soft-switched power-supply suitable for IoT applications. It incorporates a half-bridge LLC resonant converter operating in the MHz range and a new hybrid PFM-PWM digital controller that facilitates tight output voltage regulation carried out through a simple voltage loop controller hardware. The switching frequency and the duty-ratio are adjusted simultaneously and with full continuity and monotonicity. Governed by two PI compensators to guarantee smooth and fast recovery from load-transient or input voltage aberrations the controller accounts for the non-monotonicity characteristics of asymmetrically driven LLC resonant converters. The operation of the controller is experimentally verified on a 3-7V input to 1.8V output HB-LLC converter, demonstrating tight output voltage regulation capabilities.