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RT8802A Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT8802A Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 28 page  RT8802A 1 DS8802A-04 August 2007 www.richtek.com All brandname or trademark belong to their owner respectively 2/3/4/5-Phase PWM Controller for High-Density Power Supply General Description The RT8802Ais a 2/3/4/5-phase synchronous buck controller specifically designed to power Intel®/ AMD next generation microprocessors. It implements an internal 8-bit DAC that is identified by VID code of microprocessor directly. RT8802A generates VID table that conform to Intel® VRD10.x and VRD11 core power with 6.25mV increments and 0.5% accuracy. RT8802Aadopts innovative time-sharingDCR current sensing technique to sense phase currents for phase current balance, load line setting and over current protection. Using a common GM to sense all phase currents eliminates offset and linearity variation between GMs in conventional current sensing methods. As sub-milli-ohm-grade inductors are widely used in modern motherboards, slight offset and linearity mismatch will cause considerable current shift between phases. This technique ensures good current balance in mass production. Other features include over current protection, programmable soft start, over voltage protection, and output offset setting. RT8802A comes to a small footprint package with VQFN-40L 6x6. Features 5V Power Supply 2/3/4/5-Phase Power Conversion with Automatic Phase Selection 8-bit VID Interface, Supporting Intel VRD11/VRD10.x and AMD K8, K8_M2 CPUs VR_HOT and VR_FAN Indication Precision Core Voltage Regulation Power Stage Thermal Balance by DCR Current Sensing Adjustable Soft-start Over-Voltage Protection Adjustable Frequency and Typical at 300kHz per Phase Power Good Indication 40-Lead VQFN Package RoHS Compliant and 100% Lead (Pb)-Free Applications Intel®/AMDNew generation microprocessor for Desktop PC and Motherboard Low Output Voltage, High power density DC-DC Converters Voltage Regulator Modules Ordering Information Pin Configurations (TOP VIEW) VQFN-40L 6x6 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 QV : VQFN-40L 6x6 (V-Type) Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commer- cial Standard) RT8802A PWM5 PWM4 PWM3 PWM2 PWM1 ISP1 ISP2 ISP3 ISP4 ISP5 VTT/EN VR_Ready FBRTN FB COMP SS QRSEL VR_FAN VR_HOT TSEN 30 29 28 27 26 25 24 23 22 21 31 32 33 34 35 36 37 38 39 40 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 GND 41 |
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