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RT9245BGC Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT9245BGC Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 23 page  RT9245B 1 DS9245B-02 March 2007 www.richtek.com Multi-Phase PWM Controller for K8 CPU Core Power Supply General Description RT9245B is a multi-phase buck DC/DC controller integrated with all control functions for AMD K8 CPU. The RT9245B could be operated with 2, 3 or 4 buck switching stages operating in interleaved phase set automatically. The multiphase architecture provides high output current while maintaining low power dissipation on power devices and low stress on input and output capacitors. The high equiv alent operating frequency also reduces the component dimension and the output voltage ripple in load transient. RT9245B implements both voltage and current loops to achieve good regulation, response and power stage thermal balance. RT9245B applies the DCR sensing technology newly. The RT9245B extracts the ESR of output inductor as sense component to deliver a precise load line regulation and good thermal balance for next generation processor application. Current sense setting, droop tuning, VCORE initial offset and ov er current protection are independent on compensation circuit of voltage loop. The feature greatly facilitates the flexibility of CPU power supply design and tuning. The DAC output of RT9245B supports AMD K8 6-bit VID, precise offset value & smooth VCORE transient at VID jump. 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. The RT9245B comes to a small footprint package TSSOP-28. Features l Multi-Phase Power Conversion with Automatic Phase Selection l 6-bit AMD K8 M2 DAC Output with Active Droop Compensation for Fast Load Transient l Smooth VCORE Transition at VID Jump l Power Stage Thermal Balance by DCR Current Sense l Hiccup Mode Over-Current Protection l Programmable Switching Frequency (50kHz to 400kHz per Phase), Under-Voltage Lockout and Soft- Start l High Ripple Frequency Times Channel Number l 28-TSSOP Package l RoHS Compliant and 100% Lead (Pb)-Free Applications l AMD K8 Processors Voltage Regulator l Low Output Voltage, High Current DC-DC Converters l Voltage Regulator Modules Pin Configurations (TOP VIEW) TSSOP-28 Ordering Information 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. VID4 VID3 VID2 VID1 VID0 VID5 SGND FB COMP PGOOD VCC PWM1 PWM2 PWM3 PWM4 CSP4 CSP2 CSP3 CSP1 GND DVD SS RT VOSS ADJ IOUT CSN IMAX 6 7 8 21 22 23 9 10 11 18 19 20 12 13 14 16 15 17 4 5 24 25 26 2 3 27 28 RT9245B Package Type C : TSSOP-28 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commer- cial Standard) |
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