The LT ®3465/LT3465A are step-up DC/DC converters designed to drive up to six LEDs in series from a Li-Ion cell. These devices integrate the Schottky diode required externally on competing devices. Additional features include output voltage limiting when LEDs are disconnected, one-pin shutdown and dimming control. The LT3465 has internal soft-start.
The LT3465 and LT3465A are step‑up DC/DC converters designed to drive up to six white LEDs from a single Li‑Ion cell. They feature an integrated Schottky diode, automatic soft‑start, open‑LED protection, and high efficiency (81 % for LT3465, 79 % for LT3465A). The devices operate at 1.2 MHz (LT3465) or 2.4 MHz (LT3465A) and require only a 0.22 µF output capacitor.
Typical applications include cellular phones, PDAs, digital cameras, MP3 players, and GPS receivers. Recommended components are a 22 µH (or 10 µH for LT3465A) low‑loss inductor and X5R/X7R ceramic capacitors. The parts are supplied in a low‑profile 6‑lead SOT‑23 (ThinSOT) package.
| Input voltage range | 2.7 V to 16 V |
|---|---|
| Maximum output voltage | 30 V |
| Switching frequency (LT3465) | 1.2 MHz |
| Switching frequency (LT3465A) | 2.4 MHz |
| Efficiency (LT3465) | 81 % |
| Required output capacitor | 0.22 µF |
| Package type | 6‑lead SOT‑23 (ThinSOT) |
| Maximum duty cycle | 93 % |
| Switch current limit | 340 mA |
A 22 µH inductor is recommended for most LT3465 applications.
The LT3465 can drive up to six LEDs in series.
The LT3465A operates at 2.4 MHz.
The device works from 2.7 V up to 16 V input.