Datasheet Texas Instruments LM3646YFQR — 数据表

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SNVS962A – DECEMBER 2013 – REVISED NOVEMBER 2014 LM3646 1.5-A Synchronous Boost Converter With Dual High-Side Current Sources
and I2C-Compatible Interface
1 Features 3 Description The LM3646 utilizes a 4-MHz fixed-frequency
synchronous boost converter to provide power to dual
1.5-A constant current LED sources. The high-side
current sources allow for grounded cathode LED
operation providing flash current up to 1.5 A total. An
adaptive headroom regulation scheme ensures the
LED currents remain in regulation and maximizes
efficiency. The combination of dual LED driving
capability, high LED current, small solution size and
high level of adjustability make the LM3646 perfect
for camera phone LED flash and torch applications. 1 High-Side Current Sources Allowing for Grounded
LED Cathode for Improved Thermal Management
> 85% Efficiency in Torch and Flash Modes
Small Solution Size < 20 mm2
Accurate and Programmable Flash LED Current …