LT3466 is a dual step-up converter capable of driving up to 20 white LEDs with a programmable constant current. The device is also capable of driving asymmetric LED strings with independent dimming and shutdown control for multipanel LCD backlight applications. The LT3466 uses a constant-current, step-up architecture to directly regulate LED current, providing consistent light intensity and color across all LEDs regardless of variations in their forward voltage drop. Important features including soft-start, open LED protection, adjustable switching frequency and DC dimming control are integrated into the part, making the LT3466 LED driver an ideal solution for space-constrained portable devices such as cellular phones, PDAs and digital cameras.
The document is a design note and datasheet for the Linear Technology LT3466, a dual channel LED driver. It details the device's ability to drive asymmetric LED strings from Li-Ion or adapter inputs, featuring integrated switches, Schottky diodes, and adjustable switching frequency.
Key features highlighted include soft-start, open LED protection, DC dimming control via CTRL pins (supporting both voltage and filtered PWM), and an efficiency above 80% at 20mA. The text provides circuit examples for driving 2-4 LEDs and 10-10 LEDs, along with efficiency graphs.
| Max white LEDs driven | 20 |
|---|---|
| Architecture type | constant-current, step-up |
| Input voltage range | 3.6V to 8V (Li-Ion) |
| Output current per string | up to 12mA |
| Operating frequency range | 200kHz to 2MHz |
| Internal power switches rating | 44V |
The device is capable of driving up to 20 white LEDs with a programmable constant current.
Yes, it features single pin shutdown and dimming control for each converter via CTRL1 and CTRL2 pins.
Efficiency is above 80% at 20mA for a 3.6V input.