LTC3208 - High Current Software Configurable Multidisplay LED Controller

Features

• 1x/1.5x/2x Charge Pump Provides Up to 95% Efficiency
• Up to 1A Total Output Current
• 17 Current Sources Available as MAIN, SUB, RGB, CAM and AUX LED Drivers
• LED ON/OFF, Brightness Level and Display Configuration Programmable Using 2-Wire I2C™ Interface
• Low Noise Constant Frequency Operation with Flying Capacitor Edge Rate Control
• Automatic Charge Pump Mode Switching
• Internal Soft-Start Limits Inrush Current During
• Startup and Mode Switching
• Open/Shorted LED Protection
• Short-Circuit/Thermal Protection
• 256 Brightness States for MAIN and SUB Displays
• 4096 Color Combinations for the RGB Display
• 5mm × 5mm 32-Lead QFN Plastic Package

Typical Application

Description

The LTC3208 is a highly integrated multidisplay LED controller. The part contains a 1A high effi ciency, low noise charge pump to provide power to the MAIN, SUB, RGB, CAM and AUX LED displays. The LTC3208 requires only 4 small ceramic capacitors and one current set resistor to form a complete LED power supply and current controller.

The maximum display currents are set by a single external resistor. Current for each LED is controlled by a precision internal current source. Dimming and On/Off for all displays is achieved via the I2C serial interface.  256 brightness levels are available for the MAIN and SUB displays. 16 levels are available for the RGB and CAM displays. Four AUX current sources can be independently assigned via the I2C port to the CAM, SUB, MAIN or AUX DAC controlled displays.

The LTC3208 charge pump optimizes effi ciency based on the voltage across the LED current sources. The part powers up in 1x mode and will automatically switch to boost mode whenever any enabled LED current source begins to enter dropout. The fi rst dropout switches the part into 1.5x mode and a subsequent dropout switches the LTC3208 into 2x mode. The part is available in a small 5mm × 5mm 32-lead QFN package.

Packaging

QFN-32

Order Info

• Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
• Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
• Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number	Package	Pins	Temp	Price (1-99)	Price (1k)*	RoHS Data
LTC3208EUH	QFN	32	E	$3.64	$2.55	View
LTC3208EUH#PBF	QFN	32	E	$3.64	$2.55	View
LTC3208EUH#TR	QFN	32	E		$2.65	View
LTC3208EUH#TRPBF	QFN	32	E		$2.65	View
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^* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Applications

• Video/Camera Phones with QVGA + Displays

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