LM3519
FEATURES
- 2 Drives 2 to 4 LEDs at 20m A
- Up to 30k Hz PWM Dimming Control Capability
- >80% Peak Efficiency
- Up to 8MHz Switching Frequency
- Small External ponents: 1µH
- 3.3µH(typ.2.2μH) Inductor and 1µF Output Capacitor
- True Shutdown Isolation
- Over-Voltage Protection
- Wide Input Voltage Range: 2.7V to 5.5V
- Small Footprint SOT-23 Package
APPLICATIONS
- LCD, White LED Backlighting on Mobile Phones
- Digital Still Cameras and PDAs
- General Purpose LED Lighting in Handheld
Devices
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 20m A. 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 30k Hz.
The LM3519 features a proprietary PFM regulation architecture with switching frequencies between 2MHz to 8MHz,...
