描述 Description

The RT8800/B are general purpose multi-phase synchronous buck controllers dedicating for high density power supply regulation. The parts implement 2, and 3 buck switching stages operating in interleaved phase set automatically. The output voltage is regulated and controlled following the input voltage of FB pin. With such a single analog control, the RT8800/B provide a simple, flexible, wide-range and extreme cost-effective high-density voltage regulation solutions for various high-density power supply application. The RT8800/B multi-phase architecture provide high output current while maintaining low power dissipation on power devices and low stress on input and output capacitors. The high equivalent operating frequency also reduces the component dimension and the output voltage ripple in load transient.



RT8800/B implement both voltage and current loops to achieve good regulation, response and power stage thermal balance. The RT8800/B apply the time sharing DCR current sensing technology newly as well; with such a topology, the RT8800/B extract the DCR of output inductor as sense component to deliver a more precise load line regulation and better thermal balance capability. Moreover, the parts monitor the output voltage for over-current and over-voltage protection; Soft-start and programmable under-voltage lockout are also provided to assure the safety of power system.

特性 Features

? 5V Power Supply Voltage
? 2/3-Phase Power Conversion with Automatic Phase Selection (RT8800 : 2/3-Phase, RT8800B : 2-Phase)
? Output Voltage Controlled by External Reference Voltage
? Precise Core Voltage Regulation
? Power Stage Thermal Balance by DCR Current Sensing
? Extreme Low-Cost, Lossless Time Sharing Current Sensing
? Internal Soft-start
? Hiccup Mode Over-Current Protection
? Over-Voltage Protection
? Adjustable Operating Frequency and Typical at 300kHz Per Phase
? Power Good indication
? Small 16-Lead VQFN Package (For RT8800 only)
? RoHS Compliant and 100% Lead (Pb)-Free

應(yīng)用 Application

? Desktop CPU core power
? Low Output Voltage, High power density DC-DC Converters
? Voltage Regulator Modules