The LM3642 is a 4-MHz fixed-frequency synchronous boost converter plus 1.5-A constant
current driver for a high-current white LED. The high-side current source allows for grounded
cathode LED operation providing Flash current up to 1.5 A. An adaptive regulation method ensures
the current source remains in regulation and maximizes efficiency.
The LM3642 is controlled via an I2C-compatible interface.
Features include a hardware flash enable (STROBE) allowing a logic input to trigger the flash pulse
as well as a TX input which forces the flash pulse into a low-current Torch Mode, allowing for
synchronization to RF power amplifier events or other high-current conditions.
The 4-MHz switching frequency, overvoltage protection and adjustable current limit
settings allow the use of tiny, low-profile inductors and (10-µF) ceramic capacitors. The device is
available in a small 9-bump DSBGA package and operates over the −40°C to 85°C temperature
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