MAX8718

ABSOLUTE MAXIMUM RATINGS
IN to GND ..............................................................-0.3V to +30V
SHDN to GND ..............................................-0.3V to (VIN + 0.3V)
5/3 (MAX8718) to GND.............................................-0.3V to +6V
FB (MAX8719) to GND .............................................-0.3V to +6V
OUT (MAX8718) to GND ..........................................-0.3V to +6V
OUT (MAX8719) to GND ........................................-0.3V to +30V
Vcc to GND (MAX8718)...........................................-0.3V to +6V
Vcc to GND (MAX8719)........................................-0.3V to +2.7V
PGOOD to GND .....................................................-0.3V to +30V
I.C. to GND .............................................................-0.3V to +6V
OUT Short Circuit to GND.......................................................30s
Continuous Power Dissipation (TA = +70°C)
8-Pin TDFN (derate 24.4mW/°C above +70°C) ...........1951mW
Operating Temperature Range .........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range ..........................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C

Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

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 MAX8718 consist of a 100mA linear regulator and a power-good comparator (PGOOD) with fixed-output delay. Key features of MAX8718 include wide input voltage range, low-dropout volt ge, 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 of MAX8718 has excellent thermal  aracteristics and tolerates up to 1951mW of power dissipation. Internal foldback current limiting and thermal shutdown protect the regulator from overload and thermal faults.

In addition to the main notebook-computer application, these devices are useful in other low-power, high-voltage applications (4V < VIN < 28V) such as smart batteries, current control loops, telecom 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.