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RT9643 Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT9643 Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 17 page  RT9643 1 DS9643-03 August 2007 www.richtek.com Features Integrated 5 Channels Power Regulator DC/DC Buck PWM Regulator for VDDQ (2.5V or 1.8V) Linear Regulator Supports 1.5Amp Peak Sinking/ Sourcing Capability for VTT 1.2V Ultra-Low-Dropout Linear Controller for GMCH VTT Power 3.3VSB Linear Regulator Supports 1.25A Capability 5VDL Switch Control 3VDL Switch Control Conform to ACPI Specification Support Power Management at S0, S3, and S5 State 300kHz Fixed Frequency Switching RDS(ON) Current Sensing or Optional Current Sense Resistor for Precision Over-Current Detect Embedded Synchronous Boot-Strapped Diode Power Good Signal Indication for All Voltages Thermal Shutdown 24-Lead VQFN Package RoHS Compliant and 100% Lead (Pb)-Free Applications DDR VDDQ and VTT Voltage Generator with ACPI Support Desktop System Power Servers System Power 5 Channel ACPI Regulator with Step-Down DC/DC Controller Ordering Information Pin Configurations (TOP VIEW) VQFN-24L 5x5 General Description The RT9643 is a combo regulator which is compliant to ACPI specification for desktop/motherboard power management and system application. The part features one switch regulator for DDR memory VDDQ power; three linear regulators including 1.5Amp peak sourcing/sinking capability regulator for DDR VTT, a 1.2V ultra-low-dropout linear controller for chipset miscellaneous power, a 3.3VSB power with 1.25Amp peak current capability; and 2 dual power control including 5VDL, and 3.3VDL control for S3 and S5 system power. The part totally feature 5 sets power which are compliant to ACPI specification into a single small footprint package VQFN-24L 5x5. The part is generally operated to conform to ACPI specification, in S3 state, there are only VDDQ and 3.3VSB regulators remain on while the VTT and ULDO regulators are off. In the transition from S3 to S0, an external SS capacitor is attached for linear regulators to control its slew rates respectively to avoid inrush current induced. Moreover, the PGOOD signal raises high in S0 stage while all 3 regulators go stable. In the stage of S5 (EN = 0), there only 3.3VSB LDO remain on, while the other regulators are powered down. The VDDQ PWM regulator is a voltage mode implementation with external compensation to provide high load transient response. The VTT is regulated to follow 1/2 of VDDQ and is capable of sourcing or sinking 1.5A peak currents. 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-24L 5x5 (V-Type) RT9643 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commer- cial Standard) 1.2V_DRV VTT_SNS VTT_OUT 5V_MAIN 5VSB_DRV 1.2V_FB VCC_EN PGOOD VCC 3VSB_OUT S3#I EN 1 2 3 4 5 6 17 16 15 14 13 789 10 12 11 18 22 21 20 19 24 23 GND 25 |
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