LT8393 60V , 100V Synchronous IN OUT 4-Switch Buck-Boost LED Driver Controller with Low EMI FEATURES DESCRIPTION n 4-Switch Single Inductor Architecture Allows V The LT 8393 is a synchronous 4-switch buck-boost LED IN Above, Below or Equal to V controller that regulates LED current from input volt- OUT n Up to 95% Efficiency age above, below, or equal to the output voltage. The n proprietary peak-buck peak-boost current mode control Proprietary Peak-Buck Peak-Boost Current Mode n scheme allows adjustable and synchronizable 350kHz to Wide V Range: 4V to 60V IN n 2MHz fixed frequency operation, or internal 25% triangle Wide V Range: 0V to 100V OUT n spread spectrum operation for low EMI. With 4V to 60V 4% LED Current Accuracy n input, 0V to 100V output, and seamless low noise transi- 2000:1 External and 128:1 Internal PWM Dimming n tions between operation regions, the LT8393 is ideal for 10V High Side PMOS PWM Switch Driver n LED driver and battery charger applications in automotive, No Top MOSFET Refresh Noise in Buck or Boost n industrial, and battery-powered systems. Adjustable and Synchronizable: 350kHz to 2MHz n Flicker-Free Spread Spectrum for Low EMI The LT8393 provides both internal (up to 128:1) and n Open and Short LED Protection with Fault Reporting external (up to 2000:1) LED current PWM dimming with n AEC-Q100 Qualified for Automotive Applications 10V of high side PMOS gate drive. The CTRL pin provides flexible 20:1 analog dimming with 4% LED current ac- curacy at 100mV full scale. Fault protection is provided to APPLICATIONS detect an open or short LED condition, during which the n Automotive Head Lamps/Running Lamps LT8393 retries, latches off, or keeps running. n High Voltage LED Lighting All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION 93% Efficient 24W (80V, 300mA) 350kHz Buck-Boost LED Driver 22H 10m V IN 6V TO 40V 4.7F 0.1F 0.1F 2x4.7F 22F SW1 LSP LSN SW2 50V 100V 50V 2 BST1 BST2 Efficiency vs V IN 100 INTV CC INTV CC BG1 BG2 GND 95 TG1 TG2 V 90 IN LT8393 1F V 499k OUT 1F 85 EN/UVLO 1M SSFM OFF 10.7k 143k SYNC/SPRD FB 80 SSFM ON INTV CC INTV CC ISP 4.7F 75 100k 330m FAULT FAULT ISN 70 0 5 10 15 20 25 30 35 40 45 ANALOG DIM CTRL PWMTG INPUT VOLTAGE (V) 100k 8393 TA01b V REF PWM PWM DIM V LED 0.47F 100k RP SS V RT 2V TO 80V C EXT INT 300mA 422k LEDs 1.5k 0.1F 350kHz 82k 15nF 170Hz 8393 TA01a Rev. B 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LT8393 ABSOLUTE MAXIMUM RATINGS (Note 1) INTV , (BST1-SW1), (BST2-SW2) .............................6V CC V , EN/UVLO ............................................................60V IN (BST1-LSP), (BST1-LSN) ............................................6V V , ISP, ISN .........................................................100V OUT FB, PWM, SYNC/SPRD, CTRL, FAULT .........................6V (ISP-ISN) .........................................................1V to 1V Operating Junction Temperature Range (Notes 2, 3) BST1 .........................................................................66V LT8393E ............................................ 40C to 125C BST2 .......................................................................106V LT8393J ............................................. 40C to 150C SW1, LSP, LSN .............................................. 6V to 60V LT8393H ............................................ 40C to 150C SW2 ........................................................... 6V to 100V Storage Temperature Range .................. 65C to 150C PIN CONFIGURATION TOP VIEW TOP VIEW BG1 1 28 BG2 BST1 2 27 BST2 SW1 3 26 SW2 28 27 26 25 24 23 TG1 4 25 TG2 TG1 1 22 TG2 LSP 5 24 V OUT LSP 2 21 V OUT LSN 6 23 PWMTG LSN 3 20 PWMTG V 7 22 SYNC/SPRD V 4 29 19 SYNC/SPRD IN IN 29 GND GND INTV 5 18 RT INTV 8 21 RT CC CC EN/UVLO 6 17 V EN/UVLO 9 20 V C C RP 7 16 FB RP 10 19 FB 8 PWM 15 SS PWM 11 18 SS 9 10 11 12 13 14 V 12 17 FAULT REF CTRL 13 16 GND ISP 14 15 ISN UFDM PACKAGE 28-LEAD (4mm 5mm) PLASTIC SIDE WETTABLE QFN FE PACKAGE = 43C/W, = 3.4C/W JA JC 28-LEAD PLASTIC TSSOP EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB = 30C/W, = 5C/W JA JC EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB Rev. B 2 For more information www.analog.com V SW1 REF CTRL BST1 ISP BG1 ISN BG2 GND BST2 FAULT SW2