RT9241B Datasheet | Richtek

Description The RT9241A/B is a two-phase buck DC/DC controller integrated with all control functions for high performance processor VRM. The RT9241A/B drives 2 buck switching stages operating in 180 degree phase shift. The twophase architecture provides high output current while maintaining low power dissipation on power devices and low stress on input and output capacitors. The high equivalent operating frequency also reduces the ponent dimension and the output voltage ripple in load transient. RT9241A/B regulates both easily set voltage and current loops. Precise current sharing for power stage is achieved by differential input current sense and processing circuit. The settings of current sense, droop tuning and over current protection are independent to pensation circuit of voltage loop. The feature greatly facilitates the flexibility of CPU power supply design and tuning. The RT9241A/B uses a 5-bit DAC of 1.1V to 1.85V (25m V/step) output with load current droop pensation to meet the strict VRM transient requirement. The IC monitors the VCORE voltage for PGOOD and over voltage protection. Soft start, over current protection and programmable under voltage lockout are also provided to assure the safety of microprocessor and power system. Ordering Information RT9241A/B Package Type S : SOP-20 Operating Temperature Range P : Pb Free with mercial Standard G : Green (Halogen Free with mercial Standard) Operating Frequency Version A : 200k Hz B : 100k Hz Note : Rich Tek Pb-free and Green 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. DS9241AB-05 March 2007 Features z Two-Phase Power Conversion z VRM 9.0 DAC Output with Active Droop pensation for Fast Load Transient z Precise Channel Current Sharing with Differential Sense Input z Hiccup Mode Over Current Protection z Programmable Under Voltage Lockout and Soft Start z High Ripple...