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RT9241 Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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RT9241 Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers |
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1 / 13 page  Preliminary RT9241 DS9241-00 November 2001 www.richtek-ic.com.tw 1 Two-Phase DC/DC Controller for CPU Core Power Supply General Description The RT9241 is a two-phase buck DC/DC controller integrated with all control functions for high performance processor VRM. The RT9241 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. RT9241 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 RT9241 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. Ordering Information RT9241 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 200KHz) Times Channel Number Applications Power Supply for Server and Workstation Power Supply for High Current Microprocessor Pin Configurations Part Number Pin Configurations RT9241CS (Plastic SOP-20) TOP VIEW Operating temperature range C: Commercial standard Package Type S : SOP-20 1 2 3 4 5 6 7 8 9 10 13 14 15 16 17 18 19 20 12 11 VID3 VID2 VID1 VID0 COMP FB ADJ VSEN VID4 DVD SS VDD PGOOD ISP1 PWM1 PWM2 ISP2 ISN1 ISN2 GND |
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