Catalog
Multi-Phase Current Mode Step-Up DC/DC Controller
Key Features
• Wide VINRange: 5.5V to 36V Operation
• 2-Phase Operation Reduces Input and Output Capacitance
• Fixed Frequency, Peak Current Mode Control
• Internal 10V LDO Regulator
• Lower UVLO Thresholds Allows the Use of MOSFETs Rated at 6V VGS
• Adjustable Slope Compensation Gain
• Adjustable Max Duty Cycle (Up to 96%)
• Adjustable Leading Edge Blanking
• ±1% Internal Voltage Reference
• Programmable Operating Frequency with One External Resistor (75kHz to 500kHz)
• Phase-Lockable Fixed Frequency 50kHz to 650kHz
• SYNC Input and CLKOUT for 2-, 3-, 4-, 6- or 12-Phase Operation (PHASEMODE Programmable)
• 24-Lead Narrow SSOP Package
• 5mm × 5mm QFN Package with 0.65mm Lead Pitch
• 24-Lead Thermally Enhanced TSSOP Package
Description
AI
The LTC3862-1 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 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 hysteresis, soft-start and programmable leading edge blanking and maximum duty cycle.Part NumberVINRangeINTVCCUV+UV–LTC38624V to 36V5V3.3V2.9VLTC3862-18.5V to 36V10V7.5V7.0VLTC3862-25.5V to 36V10V4.4V3.9VApplicationsAutomotive, Telecom and Industrial Power Supplies