LT8610A/LT8610AB Series 42V, 3.5A Synchronous Step-Down Regulator with 2.5A Quiescent Current FEATURES DESCRIPTION n LT8610 Feature Set, Plus: The LT 8610A/LT8610AB series are compact, high ef- 3.5A Maximum Output Current ficiency, high speed synchronous monolithic step-down Fast 30ns Minimum Switch-On Time switching regulators that consume only 2.5A of quies- Improved Burst Mode Efficiency (LT8610AB Only) cent current. Compared to the LT8610, they have higher Improved EMI maximum output currents of 3.5A and a faster minimum n Wide Input Voltage Range: 3.4V to 42V switch-on time of 30ns. The LT8610A has the same low n Ultralow Quiescent Current Burst Mode Operation: ripple burst mode performance of the LT8610, while the 2.5A I Regulating 12V to 3.3V LT8610AB has even higher light load efficiency. Q IN OUT n Fixed Output Voltages: 3.3V, 5V The other features of the LT8610 remain unchanged in the n Output Ripple < 10mV (LT8610A Only) P-P LT8610A/LT8610AB series. A SYNC pin allows synchroni- n High Efficiency Synchronous Operation: zation to an external clock. The EN/UV pin has an accurate 95% Efficiency at 1A, 5V from 12V OUT IN 1V threshold for V undervoltage lockout or shut down. IN 93% Efficiency at 1A, 3.3V from 12V OUT IN A capacitor on the TR/SS pin programs the output voltage n Low Dropout Under All Conditions: 200mV at 1A ramp rate during startup. The PG flag signals when V OUT n Safely Tolerates Inductor Saturation in Overload is within 9% of the programmed output voltage as well n Adjustable and Synchronizable Frequency: as fault conditions. 200kHz to 2.2MHz n OUTPUT MINIMUM 1mA LOAD Accurate 1V Enable Pin Threshold CURRENT ON TIME EFFICIENCY** n Output Soft-Start and Tracking LT8610* 2.5A 50ns 82% n Small Thermally Enhanced 16-Lead MSOP Package LT8610A 3.5A 30ns 82% LT8610AB 3.5A 30ns 91% APPLICATIONS *See LT8610 data sheet. **V = 12V, V = 3.3V, L = 4.7H IN OUT n Automotive and Industrial Supplies 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 LT8610AB Efficiency at 5V OUT 5V 3.5A Step-Down Converter 100 V IN V BST IN 5.5V TO 42V 90 0.1F 4.7F EN/UV 4.7H V OUT LT8610AB-5 80 5V PG SW 47F 3.5A SYNC BIAS 2 70 10nF 60 TR/SS V OUT 1F 50 INTV CC RT GND V = 12V IN 40 V = 24V IN 60.4k V = 36V IN 30 0.1 1 10 100 1000 f = 700kHz SW 8610ab TA01a LOAD CURRENT (mA) 8610ab TA01b 8610abfa 1 For more information www.linear.com/LT8610A EFFICIENCY (%)LT8610A/LT8610AB Series ABSOLUTE MAXIMUM RATINGS (Note 1) V , EN/UV, PG ..........................................................42V Operating Junction Temperature Range (Note 2) IN BIAS ..........................................................................30V LT8610AE/LT8610ABE ........................... 40 to 125C BST Pin Above SW Pin................................................4V LT8610AI/LT8610ABI ............................. 40 to 125C FB, TR/SS, RT, INTV .............................................4V LT8610AH/LT8610ABH ..........................40 to 150C CC V , SYNC Voltage .................................................6V Storage Temperature Range ......................65 to 150C OUT PIN CONFIGURATION LT8610A, LT8610AB LT8610A-3.3, LT8610A-5, LT8610AB-3.3, LT8610AB-5 TOP VIEW TOP VIEW 1 1 SYNC 16 FB SYNC 16 V OUT TR/SS 2 15 PG TR/SS 2 15 PG 3 3 RT 14 BIAS RT 14 BIAS EN/UV 4 17 13 INTV EN/UV 4 17 13 INTV CC CC 5 5 V GND 12 BST V GND 12 BST IN IN V 6 11 SW V 6 11 SW IN IN 7 7 NC 10 SW NC 10 SW GND 8 9 SW GND 8 9 SW MSE PACKAGE MSE PACKAGE 16-LEAD PLASTIC MSOP 16-LEAD PLASTIC MSOP = 40C/W, = 10C/W = 40C/W, = 10C/W JA JC(PAD) JA JC(PAD) EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT8610AEMSE PBF LT8610AEMSE TRPBF 8610A 16-Lead Plastic MSOP 40C to 125C LT8610AEMSE-3.3 PBF LT8610AEMSE-3.3 TRPBF 610A33 16-Lead Plastic MSOP 40C to 125C LT8610AEMSE-5 PBF LT8610AEMSE-5 TRPBF 8610A5 16-Lead Plastic MSOP 40C to 125C LT8610AIMSE PBF LT8610AIMSE TRPBF 8610A 16-Lead Plastic MSOP 40C to 125C LT8610AIMSE-3.3 PBF LT8610AIMSE-3.3 TRPBF 610A33 16-Lead Plastic MSOP 40C to 125C LT8610AIMSE-5 PBF LT8610AIMSE-5 TRPBF 8610A5 16-Lead Plastic MSOP 40C to 125C LT8610AHMSE PBF LT8610AHMSE TRPBF 8610A 16-Lead Plastic MSOP 40C to 150C LT8610AHMSE-3.3 PBF LT8610AHMSE-3.3 TRPBF 610A33 16-Lead Plastic MSOP 40C to 150C LT8610AHMSE-5 PBF LT8610AHMSE-5 TRPBF 8610A5 16-Lead Plastic MSOP 40C to 150C LT8610ABEMSE PBF LT8610ABEMSE TRPBF 8610AB 16-Lead Plastic MSOP 40C to 125C LT8610ABEMSE-3.3 PBF LT8610ABEMSE-3.3 TRPBF 10AB33 16-Lead Plastic MSOP 40C to 125C LT8610ABEMSE-5 PBF LT8610ABEMSE-5 TRPBF 610AB5 16-Lead Plastic MSOP 40C to 125C LT8610ABIMSE PBF LT8610ABIMSE TRPBF 8610AB 16-Lead Plastic MSOP 40C to 125C LT8610ABIMSE-3.3 PBF LT8610ABIMSE-3.3 TRPBF 10AB33 16-Lead Plastic MSOP 40C to 125C LT8610ABIMSE-5 PBF LT8610ABIMSE-5 TRPBF 610AB5 16-Lead Plastic MSOP 40C to 125C LT8610ABHMSE PBF LT8610ABHMSE TRPBF 8610AB 16-Lead Plastic MSOP 40C to 150C LT8610ABHMSE-3.3 PBF LT8610ABHMSE-3.3 TRPBF 10AB33 16-Lead Plastic MSOP 40C to 150C LT8610ABHMSE-5 PBF LT8610ABHMSE-5 TRPBF 610AB5 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. 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