Maxim offers small, high-input-voltage linear regulators that supply always-on, keep-alive power to CMOS RAM, realtime clocks (RTC), and microcontrollers in systems with high-voltage batteries. They draw a low 25 μA quiescent supply current.
Even when subjected to fast supply-voltage changes that occur during the switchover from battery to AC-adapter input power, the MAX8718 provides a fixed 5 V or 3,3 V output. The MAX8719 has an adjustable 1,24 V to 8 V output.
In addition to their principal application in notebook computers, these devices are useful in other low-power, high-voltage applications (4 V < V(IN) < 28 V), such as smart batteries, current-control loops, telecom emergency power, and housekeeping power for off-line supplies.
The MAX8718/MAX8719 are available in 8-pin TDFN package, screened for the -40 to +85°C range.
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