LTC3205

PRODUCTION

Multidisplay LED Controller

Part Models: 2
1ku List Price: Starting From $2.59

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Overview

Step-Up/Step-Down Fractional Charge Pump for Up to 92% Efficiency
Independent Current and Dimming Control for 1-4 LED Main, 1-2 LED Sub and RGB LED Displays
LED Currents Programmable Using 3-Wire Serial Interface
Up to 250mA of Continuous LED Current
0.7% LED Current Matching
Low Noise Constant Frequency Operation
Minimal Component Count
Automatic Soft-Start Limits Inrush Current
Four Programmable Dimming States for Main and Sub Displays
Up to 4096 Color Combinations for RGB Display
Low Shutdown Current: I_CC < 1µA
Tiny 24-Lead (4mm x 4mm) QFN Package

The LTC3205 is a highly integrated multidisplay LED controller. The part contains a high efficiency, low noise fractional step-up/step-down charge pump to provide power for both main and sub white LED displays plus an RGB color LED display. The LTC3205 requires only four small ceramic capacitors plus two resistors to form a complete 3-display LED power supply and current controller.

Maximum currents for the main/sub and RGB displays are set independently with a single resistor. Current for each LED is controlled with an internal current source. Dimming and ON/OFF control for all displays are achieved via a 3-wire serial interface. Four dimming states exist for the main and sub displays and 16 dimming states are available via internal PWM for the red, green and blue LEDs resulting in up to 4096 color combinations.

The LTC3205 charge pump optimizes efficiency based on V_IN and LED forward voltage conditions. The part powers up in step-down mode and automatically switches to step-up mode once any enabled LED current source begins to enter dropout. Internal circuitry prevents inrush current and excess input noise during start-up and mode switching.

The LTC3205 is available in a low profile 24-lead (4mm x 4mm x 0.8mm) QFN package.

Applications

Cellular Phones
Wireless PDAs
Multidisplay Handheld Devices

Part Models: 2
1ku List Price: Starting From $2.59

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3205EUF#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3205EUF#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LTC3205EUF#PBF	PRODUCTION
LTC3205EUF#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

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Analog to Digital Converters (ADCs) 1
LTC2991	RECOMMENDED FOR NEW DESIGNS	Octal I²C Voltage, Current, and Temperature Monitor
Level Translators & Buffers 1
LTC4311	PRODUCTION	Low Voltage I²C/SMBus Accelerator

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3205

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.