LT8610AX 42V, 3.5A Synchronous Step-Down Regulator with Operation to 175C FEATURES DESCRIPTION n 100% Tested at 175C The LT 8610AX is a compact, high efficiency, high speed n 2% Reference Accuracy Over 40C to 175C Range synchronous monolithic step-down switching regulator n Wide Input Voltage Range: 3.7V to 42V rated to 175C junction temperature. The LT8610AX is n Ultralow Quiescent Current Burst Mode Operation 100% tested a 175C. Top and bottom power switches n High Efficiency Synchronous Operation are included with all necessary circuitry to minimize the n 91% Eff. at 0.5A, at 175C, 3.3V from 12V need for external components. Low ripple Burst Mode OUT IN n 92% Eff. at 0.5A, at 175C, 5V from 12V operation enables high efficiency across a wide range of OUT IN n Adjustable and Synchronizable Frequency: 200kHz output currents while keeping the output ripple low. A SYNC to 2.2MHz pin allows synchronization to an external clock. Internal n No Thermal Shutdown compensation with peak current mode topology allows n Internal Compensation the use of small inductors and results in fast transient n Output Soft-Start and Tracking response and good loop stability. The EN/UV pin has an n Power Good Flag accurate 1V threshold and can be used to program V IN n Small Thermally-Enhanced 16-Lead MSOP Package undervoltage lockout or to shut down the LT8610AX. A capacitor on the TR/SS pin programs the output voltage ramp rate during startup while the PG flag signals when APPLICATIONS V is within 9% of the programmed output voltage OUT as well as fault conditions. The LT8610AX is available in n Oil and Gas Exploration small 16-lead MSOP package with exposed pad for low thermal resistance. L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 3.3V Step-Down Converter Efciency at 175CEfficiency at 175C 100 90 V V BST IN IN 3.7V TO 42V 4.7F 0.1F 80 4.7H EN/UV V OUT SW 3.3V 70 LT8610AX 3.5A 100nF 47F BIAS 60 2 49.9k TR/SS PG 1210 50 1F 100k X7R 40 FB INTV CC 10pF 30 RT GND SYNC 20 T = 175C A 41.2k 60.4k 12V IN 10 0 8610AX TA01a f = 700kHz SW 1 10 100 1k 10k LOAD CURRENT (mA) 8610AX TA01b 8610axf 1 For more information www.linear.com/LT8610AX EFFICIENCY (%)LT8610AX ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) V , EN/UV, PG ..........................................................42V IN TOP VIEW BIAS ..........................................................................30V SYNC 1 16 FB 2 15 PG TR/SS FB, TR/SS Voltage ......................................................4V RT 3 14 BIAS 4 17 13 INTV EN/UV CC SYNC Voltage ...........................................................6V V 5 GND 12 BST IN 6 11 SW V IN Operating Junction Temperature Range (Note 2) NC 7 10 SW 8 9 SW GND LT8610AX .............................................. 40 to 175C MSE PACKAGE Storage Temperature Range ......................65 to 150C 16-LEAD PLASTIC MSOP = 40C/W, = 10C/W JA JC(PAD) EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION (