LT8620 65V, 2A Synchronous Step-Down Regulator with 2.5A Quiescent Current FEATURES DESCRIPTION n Wide Input Voltage Range: 3.4V to 65V The LT 8620 is a compact, high efficiency, high speed n Ultralow Quiescent Current Burst Mode Operation: synchronous monolithic step-down switching regulator n 2.5A I Regulating 12V to 3.3V that accepts a wide input voltage range up to 65V, and Q IN OUT n Output Ripple < 10mV consumes only 2.5A of quiescent current. Top and bottom P-P n High Efficiency Synchronous Operation: power switches are included with all necessary circuitry n 94% Efficiency at 1A, 12V to 5V to minimize the need for external components. Low ripple IN OUT n 92% Efficiency at 1A, 12V to 3.3V Burst Mode operation enables high efficiency down to IN OUT n Fast 30ns Minimum Switch-On Time very low output currents while keeping the output ripple n Low Dropout Under All Conditions: 250mV at 1A below 10mV . A SYNC pin allows synchronization to an P-P n external clock. Internal compensation with peak current Safely Tolerates Inductor Saturation in Overload n mode topology allows the use of small inductors and Low EMI n results in fast transient response and good loop stability. Adjustable and Synchronizable: 200kHz to 2.2MHz n The EN/UV pin has an accurate 1V threshold and can be Accurate 1V Enable Pin Threshold n used to program V undervoltage lockout or to shut down Internal Compensation IN the LT8620 reducing the input supply current to 1A. A n Output Soft-Start and Tracking capacitor on the TR/SS pin programs the output voltage n Small Thermally Enhanced 16-Lead MSOP and ramp rate during start-up. The PG flag signals when V OUT 24-Lead 3mm 5mm QFN Packages is within 9% of the programmed output voltage as well as fault conditions. The LT8620 is available in small 16-Lead APPLICATIONS MSOP and 3mm 5mm QFN packages with exposed pads n Automotive and Industrial Supplies for low thermal resistance. n General Purpose Step-Down L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective n GSM Power Supplies owners. TYPICAL APPLICATION Efficiency at 5V OUT 5V 2A Step-Down Converter 100 95 V IN V BST IN 5.5V TO 65V 0.1F 90 4.7F EN/UV 4.7H V OUT 85 5V PG SW LT8620 2A 80 47F SYNC BIAS 10nF 75 1M TR/SS FB 70 1F 10pF 65 INTV CC 60 f = 700kHz SW RT GND V = 12V IN 55 V = 24V IN 60.4k 243k 50 0 0.25 0.5 0.75 1.0 1.25 1.5 1.75 2.0 f = 700kHz SW LOAD CURRENT (A) 8620 TA01a 8620 TA01b 8620fa 1 For more information www.linear.com/LT8620 EFFICIENCY (%)LT8620 ABSOLUTE MAXIMUM RATINGS (Note 1) V , EN/UV ................................................................65V SYNC Voltage . ............................................................6V IN PG .............................................................................42V Operating Junction Temperature Range (Note 2) BIAS ..........................................................................25V LT8620E ............................................ 40C to 125C BST Pin Above SW Pin................................................4V LT8620I ............................................. 40C to 125C FB, TR/SS, RT, INTV . ..............................................4V LT8620H ............................................ 40C to 150C CC LT8620MP ......................................... 55C to 150C Storage Temperature Range .................. 65C to 150C PIN CONFIGURATION TOP VIEW 24 23 22 21 SYNC 1 20 FB TOP VIEW TR/SS 2 PG 19 SYNC 1 16 FB RT 3 18 BIAS TR/SS 2 15 PG RT 3 14 BIAS EN/UV 4 17 INTV CC 25 EN/UV 4 17 13 INTV CC GND V 5 12 BST GND V 5 16 BST IN IN V 6 11 SW IN V 6 15 SW NC 7 10 SW IN GND 8 9 SW NC 7 SW 14 MSE PACKAGE GND 8 13 SW 16-LEAD PLASTIC MSOP 9 10 11 12 = 40C/W, = 10C/W JA JC(PAD) EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB UDD PACKAGE 24-LEAD (3mm 5mm) PLASTIC QFN = 46C/W, = 5C/W JA JC(PAD) EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT8620EMSE PBF LT8620EMSE TRPBF 8620 16-Lead Plastic MSOP 40C to 125C LT8620IMSE PBF LT8620IMSE TRPBF 8620 16-Lead Plastic MSOP 40C to 125C LT8620HMSE PBF LT8620HMSE TRPBF 8620 16-Lead Plastic MSOP 40C to 150C LT8620MPMSE PBF LT8620MPMSE TRPBF 8620 16-Lead Plastic MSOP 55C to 150C LT8620EUDD PBF LT8620EUDD TRPBF LGGV 24-Lead (3mm 5mm) Plastic QFN 40C to 125C LT8620IUDD PBF LT8620IUDD TRPBF LGGV 24-Lead (3mm 5mm) Plastic QFN 40C to 125C 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: