LTC3856 Datasheet | Linear Technology

Features n Poly Phase® Controller Reduces Input and Output Capacitance and Power Supply Induced Noise n Wide VIN Range: 4.5V to 38V Operation n ±0.75%, 0.6V Reference Voltage Accuracy n High Efficiency: Up to 95% n Programmable Burst Mode® Operation or Stage Shedding™ for Highest Light Load Efficiency n Active Voltage Positioning (AVP) n RSENSE or DCR Current Sensing n Programmable DCR Temperature pensation n Phase-Lockable Fixed Frequency: 250k Hz to 770k Hz n True Remote Sense Differential Amplifier n Dual N-Channel MOSFET Synchronous Drive n VOUT Range: 0.6V to 5V without Differential Amplifier n VOUT Range: 0.6V to 3.3V with Differential Amplifier n Adjustable Soft-Start or VOUT Tracking n Stackable for Up to 12-Phase Operation n 32-Pin (5mm × 5mm) QFN and 38-Pin TSSOP Packages Applications n Tele and Data Systems n Industrial and Medical Instruments n DC Power Distribution Systems n puter Systems 2-Phase Synchronous Step-Down DC/DC Controller with Diffamp Description The LTC®3856 is a single output, dual channel Poly Phase synchronous step-down DC/DC controller that drives all N-channel power MOSFET stages. This device includes a high speed differential amplifier for remote output voltage sense. Power loss and supply noise are minimized by operating the two controller output stages out-of-phase and up to 12-phase operation can be achieved. The LTC3856 monitors the output current by sensing the voltage drop across the output inductor (DCR) or by using a sense resistor. DCR temperature pensation maintains an accurate current sense threshold over a broad temperature range. A constant-frequency, current mode architecture allows a phase-lockable frequency of up to 770k Hz. A wide 4.5V to 38V input supply range enpasses most intermediate bus voltages and battery chemistries. Burst Mode operation, continuous or Stage Shedding modes are supported. A TK/SS pin shared by both channels ramps the output voltage during start-up. L, LT, LTC, LTM,...