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Power chip has all handheld supplies covered
An
Advanced Analogic Technologies product story
Edited by the Electronicstalk editorial team
May 2, 2008
Highly integrated power IC allows designers of portable battery powered devices to optimise performance, reduce footprint and drive down cost.
By bringing together a battery charger, a low-noise 300mA buck convertor to power the baseband core, five LDOs for all critical digital, analogue, transmit and receive functions, and an I2C interface to control voltages dynamically, AnalogicTech's AAT2601 allows designers of portable battery powered devices, including those targeted at the Chinese market, to optimise performance, reduce footprint and drive down cost.
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 optimise system performance.
The 1.8V step-down convertor delivers an output of 300mA.
A 1.5MHz switching frequency helps minimise the size of supporting external components while keeping switching losses low.
Efficiency is greater than 95%.
Typical turn-on time is a fast 120us.
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 convertor and two LDOs are enabled is only 170uA.
The chip also features both overcurrent and overtemperature protection.
The AAT2601 is qualified across the -40 to +85C temperature range.
It is available in a 36-pin, 0.8mm-high TQFN package.
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