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RT9644 Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT9644 Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 17 page  Preliminary 1 DS9644/A-01 August 2007 www.richtek.com RT9644/A ACPI Regulator/Controller for Dual Channel DDR Memory Systems General Description The RT9644/A is a complete ACPI compliant power solution for DDR and DDR2 memory system with up to 4 DIMMs dual channel systems. This RT9644 includes one synchronous buck controller for DDR/DDR2 VDDQ, one DDR/DDR2 bus terminator VTT (equal to VDDQ/2) regulator with source and sinking ability, three LDO controllers for VGMCH (cascode), and GMCH/CPU terminat ion VTT_GMCH/CPU. The RT9644A includes one synchronous buck controller for DDR/DDR2 VDDQ, one PWM controller for VGMCH (with external MOSFET driver), one DDR/DDR2 bus terminator VTT (equal to VDDQ/2) regulator with source and sinking ability, and two LDO controllers for VTT_GMCH/CPU and VDAC. These parts also provide a reference buffer for DDR/DDR2 input reference voltage generator. When during S0 state, the VIDPGD indicates the GMCH_CPU VTT within spec and operational. The synchronous buck DC-DC PWM is implemented by two N-MOSFETs as upper and lower MOSFETs with voltage mode control. The linear controllers are implemented with one N-MOSFET with suitable capacitance. Each output is monitored by under voltage protection (RT9644 except VGMCHH and RT9644A except VDAC). VDDQ PW M controller and DDR/DDR2 bus terminator regulator have over voltage protection. Moreover, the VDDQ PWM controller has the over current protection by external resister adjustment. Thermal shut down is integrated. All the internal voltage reference is fixed at 0.8V, and users can adjust the resistance divider for desired voltage output. Features l RT9644 Includes Three LDO Controllers, One LDO Regulator and One PWM Controller }One DDR/DDR2 VDDQ with Synchronous Buck PWM }One DDR/DDR2 Bus Terminator VTT Regulator Source/Sink 3A }Two Cascode LDO Controllers for GMCH Core }One LDO Controller forGMCH/CPU Bus Terminator VTT_GMCH/CPU l RT9644A Includes Two LDO Controllers, One LDO Regulator and Two PWM Controllers }One DDR/DDR2 VDDQ with Synchronous Buck PWM }One VGMCH with External Richtek MOSFET Driver }One DDR/DDR2 Bus Terminator VTT Regulator Source/Sink 3A }One LDO Controller for VDAC } One LDO Controller for GMCH/CPU Bus Terminator VTT_GMCH/CPU l Operating with 5V and 12V Supply Voltage l ACPI Compliant Sleep Mode Control l Drive All Low Cost N-MOSFETs l Voltage Mode PWM Control }250kHz Fixed Frequency Oscillator (RT9644A: Two PWM controllers with phase shift 90o) }Simple Voltage Mode Loop Control }Fast Transient Response }Over Current Protection l Fully Adjustable Output Voltage Down to Compatible with DDR2 l Integrated DDR/DDR2 Reference Buffer l Integrated VIDPGD to Indicated VTT_GMCH/CPU Operational l All Regulator Outputs Monitored by Under Voltage Protection l DDR/DDR2 VDDQ and Bus Terminator VTT Also Integrated Over Voltage Protection l Integrated Thermal Shut Down l RoHS Compliant and 100% Lead (Pb)-Free Applications l Motherboard, Desktop Servers : Single/Dual channel DDR/DDR2 ACPI compliant l Graphic Card : GPU and memory supply l IA Equipments l Telecomm Equipments l DSP, ASIC or embedded processor and IO supplies l High Power DC-DC Regulators |
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