LT3796/LT3796-1 100V Constant-Current and Constant-Voltage Controller with Dual Current Sense Fea T Descrip T n 3000:1 True Color PWM Dimming The LT 3796/LT3796-1 are DC/DC controllers designed to n Wide Input Voltage Range: 6V to 100V regulate a constant-current or constant-voltage and are n Current Monitoring Up to 100V ideal for driving LEDs. The fixed frequency and current n High Side PMOS Disconnect and PWM Switch Driver mode architecture result in stable operation over a wide n Constant-Current and Constant-Voltage Regulation range of supply and output voltages. Two ground referred n Dual Current Sense Amplifiers with Reporting voltage FB pins serve as the input for several LED protec- n C/10 Detection for Battery and SuperCap Charging tion features, and also allow the converter to operate as a n Linear Current Sense Threshold Programming constant-voltage source. The LT3796/LT3796-1 feature a n Short-Circuit Protection programmable threshold output current sense amplifier n Adjustable Frequency: 100kHz to 1MHz with rail-to-rail common mode range. A separate high n Frequency Synchronization (LT3796) side amplifier is gain configurable with two resistors and n Independent Top Gate Enable Pin (LT3796-1) can be used to regulate a second current or a voltage n Programmable Open LED Protection with VMODE Flag in combination with one of the FB pins. The PWM input n Programmable Undervoltage Lockout with Hysteresis provides LED dimming ratios of up to 3000:1. n Soft-Start with Programmable Fault Restart Timer The LT3796-1 is optimized for a second output current n Available in 28-Lead TSSOP Package regulation loop that can be enabled/disabled with a PMOS switch, either to drive a second LED string or to extend a T analog dimming range. n High Power LED, High Voltage LED, Dual String L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and True n Color PWM is a trademark of Linear Technology Corporation. All other trademarks are the Battery and SuperCap Chargers property of their respective owners. Protected by U.S. Patents, including 7199560, 7321203, n Accurate Current Limited Voltage Regulators 7746300. Typical a T Boost LED Driver with Input Current Monitor Efficiency vs V IN 50m 22H V IN 100 9V TO 60V 100V (TRANSIENT) 2.2F 2k 4 95 2.2F 1M 1M 499k 3 V V CSP CSN 90 IN S EN/UVLO GATE 13.7k 118k 85 97.6k V SENSE REF 15m CTRL 80 LT3796 GND CSOUT CSOUT 75 FB1 10nF 40.2k PWM PWM ISP 70 ISMON 0 10 20 30 40 50 60 0.1F 620m INTV CC SYNC V (V) IN ISN 37961 TA01b 100k 100k TG FAULT FAULT INTV INTV CC VMODE VMODE CC V RT FB2 SS C 4.7F 85V LED 31.6k 400mA 10k 0.1F 250kHz 10nF 37961 TA01a 3796fb 1 For more information www.linear.com/3796 EFFICIENCY (%) ion pplica ions pplica ion uresLT3796/LT3796-1 a Te Maxi Mu M r a T p in c F T (Note 1) V , V ....................................................................100V IN S TOP VIEW EN/UVLO .................................................................100V 1 28 CSOUT ISP ISP, ISN ...................................................................100V 2 27 CSP ISN TG, GATE...............................................................Note 2 3 26 CSN TG CSP, CSN ................................................................100V 4 25 V GND S V - CSP, V - CSN ....................................... 0.3V to 4V S S 5 24 EN/UVLO ISMON INTV (Note 3) .....................................8.6V, V + 0.3V CC IN 6 23 V FB2 IN PWM, VMODE, FAULT ...............................................12V 7 22 GND FB1 29 GND FB1, FB2, SYNC (LT3796), TGEN (LT3796-1) ..............8V 8 21 GND V C CTRL .........................................................................15V 9 20 INTV CTRL CC SENSE ......................................................................0.5V 10 19 GATE V REF 11 18 SENSE ISMON, CSOUT ...........................................................5V SS 12 17 GND RT V , V , SS ................................................................3V C REF 13 16 VMODE TGEN/SYNC* RT ...............................................................................2V 14 15 FAULT PWM Operating Junction Temperature Range (Note 4) LT3796E/LT3796I .................................. 40 to 125C FE PACKAGE 28-LEAD PLASTIC TSSOP LT3796H ................................................40 to 150C T = 150C, = 30C/W, = 10C/W JMAX JA JC EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB Storage Temperature Range ......................65 to 150C *SYNC FOR LT3796, TGEN FOR LT3796-1 o r Der i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3796EFE PBF LT3796EFE TRPBF LT3796FE 28-Lead Plastic TSSOP 40C to 125C LT3796IFE PBF LT3796IFE TRPBF LT3796FE 28-Lead Plastic TSSOP 40C to 125C LT3796HFE PBF LT3796HFE TRPBF LT3796FE 28-Lead Plastic TSSOP 40C to 150C LT3796EFE-1 PBF LT3796EFE-1 TRPBF LT3796FE-1 28-Lead Plastic TSSOP 40C to 125C LT3796IFE-1 PBF LT3796IFE-1 TRPBF LT3796FE-1 28-Lead Plastic TSSOP 40C to 125C LT3796HFE-1 PBF LT3796HFE-1 TRPBF LT3796FE-1 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. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: