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RT9210PC Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT9210PC Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 17 page  RT9210 Preliminary DS9210-05 March 2007 1 www.richtek.com Applications DDR Memory Termination Supply SSTL_2 and SSTL_3 Interfaces Graph Card, Motherboard, Desktop Servers High Power Tracking DC-DC Regulators Dual 5V Synchronous Buck DC-DC PWM Controller for DDR Memory VDDQ and VTT Termination General Description The RT9210 is a dual high power, high efficiency synchronous buck DC-DC controller optimized for high performance double data rate (DDR) memory applications. It is designed to convert voltage supplies ranging from 4.5V to 5.5V into efficiently 2.5VDDQ for powering DDR memory, VTT for signal termination and a buffered amplifier for VREF reference. VTT tracks (VDDQ/2) to ±30mV, and VTT accurately tracks VREF. The RT9210 integrates all of the control, output adjustment, monitoring and protection functions into a single package. The VTT supply can be turned off independently of VDDQ during S3 sleep mode, the VTT output is maintained by a low power window regulator when V2_SD pin being triggered high. The RT9210 provides simple, single feedback loop, voltage mode control with fast transient response for VDDQ regulator. The VTT regulator features internal compensation that eases the circuitry design. It includes two phase- locked 300kHz sawtooth-wave oscillators which are placed 90° to minimize interference between the two PWM regulators. The RT9210 protects against over-current conditions by inhibiting PWM operation. It also monitors the current in the VDDQ regulator by using the RDS(ON) of the upper MOSFET which eliminates the need for a current sensing resistor. Features Operating with Single 5V Supply Voltage High Power VDDQ, VTT and VREF for DDR Memory VTT Tracks (VDDQ/2) to ±30mV VTT Regulator Internally Compensated Support “S3” Sleep Mode Drives All Low Cost N-MOSFETs Voltage Mode PWM Control 300kHz Fixed Frequency Oscillator Fast Transient Response : Full 0% to 100% Duty Ratio Internal Soft-Start Adaptive Non-Overlapping Gate Driver Over-Current Fault Monitor on VCC, No Current Sense Resistor Required RoHS Compliant and 100% Lead (Pb)-Free Pin Configurations (TOP VIEW) TSSOP-24 & SOP-24 UGATE1 BOOT1 PHASE1 VREF V2_SD OCSET/SD PVCC1 PGND1 FB1 COMP1 NC PGOOD SENSE1 LGATE1 SENSE2 VREF_IN GNDA VCC NC NC BOOT2 PGND2 LGATE2 UGATE2 4 5 6 19 20 21 7 8 9 16 17 18 10 11 12 13 14 15 2 3 22 23 24 Ordering Information 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. RT9210 Package Type C : TSSOP-24 S : SOP-24 Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commer- cial Standard) |
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