LM3544M-L/NOPB

TEXAS INSTRUMENTS  LM3544M-L/NOPB  电源分配开关, USB, 四路高压侧, 低电平有效, 4路输出, 5.5V, 1.25A, SOIC-16

The is a quad port USB Power Distribution Switch that is an excellent choice for use in root, self-powered and bus-powered USB universal serial bus hubs. Independent port enables, flag signals to alert USB controllers of error conditions, controlled start-up in hot-plug events and short circuit protection all satisfy USB requirements. The LM3544 accepts input voltages between 2.7 and 5.5V. The enable logic inputs, available in active-high and active-low versions, can be powered off any voltage in the 2.7 to 5.5V range. The LM3544 limits the continuous current through a single port to 1.25A maximum when it is shorted to ground. The low on-state resistance of the LM3544 switches ensures the LM3544 will satisfy USB voltage drop requirements, even when current through a switch reaches 500mA. Thus, high-powered USB functions, low-powered USB functions and bus-powered USB hubs can all be powered off a root or self-powered USB hub containing the LM3544.

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90m typical High-side MOSFET switch

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7ms Fault flag delay filters hot-plug events

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Industry standard pin order

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Short-circuit protection with power-saving current foldback

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Thermal shutdown protection

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Undervoltage lockout

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5µA Maximum standby supply current