DESCRIPTION

· 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.
· 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.
· 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.

FEATURES

· VIN Range: 2.7V to 5.5V
· Two Step-Down Regulators:
- DC-DC1(Buck1): 1.2A, Low Dropout Voltage
- DC-DC2(Buck2): 0.6A, Low Dropout Voltage
· Externally Adjustable: V FBB1 = 0.6V, V FBB2 = 0.6V
· VOUT Range: 0.6V to V INB1, 0.6V to V INB2
· Fixed: V OUT = 3.3V, 1.0V[SELB2=’1’]/1.3V[SELB2=’0’]
· Factory Programmable to any Voltage Level from 0.6V to 4.0V
· Fixed 1.5MHz Switching Frequency
· Internally Compensated Current Mode Control
· High Efficiency over the Entire Load Range
· Four LDO Regulators:
- LDO1: 400mA LDO
- LDO2: 400mA LDO
- LDO3: 200mA, Low Noise LDO
- LDO4: 200mA, Low Noise LDO
· Fast Turn-On and Turn-Off time
· Short Circuit and Over-Current Protection
· Over-Temperature Protection
· Temperature Range: -40°C to +85°C
· TQFN44-28 Package

APPLICATIONS

· Handheld GPS
· Handheld Instruments
· PDAs and Handheld Computers
· Portable Media Players
· Smart Phones