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The RT8205L/M is a dual step-down, switch mode power supply controller generating logic-supply voltages in battery powered systems. It includes two Pulse-Width Modulation (PWM) controllers adjustable from 2V to 5.5V, and also features fixed 5V/3.3V linear regulators. Each linear regulator provides up to 100mA output current with automatic linear regulator bootstrapping to the PWM outputs. An optional external charge pump can be monitored through SECFB (RT8205M). The RT8205L/M includes on-board power up sequencing, a power good output, internal soft-start, and internal soft-discharge output that prevents negative voltage during shutdown.
The constant on-time PWM control scheme operates without sense resistors and provides 100ns response to load transient response while maintaining nearly constant switching frequency. To eliminate noise in audio applications, an ultrasonic mode is included, which maintains the switching frequency above 25kHz. Moreover, the diode-emulation mode maximizes efficiency for light load applications. The RT8205L/M is available in a WQFN-24L 4x4 package.
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  • 采用 COT 控制架构，具有 100ns 负载瞬态变化响应能力
  • 宽输入电压范围：6V~25V
  • 2V~5.5V 的两路可调输出
  • 二次回馈输入维持电荷泵电压（ RT8205M ）
  • 恒定的 3.3V 和 5V 线性稳压器输出能力为 100mA
  • 2V 参考电压
  • 通过 TONSEL 的不同接法可以进行工作频率选择
  • 通过 RDS(ON) 进行的电流检测具有4700ppm/°C 的温度补偿
  • 可程序设计的电流限制和使能控制结合在单一引脚上
  • 有PWM、DEM和超声工作模式可供选择
  • 内置软起动和软放电功能
  • 效率高达 97%
  • 5mW 静态功率消耗
  • 过热关机保护
  • 符合 RoHS 规范，不含卤素
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Notebook and Sub-Notebook Computers 3-Cell and 4-Cell Li+ Battery-Powered Devices
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