Research on the introduction of entry-level mobile phone 4 channel LED driver AAT3104/3195

Power management integrated circuit developers analogictech Technology Co. Ltd. (AnalogicTech?, the Nasdaq stock market code: AATI), yesterday announced the launch of AAT3104 and AAT3195 two new 4 channel, the charge pump LED driver for larger LCD screens in simplified function of the mobile phone and portable systems. The compact 2 x 2.1mm package, these devices in a space saving board provides designers with 16 step, 32 step or pulse width modulation (PWM) current control. Compared with the competitor's solution, AAT3104 and AAT3195 drives use 1 fold and 2 fold mode of high efficiency charge pump, reducing the number of external components up to 25%. In order to provide uniform brightness and perfect matching between adjacent LED, the AAT3104 provides a general purpose current inhaler for a common anode structure, while the AAT3195 supports a common source for common cathode structures.

"When engineers add new features to entry-level phones or other portable systems, they usually incorporate larger displays in their designs," said Phil, director of product line research at Dewsbury. "By providing constant current system output voltage required for forward bias LED, and common anode control, set up with 4 LED and the total structure of cathode current required to research, the two chips Nobel rich LED drive products new series, in a space saving package, improved design flexibility for portable the system designer provides high power efficiency, reduce the number of components and increases the current selection control. "

Interface selection AAT3104 is a current source LED driver can provide up to 30mA current of 4 LED each. Charge pump based devices can be automatically switched between 1 and 2 times to maximize efficiency and to optimize the accuracy and matching of LED current. The LED output current accuracy is + / - 10%. The LED output current matching is + / - 3%.

AAT3104 operates at a switching frequency of 1 MHz, through the patented patented single wire S2Cwire interface, which can provide a version of the 16 step (AAT3104-1) or (AAT3104-2) LED brightness control. AAT3105 version of PWM upcoming supply.

For common cathode LED, the AAT3195 provides a charge pump based current source LED driver for 4 channel applications. Similar to the AAT3104, the AAT3195 can provide up to 30mA current for up to 4 LED each. AAT3195 can also be automatically switched between 1 and 2 times to ensure maximum efficiency, current accuracy and matching. The LED output current accuracy is + / - 10%, LED output current matching is + / - 3%.

The operates at a switching frequency of 1 MHz, providing a different version of the interface through a different version of the AAT3195. AAT3195-1 through the S2Cwire interface, can provide 32 step adjustment of the 30mA current; AAT3195-2 using S2Cwire interface to support the 32 step 20mA current. AAT3195-3 with PWM interface.

These two drivers are equipped with automatic soft start, power saving, low current shutdown mode and built-in temperature protection function.

Price and supply AAT3104 and AAT3195 rated operating temperature range is -40o C to +85o C. All 2 x 2.1mm, 10- pin SC70JW package. AAT3104 in the order of 1000 pieces per piece price of $0.87, AAT3195 in the order of 1000 pieces per unit price of $0.87.

Source: electronic products in the world