The LT3465/LT3465AES6#TRPBF are step-up DC/DC converters designed to drive up to six LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents and eliminates the need for ballast resistors. These devices integrate the Schottky diode required externally on competing devices. Additional features include output voltage limiting when LEDs are disconnected, onepin shutdown and dimming control. The LT3465 has internal soft-start.

The LT3465 switches at 1.2MHz, allowing the use of tiny external components. The faster LT3465AES6#TRPBF switches at 2.4MHz. Constant frequency switching results in low input noise and a small output capacitor. Just 0.22µF is required for 3-, 4- or 5-LED applications.

The LT3465 and LT3465AES6#TRPBF are available in low profile (1mm) 6-lead SOT-23 (ThinSOT™) packages.

Inherently Matched LED Current

Drives Up to Six LEDs from a 3.6V Supply

No External Schottky Diode Required

1.2MHz Switching Frequency (LT3465)

2.4MHz Switching Frequency Above AM Broadcast Band (LT3465A)

VIN Range: 2.7V to 16V

VOUT(MAX) = 30V

Automatic Soft-Start (LT3465)

Open LED Protection

High Efficiency: 81% (LT3465) 79% (LT3465A) Typical

Requires Only 0.22µF Output Capacitor

Low Profile (1mm) SOT-23 Packaging

Cellular Phones

PDAs, Handheld Computers

Digital Cameras

MP3 Players

GPS Receivers