LT3593ES6#TRMPBF Analog Devices

LT3593 1MHz White LED Driver with Output Disconnect and One Pin Current Programming FEATURES DESCRIPTION n Drives Up to Ten White LEDs from a 3V Supply The LT 3593 is a step-up DC/DC converter designed to n One Pin Shutdown and Current Programming drive up to ten white LEDs in series from a Li-Ion cell. n LEDs Disconnected in Shutdown Series connection of the LEDs provides identical LED n 32:1 Linear Brightness Control Range currents and eliminates the need for ballast resistors. The n V Range: 2.7V to 5.5V device features a unique high side LED current sense that IN n 5% Output Current Accuracy at Full Scale enables the part to function as a one wire current source n Low Shutdown Current: 3A where the low side of the LED string can be returned to n 1MHz Switching Frequency ground anywhere. n Requires Only 1F Output Capacitor Additional features include output disconnect in shutdown, n Low Pro le 6-Lead DFN (2mm 2mm 0.75mm) open LED protection and 1-pin shutdown/LED current and 6-Lead SOT-23 Packages control. The CTRL pin is toggled to adjust the LED current via an internal counter and a 5-bit DAC. APPLICATIONS The LT3593 switches at 1MHz, allowing the use of tiny external components. Constant frequency switching re- n Cell Phones sults in low input noise and a small output capacitor. The n Digital Cameras LT3593 is available in the 6-lead DFN (2mm 2mm) as n PDAs, Handheld Computers well as the 6-lead SOT-23 packages. n MP3 Players L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. n GPS Receivers All other trademarks are the property of their respective owners. TYPICAL APPLICATION Li-Ion Driver for Ten White LEDs Conversion Ef ciency 90 10H V = 3.6V V IN IN 10 LEDs 3V TO 5V 1F 1F 80 V IN SW CAP 70 LT3593 60 SHUTDOWN AND CTRL LED CURRENT CONTROL GND 50 40 30 0 5 10 15 20 LED CURRENT (mA) 3593 TA01b 3593 TA01a 3593f 1 EFFI CIENCY (%)LT3593 ABSOLUTE MAXIMUM RATINGS (Note 1) Input Voltage ...............................................................6V Operating Junction Temperature Range CTRL Voltage ..............................................................6V (Note 2) .................................................... 40C to 85C SW Voltage ...............................................................45V Maximum Junction Temperature........................... 125C CAP Voltage ..............................................................45V Storage Temperature Range ................... 65C to 150C LED Voltage ..............................................................45V Lead Temperature (Soldering, 10 sec) TSOT Package ...................................................300C PIN CONFIGURATION TOP VIEW TOP VIEW 6 V 1 SW IN CTRL 1 6 LED 5 GND 2 7 CAP GND 2 5 CAP CTRL 3 4 LED V 3 4 SW IN S6 PACKAGE DC PACKAGE 6-LEAD PLASTIC TSOT-23 6-LEAD (2mm 2mm) PLASTIC DFN T = 125C, = 192C/W JMAX JA T = 125C, = 106C/W JMAX JA EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT3593EDC PBF LT3593EDC TRPBF LDBR 40C to 85C 6-Lead (2mm 2mm) Plastic DFN LT3593ES6 PBF LT3593ES6 TRPBF LTDBS 6-Lead Plastic TSOT-23 40C to 85C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based nish parts. For more information on lead free part marking, go to: