The LM3519MK-20 is a high frequency boost LED Driver with high-speed PWM brightness control. It drives up to 4 white LEDs with constant current to provide LCD backlighting in handheld devices. The LED current is internally set to 20mA. The series connection allows the LED current to be identical for uniform brightness and minimizes the number of traces to the LEDs. Brightness control is achieved by applying a PWM signal on enable with frequencies up to 30kHz. It features a proprietary PFM regulation architecture with switching frequencies between 2 to 8MHz, minimizing inductor size.
True shutdown isolation
Over-voltage protection
>80% Peak efficiency
Small external components - 1 to 3.3μH (typical 2.2μH) inductor and 1μF output capacitor
(EN)
