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RT8207 Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT8207 Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 22 page  RT8207 1 DS8207-07 March 2011 www.richtek.com Ordering Information 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. Complete DDRII/DDRIII Memory Power Supply Controller General Description The RT8207 provides a complete power supply for both DDRII/DDRIII memory systems. It integrates a synchronous PWM buck controller with a 3A sink/source tracking linear regulator and a buffered low noise reference. The PWM controller provides the high efficiency, excellent transient response, and high DC output accuracy needed for stepping down high-voltage batteries to generate low voltage chipset RAM supplies in notebook computers. The constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency. The RT8207 achieves high efficiency at a reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by its ability to drive very large synchronous rectifier MOSFETs. The buck conversion allows this device to directly step down high-voltage batteries for the highest possible efficiency. The 3A sink/source LDO maintains fast transient response only requiring 20 μF of ceramic output capacitance. In addition, the LDO supply input is available externally to significantly reduce the total power losses. The RT8207 supports all of the sleep state controls placing VTT at High-Z in S3 and discharging VDDQ, VTT and VTTREF (soft-off) in S4/S5. The RT8207 has all of the protection features including thermal shutdown and is available in the WQFN-24L 4x4 package. Features PWM Controller Resistor Programmable Current Limit by Low-Side RDS(ON) Sense Quick Load-Step Response within 100ns 1% VOUT Accuracy Over Line and Load Fixed 1.8V (DDRII), 1.5V (DDRIII) or Adjustable 0.75V to 3.3V Output Range Battery Input Range 2.5V to 26V Resistor Programmable Frequency Over/Under Voltage Protection 4 Steps Current Limit During Soft-Start Drives Large Synchronous-Rectifier FETs Power-Good Indicator 3A LDO (VTT), Buffered Reference (VTTREF) Capable to Sink and Source Up to 3A LDO Input Available to Optimize Power Losses Requires Only 20 μμμμμF Ceramic Output Capacitor Buffered Low Noise 10mA VTTREF Output Accuracy ±±±±±20mV for Both VTTREF and VTT Supports High-Z in S3 and Soft-Off in S4/S5 RoHS Compliant and Halogen Free Applications DDRII/DDRIII Memory Power Supplies Notebook Computers SSTL18, SSTL15 and HSTL Bus Termination Pin Configurations (TOP VIEW) WQFN-24L 4x4 VTTGND VTTSNS GND MODE VTTREF DEM PGND NC VDDP VDD PGOOD CS GND 1 2 3 4 5 6 78 9 10 12 11 18 17 16 15 14 13 21 20 19 24 22 23 25 RT8207 Package Type QW : WQFN-24L 4x4 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) |
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Similar Description - RT8207 |
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