LM3519 Datasheet | National Semiconductor

LM3519 High Frequency Boost White LED Driver with High-Speed PWM Brightness Control September 2005 LM3519 High Frequency Boost White LED Driver with High-Speed PWM Brightness Control General Description The LM3519 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. The LM3519 Features a proprietary PFM regulation architecture with switching frequencies between 2MHz to 8MHz,...