LT3466 - Dual Full Function White LED Step-Up Converter with Built-In Schottky Diodes

Features

• Click Here For LT3466 Evaluation Kits
• Drives Up to 20 White LEDs (10 in Series per Converter) from a 3.6V Supply
• Two Independent Step-Up Converters Capable of Driving Asymmetric LED Strings
• Independent Dimming and Shutdown Control of the Two LED Strings
• Internal Schottky Diodes
• Internal Soft-Start Eliminates Inrush Current
• Open LED Protection (39.5V Max V_OUT)
• Fixed Frequency Operation Up to 2MHz
• 81% Efficiency Driving 16 White LEDs at 15mA (Eight per Driver) from a 3.6V Supply
• Wide Input Voltage Range: 2.7V to 24V
• Available in 10-Pin DFN and 16-Pin Thermally Enhanced TSSOP Packages

Typical Application

Description

LT3466 is a dual full function step-up DC/DC converter specifically designed to drive up to 20 White LEDs (10 in series per converter) with a constant current. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors and expensive factory calibration.

The two independent converters are capable of driving asymmetric LED strings. The dimming of the two LED strings can also be controlled independently. The LT3466 is ideal for providing backlight for main and sub-displays in cell phones and other handheld devices.

The LT3466 operating frequency can be set with an external resistor over a 200kHz to 2MHz range. A low 200mV feedback voltage minimizes power loss in the current setting resistor for better efficiency. Additional features include output voltage limiting when LEDs are disconnected and internal soft-start.

The LT3466 is available in the 10-pin (3mm × 3mm × 0.75mm) DFN and 16-pin thermally enhanced TSSOP packages.

Packaging

DFN-10

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
LT3466EDD	DFN	10	E	$3.14	$2.20	View
LT3466EDD#PBF	DFN	10	E	$3.14	$2.20	View
LT3466EDD#TR	DFN	8	E		$2.30	View
LT3466EDD#TRPBF	DFN	8	E		$2.30	View
LT3466EDD-1	DFN	10	E	$2.79	$1.95	View
LT3466EDD-1#PBF	DFN	10	E	$2.79	$1.95	View
LT3466EDD-1#TR	DFN	10	E		$2.05	View
LT3466EDD-1#TRPBF	DFN	10	E		$2.05	View
LT3466EFE	TSSOP	16	E	$3.14	$2.20	View
LT3466EFE#PBF	TSSOP	16	E	$3.14	$2.20	View
LT3466EFE#TR	TSSOP	16	E		$2.32	View
LT3466EFE#TRPBF	TSSOP	16	E		$2.32	View
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Request Samples

^* 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.

Evaluation Kits

Part Number	Description	Price
DC723A	LT3466EDD | Dual High Efficiency White LED (7/10) Driver, Vin = 3V - 8V or 3V - 20V (with Diode Option), Vout1 Test = 34V - 40V, Vout2 Test = 24V - 28V	$100.00
DC915A	LT3466EDD-1/ WLED Driver and LCD Bias	$100.00
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Applications

• Main/Sub Displays
• Digital Cameras, Sub-Notebook PCs
• PDAs, Handheld Computers
• Automotive

Simulate

LTSpice / SwitcherCAD III is a powerful FREE circuit simulator and schematic capture program, providing macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

• Step 1. If you do not already have a copy of LTSpice, click here to download and install LTSpice / SwitcherCAD III
  
  
• Step 2. Once LTSpice is installed, click here for a ready to run  demonstration circuit of the LT3466.
  
  
• Step 3. If LTspice / SwitcherCAD III does not automatically open after clicking the above link, you can instead run the simulation by right clicking on the link and selecting “Save Target As”. After saving the file to your computer, start LTSpice and open the demonstartion circuit by selecting "Open" from the "File" menu.