The LT3497 is a dual full function step-up DC/DC converter specifically designed to drive up to 12 white LEDs (6 white LEDs in series per converter) from a Li-Ion cell.
The LT3497 is a dual full‑function step‑up DC/DC converter designed to drive up to 12 white LEDs (six in series per converter) from a Li‑ion cell. It features independent boost converters, high‑side LED current sense for one‑wire connection, integrated Schottky diodes, and open‑LED protection, all in a 3 mm × 2 mm 10‑lead DFN package.
The device operates with a 2.3 MHz switching frequency, supports true‑color PWM dimming, and provides separate CTRL1 and CTRL2 pins for independent dimming and shutdown of each LED string. Electrical characteristics, pin functions, and typical performance data are detailed in the document.
| Minimum Operating Voltage | 2.5 V |
|---|---|
| Typical Switching Frequency | 2.3 MHz |
| Maximum Duty Cycle | 92 % |
| Number of LEDs Supported | Up to 12 white LEDs (6 per converter) |
It can drive up to 12 white LEDs, with six LEDs in series per converter.
Dimming is controlled via the independent CTRL1 and CTRL2 pins; a voltage below 50 mV disables a converter, and the voltage level sets the LED current.
The typical switching frequency is 2.3 MHz, allowing the use of small inductors and capacitors.
It is supplied in a 10‑lead plastic DFN package measuring 3 mm × 2 mm.