LTC4222IUH#PBF

LTC4222 is a Hot Swap™ controller. It allows two power paths to be safely inserted and removed from a live backplane. Using external N-channel pass transistors, board supply voltages and inrush currents are ramped up at an adjustable rate. An I²C interface and onboard ADC allows for monitoring of current, voltage and fault status for each channel. This device features adjustable, analogue, foldback current limit circuits and a soft-start circuit that sets the dI/dt of the inrush currents. An I²C interface may configure the part to latch off or automatically restart after the device detects a fault on either channel. The controller has additional features to interrupt the host when a fault has occurred, notify when output power is good, detect insertion of a load card and power-up either automatically upon insertion or wait for an I²C command to turn on. It is widely used in applications such as live board insertion, electronic circuit breakers, computers, servers, platform management.

• 10bit ADC monitors currents and voltages, I²C/SMBus interface
• Wide operating voltage range from 2.9V to 29V
• High side drive for external N-channel MOSFETs
• No external gate capacitors required, input overvoltage/undervoltage protection
• Optional latch off or auto-retry after faults, alert host after faults
• Inrush current limit with foldback
• Offset error is ±3LSB max at (TA = 25°C, VDD = 12V)
• Integral nonlinearity is ±0.5LSB max at (TA = 25°C, VDD = 12V)
• Operating temperature range from -40°C to 85°C
• Package style is 32-lead plastic QFN

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