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Part Number Description Vin(min)(V) Vin(max)(V) Status Input Voltage(Type) Topology Iout(Max)(A) LED Current Sense Voltage (mV) Dimming Method Switching Frequency (kHz) Cross Reference Package Pin/Package
AT8854 2.7 5 Sample DC-DC Buck-Boost 1 800 Resistor 1000 LTC3454 DFN10 DFN10


      The AT8854 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-lon 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 AT8854 is offered in a low profile (0.75mm) thermally enhanced 10-lead(3mm×3mm) DFN package.


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

Over temperature Protection

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


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