Linear Technology Introduces Charge Pump Multi-Display LED Driver LTC3208

August 10, 2005 - BEIJING - Linear Technology introduces the LTC3208, a fully integrated 850kHz, low noise, high efficiency 1x / 1.5x / 2x charge pump multi-display LED Driver. It can drive up to 17 LED current sources: a main display with 1 - 4 LEDs, a sub-display with 1 - 2 LEDs, a RGB display with 1 - 3 LEDs and a 1 - 4 LEDs Camera display and a 1 - 4 LED auxiliary display. The device is available in a compact 5mm x 5mm QFN package. Each display has its own dimming and digital control programmed via a two-wire I2CTM serial interface. The LTC3208 2.9V to 4.5V input voltage is optimized for single-cell Li-ion honeycomb applications. When driven with a Li-Ion battery (nominally 3.6V), the efficiency is up to 95% while quiescent current is only 250uA, maximizing battery life. The LTC3208 requires only four small capacitors and a single resistor to provide a small footprint (the LTC3208 charge pump automatically optimizes efficiency based on VIN and LED forward voltage.) The device enters 1x mode at power-up Any working LED current source will automatically switch to boost mode (1.5x) as soon as the differential voltage is present. Switching to 2x mode after the differential has occurred. The maximum current of the primary / secondary / RGB / camera / Single Resistor Settings. The LED current is controlled with a precise internal current source and all display dimming and on / off controls are performed via the two-wire I2C serial interface. The main and sub displays have 256 levels of brightness and the RGB display Available in 4,096 colors, the internal circuitry prevents inrush current and excessive input noise during startup and mode switching LTC3208EUH in a 32-lead QFN (5mm x 5mm) package is available from stock in 1,000-piece quantities Pricing starts at $ 2.55 per unit. Performance Summary: LTC3208 • Inductorless, Up to 95% Efficiency • Multi-Mode and Automatic Mode Switching for Efficiency Optimization 1x / 1.5x / 2x charge pump • Up to 1A of total output current • LED drivers for main, sub, RGB, camera, and auxiliary displays drive up to 17 current sources • LED on / off with two-wire I2C interface, brightness Ratings and Display Configuration Programming · 0.5% (typ) LED Current Matching · Low Noise, Constant Frequency Operation · 2.9V to 4.5V Input Voltage Range · 2 Tiny Solutions Footprint, Height · 5mm x 5mm QFN- 32 package