LT3465AES6#PBF Analog Devices

LT3465/LT3465A 1.2MHz/2.4MHz White LED Drivers with Built-in Schottky in ThinSOT DESCRIPTIO FEATURES Inherently Matched LED Current The LT 3465/LT3465A are step-up DC/DC converters Drives Up to Six LEDs from a 3.6V Supply designed to drive up to six LEDs in series from a Li-Ion cell. No External Schottky Diode Required Series connection of the LEDs provides identical LED 1.2MHz Switching Frequency (LT3465) currents and eliminates the need for ballast resistors. 2.4MHz Switching Frequency Above AM Broadcast These devices integrate the Schottky diode required exter- Band (LT3465A) nally on competing devices. Additional features include V Range: 2.7V to 16V output voltage limiting when LEDs are disconnected, one- IN V = 30V pin shutdown and dimming control. The LT3465 has OUT(MAX) Automatic Soft-Start (LT3465) internal soft-start. Open LED Protection The LT3465 switches at 1.2MHz, allowing the use of tiny High Efficiency: 81% (LT3465) 79% (LT3465A) external components. The faster LT3465A switches at Typical 2.4MHz. Constant frequency switching results in low input Requires Only 0.22F Output Capacitor noise and a small output capacitor. Just 0.22F is required Low Profile (1mm) SOT-23 for 3-, 4- or 5-LED applications. U The LT3465 and LT3465A are available in the low profile APPLICATIO S TM (1mm) 6-lead SOT-23 (ThinSOT ) package. Cellular Phones , LTC and LT are registered trademarks of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their PDAs, Handheld Computers respective owners. Digital Cameras MP3 Players GPS Receivers TYPICAL APPLICATIO Conversion Efficiency L1 82 22H V = 3.6V IN 80 4 LEDs 3V TO 5V 78 76 SW V OUT 74 V IN C1 C2 LT3465/ 72 1F 0.22F LT3465A SHUTDOWN 70 CTRL FB AND DIMMING 68 CONTROL GND 10 66 64 3465A F01a C1, C2: X5R OR X7R DIELECTRIC LT3465 62 L1: MURATA LQH32CN220 LT3465A 60 0 5 10 15 20 Figure 1. Li-Ion Powered Driver for Four White LEDs LED CURRENT (mA) 3465A F01b 3465afa 1 EFFICIENCY (%) U ULT3465/LT3465A UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW Input Voltage (V ) ................................................. 16V IN V 1 6 SW OUT SW Voltage ............................................................. 36V GND 2 5 V IN FB Voltage ................................................................ 2V FB 3 4 CTRL CTRL Voltage .......................................................... 10V S6 PACKAGE Operating Temperature Range (Note 2) .. 40C to 85C 6-LEAD PLASTIC TSOT-23 Maximum Junction Temperature ......................... 125C T = 125C, = 256C/W IN FREE AIR JMAX JA Storage Temperature Range ................ 65C to 150C = 120C ON BOARD OVER GROUND PLANE JA Lead Temperature (Soldering, 10 sec)................. 300C ORDER PART NUMBER S6 PART MARKING LT3465ES6 LTH2 LT3465AES6 LTAFT Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: