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LTC4449 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4449 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 108 page  LTC3882-1 1 Rev A For more information www.analog.com Document Feedback TYPICAL APPLICATION FEATURES DESCRIPTION Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management The LTC®3882-1 is a dual, PolyPhase DC/DC synchronous step-down switching regulator controller with PMBus compliant serial interface. It uses a constant frequency, leading-edge modulation, voltage mode architecture for excellent transient response and output regulation. Each PWM channel can produce output voltages from 0.5V to 5.25Vusingawiderangeof3.3Vcompatiblepowerstages, including power blocks, DrMOS or discrete FET drivers. Up to four LTC3882-1 devices can operate in parallel for 2-, 3-, 4-, 6- or 8-phase operation. System configuration and monitoring is supported by the LTpowerPlay™softwaretool.TheLTC3882-1serialinterface can read back input voltage, output voltage and current, temperatureandfaultstatus.Mostoperatingparameterscan be set via the digital interface or stored in internal EEPROM for use at power up. Switching frequency and phase, output voltage and device address can also be set using external configuration resistors. n PMBus/I2C Compliant Serial Interface – Monitor Voltage, Current, Temperature and Faults – Program Voltage, Soft-Start/Stop, Sequencing, Margining, AVP and UV/OV/OC Limits n 3V ≤ VINSNS ≤ 38V, 0.5V ≤ VOUT ≤ 5.25V n ±0.5% Output Voltage Error n Programmable PWM Frequency or External Clock Synchronization from 250kHz to 1.25MHz n Accurate PolyPhase® Current Sharing n Internal EEPROM with Fault Logging and ECC n IC Supply Range: 3V to 13.2V n Resistor or Inductor DCR Current Sensing n Power Good Output Voltage Monitor n Optional Resistor Programming for Key Parameters n 40-Pin (6mm × 6mm) QFN Package All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. Patents, including 5396245, 5859606, 6144194, 6937178, 7420359 and 7000125. APPLICATIONS n High Current Distributed Power Systems n Servers, Network and Storage Equipment n Intelligent Energy Efficient Power Regulation LTC3882-1 SDA RUN1 ISENSE0+ ISENSE0– VSENSE0+ VSENSE0– VSENSE1– RUN0 FAULT1 FAULT0 FB0 COMP0 TSNS0 TSNS1 GND 38821 TA01a IAVG_GND PWM0 VSENSE1+ ISENSE1– ISENSE1+ PWM1 VIN 7V TO 13.2V TO/FROM MCU SCL ALERT COMP1 VCC VINSNS FDMF5820DC FDMF5820DC INDUCTORS: COOPER FP1007R1-R22 SOME DETAILS OMITTED FOR CLARITY PWM VIN VOUT 1V 70A SW GND IAVG1 IAVG0 TO/FROM EXTERNAL DEVICES PGOOD1 SYNC SHARE_CLK PGOOD0 PWM VIN SW GND Load Step Transient Current Sharing (Using FDMF5820DC DrMOS) PWM ENABLE OUTPUT TG/BG CONTROL HW WRITE PROTECT DEDICATED PGOOD OUTPUT DIFFERENTIAL VOUT SENSE LTC3882 • • • VOUT0 Only LTC3882-1 • VOUT0 & VOUT1 50µs/DIV IOUT 10A/DIV IL0, IL1 10A/DIV 38821 TA01b |
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