The MAX1686 provides power for dual-voltage subscriber ID module (SIM) cards in portable applications such as GSM cellular phones. Designed to reside in the portable unit (cellular phone handset), the 1MHz charge pump converts a 2.7V to 4.2V input to regulated 5V output. The MAX1686H has a nominal output voltage of 5.0V, while the MAX1686 is set to 4.75V to reduce SIMcard current drain. The charge pump has only 45A quiescent supply current, which reduces to 3A when a 3V-capable SIM card is being powered and the charge pump is disabled. An internal input/output shorting switch provides power for 3V SIM cards.
The MAX1686/MAX1686H require only three external capacitors around their space-saving, thin (1mm) 8-pin MAX packages.
IN, OUT, SHDN, 3/5 to GND.....................................-0.3V to +6V
CXP to GND..............................................-0.3V to (VOUT + 0.3V)
CXN to GND ................................................-0.3V to (VIN + 0.3V)
PGND to GND ......................................................-0.3V to + 0.3V
OUT Short Circuit to GND ..........................................Continuous
IN-to-OUT Current..............................................................50mA
Continuous Power Dissipation (TA = +70°C )
8-Pin MAX (derate 4.1mW/°C above +70°C) ................330mW
Operating Temperature Range
MAX1686EUA/MAX1686HEUA..............................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range ............................-65°C to +165°C
Lead Temperature (soldering, 10sec) .............................+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.
Required Field 
