Datasheet Texas Instruments LM3519MK-20/NOPB — Ficha de datos

LM3519
www.ti.com SNVS394B – AUGUST 2005 – REVISED MAY 2013 LM3519 High Frequency Boost White LED Driver with High-Speed PWM Brightness
Control
Check for Samples: LM3519 FEATURES 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. 1 2 Drives 2 to 4 LEDs at 20mA
Up to 30kHz PWM Dimming Control Capability
>80% Peak Efficiency
Up to 8MHz Switching Frequency
Small External Components: 1ВµH 3.3ВµH(typ.2.2ОјH) Inductor and 1ВµF Output
Capacitor
True Shutdown Isolation
Over-Voltage Protection
Wide Input Voltage Range: 2.7V to 5.5V
Small Footprint SOT-23 Package The LM3519 features a proprietary PFM regulation
architecture with switching frequencies between
2MHz to 8MHz, minimizing inductor size.
Over-voltage protection circuitry and high frequency …