LTC3869-2 Datasheet | Linear Technology

Features n Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise n Accurate Multiphase Current Matching n RSENSE or DCR Current Sensing n ±0.75% 0.6V Output Voltage Accuracy n Phase-Lockable Fixed Frequency 250k Hz to 780k Hz n High Efficiency: Up to 95% n Dual N-channel MOSFET Synchronous Drive n Wide VIN Range: 4V to 38V (40V Max) Operation n Wide VOUT Range: 0.6V to 12.5V Operation n Adjustable Soft-Start Current Ramping or Tracking n Foldback Output Current Limiting n Output Overvoltage Protection n Power Good Output Voltage Monitor n 5V Low Dropout Regulator n Small 28-Lead QFN and Narrow SSOP Packages Applications n Server Systems n Tele Systems n Industrial and Medical Instruments n High Power Battery-Operated Devices n DC Power Distribution Systems LTC3869/LTC3869-2 Dual, 2-Phase Synchronous Step-Down DC/DC Controllers Description The LTC®3869 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 phaselockable frequency of up to 780k Hz. 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® pensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. A wide 4V to 38V input supply range enpasses most battery chemistries. Independent TK/ SS pins for each controller ramp the output voltage during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. 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. The LTC3869 is available in low profile 4mm × 4mm and 4mm × 5mm QFN packages. The LTC3869-2 is available in an SSOP-28 package. The LTC3869 is pin-patible with the LTC3850. L, LT,...