Date: 14/04/2009

Power management IC with LDO for smart phones to power LEDs and cameras

AnalogicTech's new power management IC also called light management unit AAT2862 features 8 configurable LED channels for backlighting and 4 Low Dropout Regulators for powering camera modules in mobile phones. This IC, which can operate from a single-cell Lithium-ion/polymer battery, is developed for smart phones. Automatic fade-in/fade-out of backlight control is hardware pre-programmed into this device.

"Given the complexity and diversity of feature sets found in today's cell phone product lines, designers can gain tremendous advantage in terms of design time and cost by using the same power management solution in multiple products," said Phil Dewsbury, product line director for AnalogicTech. "By delivering industry-standard I2C programmability across nine different LED combinations and I2C control across 16 different voltage settings for each LDO, the AAT2862 provides the level of versatility designers require to build complex products in short design cycles."

Operating from a 2.7V to 5.5V input voltage, the AAT2862 can drive up to eight backlight LEDs at up to 30 mA each. To ensure constant current over the entire battery range, the LEDs are driven from a tri-mode charge pump, which automatically switches between 1x, 1.5x and 2x modes to maximize operating efficiency.

The eight LED outputs are programmable from 500µA up to 30mA. Two LED outputs can be programmed up to 60 mA each. Current can be set to any of 32 separate levels via an industry-standard I2C interface. To ensure uniform display brightness, current matching is better than 3%. To balance power dissipation, high current matching exceeds 5%.

The AAT2862 also features four high performance low noise LDOs. The output of each LDO is programmable via the I2C serial interface to any of 16 voltages between 1.2V and 3.3V. Each regulator can supply up to 200mA load current. To support battery-operated applications, ground-pin current is limited to 80µA.

AAT2862 also features automatic soft start and built-in thermal protection.

Operating Temp Range: -40º C to +85º C
Package: 24-pin TQFN34 package
Availability: Now
Price: Each $1.81 in 1K pieces