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The RT6321 is high efficiency synchronous step-down DC-DC converters with pseudo constant switching frequency 500kHz and deliver up to 12A output current. The RT6321 operates from 4.5V to 23V input voltage. The output voltage of RT6321 is programmed between 0.6V to 5.5V. The RT6321 supports low power mode (LPM) to dynamically change output voltage between target voltage and zero voltage.<br /><br />The RT6321 adopts Advanced Constant On-Time (ACOT<sup>&reg;</sup>) control architecture that provides ultra-fast transient response and further reduces the external component count. In steady states, the ACOT<sup>&reg;</sup> operates at nearly constant switching frequency over line, load and output voltage ranges and makes the EMI filter design easier.<br /><br />By setting the voltage of the EN/MODE pin, RT6321 operates either in diode emulation mode (DEM) or ultrasonic mode (USM) at light load. The USM maintains operation frequency above 25kHz, which eliminates the acoustic noise. In the DEM, RT6321 provides the best light-load efficiency and improves the acoustic noise with spread spectrum function.<br /><br />RT6321 provides PGOOD indicator for easy system sequence control. Full protection features are also integrated in the device, including the cycle-by-cycle current limit, OVP, UVP, input UVLO and OTP.<br /><br />All above functions are integrated in a UQFN-26L 4x3 (FC) package.
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  • 输入电压范围: 4.5V~23V
  • 输出电压: 0.6V~5.5V
  • 连续负载能力: 12A
  • 可与 POSCAP、MLCC 电容配合稳定工作
  • 快速瞬态响应
  • DEM 二极管仿真模式实现节能运行
  • USM 超声工作模式消除音频噪声
  • CCM 电流连续模式切换工作频率基本稳定于 500kHz
  • 低功耗模式 (LPM)
  • 内部集成 17mΩ/7.5mΩ MOSFET 功率开关
  • 过流保护: 14A/16A or 18A 可选
  • 输出欠压、过压保护
    ►RT6321A: 打嗝模式
    ►RT6321AH: 打嗝模式的欠压保护和非闭锁模式的过压保护
  • 输入欠压锁定保护
  • 过热保护
    ►RT6321A: 闭锁模式
    ►RT6321AH: 非闭锁模式
  • 接面温度范围: -40°C~125°C
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可擕式电脑 平板电脑 网络设备 服务器 视频录像机 平板电视和显示器 分布式电源系统
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