LTC3453
Info: : PRODUCTION
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LTC3453

Synchronous Buck-Boost High Power White LED Driver

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $2.25
Features
  • High Efficiency: 90% Typical Over Entire Li-Ion Battery Range
  • Wide VIN Range: 2.7V to 5.5V
  • Up to 500mA Continuous Output Current
  • Internal Soft-Start
  • Open/Shorted LED Protection
  • LED Current Matching Typically <2%
  • Constant Frequency 1MHz Operation
  • Low Shutdown Current: 6µA
  • Overtemperature Protection
  • Small Thermally Enhanced 16-Lead (4mm x 4mm) QFN Package
Additional Details
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The LTC3453 is a synchronous buck-boost DC/DC converter optimized for driving up to 4 white LEDs at a combined current of up to 500mA from a single Li-Ion battery input. The regulator operates in either synchronous buck, synchronous boost, or buck-boost mode, depending on input voltage and LED maximum forward voltage. Optimum efficiency is achieved using a proprietary architecture that determines which LED requires the largest forward voltage drop at its programmed current, and regulates the common output rail for lowest dropout. Efficiency of 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 current setting resistors and dual enable pins. In shutdown, the supply current is only 6µA.

A high constant operating frequency of 1MHz allows the use of a small external inductor. The LTC3453 is offered in a low profile (0.75mm) thermally enhanced 16-lead (4mm x 4mm) QFN package.

Applications

  • Cell Phones
  • Digital Cameras
  • PDAs
  • Portable Devices
Part Models 2
1ku List Price Starting From $2.25

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3453EUF#PBF
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LTC3453EUF#TRPBF
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC810A

LTC3453EUF Demo Board | Buck-Boost Flash(500mA)/Torch(150mA) LED Driver, 2.7 ≤ VIN ≤ 5.5V, VLED

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DC810A

LTC3453EUF Demo Board | Buck-Boost Flash(500mA)/Torch(150mA) LED Driver, 2.7 ≤ VIN ≤ 5.5V, VLED

LTC3453EUF Demo Board | Buck-Boost Flash(500mA)/Torch(150mA) LED Driver, 2.7 ≤ VIN ≤ 5.5V, VLED

Product Detail

Demonstration circuit 810 is a high efficiency buck-boost flash LED driver featuring the LTC3453 and the LXCL-PWF1 Lumileds Luxeon Flash LED. The board is optimized for 500mA (300ms) LED flash current or 150mA constant LED torch current with a single Lithium-Ion battery input voltage range of 2.7V to 4.2V or three AAA batteries in series. The Lithium-Ion battery input voltage range, high LED flash current and separate torch mode current setting, internal synchronous power switches, minimal and low-profile external components, and simple design makes the LTC3453 a great solution for highly efficient, space-constrained cellular telephone camera flash solutions. DC810 comes with three AAA batteries in series to simulate the capabilities of a typical Lithium-Ion cellular telephone battery.

Tools & Simulations

Tools & Simulations 1

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.

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