USB port switch with adjustable current limit
It delivers up to 700 mA continuous output from a load voltage range of 2.7 V to 5.5 V, covering single-cell Li-ion and standard USB bus voltages. The switch requires no separate Vcc supply — the load voltage powers the internal gate drive, simplifying the BOM for USB ports on portable equipment, docking stations, and industrial peripherals. Typical on-resistance is 60 mOhm, keeping conduction loss low enough that most designs can run without a heatsink at the rated current. The output is a P-channel MOSFET configured as a high-side switch with a 1:1 input-to-output ratio. The On/Off interface accepts a non-inverting logic signal to enable or disable the output. Fault protection includes adjustable current limiting (set via an external resistor), over-temperature shutdown, and undervoltage lockout.
The MAX1607ESA+ is supplied in an 8-pin SOIC package — a standard footprint for board-level power switching. It ships in Tube form, which suits bench builds and low-volume production; for reel quantities the ordering suffix changes, so confirm the exact code for tape-and-reel if that is your line requirement.