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RT8857 Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT8857 Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 26 page  RT8857/A 1 DS8857/A-01 April 2011 www.richtek.com Ordering Information Note : VIN is the input voltage of MOSFET power stage. Richtek 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. 4/3/2/1-Phase PWM Controller with Embedded Drivers for CPU Core Power Supply General Description The RT8857/A is a 4/3/2/1-phase synchronous buck controller with 2 integrated MOSFET drivers for Intel VR11.1/VR10.x and AMD K8/K8_M2 CPUs power application. RT8857/A uses differential inductor DCR current sense to achieve phase current balance and active voltage positioning. Other features include adjustable operating frequency, adjustable soft start, power good indication, external error-amp compensation, over voltage protection, over current protection, VRHOT sensing and IMON for various applications. RT8857/A comes to a small footprint with WQFN-48L 7x7 package Features 12V Power Supply Voltage 4/3/2/1-Phase Power Conversion 2 Embedded MOSFET Drivers Internal Regulated 5V Output VID table for INTEL VR11.1/VR10.x and AMD K8/ K8_M2 CPUs Continuous Differential Inductor DCR Current Sense Adjustable Soft Start Adjustable Frequency Power Good Indication Adjustable Over Current Protection Over Voltage Protection VRHOT Sensing with External Thermistor IMON Output Current Indication Power State Indicator (PSI) Support MOSFET Power Stage Input Voltage (VIN) Down to 5V (RT8857A Only) Small 48-Lead WQFN Package RoHS Compliant and Halogen Free Pin Configurations WQFN-48L 7x7 (TOP VIEW) PWRGD PHASE1 UGATE1 PWM4 PWM3 BOOT2 UGATE2 PHASE2 LGATE2 LGATE1 VCC12 BOOT1 FBRTN SS/EN QR2 IMONFB IMAXPSI IMAX ADJ RT OFS COMP FB QR1 36 35 34 33 32 31 30 29 28 27 26 25 37 38 39 40 41 42 43 44 45 46 47 48 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 GND 49 Applications Desktop CPU Core Power Low Voltage, High Current DC/ DC Converter Package Type QW : WQFN-48L 7x7 (W-Type) RT8857/A Lead Plating System G : Green (Halogen Free and Pb Free) Support VIN : 5/12V Support VIN : 12V |
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