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The RT9554A is designed for over-current detection. The current sense amplifier amplifies the voltage across resistor which is connected between CSP and CSN by 200. The amplified voltage is compared with the voltage of BAT_REF and check whether over-current happens or not. The RT9554A also provides a comparator with two input pins, AC_REAL and AC_REF for users. There is an output pin <span class="overline">FLAG</span> as an indicator which is a N-MOSFET in open-drain configuration. Users can connect one resistor between the <span class="overline">FLAG</span> pin and supply voltage. Either over-current condition occurs or the AC_REAL voltage is larger than the AC_REF voltage, the <span class="overline">FLAG</span> is pulled low. The RT9554A is a available in the WDFN-8L 2x2 package.
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- 共模输入电压最高可达 24V
- VCC 工作电流：200μA
- VCC 关机电流：5μA（在 S3/S4/S5 状态下）
- 可编程过流阈值
- 过流保护发生时FLAG 变为低电平
- 符合 RoHS 规范，不含卤素
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笔记本电脑
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