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TPS61099: 使用此芯片设计升压电路，带载能力弱

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Prodigy 30 points
Part Number: TPS61099

使用TPS61099DRVR设计升压电路，输入电压3.6V，输出电压4.6V，使用电子负载测试，在4.6V电压下的带载能力只有十几毫安，设置成100mA负载时，电压下降到4.5V左右，是什么原因？