Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX4923-MAX4926
Edited by the Electronicstalk Editorial Team on 19 June 2007
Controllers cut power for overvoltage
protection
Overvoltage-protection controllers drive external P-channel FETs to provide protection to low-voltage systems against high-voltage faults up to 28V.
New from Maxim Integrated Products, the MAX4923-MAX4926 family of overvoltage-protection (OVP) controllers drive an external P-channel FET to provide protection to low-voltage systems against high-voltage faults up to 28V, while drawing a low 13uA (typical) supply current The use of an external P-channel FET enables these OVP controllers to achieve this low power consumption by eliminating the need for an integrated charge pump, which is the main source of current drain in competing solutions
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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Consequently, the MAX4923-MAX4926 are ideal for cellphones, MP3 players, PDAs, and other devices that implement battery charging through a wall adapter or USB port.
This family of OVP controllers provides +/-2.5% accurate overvoltage/undervoltage trip levels, and 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 of the devices.
Additionally, these controllers incorporate a fault flag signal that alerts the microcontroller of an overvoltage or undervoltage event.
Available in tiny 1.5 x 1.0mm 6-pin microDFN packages, the MAX4923-MAX4926 family of controllers is fully specified over the -40 to +85C extended temperature range.
Prices start at US $0.67 (1000-up).
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