Vrm 8.5 Pwm And Triple Linear Power System Controller

The RT9238 is a 4-in-one power controller optimized for high-performance Microprocessor and computer applications. The IC integrates a PWM Controller triple linear controller as well as monitoring and protection functions into a 28-pin SOP package. The PWM Controller regulates the Microprocessor core voltage with a synchronous buck converter. The first linear controller supplies the computer systems AGTL+ 1.2V bus power. The second linear controller provides power for the 1.5V AGP bus and the 3rd linear controller provides 1.8V power for the chipset core voltage and/or cache memory circuits. The RT9238 features an Intel VRM8.5 compatible, TTL 5-bit programmable DAC that adjusts the core voltage from 1.090V to 1.865V in 25mV steps. The 5- bit DAC has a typical 1% tolerance. The linear Regulators provide fixed output voltages of 1.2V (VOUT2), 1.5V (VOUT3) and 1.8V (VOUT4) or user- adjustable with an internal 1.265V reference. All the three linear Regulators drive external N-MOSFET or NPNs bipolar for the pass Transistor By Unkown