LTC3454 - 1A Synchronous Buck-Boost High Current LED Driver

Features

• High Efficiency: >90% Typical in Torch Mode, >80% in Flash Mode
• Wide V_IN Range: 2.7V to 5.5V
• Up to 1A Continuous Output Current
• 3.5% LED Current Programming Accuracy
• Internal Soft-Start
• Open/Shorted LED Protection
• Constant Frequency 1MHz Operation
• Zero Shutdown Current
• Overtemperature Protection
• Small Thermally Enhanced 10-Lead (3mm × 3mm) DFN Package

Typical Application

Description

The LTC3454 is a synchronous buck-boost DC/DC converter optimized for driving a single high power LED at currents up to 1A from a single cell Li-Ion battery input. The regulator operates in either synchronous buck, synchronous boost, or buck-boost mode depending on input voltage and LED forward voltage. P_LED/P_IN efficiency greater than 90% can be achieved over the entire usable range of a Li-Ion battery (2.7V to 4.2V).

LED current is programmable to one of four levels, including shutdown, with dual external resistors and dual enable inputs. In shutdown no supply current is drawn. A high constant operating frequency of 1MHz allows the use of small external components.

The LTC3454 is offered in a low profile (0.75mm) thermally enhanced 10-lead (3mm × 3mm) DFN package.

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
LTC3454EDD	DFN	10	E	$2.79	$1.95	View
LTC3454EDD#PBF	DFN	10	E	$2.79	$1.95	View
LTC3454EDD#TR	DFN	10	E		$2.01	View
LTC3454EDD#TRPBF	DFN	10	E		$2.01	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.

Evaluation Kits

Part Number	Description	Price
DC875A	LTC3454EDD | Synch Buck-Boost High Power LED Driver in 3x3 DFN	$75.00
DC875B	LTC3454EDD Demo Board | Synchronous Buck-Boost LumiLED Driver	$75.00
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Applications

• Cell Phone Camera Flash
• Cell Phone Torch Lighting
• Digital Cameras
• PDAs
• Misc Li-Ion LED Drivers

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