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RT9241APS Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT9241APS Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 17 page  RT9241A/B 1 DS9241AB-05 March 2007 www.richtek.com Features Two-Phase Power Conversion VRM 9.0 DAC Output with Active Droop Compensation for Fast Load Transient Precise Channel Current Sharing with Differential Sense Input Hiccup Mode Over Current Protection Programmable Under Voltage Lockout and Soft Start High Ripple Frequency, (Channel Frequency Times Channel Number) 100kHz Version (RT9241B) for Lower Switching Loss RoHS Compliant and 100% Lead (Pb)-Free Pin Configurations Applications Power Supply for Server and Workstation Power Supply for High Current Microprocessor Two-Phase DC/DC Controller for CPU Core Power Supply Ordering Information General 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 two- phase 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 component 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 compensation 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 (25mV/step) output with load current droop compensation 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. (TOP VIEW) SOP-20 VID4 VID3 VID2 VID1 VID0 COMP FB ADJ DVD SS ISN2 ISN1 GND VSEN ISP2 PWM2 PWM1 ISP1 PGOOD VDD 6 7 813 14 15 9 10 11 12 4 516 17 18 2 3 19 20 Note : RichTek Pb-free and Green products are : RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. 100%matte tin (Sn) plating. RT9241A/B Package Type S : SOP-20 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commer- cial Standard) Operating Frequency Version A : 200kHz B : 100kHz |
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