RT9226B Datasheet | Richtek

Preliminary Synchronous PWM Step-Down DC/DC Converter Controller General Description The RT9226B is a low cost, high-efficiency voltage-mode PWM controller for motherboard power supply application. Synchronous N-Channel MOSFET driver, short-circuit protection, and soft start function are integrated in a single chip. A simple high power buck regulator with shutdown function can be implemented with minimum external ponents. The RT9226B provides current-limit protection by monitoring the voltage drop across N-Channel MOSFET in over current condition, therefore, eliminates the current sensing resistor and minimizes the efficiency loss. The soft start function reduces the stress on power supply and ponents in power on duration. The 200k Hz operating frequency and high speed PWM control loop with Synchronous N-Channel MOSFET driver provide optimized promise between efficiency, cost, and response speed. Other Features include output voltage monitoring for power good indication and over voltage protection. Ordering Information Package Type S : SOP-14 Operating Temperature Range C : mercial Standard P : Pb Free with mercial Standard Note : Rich Tek Pb-free products are : - Ro HS pliant and patible with the current requirements of IPC/JEDEC J-STD-020. - Suitable for use in Sn Pb or Pb-free soldering processes. - 100%matte tin (Sn) plating. Features z Synchronous N-Channel MOSFET Driver z High Efficiency z Fast Response with 200k Hz Operating Frequency z Adjustable Current Limit by Sensing MOSFET RDS(ON), without Extra Current Sensing Resistor z Shutdown Function z Power Good Indication Output and Over-Voltage Protection z Ro HS pliant and 100% Lead (Pb)-Free Applications z Low Cost CPU Power Supply z Motherboard I/O Power Supply z Add-On Card Power Supply z DDR SDRAM Bus Terminator Power Supply Pin Configurations (TOP VIEW) VSEN OCSET SS FB EN GND PGNDH 14 2 13 3 12 4 11 5 10 69 78 SOP-14 VCC LGATE PGNDL BOOT UGATE PHASE...