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The RT8127A is a high efficiency Dual-Channel output synchronous Buck PWM controller with integrated MOSFET drivers and two LDOs. This part features Green Voltage Mode (GVM<sup>TM</sup>) control, which is specifically designed to improve efficiency at light load condition. At light load condition, the RT8127A is pin configurable to automatically operate in diode emulation mode with constant on-time PFM to reduce switching frequency so as to improve conversion efficiency. As the load current increases, the RT8127A leaves the diode emulation mode and operates in Continuous Conduction Mode (CCM) with fixed-frequency, 180&deg; out of phase interleaved PWM to reduce input capacitance. The RT8127A supports 4.5V to 26V input voltage range and has integrated 5V LDO which supplies the internal gate drivers as well as the controller. When channel 1 Buck regulator output voltage is higher than 5V, the supply voltage will be automatically switched to the Buck regulator output from the integrated 5V LDO. The RT8127A supports enable/disable function for each channel and also features external soft-start, adjustable switching frequency and power good indication. This device utilizes lossless inductor DCR current sensing for over current protection. Other protections include over voltage, under voltage, thermal shutdown and under voltage lockout. <p align="justify">The RT8127A is available in a WQFN-28L 4x4 small footprint package.</p>
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  • 绿能电压模式(GVM™)控制
  • 轻载高效率
  • 在轻载输出时自动切换为省略模式(ASM)
  • 可由脚位控制切换CCM/DEM 操作
  • 在CCM操作时180°的错相PWM控制
  • 支持4.5V 至26V输入电压范围
  • 整合5V MOSFET 驱动器以及自举电路
  • 整合5V与12V的 LDO
  • 提供各通道的 致能/关闭 功能
  • 外部/内设 的缓启动控制
  • 可调的LGATE PWM 频率设定(LGFS)
  • 可自动切换的5V 调节器
  • 电源良好信号指示
  • VIN 前向回馈的控制回路
  • 无损耗的电感DCR电流感测
  • 支持过电压、低电压、过电流保护、过热关机与过低电压闩锁功能
  • 过电压、低电压、过热关机与过低电压闩锁功能
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Motherboard, Server, Graphic Card System Power Supplies Power Module
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