LTC3869IUFD#PBF

LTC3869 is a high performance dual synchronous step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phase lockable frequency of up to 780KHz. Power loss and noise due to the ESR of the input capacitors are minimized by operating the two controller output stages out-of-phase. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. Independent TK/SS pins for each controller ramp the output voltage during start-up. The MODE/PLLIN pin selects among Burst Mode® operation, pulse-skipping mode, or continuous inductor current mode and allows the IC to be synchronized to an external clock. Typical applications are server systems, telecom systems, industrial and medical instruments, high power battery-operated devices, DC power distribution systems.

• Dual, 180° phased controllers reduce required input capacitance and power supply induced noise
• Accurate multiphase current matching, RSENSE or DCR current sensing
• ±0.75% 0.6V output voltage accuracy, phase-lockable fixed frequency 250KHz to 780KHz
• Foldback output current limiting, output overvoltage protection
• Adjustable soft-start current ramping or tracking, dual N-channel MOSFET synchronous drive
• Power good output voltage monitor, 5V low dropout regulator
• Input voltage range from 4 to 38V, output voltage range from 0.6 to 12.5V
• 28-lead plastic QFN package
• Temperature rating range from –40°C to 125°C

附註

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