LT8610AC/LT8610AC-1 42V, 3.5A Synchronous Step-Down Regulator with 2.5A Quiescent Current Fea T Descrip T n LT8610 Feature Set, Plus: The LT 8610AC/LT8610AC-1 is a compact, high efficiency, high speed synchronous monolithic step-down switching 3V Minimum Input Voltage regulator that consumes only 2.5A of quiescent current. 800mV Feedback Voltage Compared to the LT8610AB, the LT8610AC/LT8610AC-1 3.5A Maximum Output Current has a lower feedback voltage of 800mV and a lower mini- Fast 30ns Minimum Switch-On Time mum V of 3V. The LT8610AC/LT8610AC-1 has the same Improved Burst Mode Efficiency IN additional features of the LT8610AB as compared to the Improved EMI LT8610: higher maximum output current of 3.5A, faster n Wide Input Voltage Range: 3V to 42V minimum on time of 30ns, and higher light load efficiency. n Ultralow Quiescent Current Burst Mode Operation: 2.5A I Regulating 12V to 3.3V Q IN OUT The LT8610AC/LT8610AC-1 has a SYNC pin for syn- n High Efficiency Synchronous Operation: chronization to an external clock. A capacitor on the TR/ 95% Efficiency at 1A, 5V from 12V SS pin programs the output voltage ramp rate during OUT IN 93% Efficiency at 1A, 3.3V from 12V startup. The PG flag signals when V is within 8% of OUT IN OUT n Low Dropout Under All Conditions: 200mV at 1A the programmed output voltage as well as fault conditions. n Safely Tolerates Inductor Saturation in Overload The LT8610AC-1 has internal compensation optimized for n Adjustable and Synchronizable Frequency: high switching frequencies resulting in improved transient response compared to the LT8610AC. The LT8610AC-1 LT8610AC: 200kHz to 2.2MHz also has a feature which will soft-start the part when LT8610AC-1: 1.5MHz to 2.2MHz n exiting dropout or brownout conditions reducing output Accurate 1.015V Enable Pin Threshold n voltage overshoot. Output Soft-Start and Tracking n Small Thermally Enhanced 16-Lead MSOP Package FEEDBACK OUTPUT MIN ON IMPROVED VOLTAGE MIN V CURRENT TIME EMI IN LT8610AC 0.80V 3.0V 3.5A 30ns Yes a T LT8610AB* 0.97V 3.4V 3.5A 30ns Yes n Automotive and Industrial Supplies LT8610A* 0.97V 3.4V 3.5A 30ns Yes n GSM Power Supplies LT8610* 0.97V 3.4V 2.5A 50ns *See LT8610A/LT8610AB or LT8610 data sheet. 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 owners. Typical a T Efficiency at 5V OUT 100 5V 3.5A Step-Down Converter 90 V IN V BST IN 5.5V TO 42V 0.1F 4.7F EN/UV 80 4.7H V OUT LT8610AC PG SW 5V 47F 70 3.5A SYNC BIAS 2 10nF 60 1M TR/SS FB 1F 10pF 50 INTV CC V = 12V IN 40 RT GND V = 24V IN V = 36V IN 60.4k 191k 30 0.1 1 10 100 1000 LOAD CURRENT (mA) f = 700kHz 8610ac1 TA01b SW 8610ac1 TA01a 8610acfa 1 For more information www.linear.com/LT8610AC EFFICIENCY (%) ion pplica ions pplica ion uresLT8610AC/LT8610AC-1 a T e Maxi Mu M r a T p c F T (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 NC 7 10 SW SYNC Voltage ...........................................................6V GND 8 9 SW Operating Junction Temperature Range (Note 2) MSE PACKAGE 16-LEAD PLASTIC MSOP LT8610ACE/LT8610ACE-1 ...................... 40 to 125C = 40C/W, = 10C/W JA JC(PAD) LT8610ACI/LT8610ACI-1 ........................ 40 to 125C EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB LT8610ACH/LT8610ACH-1 .....................40 to 150C Storage Temperature Range ......................65 to 150C o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT8610ACEMSE PBF LT8610ACEMSE TRPBF 8610AC 16-Lead Plastic MSOP 40C to 125C LT8610ACIMSE PBF LT8610ACIMSE TRPBF 8610AC 16-Lead Plastic MSOP 40C to 125C LT8610ACHMSE PBF LT8610ACHMSE TRPBF 8610AC 16-Lead Plastic MSOP 40C to 150C LT8610ACEMSE-1 PBF LT8610ACEMSE-1 TRPBF 610AC1 16-Lead Plastic MSOP 40C to 125C LT8610ACIMSE-1 PBF LT8610ACIMSE-1 TRPBF 610AC1 16-Lead Plastic MSOP 40C to 125C LT8610ACHMSE-1 PBF LT8610ACHMSE-1 TRPBF 610AC1 16-Lead Plastic MSOP 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: