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Power management IC meets CDMA handset needs

Posted: 05 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:power management IC? CDMA handset? Li-ion battery charger?

Advanced Analogic Technologies Inc. has launched a power management IC designed for the specific requirements of mid-tier CDMA handsets. The AAT2601 integrates a single-cell Li-ion battery charger, a 300mA step-down converter, five LDO regulators, a reset function and an I2C interface to supply all the power requirements of next-generation CDMA handsets.

"The AAT2601 allows designers of CDMA handsets, including those targeted at the Chinese market, to optimize performance, reduce footprint and drive down cost," said Siamak Bastami, product line director for AnalogicTech.

Programmable output
The battery charger in the AAT2601 is a dynamic device capable of powering the system while charging the battery. This thermally regulated constant current/constant voltage linear charger combines a pass device, reverse blocking protection, high accuracy current and voltage regulation, charge status and charge termination functions. Charging current, charge termination current and recharge voltage are programmable via an external resistor or by a standard I2C interface. By using the I2C interface to program output voltages, designers can easily optimize system performance.

The 1.8-V step-down converter delivers an output of 300mA. A 1.5MHz switching frequency helps minimize the size of supporting external components while keeping switching losses low. Efficiency is greater than 95 percent. Turn-on time is a fast 120?s typical.

To power noise-sensitive circuits, the AAT2601's five LDOs offer 60dB power supply rejection ration (PSRR) and low noise operation. One of the LDOs outputs 300mA for digital circuit applications. The other four output 150mA each. The AAT2601 also integrates two load switches to support dynamic power path/sleep mode operation. Total no-load current when the step-down converter and two LDOs are enabled is only 170?A. The chip also features both over-current and over-temperature protection

Price and availability
The AAT2601 is qualified across the -40C to 85C temperature range. It is available in a 36-pin, 0.8mm high TQFN package. The device sells for $1.81 in quantities of 1,000.

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