LED Multi-Display Driver features 2-wire I2C interface.
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Press Release Summary:
Model LTC3206 is an 800 kHz, step-up/step-down, fractional charge pump voltage converter that can drive 1-6 LED main display, 1-4 LED sub-display, plus RGB display, all in 4 x 4 mm QFN package. Each display has digital control with independent dimming and programming via 2-wire I2C serial interface. Input voltage range of 2.8-4.5V and efficiencies up to 92% without inductors optimizes driver for single cell Li-Ion cellular applications.
Original Press Release:
Cell Phone LED Multi-Display Driver Features 2-Wire I2C Interface & 92% Efficiency
MILPITAS, CA - July 21, 2004 - Linear Technology Corporation announces the LTC3206, an 800kHz, low noise, high efficiency step-up/step-down fractional charge pump voltage converter. It can drive a 1-6 LED main display, 1-4 LED sub-display plus an RGB display, all from a 4 x 4mm QFN package. Each display has digital control with independent dimming and programming via a two-wire I2C serial interface. The device's input voltage range of 2.8V to 4.5V optimizes it for single cell Li-Ion cellular applications. Driven from a single cell Li-Ion battery (3.6V), efficiencies reach 92% with quiescent current of only 180uA, maximizing battery run-time. The LTC3206 requires only four small capacitors and two resistors to create a tiny (<25mm2, 0.75mm high) solution footprint, capable of powering all LEDs used in three separate displays.
The LTC3206 charge pump optimizes efficiency based on VIN and LED forward voltage conditions. The device powers up in step-down mode and only switches to step-up mode when any enabled LED current source approaches dropout. Maximum currents for the main/sub/RGB displays are set with a single resistor. LED currents are controlled with internal current sources while dimming and ON/OFF control for all displays is achieved via a 2-wire I2C serial interface. Sixteen dimming states (logarithmic scale) are available for the main and sub displays, for a 128:1 dimming range. 16 dimming states are available through internal PWM for each of the Red, Green and Blue LEDs, resulting in 4096 color combinations. Internal circuitry prevents inrush current and excessive input noise during start-up and mode switching.
The LTC3206EUF is available from stock in a 24-Lead QFN (4mm x 4mm) package. Pricing starts at $2.20 each for 1,000-piece quantities.
Summary of Features: LTC3206
Up to 92% Efficiency Without Inductors
Step-Up/Step-Down Fractional Charge Pump for Optimal Efficiency
Independent Current and Dimming Control for 1-6 Main, 1-4 Sub and RGB Displays
LED Currents Programmed Using a 2-Wire I2C Serial Interface
<0.7% LED Current Matching Error
Low Noise, Constant Frequency Operation
2.7V to 4.5V Input Voltage Range
Tiny Solution Footprint, <25mm2, <0.75mm Profile
4 x 4mm QFN-24 Package
Company Background
Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems.
