LT8618/LT8618-3.3/LT8618C High Efficiency 65V/100mA Synchronous Bucks FEATURES DESCRIPTION n High Efficiency Synchronous Operation The LT 8618 family are compact, high speed synchro- n > 90% Efficiency at 30mA, 12V to 3.3V nous monolithic step-down switching regulators that IN OUT n deliver up to 100mA to the output with high efficiency at Pin Selectable Forced Continuous or Burst Mode a constant frequency, even up to 2.2MHz. They accept a Operation (LT8618C Only) n wide input voltage range up to 65V (transients only, 60V Ultralow Quiescent Current Burst Mode Operation n for continuous operation), and consume only 2.5A of < 2.5A I Regulating 48V to 3.3V Q IN OUT n quiescent current when operating in Burst Mode. Top and Output Ripple < 10mV P-P n bottom power switches are included with all necessary 3.4V to 60V Input Operation Range (65V Max) n circuitry to minimize the need for external components. Fast Minimum Switch-On Time: 35ns n Adjustable (All) And Synchronizable (LT8618C The LT8618C includes BST and INTV ceramic capaci- CC Only) Switching Frequency: 200kHz to 2.2MHz tors for a more compact solution while having SYNC/ n Fixed 3.3V Output Voltage Version (LT8618-3.3) MODE and HYST pins. The SYNC/MODE pin selects the n Accurate 1V Enable Pin Threshold (All) with regulators operation between forced continuous mode, Adjustable Hysteresis (LT8618C Only) for predictive interference in sampling systems, Burst n Internal Compensation Mode, for increased efficiency at light loads or spread n Output Soft-Start and Tracking spectrum for Low EMI. It also allows synchronization to n Small 12-Lead 2mm 2mm LQFN (LT8618C) and an external clock to further increase signal to noise ratio 10-Lead 3mm 2mm DFN Packages in high-resolution acquisition systems. n AEC-Q100 Qualified for Automotive Applications A PG flag signals when V is within 7.5% of the pro- OUT (LT8618/LT8618-3.3) grammed output voltage and when in fault conditions. Thermal shutdown provides additional protection. APPLICATIONS SYNC/ 150C INTERNAL FB n Industrial Sensors PACKAGE HYST GRADE CAPS RESISTORS n Industrial Internet of Things LT8618 DFN No Yes No External n 4mA to 20mA Current Loops LT8618-3.3 DFN No Yes No Internal n Flow Meters LT8618C LQFN Yes No Yes External n Automotive Housekeeping Supplies All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION Efficiency at V = 3.3V OUT 100 3.3V, Step-Down Converter 95 V =12V IN V IN V BST IN 90 4.2V TO 60V 1F 47nF V =24V IN LT8618-3.3 85 120H V OUT V =48V IN 80 OFF ON EN/UV SW 3.3V 1F 100mA 75 INTV BIAS CC 70 10nF 65 TR/SS PG RT OUT 60 110k 22F GND 55 f =400kHz 8618 TA1a SW 50 0 10 20 30 40 50 60 70 80 90 100 f = 400kHz SW OUTPUT CURRENT (mA) 8618 TA1b Rev. A 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LT8618/LT8618-3.3/LT8618C ABSOLUTE MAXIMUM RATINGS (Note 1) V , EN/UV Voltage (Note 4) ...................... 0.3V to 65V SYNC/MODE Voltage (LT8618C Only) .......... 0.3V to 6V IN PG Voltage ................................................. 0.3V to 42V Operating Junction Temperature Range (Note 2) BIAS Voltage .............................................. 0.3V to 25V LT8618E/LT8618E-3.3/LT8618CA .......... 40C to 125C HYST Voltage (LT8618C Only) ....................0.3V to 12V LT8618I/LT8618I-3.3 .............................. 40C to 125C FB (LT8618/LT8618C), TR/SS Voltages ........ 0.3V to 4V LT8618J/LT8618J-3.3 ............................ 40C to 150C OUT (LT8618-3.3) ........................................ 0.3V to 6V Storage Temperature Range .................. 65C to 150C PIN CONFIGURATION LT8618/LT8618-3.3 LT8618C TOP VIEW TOP VIEW 12 11 V 1 10 SW 1 10 BST V IN IN 2 9 SW EN/UV EN/UV 2 9 BIAS 11 13 3 8 BIAS PG GND GND HYST 3 8 RT 4 7 INTV TR/SS CC 5 6 RT FB/OUT* PG 4 7 SYNC/MODE 5 6 DDB PACKAGE 10-LEAD (3mm 2mm) PLASTIC DFN = 76C/W, = 13.5C/W JA JC LQFN PACKAGE EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB 12-LEAD (2mm 2mm 0.74mm) * FB FOR LT8618, OUT FOR LT8618-3.3 T = 125C, = 51C/W JMAX JA EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT8618EDDB TRMPBF LT8618EDDB TRPBF LHHF 10-Lead (3mm 2mm) Plastic DFN 40C to 125C LT8618IDDB TRMPBF LT8618IDDB TRPBF LHHF 10-Lead (3mm 2mm) Plastic DFN 40C to 125C LT8618JDDB TRMPBF LT8618JDDB TRPBF LHHF 10-Lead (3mm 2mm) Plastic DFN 40C to 150C LT8618EDDB-3.3 TRMPBF LT8618EDDB-3.3 TRPBF LHHW 10-Lead (3mm 2mm) Plastic DFN 40C to 125C LT8618IDDB-3.3 TRMPBF LT8618IDDB-3.3 TRPBF LHHW 10-Lead (3mm 2mm) Plastic DFN 40C to 125C LT8618JDDB-3.3 TRMPBF LT8618JDDB-3.3 TRPBF LHHW 10-Lead (3mm 2mm) Plastic DFN 40C to 150C LT8618CAV TRMPBF LT8618CAV TRPBF LHNG 12-Lead (2mm 2mm) LQFN (Laminate 40C to 125C Package with QFN footprint) Rev. A 2 For more information www.analog.com FB GND TR/SS DNC