LTC3453

PRODUCTION

Synchronous Buck-Boost High Power White LED Driver

Data Sheet Product Selection Table
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Overview

  • 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

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
LTC3453
Synchronous Buck-Boost High Power White LED Driver
High Efficiency Torch/Flash LED Driver Torch Mode Efficiency vs VIN Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 2

Data Sheet

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

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Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3453
LTspice

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.

Evaluation Kits

eval board
schematic 1
DC810A

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

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Product Details

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.
DC810A
LTC3453EUF Demo Board | Buck-Boost Flash(500mA)/Torch(150mA) LED Driver, 2.7 ≤ VIN ≤ 5.5V, VLED
DC810A - Schematic

Latest Discussions

2 Years Ago
looking for LED driver like LTC3201 but with 400mA output
2 Years Ago
LTC3453 fails and short circuit
2 Years Ago
LTC3453 short-circuit
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