RT8802A的特性及应用 - 模拟电源 -

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2/3/4/5-Phase PWM Controller for High-Density Power Supply

The RT8802A is a 2/3/4/5-phase synchronous buck controller specifically designed to power Intel / AMD next generation microprocessors. It implements an internal 8-bit DAC that is identified by VID code of microprocessor directly. RT8802A generates VID table that conform to Intel VRD10.x and VRD11 core power with 6.25mV increments and 0.5% accuracy.

RT8802A adopts innovative time-sharing DCR current sensing technique to sense phase currents for phase current balance, load line setting and over current protection. Using a common GM to sense all phase currents eliminates offset and linearity variation between GMs in conventional current sensing methods. As sub-milli-ohm-grade inductors are widely used in modern motherboards, slight offset and linearity mismatch will cause considerable current shift between phases. This technique ensures good current balance in mass production.
Other features include over current protection, programmable soft start, over voltage protection, and output offset setting. RT8802A comes to a small footprint package with VQFN-40L 6x6.

Ordering Info

Note :
Richtek Pb-free and Green products are :
RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
100% matte tin (Sn) plating.

Features

5V Power Supply
2/3/4/5-Phase Power Conversion with Automatic Phase Selection
8-bit VID Interface, Supporting Intel VRD11/VRD10.x and AMD K8, K8_M2 CPUs
VR_HOT and VR_FAN Indication
Precision Core Voltage Regulation
Power Stage Thermal Balance by DCR Current Sensing
Adjustable Soft-start
Over-Voltage Protection
Adjustable Frequency and Typical at 300kHz per Phase
Power Good Indication
40-Lead VQFN Package
RoHS Compliant and 100% Lead (Pb)-Free

Application

Intel /AMD New generation microprocessor for Desktop PC and Motherboard
Low Output Voltage, High power density DC-DC Converters
Voltage Regulator Modules
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Pin Configurations
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