MAX8718 Datasheet | Maxim Integrated

19-3495; Rev 0; 11/04 High-Voltage, Low-Power Linear Regulators for Notebook puters General Description The MAX8718/MAX8719 are micropower, 8-pin TDFN linear regulators that supply always-on, keep-alive power to CMOS RAM, real-time clocks (RTC), and microcontrollers in systems with high-voltage batteries. The circuits consist of a 100m A linear regulator and a power-good parator (PGOOD) with fixed-output delay. Key Features include wide input voltage range, low-dropout voltage, and low-quiescent supply current. Despite a miserly 25µA (max) no-load quiescent current, the MAX8718/MAX8719 have good line- and loadtransient response and excellent AC power-supply rejection. They provide a clean fixed 5V or 3.3V output (MAX8718), or an adjustable 1.24V to 28V output (MAX8719), even when subjected to fast supply-voltage changes that occur during the switchover from battery to AC-adapter input power. The space-saving TDFN package has excellent thermal characteristics and tolerates up to 1951m W of power dissipation. Internal foldback current limiting and thermal shutdown protect the regulator from overload and thermal faults. In addition to the main notebook-puter application, these devices are useful in other low-power, high-voltage applications (4V < VIN < 28V) such as smart batteries, current control loops, tele emergency power, and housekeeping power for off-line supplies. The MAX8718/MAX8719 are available in a thermally enhanced 3mm x 3mm, 8-lead TDFN package. - 4V to 28V Input Range - 18µA Quiescent Supply Current - <3µA Shutdown Supply Current - 100m A Output Current - 3.3V or 5V, Pin-Selectable Output (MAX8718) - Adjustable 1.24V to 28V Output (MAX8719) - ±2% Output Accuracy - Thermal-Overload Protection - Delayed Power-Good Output - Thermally Enhanced 8-Pin TDFN Package Features MAX8718/MAX8719 Ordering Information PART TEMP RANGE PIN-PACKAGE 8 TDFN 3mm x 3mm 8 TDFN 3mm x 3mm OUTPUT VOLTAGE 3.3V/5V Adjustable MAX8718ETA -40°C to +85°C MAX8719ETA...