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

Features

  • High Efficiency: >90% Typical in Torch Mode, >80% in Flash Mode
  • Wide VIN 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

LTC3454 Typical Application
LTC3454 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. PLED/PIN 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

For complete and up to date package information and drawings, please refer to our packaging page

DFN-10

LTC3454 Package Drawing

Order Info

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.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC875B LTC3454EDD Demo Board | Synchronous Buck-Boost LumiLED Driver. $75.00
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Click here to view our complete list of demo boards

Applications

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

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Design Tools

LTspiceIV

LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice IV

Models for the following parts are available in LTspice IV:
LTC3454

Technical Support