LT8610 42V, 2.5A Synchronous Step-Down Regulator with 2.5A Quiescent Current FEATURES DESCRIPTION n Wide Input Voltage Range: 3.4V to 42V The LT 8610 is a compact, high efficiency, high speed n Ultralow Quiescent Current Burst Mode Operation: synchronous monolithic step-down switching regulator 2.5A I Regulating 12V to 3.3V that consumes only 2.5A of quiescent current. Top and Q IN OUT Output Ripple < 10mV bottom power switches are included with all necessary P-P n High Efficiency Synchronous Operation: circuitry to minimize the need for external components. 96% Efficiency at 1A, 5V from 12V Low ripple Burst Mode operation enables high efficiency OUT IN 94% Efficiency at 1A, 3.3V from 12V down to very low output currents while keeping the output OUT IN n Fast Minimum Switch-On Time: 50ns ripple below 10mV . A SYNC pin allows synchronization P-P n Low Dropout Under All Conditions: 200mV at 1A to an external clock. Internal compensation with peak cur- n Allows Use Of Small Inductors rent mode topology allows the use of small inductors and n Low EMI results in fast transient response and good loop stability. n Adjustable and Synchronizable: 200kHz to 2.2MHz The EN/UV pin has an accurate 1V threshold and can be n Current Mode Operation used to program V undervoltage lockout or to shut down IN n Accurate 1V Enable Pin Threshold the LT8610 reducing the input supply current to 1A. A n Internal Compensation capacitor on the TR/SS pin programs the output voltage n Output Soft-Start and Tracking ramp rate during start-up. The PG flag signals when V OUT n Small Thermally Enhanced 16-Lead MSOP Package is within 9% of the programmed output voltage as well n AEC-Q100 Qualified for Automotive Applications as fault conditions. The LT8610 is available in a small 16-lead MSOP package with exposed pad for low thermal resistance. APPLICATIONS All registered trademarks and trademarks are the property of their respective owners. n Automotive and Industrial Supplies n General Purpose Step-Down n GSM Power Supplies TYPICAL APPLICATION 12V to 5V Efficiency IN OUT 5V 2.5A Step-Down Converter 100 V IN V BST 95 IN 5.5V TO 42V 0.1F 4.7F EN/UV 90 4.7H V OUT 5V PG SW 85 LT8610 2.5A 47F SYNC BIAS 80 10nF 1M 75 TR/SS FB 1F 70 10pF 65 INTV CC RT PGND GND 60 f = 700kHz SW V = 12V IN 55 60.4k 243k V = 24V IN 50 0 0.5 1 1.5 2 2.5 f = 700kHz SW 8610 TA01a LOAD CURRENT (A) 8610 TA01b Rev. B 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LT8610 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW V , EN/UV, PG ..........................................................42V IN SYNC 1 16 FB BIAS ..........................................................................30V TR/SS 2 15 PG RT 3 14 BIAS BST Pin Above SW Pin................................................4V EN/UV 4 17 13 INTV CC V 5 12 BST GND IN FB, TR/SS, RT, INTV .............................................4V CC V 6 11 SW IN PGND 7 10 SW SYNC Voltage ...........................................................6V PGND 8 9 SW Operating Junction Temperature Range (Note 2) MSE PACKAGE 16-LEAD PLASTIC MSOP LT8610E ................................................. 40 to 125C = 40C/W, = 10C/W JA JC(PAD) LT8610I .................................................. 40 to 125C EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB LT8610H ................................................40 to 150C Storage Temperature Range ......................65 to 150C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT8610EMSE PBF LT8610EMSE TRPBF 8610 16-Lead Plastic MSOP 40C to 125C LT8610IMSE PBF LT8610IMSE TRPBF 8610 16-Lead Plastic MSOP 40C to 125C LT8610HMSE PBF LT8610HMSE TRPBF 8610 16-Lead Plastic MSOP 40C to 150C AUTOMOTIVE PRODUCTS** LT8610EMSE WPBF LT8610EMSE WTRPBF 8610 16-Lead Plastic MSOP 40C to 125C LT8610IMSE WPBF LT8610IMSE WTRPBF 8610 16-Lead Plastic MSOP 40C to 125C LT8610HMSE WPBF LT8610HMSE WTRPBF 8610 16-Lead Plastic MSOP 40C to 150C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. **Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are designated with a W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for thesemodels. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25C. A PARAMETER CONDITIONS MIN TYP MAX UNITS l Minimum Input Voltage 2.9 3.4 V V Quiescent Current V = 0V, V = 0V 1.0 3 A IN EN/UV SYNC l 1.0 8 A V = 2V, Not Switching, V = 0V 1.7 4 A EN/UV SYNC l 1.7 10 A V = 2V, Not Switching, V = 2V 0.24 0.5 mA EN/UV SYNC l V Current in Regulation V = 0.97V, V = 6V, Output Load = 100A 24 50 A IN OUT IN l V = 0.97V, V = 6V, Output Load = 1mA 210 350 A OUT IN Feedback Reference Voltage V = 6V, I = 0.5A 0.964 0.970 0.976 V IN LOAD V = 6V, I = 0.5A l 0.958 0.970 0.982 V IN LOAD l Feedback Voltage Line Regulation V = 4.0V to 42V, I = 0.5A 0.004 0.02 %/V IN LOAD Feedback Pin Input Current V = 1V 20 20 nA FB Rev. B 2 For more information www.analog.com