Portable Applications 2.7V to 5.5V 28Pin TQFN EP T/R
The AAT2603 is a highly integrated power management solution for handheld mobile systems. It provides six regulated voltages from a single-cell Lithium-ion/polymer battery or a 5V supply. The six outputs are produced by six regulators; two switching step-down regulators and four low-dropout LDO regulators. Each voltage regulator has its own independent enable pin. The high efficiency step-down regulators are fully integrated and switch at a high 1.5 MHz fixed frequency. They automatically transition to variable frequency operation at light loads for improved efficiency. DC-DC1 Buck1 is designed for high output current and low dropout voltage 200mV at 1.2A. DC-DC2 Buck2 is a 600mA regulator with a two step dynamic output voltage capability. One option allows the output voltage of DC-DC2 Buck2 to be set to either 1.0V or 1.3V with the SELB2 logic pin. LDO regulators LDO1 and LDO2 can supply up to 400mA of load current with output voltages adjustable down to 1.5V. LDO regulators LDO3 and LDO4 can supply up to 200mA of current and provide good noise and power supply rejection. LDO3 and LDO4 have output voltages externally adjustable down to 1.2V. The AAT2603 is available in a Pb-free thermally enhanced 28-pin TQFN44 package and is rated for operation over the -40°C to +85°C temperature range.