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Overvoltage protectors
EDN Europe, 01 Sep 2008Maxim Integrated Products has introduced the MAX4970/MAX4971/MAX4972, a family of 2mm x 1.5mm overvoltage protectors (OVPs) that protect low-voltage systems against faults up to 28V. To minimise voltage dropout, these OVPs integrate 40mΩ internal on-resistance FET. Small size and the low on-resistance make these devices suitable for media players, cell phones, PDAs, digital cameras, and other portable applications. These devices can drive an optional, external FET to protect against reverse-polarity voltages. Bypassing with a 1µF capacitor to ground provides input protection up to ±15kV ESD (Human Body Model). The overvoltage thresholds are preset to 4.65V (MAX4972), 5.8V (MAX4970), or 6.35V (MAX4971). Each OVP is packaged in a small, 12-ball WLP that operates over the -40°C to +85°C extended temperature range.
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