LT3952 60V LED Driver with 4A Switch Current FEATURES DESCRIPTION n 4000:1 True Color PWM Dimming The LT 3952 is a current mode step-up DC/DC converter n 4A, 60V Internal DMOS Switch with an internal, 60V, 80m DMOS power switch. The n Wide Input Voltage Range: 3V to 42V LT3952 is specifically designed to drive high power LEDs n 0V to 60V Output Current Regulation with Monitor in multiple configurations. It combines input and output n PMOS Switch Driver for PWM and Output Disconnect current regulation loops with output voltage regulation to n LED Short-Circuit Protection and SHORTLED Flag operate as a flexible current/voltage source. n Internal Spread Spectrum Frequency Modulation Programmable switching frequency with optional spread- n Constant-Current and Constant-Voltage Regulation spectrum modulation provides EMI reduction, while still n Input Current Limit and Monitor allowing optimization of the external components for n Adjustable Frequency: 200kHz to 3MHz, efficiency or component size. The LED current is program- Synchronizable to an External Clock mable with an external sense resistor, and can be adjusted n 10:1 Analog Dimming from zero to full scale with a voltage at the CTRL pin. The n Programmable Open-LED Protection with external PWM input provides LED ON/OFF control and OPENLED Flag 4000:1 dimming ratio, and an internal PWM generator n Programmable V Undervoltage and IN delivers the efficiency of PWM dimming to standalone Overvoltage Lockout or I/O limited applications. The LT3952 is available in the n Available in a 28-Lead TSSOP Package thermally enhanced 28-lead TSSOP package. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and APPLICATIONS True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including, 7199560, 7321203, 7746300. Patents pending n Display Backlighting n Automotive and Avionic Lighting n Accurate Current-Limited Voltage Regulators TYPICAL APPLICATION Short-Circuit Robust Boost LED Driver with Spread Spectrum Frequency Modulation 4A INPUT LIMIT 10H 15m V IN 7V TO 42V Efficiency vs Input Voltage 4.7F 2.2F 100V 100 V IVINP IVINN IN 2 EN/UVLO SW GND 1M OVLO 90 57V OPEN LED FB REGULATION 21.5k CTRL 80 V REF ISP LT3952 PWM PWM ISMON ISMON 750m INTV CC DIM 70 ISN 100k 100k SSFM OFF OPENLED OPENLED TG SSFM ON INTV INTV SHORTLED SHORTLED CC CC 60 V SYNC/SPRD C 0 10 20 30 40 50 IVINCOMP RT SS 3.6k V (V) 16 LED (50V) IN 3952 TA01b 333mA 90.9k 2.2F 8.2nF 1F 100nF 1MHz 3952 TA01a 3952fb 1 For more information www.linear.com/LT3952 EFFICIENCY (%)LT3952 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW V , IVINP, IVINN, SHORTLED, OPENLED, IN GND 1 28 GND EN/UVLO ..................................................................42V SW 2 27 ISP OVLO ........................................................................12V SW 3 26 ISN SW, ISP, ISN, TG .......................................................60V SW 4 25 TG IVINP-IVINN .....................................................1V to 3V IVINN 5 24 ISMON CTRL, FB, DIM, SYNC/SPRD, PWM ......... INTV + 0.3V CC IVINP 6 23 IVINCOMP VC, SS, ISMON, IVINCOMP .........................................3V V 7 22 OPENLED IN 29 RT, V .....................................................................2V REF GND EN/UVLO 8 21 SHORTLED INTV (Note 4) .......................................................3.6V CC OVLO 9 20 PWM Operating Junction Temperature Range (Notes 2, 3) INTV 10 19 SS CC LT3952E/LT3952I .............................. 40C to 125C SYNC/SPRD 11 18 V REF LT3952H ............................................ 40C to 150C GND 12 17 CTRL Storage Temperature Range .................. 65C to 150C VC 13 16 FB RT 14 15 DIM Lead Temperature (Soldering, 10 sec) ...................300C FE PACKAGE 28-LEAD PLASTIC TSSOP = 30C/W JA EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3952EFE PBF LT3952EFE TRPBF LT3952FE 28-Lead Plastic TSSOP 40C to 125C LT3952IFE PBF LT3952IFE TRPBF LT3952FE 28-Lead Plastic TSSOP 40C to 125C LT3952HFE PBF LT3952HFE TRPBF LT3952FE 28-Lead Plastic TSSOP 40C to 150C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: