Features

• Wide V_IN Range: 8.5V to 36V Operation
• 2-Phase Operation Reduces Input and Output Capacitance
• Fixed Frequency, Peak Current Mode Control
• 10V Gate Drive for High Voltage MOSFETs
• 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)
• Internal 10V LDO Regulator
• 24-Lead Narrow SSOP Package
• 5mm × 5mm QFN Package with 0.65mm Lead Pitch
• 24-Lead Thermally Enhanced TSSOP Package

Typical Application

Description

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 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.