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RT8869A Dataheets PDF



Part Number RT8869A
Manufacturers Richtek
Logo Richtek
Description Advanced 2/1-Phase PWM Controller
Datasheet RT8869A DatasheetRT8869A Datasheet (PDF)

RT8869A Advanced 2/1-Phase PWM Controller for CPU Core Power General Description The RT8869A is an advanced 2/1-phase synchronous buck controller with 2 integrated MOSFET drivers. It integrates an 8-bit DAC that supports Intel VR11.x CPUs power application. The IC adopts state-of-the-art dynamic phase control capability by PS1 pin and achieves high efficiency over a wide load range. It uses lossless RDS(ON) current sensing to achieve phase current balance. Other features include adjustable ope.

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RT8869A Advanced 2/1-Phase PWM Controller for CPU Core Power General Description The RT8869A is an advanced 2/1-phase synchronous buck controller with 2 integrated MOSFET drivers. It integrates an 8-bit DAC that supports Intel VR11.x CPUs power application. The IC adopts state-of-the-art dynamic phase control capability by PS1 pin and achieves high efficiency over a wide load range. It uses lossless RDS(ON) current sensing to achieve phase current balance. Other features include adjustable operating frequency, adjustable soft-start, short circuit protection, adjustable over current protection, over voltage protection, under voltage protection, power good indication, VR_HOT indication and VR_SHDN indication. The RT8869A is available in a small footprint with WQFN40L 5x5 package. Ordering Information RT8869A Package Type QW : WQFN-40L 5x5 (W-Type) Lead Plating System Z : ECO (Ecological Element with Halogen Free and Pb free)) Note : 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. Marking Information RT8869A ZQW YMDNN RT8869AZQW : Product Number YMDNN : Date Code Features z 12V Power Supply Voltage z 2/1-Phase Power Conversion z Integrated 2 MOSFET Drivers with Internal Bootstrap Diode z Dynamic Phase Control Capability z 8-bit DAC Supports Intel VR11.x CPUs z Lossless RDS(ON) Current Sensing for Current Balance z Adjustable Frequency : 50kHz to 1MHz z Adjustable Over Current Protection z Adjustable Soft-Start z VR_RDY, VR_HOT and VR_SHDN Indications z Small 40-Lead WQFN Package z RoHS Compliant and Halogen Free Applications z Desktop CPU Core Power z Middle/High End Graphic Cards z Low Voltage, High Current DC/ DC Converters Pin Configurations (TOP VIEW) FBRTN VID0 VID1 VID2 VID3 VID4 VID5 VID6 VID7 BOOT1 40 39 38 37 36 35 34 33 32 31 VRSEL 1 30 VR_RDY 2 29 SS 3 28 EN 4 27 DAC 5 EAP 6 GND 26 25 FB 7 24 COMP 8 CSP 9 CSN 10 41 23 22 21 11 12 13 14 15 16 17 18 19 20 UGATE1 PHASE1 LGATE1 VCC12A VCC12B LGATE2 PHASE2 UGATE2 BOOT2 VR_HOT IMAX VR_SHDN PS1 ISEN2 ISEN1 RT VCC5 TB VOUT TM WQFN-40L 5x5 DS8869A-00 May 2011 www.richtek.com 1 www.richtek.com 2 DS8869A-00 May 2011 VSHDN VVR_SHDN PH1 PH2 VCC5 R18 R19 C1 C23 RT8869A 17 VCC5 IMAX 11 R2 VIN 4.5V to 13.2V Q9 NTC2 R1 R20 R21 20 TM CSN+ NTC1 RPS1 12 VR_SHDN 13 PS1 C17 R23 R30 R31 C5 R24 10 CSN 9 CSP Chip Enable VTT VVR_HOT R17 4 EN 21 VR_HOT RRT 16 RT VCC_SNS R29 18 TB C26 R15 12V 27 VCC12A C15 R16 26 VCC12B C16 41 (Exposed Pad) GND BOOT1 31 UGATE1 30 PHASE1 29 R3 C2 R4 C3 Q1 L1 LGATE1 28 ISEN1 15 DAC 5 EAP 6 R5 R6 Q2 R38 R40 C7 CSN+ VID[7:0] 32 to 39 C4 VRSEL 1 VR_RDY 2 VVR_RDY VIN 4.5V to 13.2V VTT R35 BOOT2 22 R7 C5 C6 C29 UGATE2 23 PHASE2 24 R8 Q3 L2 LGATE2 25 ISEN2 14 VOUT 19 FB 7 COMP 8 FBRTN 40 SS 3 R9 Q4 R37 R41 C30 C8 CSN+ C9 R10 C10 R11 C11 R12 C33 C12 C13 C14 VCORE C34 LOAD R13 R14 VCC_SNS VSS_SNS RT8869A Typical Application Circuit RT8869A Table 1. VR11.1 VID Code Table VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 Voltage VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 Voltage 0 0 0 0 0 0 0 0 OFF 0 0 1 0 0 0 1 1 1.39375 0 0 0 0 0 0 0 1 OFF 0 0 1 0 0 1 0 0 1.38750 0 0 0 0 0 0 1 0 1.60000 0 0 1 0 0 1 0 1 1.38125 0 0 0 0 0 0 1 1 1.59375 0 0 1 0 0 1 1 0 1.37500 0 0 0 0 0 1 0 0 1.58750 0 0 1 0 0 1 1 1 1.36875 0 0 0 0 0 1 0 1 1.58125 0 0 1 0 1 0 0 0 1.36250 0 0 0 0 0 1 1 0 1.57500 0 0 1 0 1 0 0 1 1.35625 0 0 0 0 0 1 1 1 1.56875 0 0 1 0 1 0 1 0 1.35000 0 0 0 0 1 0 0 0 1.56250 0 0 1 0 1 0 1 1 1.34375 0 0 0 0 1 0 0 1 1.55625 0 0 1 0 1 1 0 0 1.33750 0 0 0 0 1 0 1 0 1.55000 0 0 1 0 1 1 0 1 1.33125 0 0 0 0 1 0 1 1 1.54375 0 0 1 0 1 1 1 0 1.32500 0 0 0 0 1 1 0 0 1.53750 0 0 1 0 1 1 1 1 1.31875 0 0 0 0 1 1 0 1 1.53125 0 0 1 1 0 0 0 0 1.31250 0 0 0 0 1 1 1 0 1.52500 0 0 1 1 0 0 0 1 1.30625 0 0 0 0 1 1 1 1 1.51875 0 0 1 1 0 0 1 0 1.30000 0 0 0 1 0 0 0 0 1.51250 0 0 1 1 0 0 1 1 1.29375 0 0 0 1 0 0 0 1 1.50625 0 0 1 1 0 1 0 0 1.28750 0 0 0 1 0 0 1 0 1.50000 0 0 1 1 0 1 0 1 1.28125 0 0 0 1 0 0 1 1 1.49375 0 0 1 1 0 1 1 0 1.27500 0 0 0 1 0 1 0 0 1.48750 0 0 1 1 0 1 1 1 1.26875 0 0 0 1 0 1 0 1 1.48125 0 0 1 1 1 0 0 0 1.26250 0 0 0 1 0 1 1 0 1.47500 0 0 1 1 1 0 0 1 1.25625 0 0 0 1 0 1 1 1 1.46875 0 0 1 1 1 0 1 0 1.25000 0 0 0 1 1 0 0 0 1.46250 0 0 1 1 1 0 1 1 1.24375 0 0 0 1 1 0 0 1 1.45625 0 0 1 1 1 1 0 0 1.23750 0 0 0 1 1 0 1 0 1.45000 0 0 1 1 1 1 0 1 1.23125 0 0 0 1 1 0 1 1 1.44375 0 0 1 1 1 1 1 0 1.22500 0 0 0 1 1 1 0 0 1.43750 0 0 1 1 1 1 1 1 1.21875 0 0 0 1 1 1 0 1 1.43125 0 1 0 0 0 0 0 0 1.21250 0 0 0 1 1 1 1 0 1.42500 0 1 0 0 0 0 0 1 1.20625 0 0 0 1 1 1 1 1 1.41875 0 1 0 0 0 0 1 0 1.20000 0 0 1 0 0 0 0 0 1.41250 0 1 0 0 0 0 1 1 1.19375 0 0 1 0 0 0 0 1 1.40625 0 1 0 0 0 1 0 0 1.18750 0 0 1 0 0 0 1 0 1.40000 0 1 0 0 0 1 0 1 1.18125 DS8869A-00 May 2011 To be continued www.richtek.com 3 RT8.


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