LTC3454EDD#PBF High-Efficiency 1.5A Buck-Boost Converter with 2.7-5.5V Input 92% Peak Efficiency I²C Control Low Noise 2.5µA Shutdown and Tiny 3mm x 3mm DFN Package

FEATURES

n High Effi ciency: >90% Typical in Torch Mode, >80% in Flash Mode

n Wide VIN Range: 2.7V to 5.5V

n Up to 1A Continuous Output Current

n 3.5% LED Current Programming Accuracy

n Internal Soft-Start

n Open/Shorted LED Protection

n Constant Frequency 1MHz Operation

n Zero Shutdown Current

n Overtemperature Protection

n Small Thermally Enhanced 10-Lead (3mm × 3mm) DFN Package

APPLICATIONS

nCell Phone Camera Flash

nCell Phone Torch Lighting

n Digital Cameras

n PDAs

nMisc Li-Ion LED Drivers

DESCRIPTION

The LTC®3454 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 in put. The regulator operates in either synchronous buck, synchronous boost, or buck-boost mode depending on input voltage and LED forward voltage. PLED/PIN effi ciency 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, includ ing 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 profi le (0.75mm) thermally enhanced 10-lead (3mm × 3mm) DFN package.

INFORMATION

Drawing

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