1A Corporation pushed by the total output current efficiency of five and 95% display

Linear Technology Corporation (Linear Technology) launched a fully integrated 850kHz, low noise, high efficiency 1x/1.5x/2x charge pump multi LED display driver LTC3208. It can drive up to 17 LED current source: a 1 - 4 LED, the main display of a 1 - 2 LED vice display, a 1 - 3 LED RGB display, a 1 - 4 LED camera display and a 1 - 4 LED auxiliary display. The device uses a compact 5mm x 5mm QFN package. Each display has independent dimming and digital control functions that are programmed via a two wire I2CTM serial interface.

LTC3208 range of input voltage of 2.9V to 4.5V for single lithium ion cell application and optimization. When the lithium-ion battery (nominal value of 3.6V) drive, the efficiency of 95%, while the quiescent current is only 250uA, thus maximizing the battery working hours. LTC3208 requires only 4 small capacitors and a resistor, can be composed of a small board area (34mm2, high 0.75mm) solution, can be used for all 5 independent LED display power supply.

The LTC3208 charge pump optimizes the efficiency according to the VIN and LED forward voltage. When the device is powered on, it enters the 1x mode, and automatically switches to the boost mode (1.5x) when any of the current LED current sources are in a bad position. Pressure difference and then switch to 2x mode. The maximum current of the main / auxiliary /RGB/ camera / auxiliary display is set with a single resistor. The LED current is controlled by an accurate internal current source, and all of the dimming and switching on / off control of the display are carried out through the two wire I2C serial interface. The main and secondary display has 256 brightness levels, RGB display has 4096 color combinations. Internal circuitry prevents inrush current and excessive input noise during start-up and mode switching.

32 lead QFN (5mm x 5mm) package LTC3208EUH available from stock. In 1000 pieces for the bulk purchase, each price starts at $2.55.