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RT9248 Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT9248 Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 14 page  RT9248 Preliminary 1 DS9248-05 March 2007 www.richtek.com Multi-Phase PWM Controller for CPU Core Power Supply Ordering Information Features Multi-Phase Power Conversion with Automatic Phase Selection VRM9 & VRD10 DAC Output with Active Droop Compensation for Fast Load Transient Smooth VCORE Transition at VID Jump Multi-Level VID125 Input for VRM9 & VRD10 Selection Power Stage Thermal Balance by RDS(ON) Current Sense Hiccup Mode Over-Current Protection Programmable Switching Frequency (50kHz to 400kHz per Phase), Under-Voltage Lockout and Soft-Start High Ripple Frequency Times Channel Number RoHS Compliant and 100% Lead (Pb)-Free General Description The RT9248 is a multi-phase buck DC/DC controller integrated with all control functions for GHz CPU VRM. The RT9248 controls 2 or 3 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. RT9248 controls both voltage and current loops to achieve good regulation, response & power stage thermal balance. Precise current loop using RDS(ON) as sense component builds precise load line for strict VRM DC & transient specification and also ensures thermal balance of different power stages. The settings of current sense, droop tuning, VCORE initial offset 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 DAC output of RT9248 supports VRM9 & VRD10 by VID125 multi-level input, precise initial 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 micro- processor and power system. Applications Intel® Processors Voltage Regulator: VRM9 and VRD10 Low Output Voltage, High Current DC-DC Converters Voltage Regulator Modules Pin Configurations (TOP VIEW) TSSOP-28 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 VID4 VID3 VID2 VID1 VID0 VID125 SGND FB COMP PGOOD VCC PWM1 PWM2 PWM3 ISN1 ISP1 ISP2 ISP3 ISN23 GND DVD SS RT VOSS ADJ VDIF VSEN IMAX 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. Package Type C : TSSOP-28 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commer- cial Standard) RT9248 |
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