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LTC3862HUH-PBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC3862HUH-PBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 40 page LTC3862 1 3862fb TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Multi-Phase Current Mode Step-Up DC/DC Controller The LTC ®3862 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 5V 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 5V LDO with undervoltage lockout protection for the gate drivers, a precision RUN pin threshold with programmable hysteresis, soft-start and programmable leading edge blanking and maximum duty cycle n Wide VIN Range: 4V to 36V Operation n 2-Phase Operation Reduces Input and Output Capacitance n Fixed Frequency, Peak Current Mode Control n 5V Gate Drive for Logic-Level 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 5V LDO Regulator n 24-Lead Narrow SSOP Package n 5mm × 5mm QFN with 0.65mm Lead Pitch and 24-Lead Thermally Enhanced TSSOP Packages 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. VIN LTC3862 SGND GATE1 SENSE1+ RUN 84.5k 24.9k 66.5k 10nF 10k 475k 12.4k 68.1k 100pF 0.006Ω 0.006Ω 19.4μH 19.4μH 22μF 50V 220μF 50V 10nF 1nF 10nF 4.7μF INTVCC SS 3V8 ITH FB VOUT 48V 5A (MAX) 3862 TA01 VIN 5V TO 36V BLANK FREQ SYNC PLLFLTR SENSE1– GATE2 SENSE2+ SENSE2– PGND CLKOUT SLOPE DMAX PHASEMODE Efficiency vs Output Current LOAD CURRENT (mA) 100 80 82 84 86 90 94 1000 10000 3862 TA01b 98 88 92 96 VOUT = 48V VIN = 24V VIN = 12V VIN = 5V |
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