Boost regulator with integrated switch for LED backlight
It integrates the power switch and uses a current-mode PWM control scheme operating at a fixed 1 MHz switching frequency, which allows the use of small, low-profile inductors and ceramic capacitors. The single-output regulator delivers a regulated output voltage up to 28 V from an input supply ranging from 1.8 V to 6 V.
1 MHz switching and 28 V output ceiling
The 1 MHz switching frequency places the fundamental ripple and its harmonics well above the audio band, which is a practical advantage in backlight applications where audible noise from ceramic capacitors is a concern. The 28 V output ceiling supports driving a string of six to eight white LEDs in series, depending on their forward voltage at the target current. PWM dimming on the enable pin lets the controller pulse the LED string at a duty cycle set by an external signal, while the output stays regulated. The part carries a standard industrial temperature grade, not AEC-Q100 qualification.
Active production, SOT-23-5 package
The small body size (approximately 2.9 mm x 1.6 mm) suits space-constrained portable designs.