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 converter 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%. Turn-on time is a fast 120micro seconds 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 170microA. The chip also features both over-current and over-temperature protection.
The AAT2601 is qualified across the -40 C to +85 degrees C temperature range. It is available in a 36-pin, 0.8-mm high TQFN package.
