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OVP controllers boast low supply current draw

Posted: 21 Jun 2007 ?? ?Print Version ?Bookmark and Share

Keywords:OVP controllers? supply current? power management?

FETs" target=_blank>Maxim Integrated Products Inc. has rolled out new overvoltage protection (OVP) controllers that draw only 13mA (typical) supply current. The MAX4923-MAX4926 family drives an external p-channel FET (pFET) to provide protection to low-voltage systems against high-voltage faults up to 28V.

Maxim said the use of an external pFET enables these OVP controllers to achieve low-power consumption by eliminating the need for an integrated charge pump, which is the main source of current drain in competitive solutions. The MAX4923-MAX4926 family is suitable for cellphones, MP3 players, PDAs and other devices that implement battery charging through a wall adapter or USB port.

The MAX4923-MAX4926 OVP controller family provides 2.5 percent accurate overvoltage/undervoltage trip levels. It features a variety of overvoltage trip levels: 7.18V (MAX4923), 6.16V (MAX4924), 5.64V (MAX4925) and 4.46V (MAX4926). The undervoltage trip level is set to 2.44V (typical) for all devices. In addition, the devices incorporate a fault flag signal that alerts the MCU to an overvoltage or undervoltage event.

Available in a 1.5-by-1mm, 6-pin microDFN package, the MAX4923-MAX4926 family is fully specified over the -40C to 85C extended temperature range. Pricing starts at 67 cents (1,000-up, FOB USA).

- Gina Roos

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