PMIC for handheld systems
19 August 2008
An integrated power management IC is for handheld devices using a single lithium-ion battery.
Primarily aimed at mobile GPS devices, portable media players, and other lithium-ion powered devices, Analogic’s AAT2603 is an integrated power management IC operating from a 2.7V to 5.5V input range.
The six-channel PMIC integrates two step-down converters and four LDOs (each with its own independent enable pin) into a 28pin, 4mm x 4mm TQFN package. The first step-down converter supports functions requiring high output current and low dropout voltage. The second step-down converter supplies 600mA and adds two-step dynamic output voltage capability to match the needs of common system processors. The converter shifts between the two output voltages by toggling the SELB2 pin. Four LDOs supply power to a variety of system functions. Two LDOs deliver 200mA and are designed to power noise sensitive circuits. The second pair of LDOs offers 400mA output, and each of the four LDOs consumes 50µA of quiescent current. The new IC also features protection circuits including those for short-circuits, over-current and over-temperature protection. It is designed to operate across the -40º C to +85º C range.
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