LM3639A
www.ti.com SNVS964 – MARCH 2013 LM3639A Single Chip 40V Backlight + 1.5A Flash LED Driver
Check for Samples: LM3639A FEATURES DESCRIPTION The LM3639A is a single-chip white LED Camera
Flash Driver + LCD Display Backlight Driver. The lowvoltage, high-current flash LED driver is a
synchronous boost which provides the power for a
single flash LED at up to 1.5A or dual LEDs at up to
750 mA each. The high-voltage backlight driver is a
dual-output asynchronous boost which powers dual
LED strings at up to 40V and 30 mA per string. An
adaptive regulation method in both boost converters
regulates the headroom voltage across the respective
source/sink to ensure the LED current remains in
regulation
while
maximizing
efficiency.
The
LM3639A's flash driver is a 2MHz or 4MHz fixedfrequency synchronous boost converter plus 1.5A
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
1.5A. An adaptive regulation method ensures the
current source remains in regulation and maximizes …
