UNINTERRUPTED +3.3V SMART REGULATOR FOR PCI COMPLIANT NIC REQUIRES ONLY 1µF OUTPUT CAPACITOR
SUNNYVALE, CA—May 26, 2000—Maxim Integrated Products introduces the MAX1810 smart regulator for Ethernet network interface cards (NICs), modem cards, and other devices that are system-compliant with peripheral component interconnect (PCI). The MAX1810 delivers an uninterrupted +3.3V at up to 500mA from a +5V main supply, a +5V standby supply, or a 3.3V auxiliary supply. When both main and standby supplies drop below 4.1V, an internal switch connects the PCI system’s +3.3V auxiliary input to the output. The internal switch is only 0.18 ohm and minimizes voltage drop from the auxiliary supply.
The main and standby inputs generate the +3.3V output via CMOS linear regulators with excellent line and load regulation. Only a 1µF ceramic capacitor is required at the output to guarantee stability. Under short-circuit conditions, the output current is limited to 900mA. Thermal-overload protection turns off the MAX1810 if the chip temperature exceeds +170°C. Special circuitry also prevents reverse current from flowing from the output to any inactive or low-voltage input.
The MAX1810 is available in a compact, high-power 8-pin SO package, capable of dissipating up to 0.9W. The parts are specified for the extended-industrial temperature range (-40°C to +85°C), with prices starting from $1.25 (1000-up, FOB USA).
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