The LTC3208EUH is available from stock in a 32-lead QFN (5mm x 5mm) package. In 1,000-unit quantities, each starting at $ 2.55. Performance Summary: LTC3208 No inductor, efficiency up to 95% · Multi-mode and automatic mode switching 1x / 1.5x / 2x charge pump for efficiency optimization Up to 1A total output current · LED driver for main, sub, RGB, camera and sub display, driving 17 current sources · Two-wire I2C interface can be LED on / off, brightness levels and display configuration programming 0.5% (typical) LED current match Low noise, constant frequency work 2.9V to 4.5V input voltage range Smaller solutions <34mm 2 footprint, height <0.75mm · 5mm x 5mm QFN-32 package
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The LTC3208 charge pump automatically optimizes efficiency based on VIN and LED forward voltage. The device enters 1x mode at power-up and automatically switches to boost mode (1.5x) whenever any active LED current source is rapidly approaching a voltage drop. Switch to 2x mode after differential pressure appears. The maximum current of the main / sub / RGB / camera / sub display are set with a single resistor. 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 secondary monitors have 256 brightness levels and the RGB monitor has 4096 color combinations. The internal circuitry prevents inrush current and excessive input noise during startup and mode switching.
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 LED 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 form a small, low profile (<34mm2, 0.75mm) solution that can power all LEDs in five separate displays.