LTC3862-2 Multi-Phase Current Mode Step-Up DC/DC Controller Fea T Descrip T n Wide V Range: 5.5V to 36V Operation The LTC 3862-2 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 Internal 10V LDO Regulator The operating frequency can be set with an external resistor n Lower UVLO Thresholds Allows the Use of over a 75kHz to 500kHz range and can be synchronized MOSFETs Rated at 6V V GS to an external clock using the internal PLL. Multiphase n Adjustable Slope Compensation Gain operation is possible using the SYNC input, the CLKOUT n Adjustable Max Duty Cycle (Up to 96%) output and the PHASEMODE control pin allowing 2-, 3-, n Adjustable Leading Edge Blanking 4-, 6- or 12-phase operation. n 1% Internal Voltage Reference n Other features include an internal 10V LDO with under- Programmable Operating Frequency with One voltage lockout protection for the gate drivers, a preci- External Resistor (75kHz to 500kHz) n sion RUN pin threshold with programmable hysteresis, Phase-Lockable Fixed Frequency 50kHz to 650kHz n soft-start and programmable leading edge blanking and SYNC Input and CLKOUT for 2-, 3-, 4-, 6- or maximum duty cycle. 12-Phase Operation (PHASEMODE Programmable) n 24-Lead Narrow SSOP Package PART NUMBER INTV V ON V OFF CC IN IN n 5mm 5mm QFN Package with 0.65mm Lead Pitch LTC3862 5V 3.3V 2.9V n 24-Lead Thermally Enhanced TSSOP Package LTC3862-1 10V 7.5V 7.0V LTC3862-2 10V 4.4V 3.9V a T L, LT, LTC, LTM, Linear Technology, the Linear logo and PolyPhase are registered trademarks and No R and ThinSOT are trademarks of Linear Technology Corporation. All other SENSE n Automotive, Telecom and Industrial Power Supplies trademarks are the property of their respective owners. Protected by U.S. Patents, including 6144194, 6498466, 6611131. Typical a T V IN 6V TO 32V 22F Efficiency vs Output Current 100k 16H 16H 50V V OUT 97 V = 80V OUT 80V 24.9k V IN 7A (MAX) 95 RUN GATE1 93 + INTV SENSE1 CC 210F 91 4.7F LTC3862-2 0.0033 100V 89 BLANK SENSE1 110k 87 FREQ GATE2 85 SYNC + SENSE2 PLLFLTR 83 0.1F V = 6V IN 0.0033 81 V = 9V IN SS V = 12V SENSE2 IN 1nF 79 V = 24V 3V8 IN PGND 77 CLKOUT 10 100 1000 10000 FB SLOPE LOAD CURRENT (mA) 10nF D MAX 38622 TA01b ITH PHASEMODE SGND 796k 12.4k 12.1k 220pF 38622 TA01a 38622fa 1 For more information www.linear.com/LTC3862-2 EFFICIENCY (%) ion pplica ions pplica ion uresLTC3862-2 a Te Maxi Mu M r a T (Notes 1, 2) Input Supply Voltage (V ) ......................... 0.3V to 40V SS, PLLFLTR Voltage ................................ 0.3V to V IN 3V8 INTV Voltage ..........................................0.3V to 11V ITH Voltage ............................................... 0.3V to 2.7V CC INTV LDO RMS Output Current .........................50mA FB Voltage ................................................. 0.3V to V CC 3V8 RUN Voltage................................................. 0.3V to 8V FREQ Voltage ............................................ 0.3V to 1.5V SYNC Voltage ............................................... 0.3V to 6V Operating Junction Temperature Range (Notes 3, 4) SLOPE, PHASEMODE, D , LTC3862-2E .........................................40C to 85C MAX BLANK Voltage ......................................... 0.3V to V LTC3862-2I ........................................ 40C to 125C 3V8 + + SENSE1 , SENSE1 , SENSE2 , LTC3862-2H ....................................... 40C to 150C SENSE2 Voltage ...................................... 0.3V to V Storage Temperature Range .................. 65C to 150C 3V8 Reflow Peak Body Temperature ...........................260C p in c F T TOP VIEW TOP VIEW TOP VIEW D 1 24 3V8 MAX D 1 24 3V8 MAX + SLOPE 2 23 SENSE1 + SLOPE 2 23 SENSE1 BLANK 3 22 SENSE1 24 23 22 21 20 19 BLANK 3 22 SENSE1 PHASEMODE 4 21 RUN BLANK 1 18 V IN PHASEMODE 4 21 RUN FREQ 5 20 V PHASEMODE 2 17 INTV IN CC FREQ 5 20 V IN FREQ GATE1 SS 6 19 INTV 3 16 CC SS 6 19 INTV CC 25 25 SS 4 15 PGND ITH 7 18 GATE1 PGND PGND ITH 7 18 GATE1 ITH 5 14 GATE2 FB 8 17 PGND FB 8 17 PGND 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 38622fa 2 For more information www.linear.com/LTC3862-2 SGND SLOPE CLKOUT DMAX SYNC 3V8 + PLLFLTR SENSE1 + SENSE2 SENSE1 SENSE2 RUN ion igura on ings bsolu