OVP Controllers Drive an External pFET and Draw Only 13µA
The MAX4923-MAX4926 are overvoltage-protection (OVP) controllers that drive an external pFET.
These devices save power by drawing a low 13µA (typ) supply current.
They achieve a low supply current by using an external pFET, thus eliminating the need for an integrated charge pump, which is the main source of excessive current drain.
The MAX4923-MAX4926 family of controllers is ideal for cell phones, MP3 players, PDAs, and other devices that implement battery charging from a wall adapter or USB port.
SUNNYVALE, CA-June 18, 2007-Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX4923*-MAX4926 family of overvoltage-protection (OVP) controllers. These devices drive an external pFET to provide protection to low-voltage systems against high-voltage faults up to 28V, while drawing a low 13µA (typ) supply current. The use of an external pFET 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 competitive solutions. Consequently, the MAX4923-MAX4926 are ideal for cell phones, 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 (typ) 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 a tiny, 1.5mm x 1.0mm, 6-pin µDFN package, the MAX4923-MAX4926 family of controllers is fully specified over the -40°C to +85°C extended temperature range. Prices start at $0.67 (1000-up, FOB USA).
