The LM3544M-L/NOPB 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.
- 90m (typical) High-side MOSFET switch
- 7ms Fault flag delay filters hot-plug events
- Industry standard pin order
- Short-circuit protection with power-saving current foldback
- Thermal shutdown protection
- Undervoltage lockout
- 5μA Maximum standby supply current
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