The ADP3401 is a multifunction power management system IC optimized for GSM cell phones. The wide input voltage range of 3.0 V to 7.0 V makes the ADP3401 ideal for both single cell Li-Ion and three cell NiMH designs. The current consumption of the ADP3401 has been optimized for maximum battery life, featuring a ground current of only 150 A when the phone is in standby (digital LDO, and SIM card supply active). An undervoltage lockout (UVLO) prevents the startup when there is not enough energy in the battery. All four integrated LDOs are optimized to power one of the critical sub-blocks of the phone. Their novel anyCAPTM architecture requires only very small output capacitors for stability, and the LDOs are insensitive to the capacitors' equivalent series resistance (ESR). This makes them stable with any capacitor, including ceramic (MLCC) types for space-restricted applications.