POWER LOSS (W) LTC7841 PolyPhase Synchronous Boost Controller with PMBus Interface FEATURES DESCRIPTION n Wide V Range: 4.5V to 60V The LTC 7841 is a high performance PolyPhase single IN n 1% Total Output Voltage Accuracy Over output synchronous boost converter controller that drives Temperature at V = 12V two N-channel power MOSFET stages out-of-phase. IN n PMBus Compliant Serial Interface: Multiphase operation reduces input and output capaci- n Programmable V : tor requirements and allows the use of smaller inductors OUT Upto 60V with 0.2% Resolution than the single-phase equivalent. Synchronous rectifica- n Read Back of Average and Peak Temperature, tion increases efficiency, reduces power loss and eases Current, and Voltage (25Hz Refresh Rate) thermal requirements, enabling high power boost applica- n Fault Status tions. The output voltage can be adjusted up to 60V with n Phase-Lockable Frequency: 75kHz to 850kHz 0.2% resolution via a PMBus-compliant serial interface. n Less than 1ms Power-Up Time The serial interface can also be used to read back fault n Power Good Output Voltage Monitor status, input/output current, input/output voltage and n Internal LDO Powers Gate Driver from VBIAS or EXTV temperature. System configuration and monitoring is CC n Low Shutdown Current: I < 10A supported by the LTpowerPlay development system. Q n Clock Out for 4-Phase Operation (40A Output Current) PolyPhase operation allows the LTC7841 to be configured n Available in a Thermally-Enhanced 5mm x 6mm QFN for 2-, 3-, 4-, 6-, and 12-phase operation. n AEC-Q100 Qualification In Progress All registered trademarks and trademarks are the property of their respective owners. Protected by U. S. Patents, including 5408150, 5481178, 5705919, 5929620, 6144194, 6177787, 6580258. APPLICATIONS n Automotive Systems, Medical, Industrial TYPICAL APPLICATION 3.3H 4m + SENSE1 47F SENSE1 BG1 Efficiency and Power Loss vs Output Current BOOST1 100 6 0.1F V V VBIAS IN OUT 24V AT 10A 4.5V TO 60V 98 SW1 5 220F 96 TG1 LTC7841 94 4 INTV CC 92 V OUT 3.3H 4.7F 4m FOLLOWS V IN 90 3 BURST EFFICIENCY ALERT FOR V > 24V IN PMBUS BURST LOSS SDA 88 + 0.1F SENSE2 SCL 2 V = 12V IN SENSE2 86 SS V = 24V OUT 470pF BG2 84 Burst Mode OPERATION 1 FIGURE 21 CIRCUIT CSLEW 82 BOOST2 80 0 FREQ 0.1F 0.01 0.1 1 10 ASEL SW2 LOAD CURRENT (A) TG2 PLLIN/MODE 7841 F10b V OUT ITH VFB 7841 TA01a 15nF SGND PGND 232k 12.1k 8.66k 100pF Rev. A 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LTC7841 TABLE OF CONTENTS Features ............................................................................................................................ 1 Applications ....................................................................................................................... 1 Typical Application ............................................................................................................... 1 Description......................................................................................................................... 1 Absolute Maximum Ratings ..................................................................................................... 3 Order Information ................................................................................................................. 3 Pin Configuration ................................................................................................................. 3 Electrical Characteristics ........................................................................................................ 4 Typical Performance Characteristics .......................................................................................... 8 Pin Functions .....................................................................................................................12 Block Diagram ....................................................................................................................14 Command Table ..................................................................................................................15 Operation..........................................................................................................................16 Serial Interface ...................................................................................................................................................... 20 Applications Information .......................................................................................................24 2 Connecting the USB to I C/SMBus/PMBus Controller to the LTC7841 In System ................................................ 35 LTpowerPlay: An Interactive GUI for Digital Power ............................................................................................... 35 PMBus Command Details ......................................................................................................41 Typical Applications .............................................................................................................46 Package Description ............................................................................................................48 Revision History .................................................................................................................49 Typical Application ..............................................................................................................50 Related Parts .....................................................................................................................50 Rev. A 2 For more information www.analog.com