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LTC3862HFE-1-PBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC3862HFE-1-PBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 40 page LTC3862-1 1 38621f TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Multi-Phase Current Mode Step-Up DC/DC Controller The LTC ®3862-1 is a two phase constant frequency, current mode boost and SEPIC controller that drives N-channel power MOSFETs. Two phase operation reduces system filtering capacitance and inductance requirements. The 10V gate drive is optimized for most automotive and industrial grade power MOSFETs. Adjustable slope compensation gain allows the user to fine- tune the current loop gain, improving noise immunity. The operating frequency can be set with an external resistor over a 75kHz to 500kHz range and can be synchronized to an external clock using the internal PLL. Multi-phase operation is possible using the SYNC input, the CLKOUT output and the PHASEMODE control pin allowing 2-, 3-, 4-, 6- or 12-phase operation. Other features include an internal 10V LDO with undervoltage lockout protection for the gate drivers, a precision RUN pin threshold with programmable hyster- esis, soft-start and programmable leading edge blanking and maximum duty cycle. The LTC3862 is a 5V gate drive version of the LTC3862-1. n Wide VIN Range: 8.5V to 36V Operation n 2-Phase Operation Reduces Input and Output Capacitance n Fixed Frequency, Peak Current Mode Control n 10V Gate Drive for High Voltage MOSFETs n Adjustable Slope Compensation Gain n Adjustable Max Duty Cycle (Up to 96%) n Adjustable Leading Edge Blanking n ±1% Internal Voltage Reference n Programmable Operating Frequency with One External Resistor (75kHz to 500kHz) n Phase-Lockable Fixed Frequency 50kHz to 650kHz n SYNC Input and CLKOUT for 2-, 3-, 4-, 6- or 12-Phase Operation (PHASEMODE Programmable) n Internal 10V LDO Regulator n 24-Lead Narrow SSOP Package n 5mm × 5mm QFN Package with 0.65mm Lead Pitch n 24-Lead Thermally Enhanced TSSOP Package n Automotive, Telecom and Industrial Power Supplies L, LT, LTC and LTM 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. Efficiency vs Output Current LOAD CURRENT (mA) 38621 TA01b 100 90 92 94 96 98 80 82 84 86 88 100 1000 10000 VIN = 32V VOUT = 72V VIN = 24V VIN = 9V VIN LTC3862-1 SGND GATE1 SENSE1+ RUN 150k 24.9k 45.3k 324k 5.62k 45.3k 100pF 0.020Ω 0.020Ω 56μH 56μH 22μF 50V 110μF 100V 0.1μF 1nF 1.5nF 4.7μF INTVCC SS 3V8 ITH FB VOUT 72V 2A (MAX) 38621 TA01a VIN 8.5V TO 36V BLANK FREQ SYNC PLLFLTR SENSE1– GATE2 SENSE2+ SENSE2– PGND CLKOUT SLOPE DMAX PHASEMODE |
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