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SNVS821A – JANUARY 2014 – REVISED MARCH 2014 LM3699 High-Efficiency White LED Driver
1 Features 3 Description The LM3699 is a three-string, high-efficiency, PWMcontrolled power source for display backlight or
keypad LEDs in smartphone handsets. The highvoltage inductive boost converter with integrated 1-A,
40-V MOSFET provides the power for three series
LED strings. The boost output automatically adjusts
to LED forward voltage to minimize headroom voltage
and effectively improve LED efficiency. 1 Drives Parallel High-Voltage LED Strings for
Display or Keypad Lighting
Boost Converter up to 90% Efficiency
Four User-Selectable Full-Scale Current Settings
(20.2 mA, 18.6 mA, 17.0 mA, 15.4 mA)
Quick-Dimming Enable Terminal (ILOW)
Simple PWM Duty Cycle Control
24-V Overvoltage Protection Threshold
Fixed 1-MHz Switching Frequency
Integrated 1-A/40-V MOSFET
Three Current Sink Terminals …
