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RT9237 Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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RT9237 Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers |
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1 / 15 page  Preliminary RT9237 DS9237-00 January 2002 www.richtek-ic.com.tw 1 Multi-Phase DC/DC Controller for CPU Core Power Supply General Description The RT9237 is a multi-phase buck DC/DC controller integrated with all control functions for high performance processor VRM. The RT9237 drives 2, 3 or 4 buck switching stages operating in interleaved phase set automatically. The multi-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. RT9237 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 RT9237 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. Applications Power Supply for Server and Workstation Power Supply for High Current Microprocessor Ordering Information RT9237 Features Multi-Phase Power Conversion with Automatic Phase Selection 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 Pin Configurations Part Number Pin Configurations RT9237CS (Plastic SOP-28) TOP VIEW Operating temperature range C: Commercial standard Package Type S : SOP-28 1 2 3 4 5 6 7 8 9 10 11 12 17 18 19 20 21 22 23 24 25 26 27 28 13 14 16 15 VID3 VID2 VID1 VID0 COMP FB ADJ GND VSEN VID4 DVD IMAX IRMP SS ISP4 VDD PGOOD PWM4 ISP1 PWM1 PWM2 ISP2 PWM3 ISN1 ISN2 ISP3 ISN3 ISN4 |
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