BCT3144 High Efficiency Synchronous Boost Converter With Dual Independent 1.5 A Current Sources-Broadchip.com

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BCT3144
High Efficiency Synchronous Boost Converter With Dual Independent 1.5 A Current Sources

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GENERAL DESCRIPTION

The BCT3144 is a dual LED flash driver that provides a high level of adjustability within a small solution size. The BCT3144 utilizes a 2MHz or 4MHz fixed frequency synchronous boost converter to provide power to the dual 1.5A constant current LED sources. The total LED current the BCT3144 boost can deliver is 1.5A (ILED1+ ILED2). The dual 128 level current sources provide the flexibility to adjust the current ratios between LED1 and LED2 with each driver capable of delivering a maximum of 1.5A. An adaptive regulation met hod ensures the current sources remain in regulation and maximizes efficiency.

Features of the BCT3144 are controlled via an I²C comp atible interface. These features include: hardware flash and hardware torch pins (STROBE and TORCH/TEMP), a TX interrupt, and an NTC thermistor monitor. The device offers independently programmable currents in each output leg to drive the LEDs in a Flash or Movie Mode (Torch) condition.

The 2MHz or 4MHz switching frequency options, over voltage protection (OVP), and adjustable current limit allow for the use of tiny, low profile inductors and (10 µF) ceramic capacitors. The device operates over a 40°C to 85°C ambient temperature range.