-48V HOT-SWAP SWITCH TARGETS IP PHONES AND DATA TERMINAL EQUIPMENT REQUIRING DATA AND POWER ON THE SAME CABLE
SUNNYVALE, CA-February 8, 2001-Maxim introduces the MAX5911 and MAX5912, the industry's first fully integrated -48V hot-swap switch ICs. These devices are targeted for the emerging IP phones, wireless LAN access nodes, and data terminal equipment (DTE) that require data and power on the same cable. The devices allow safe insertion and removal of the DTE cable from a live port without causing glitches on the power supply.
Both devices include an internal 2-ohm power MOSFET and all support circuitry compliant with the new emerging IEEE 802.3af specifications. Dubbed the Simple Swapper™, the devices require no design and no external components for most applications. The MAX5911 and MAX5912 limit the maximum load current to 280mA and 415mA, respectively. Both devices include a "zero current " load disconnect feature that turns off the internal switch when load current drops below 8mA for over 350ms, thus protecting an open circuit port from potential high voltage. Other features include undervoltage lockout, ON/OFF pin, error flag output, and thermal shutdown. The switch is capable of operating at -16V to -65V input, while the ON/OFF pin is compatible with +3.3V and +5V logic signals. The error flag monitors four fault conditions: UVLO, power not good, "zero current " detection, and thermal shutdown. The error flag output goes low under any fault condition, alerting the system microprocessor.
Rated for extended temperature range (-40°C to +85°C) operation, the MAX5911 and MAX5912 are available in the surface-mount 8-pin SOIC and 16-pin SOIC packages, respectively. The 1000-piece price starts at $1.83 (FOB USA).
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