R & D built in LDO high integration 4 channel white LED driver

Analogictech Technology Co., Ltd. (AnalogicTech) recently announced the launch of a highly integrated 4 channel white light-emitting diode (WLED) driver AAT2847, used in portable system of lithium ion polymer battery. The charge pump based device is also built with two 200mA Low Dropout Linear Regulators (LDO), and all have their own independent boot pin for auxiliary system power supply.

The AAT2847 is used as a low noise, three mode DC / DC charge pump converter that provides up to 120mA of output current, and the 4 channels of the device can provide a bias current of up to 30mA for WLED. In order to ensure the uniformity of the display brightness, the typical value of WLED backlight bias current matching accuracy is 0.5%. The chip uses the advanced simplified serial (AS2Cwire) digital interface for each backlight LED channel on, off and current settings. The current level can be set up to 52 levels, including the 30mA, 20mA and 15mA in the current range of the current of the 16 different sets of 4, while the low level of the current settings can be as low as 50 A.

Each LED channel with built-in short circuit protection and auto off function. 1 low off current functions can disconnect the load from the input and reduce the quiescent current to less than 1 A. AAT2847 also integrates two LDO. Each LDO can be turned on by its own independent input control, support up to 200mA of output current. Fixed or adjustable output version is now available.

AAT2847 rated operating temperature range is -40 to +85 DEG C, using 20 pin, 3 x 4 x 0.75mm TQFN package, order quantity of 1000 pieces per unit price of $1.09.

Source: International Electronic Business