RT8105

RT8105 5V/12V Synchronous Buck PWM DC/DC Controller General Description The RT8105 is a high efficiency synchronous buck PWM controllers that generate logic-supply voltages in PC based systems. These high performance , single output devices include internal soft-start, frequency compensation networks and integrates all of the control, output adjustment, monitoring and protection functions into a single package. The device operating at fixed 300kHz frequency provides an optimum compromise between efficiency, external component size, and cost. Adjustable over-current protection (OCP) monitors the voltage drop across the RDS(ON) of the lower MOSFET for synchronous buck PWM DC/DC controller. The overcurrent function cycles the soft-start in 4-times hiccup mode to provide fault protection, and in an always hiccup mode for under-voltage protection. Features z z z z z Operating with 5V or 12V Supply Voltage Drives All Low Cost N-MOSFETs Voltage Mode PWM Control 300kHz Fixed Frequency Oscillator Fast Transient Response : ` High-Speed GM Amplifier ` Full 0 to 100% Duty Ratio Internal Soft-Start Adaptive Non-Overlapping Gate Driver Over-Current Fault Monitor on MOSFET, No Current Sense Resistor Required Full-Time Over Voltage Protection RoHS Compliant and Halogen Free z z z z z Applications z z z Ordering Information RT8105 Package Type S : SOP-8 Lead Plating System G : Green (Halogen Free and Pb Free) Z : ECO (Ecological Element with Halogen Free and Pb free) Note : Richtek prod...