LT3465A

Features:

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)
Automatic Soft-Start (LT3465)
Open LED Protection
High Efficiency: 81% (LT3465) 79% (LT3465A) Typical
Requires Only 0.22mF Output Capacitor
Low Profile (1mm) SOT-23 Packaging


Application

Cellular Phones
PDAs, Handheld Computers
Digital Cameras
MP3 Players
 GPS Receivers


Specifications

Input Voltage (VIN) ................................................. 16V
SW Voltage ............................................................. 36V
FB Voltage ................................................................ 2V
CTRL Voltage .......................................................... 10V
Operating Temperature Range (Note 2) .. 40°C to 85°C
Maximum Junction Temperature ......................... 125°C
Storage Temperature Range ................  65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C

Description

The LT®3465/LT3465A 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 LT3465A switches at
2.4MHz. Constant frequency switching results in low input noise and a small output capacitor. Just 0.22mF is required for 3-, 4- or 5-LED applications.

The LT3465 and LT3465A are available in low profile (1mm) 6-lead SOT-23 (ThinSOTTM) packages.