LTC3453 - Synchronous Buck-Boost High Power White LED Driver

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.

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

Typical Application

Applications

Cell Phones
Digital Cameras
PDAs
Portable Devices

Packaging

Order Information

Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC3453EUF#PBF	4x4 QFN-16	E	$2.64	$1.85
LTC3453EUF#TRPBF	4x4 QFN-16	E		$1.91

Demo Boards

Part Number	Description	Price
DC810A	LTC3453EUF Demo Board \| Buck-Boost Flash(500mA) / Torch(150mA) LED Driver, 2.7 ≤ VIN ≤ 5.5V, Vout up to 4V @ 500mA	$100.00