-48V SOT23 HOT-SWAP CONTROLLER TARGETS TELECOM POWER SYSTEMS
SUNNYVALE, CA—September 10, 2001—Maxim Integrated Products introduces the MAX5900/MAX5901, the industry’s first SOT23 -48V hot-swap controllers for telecom line cards. The MAX5900/MAX5901 hot-swap controllers allow telecom line cards to be safely inserted and removed from a live backplane without causing a glitch on the negative power supply rail.
Dubbed the Simple Swapper™, the MAX5900/MAX5901 provide the simplest hot-swap solution. The devices drive an external N-channel MOSFET and do not require an external sense resistor for overcurrent shutdown. The devices limit the inrush current to the load and provide a circuit breaker feature for overcurrent protection. Overcurrent shutdown is achieved by sensing the voltage drop across an N-channel MOSFET, caused by the FET’s "ON" resistance and output current. The device includes an undervoltage lockout feature that disconnects power to the load if the input voltage is too low. The default undervoltage lockout is set to -31.5V and can be set to any voltage between -9V to -100V. Other features include an ON/OFF pin for power-supply sequencing and load disconnect, a power-good indicator, and thermal shutdown for external MOSFET protection. The controller is capable of operating at a -9V to -100V input voltage range.
The MAX5900/MAX5901 are available in three functional versions. One version automatically restarts the controller after a circuit breaker shutdown, the second version latches the controller "OFF" after a circuit breaker shutdown, and the third version omits the circuit breaker function. The MAX5900 has an active-low power-good status output and the MAX5901 has an active-high power-good status output.
The MAX5900/MAX5901 are available in the extended temperature range (-40°C to +85°C) in surface-mount 6-pin SOT23 packages. Prices start at $1.04 (1000-up, FOB USA ).
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