LTC3862 Multi-Phase Current Mode Step-Up DC/DC Controller Fea T Descrip T n Wide V Range: 4V to 36V Operation The LTC 3862 is a two phase constant frequency, current IN n 2-Phase Operation Reduces Input and Output mode boost and SEPIC controller that drives N-channel Capacitance power MOSFETs. Two phase operation reduces system n Fixed Frequency, Peak Current Mode Control filtering capacitance and inductance requirements. n 5V Gate Drive for Logic-Level MOSFETs The operating frequency can be set with an external resistor n Adjustable Slope Compensation Gain over a 75kHz to 500kHz range and can be synchronized n Adjustable Max Duty Cycle (Up to 96%) to an external clock using the internal PLL. Multi-phase n Adjustable Leading Edge Blanking operation is possible using the SYNC input, the CLKOUT n 1% Internal Voltage Reference output and the PHASEMODE control pin allowing 2-, 3-, n Programmable Operating Frequency with One 4-, 6- or 12-phase operation. External Resistor (75kHz to 500kHz) n Other features include an internal 5V LDO with undervoltage Phase-Lockable Fixed Frequency 50kHz to 650kHz n lockout protection for the gate drivers, a precision RUN SYNC Input and CLKOUT for 2-, 3-, 4-, 6- or pin threshold with programmable hysteresis, soft-start 12-Phase Operation (PHASEMODE Programmable) n and programmable leading edge blanking and maximum Internal 5V LDO Regulator n duty cycle. 24-Lead Narrow SSOP Package n 5mm 5mm QFN with 0.65mm Lead Pitch and PART NUMBER INTV V ON V OFF CC IN IN 24-Lead Thermally Enhanced TSSOP Packages LTC3862 5V 3.3V 2.9V LTC3862-1 10V 7.5V 7.0V a T LTC3862-2 10V 4.4V 3.9V n Automotive, Telecom and Industrial Power Supplies L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6144194, 6498466, 6611131. Typical a T V IN 5V TO 36V 22F 84.5k 19.4H 19.4H 50V V OUT 48V Efficiency vs Output Current 24.9k V IN 5A (MAX) RUN GATE1 98 + V = 48V OUT INTV SENSE1 CC 96 V = 12V 220F IN 4.7F LTC3862 0.006 50V 94 BLANK SENSE1 66.5k 92 FREQ GATE2 10nF SYNC 90 10k + SENSE2 V = 24V IN PLLFLTR 10nF 88 0.006 V = 5V IN SS 86 SENSE2 1nF 3V8 PGND 84 CLKOUT 82 FB SLOPE 10nF D MAX 80 ITH PHASEMODE 100 1000 10000 SGND 475k 12.4k 68.1k 100pF LOAD CURRENT (mA) 3862 TA01b 3862 TA01 3862fc For more information www.linear.com/LTC3862 1 EFFICIENCY (%) ion pplica ions pplica ion uresLTC3862 a Te Maxi Mu M r a T (Notes 1, 2) Input Supply Voltage (V ) ......................... 0.3V to 40V ITH Voltage ............................................... 0.3V to 2.7V IN INTV Voltage ............................................ 0.3V to 6V FB Voltage ................................................. 0.3V to V CC 3V8 INTV LDO RMS Output Current .........................50mA FREQ Voltage ............................................ 0.3V to 1.5V CC RUN Voltage ................................................ 0.3V to 8V Operating Junction Temperature Range (Notes 3, 4) SYNC Voltage ............................................... 0.3V to 6V LTC3862E ............................................. 40C to 85C SLOPE, PHASEMODE, D , LTC3862I............................................ 40C to 125C MAX BLANK Voltage .......................................... 0.3V to V LTC3862H .......................................... 40C to 150C 3V8 + + SENSE1 , SENSE1 , SENSE2 , Storage Temperature Range ................... 65C to 150C SENSE2 Voltage ...................................... 0.3V to V Reflow Peak Body Temperature ........................... 260C 3V8 SS, PLLFLTR Voltage ................................ 0.3V to V 3V8 p in c F T TOP VIEW TOP VIEW TOP VIEW D 1 24 3V8 MAX D 1 24 3V8 MAX + 2 23 SENSE1 SLOPE + 2 23 SENSE1 SLOPE 3 22 SENSE1 BLANK 24 23 22 21 20 19 3 22 SENSE1 BLANK 4 21 RUN PHASEMODE BLANK 1 18 V IN 4 21 RUN PHASEMODE 5 20 V FREQ IN PHASEMODE 2 17 INTV CC 5 20 V FREQ IN 6 19 INTV FREQ GATE1 SS CC 3 16 6 19 INTV SS CC 25 25 7 18 GATE1 SS 4 15 PGND ITH 7 18 GATE1 ITH ITH 5 14 GATE2 8 17 PGND FB 8 17 PGND FB FB 6 13 NC SGND 9 16 GATE2 SGND 9 16 GATE2 CLKOUT 10 15 NC 7 8 9 10 11 12 CLKOUT 10 15 NC SYNC 11 14 SENSE2 SYNC 11 14 SENSE2 + PLLFLTR 12 13 SENSE2 + PLLFLTR 12 13 SENSE2 UH PACKAGE FE PACKAGE GN PACKAGE 24-LEAD (5mm 5mm) PLASTIC QFN 24-LEAD PLASTIC TSSOP 24-LEAD NARROW PLASTIC SSOP T = 150C, = 44C/W JMAX JA T = 150C, = 38C/W JMAX JA T = 150C, = 85C/W JMAX JA EXPOSED PAD (PIN 25) IS PGND, MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 25) IS PGND, MUST BE SOLDERED TO PCB Der in F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3862EFE PBF LTC3862EFE TRPBF 3862FE 24-Lead Plastic TSSOP 40C to 85C LTC3862IFE PBF LTC3862IFE TRPBF 3862FE 24-Lead Plastic TSSOP 40C to 125C LTC3862HFE PBF LTC3862HFE TRPBF 3862FE 24-Lead Plastic TSSOP 40C to 150C LTC3862EGN PBF LTC3862EGN TRPBF LTC3862GN 24-Lead Plastic SSOP 40C to 85C LTC3862IGN PBF LTC3862IGN TRPBF LTC3862GN 24-Lead Plastic SSOP 40C to 125C LTC3862HGN PBF LTC3862HGN TRPBF LTC3862GN 24-Lead Plastic SSOP 40C to 150C LTC3862EUH PBF LTC3862EUH TRPBF 3862 24-Lead (5mm 5mm) Plastic QFN 40C to 85C LTC3862IUH PBF LTC3862IUH TRPBF 3862 24-Lead (5mm 5mm) Plastic QFN 40C to 125C LTC3862HUH PBF LTC3862HUH TRPBF 3862 24-Lead (5mm 5mm) Plastic QFN 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: