The TPS61040DRVT is a 1 MHz step-up (boost) DC DC regulator from Texas Instruments, designed for driving LED backlight strings. It integrates the switching FET internally, delivers up to 28 V output from a 1.8 V to 6 V supply, and handles a 350 mA switch current limit. The PWM dimming input lets you adjust brightness without shifting the LED color point — important for display backlighting in industrial and portable equipment.
1 MHz switching frequency — inductor sizing and board area
That keeps the total BOM footprint compact.
28 V output and PWM dimming — string length and contrast ratio
The 28 V maximum output supports up to seven or eight white LEDs in series, depending on their forward voltage. That covers most small-to-medium LCD backlight panels.