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RT7220A是供反激式电源使用的高性能同步整流控制器,它通过检测MOSFET漏极电压决定同步整流开关的工作状态,可将关断过程的死区时间缩减至最小以提高效率,支持工作在电流连续模式、电流不连续模式和准谐振模式,可在3V~22V的输出电压范围内工作。
RT7220A内建高耐压线性稳压器,可在输出电压很低时提供足够的MOSFET驱动电压。它在轻载时以节能模式工作,可将工作电流降低至160μA以下,进入节能模式的时间点是通过对MOSFET门极驱动脉冲的计数来确定的。
建议的接面温度范围为-40°C至125°C,而环境温度范围则为-40°C至105°C。

应用

  • 使用快充协议 (如FCP、SCP、AFC和QC2.0/QC3.0) 的旅行充电器
  • 使用USB-C型接口、PD协议的旅行充电器
  • 网络通讯设备电源适配器
主要规格
RT7220AHC RT7220AHD RT7220AHF RT7220AHJ RT7220AMD
Status Active Active Active Active Active
Turn-On Threshold (V) 3.25 3.25 3.25 3.25 3.25
Turn-Off Threshold (V) 2.8 2.8 2.8 2.8 2.8
Operating Current (mA) 1 1 1 1 1
Green Mode Current (uA) 120 120 120 120 120
Maximum Input Voltage (V) 22 22 22 22 22
Maximum Operation Frequency (kHz) 150 150 150 150 100
Maximum VD Rating (DC Continue) (V) 120 120 120 120 120
Maximum VD Rating (Pulse width 500ns) (V) 130 130 130 130 130
HV LDO Current Capability (mA) 65 65 65 65 65
VG Total Turn-Off Delay Less than (ns) 30 30 30 30 30
Features Built-in HV LDO;Green Mode;High-Side SR Controller Of Flyback in CCM;DCM and Quasi-Resonant Mode+;Low-Side SR Controller Of Flyback in CCM;DCM and Quasi-Resonant Mode;VG Fast Turn-Off;VG Initial Output Low Clamping;VG Minimum Off-Time;VG Minimum On-Time;VG Output High Clamping Built-in HV LDO;Green Mode;High-Side SR Controller Of Flyback in CCM;DCM and Quasi-Resonant Mode+;Low-Side SR Controller Of Flyback in CCM;DCM and Quasi-Resonant Mode;VG Fast Turn-Off;VG Initial Output Low Clamping;VG Minimum Off-Time;VG Minimum On-Time;VG Output High Clamping Built-in HV LDO;Green Mode;High-Side SR Controller Of Flyback in CCM;DCM and Quasi-Resonant Mode+;Low-Side SR Controller Of Flyback in CCM;DCM and Quasi-Resonant Mode;VG Fast Turn-Off;VG Initial Output Low Clamping;VG Minimum Off-Time;VG Minimum On-Time;VG Output High Clamping Built-in HV LDO;Green Mode;High-Side SR Controller Of Flyback in CCM;DCM and Quasi-Resonant Mode+;Low-Side SR Controller Of Flyback in CCM;DCM and Quasi-Resonant Mode;VG Fast Turn-Off;VG Initial Output Low Clamping;VG Minimum Off-Time;VG Minimum On-Time;VG Output High Clamping Built-in HV LDO;Green Mode;High-Side SR Controller Of Flyback in CCM;DCM and Quasi-Resonant Mode+;Low-Side SR Controller Of Flyback in CCM;DCM and Quasi-Resonant Mode;VG Fast Turn-Off;VG Initial Output Low Clamping;VG Minimum Off-Time;VG Minimum On-Time;VG Output High Clamping
Package Type SOT-26 SOT-26 SOT-26 SOT-26 SOT-26
关键特性
  • 适用于反激式电源的低侧同步整流,支持CCM/DCM/准谐振模式
  • 适合3V~22V输出使用
  • 正常模式下电流消耗低于1.2mA(不包括驱动器消耗)
  • 节能模式下电流消耗低于160μA
  • 输出电压低于5V时由内建高压LDO为驱动电路供电
  • 用自适应跟踪控制优化效率
  • 最高工作频率:300kHz
  • 保护特性
    ►栅极驱动器有6V电压限制
    ►启动前栅极驱动器输出维持低电平状态
    ►可选最短时长保护
    ►可选同步整流最短关断时间
    ►VG快速关断(总延时低于35ns)
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