The RT8100A is an advanced DC/DC synchronous buck PWM controller with several innovative functions for specific customer' s ASIC only. The part features RichTek' s innovative design and topology say " analogous current mode" for current sensing and full functions for various applications including adjustable soft start, free-run and adjustable operation frequency and enable; the part is with design of 12V+12V boot strapped driver which is capable to drive up to 20Amp output current; moreover the part is with implementation of accuracy DCR current sensing topology. There are several specific features implemented and reserved for the specific customer ' s special applications including dual VCORE control mode including tracking and stand-alone mode, and output current indication. The part is proposed with a small footprint of VQFN-16L 3x3 package.