MAX1686H

MAX1686/MAX1686H 19-1376; Rev 1; 12/98 3V to 5V Regulating Charge Pumps for SIM Cards General Description 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 45µA quiescent supply current, which reduces to 3µA 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 µMAX packages. GSM Cellular Phones PCS Phones Portable POS Terminals Personal Communicators Applications Features o 2.7V to 4.2V Input Range o 12mA min Charge-Pump...