POWERLOSS (W) LTC3882 Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management FEATURES DESCRIPTION 2 n PMBus/I C Compliant Serial Interface The LTC 3882 is a dual, PolyPhase DC/DC synchronous Monitor Voltage, Current, Temperature and Faults step-down switching regulator controller with PMBus Digitally Programmable Voltage, Current Limit, compliant serial interface. It uses a constant frequency, Soft-Start/Stop, Sequencing, Margining, AVP leading-edge modulation, voltage mode architecture for and UV/OV Thresholds excellent transient response and output regulation. Each n 3V VINSNS 38V, 0.5V V 5.25V PWM channel can produce output voltages from 0.5V to OUT n 0.5% Output Voltage Accuracy 5.25V using a wide range of 3.3V compatible power stages, n Programmable PWM Frequency or External Clock including power blocks, DrMOS or discrete FET drivers. Synchronization from 250kHz to 1.25MHz Up to four LTC3882s can operate in parallel for 2-, 3-, 4-, n Accurate PolyPhase Current Sharing 6- or 8-phase operation. n Internal EEPROM with Fault Logging LTC3882 system configuration and monitoring is supported n IC Supply Range: 3V to 13.2V by the LTpowerPlay software tool. The devices serial n Resistor or Inductor DCR Current Sensing interface can be used to read back input voltage, output n Optional Resistor Programming for Key Parameters voltage and current, temperature and fault status. A wide n 40-Pin (6mm 6mm) QFN Package range of operating parameters can be set via the digital interface or stored in internal EEPROM for use at power APPLICATIONS up. Switching frequency and phase, output voltage and n High Current Distributed Power Systems device address can also be programmed using external n Servers, Network and Storage Equipment configuration resistors. n Intelligent Energy Efficient Power Regulation L, LT, LTC, LTM, Linear Technology,the Linear logo and PolyPhase are registered trademarks and LTpowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the n Industrial/Telecom/ATE Systems property of their respective owners. Protected by U.S. Patents, including 5396245, 5859606, 6144194, 6937178, 7420359 and 7000125. TYPICAL APPLICATION V IN 7V TO 13.2V V VINSNS + CC V SENSE0 Efficiency and Power Loss vs FB0 V FDMF5820A IN Load Current LTC3882 92 13 V OUT PWM SW 1V 91 SDA COMP0 80A 90 11 SCL COMP1 89 ALERT TO/FROM GND PWM0 88 9 MCU RUN0 TSNS0 87 RUN1 + 86 7 WP I SENSE0 GPIO0 I 85 TO/FROM SENSE0 + EXTERNAL DEVICES GPIO1 V SENSE1 84 5 TO/FROM OTHER SHARE CLK I SENSE1 83 OTHER PHASES + SYNC I V = 12V SENSE1 82 3 IN V = 1V OUT 81 I FDMF5820A AVG0 V SYNC = 500kHz IN 80 1 SW I AVG1 PWM1 PWM 0 10 20 30 40 50 60 70 80 GND LOAD CURRENT (A) TSNS1 3882 TA01b I AVG GND V SENSE0 GND INDUCTORS: COOPER FP1007R1-R22 3882 TA01a SOME DETAILS OMITTED FOR CLARITY 3882f 1 For more information www.linear.com/LTC3882 This datasheet has been downloaded from LTC3882-1 - Dual Output PolyPhase Step- Down DC/DC Voltage Mode Controller with Digital Power System Management Features 2 PMBus/I C Compliant Serial Interface Monitor Voltage, Current, Temperature and Faults Program Voltage, Soft-Start/Stop, Sequencing, Margining, AVP and UV/OV/OC Limits 3V VINSNS 38V, 0.5V V 5.25V OUT 0.5% Output Voltage Error Programmable PWM Frequency or External Clock Synchronization from 250kHz to 1.25MHz Accurate PolyPhase Current Sharing Internal EEPROM with Fault Logging IC Supply Range: 3V to 13.2V Resistor or Inductor DCR Current Sensing Power Good Output Voltage Monitor Optional Resistor Programming for Key Parameters 40-Pin (6mm 6mm) QFN Package Typical Application