The LT3518 is a current mode DC/DC converter with an internal 2.3A, 45V switch specifi cally designed to drive LEDs.
The LT3518 is a current‑mode DC/DC converter designed for LED lighting. It features an internal 2.3 A, 45 V switch, programmable switching frequency from 250 kHz to 2.5 MHz, and a 3000:1 true‑color PWM dimming ratio. The device can operate in boost, buck, or buck‑boost configurations, providing both constant‑current and constant‑voltage regulation.
Typical applications include display backlighting, automotive and avionic lighting, scanners, and general illumination. The part is offered in a 16‑lead QFN (4 mm × 4 mm) or a 16‑pin TSSOP package, and includes pins for shutdown, PWM dimming, frequency synchronization, and soft‑start control.
| Switch Current Limit | 2.3 A typical, 3.5 A max |
|---|---|
| Switch Voltage | 45 V |
| PWM Dimming Ratio | 3000:1 |
| Switching Frequency Range | 250 kHz to 2.5 MHz |
| Shutdown Current | <1 pA |
| Package Options | 16‑lead QFN (4 mm × 4 mm) and 16‑pin TSSOP |
The device can handle up to 2.3 A typical and 3.5 A maximum switch current.
The LT3518 provides a 3000:1 PWM dimming ratio.
It is available in a 16‑lead QFN (4 mm × 4 mm) and a 16‑pin TSSOP package.