Datasheet LTC3882 (Analog Devices) - 9

LTC3882
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs Load Current Efficiency vs Load Current Efficiency and Power Loss vs (1-Phase Using D12S1R880A (3-Phase Using D12S1R845A Input Voltage Power Block) Power Block) (1-Phase Using LTC4449)
95 94 100 3.0 VIN = 12V VIN = 12V VO = 1.8V V 98 92 OUT = 1.5V 2.5 96 90 90 94 POWERLOSS (W) 2.0 88 92 85 90 1.5 86 88 EFFICIENCY (%) 3.3V EFFICIENCY (%) EFFICIENCY (%) 1.0 2.5V 84 86 80 1.8V 84 1.5V 82 0.5 1.2V 82 POWER FET: BSC050N04LS G 1.0V SYNC FET: BSC010N04LS 75 80 80 0 0 10 20 30 40 0 10 20 30 40 50 60 70 5 10 15 20 25 30 LOAD CURRENT (A) LOAD CURRENT (A) VIN (V) 3882 G01 3882 G02 3882 G03
Typical Distribution of Slave Typical Distribution of Slave Typical Distribution of Slave IOUT Offset (Not Including DCR IOUT Offset (Not Including DCR IOUT Offset (Not Including DCR Mismatch) Mismatch) Mismatch)
4000 3500 4500 9595 UNITS 8593 UNITS 11783 UNITS 3500 FROM 3 LOTS FROM 3 LOTS 4000 FROM 3 LOTS T 3000 A = –40°C TJ = 38°C TJ = 121°C 3000 TJ = –22°C CHO MASTER 3500 CHO MASTER CHO MASTER 2500 3000 2500 2000 2500 2000 1500 2000 NUMBER OF ICs 1500 NUMBER OF ICs NUMBER OF ICs 1500 1000 1000 1000 500 500 500 0 0 0 –400–300–200–100 0 100 200 300 400 –400–300–200–100 0 100 200 300 400 –300–200–100 0 100 200 300 400 500 CH1 ISENSE OFFSET TO IDEAL (µV) CH1 ISENSE OFFSET TO IDEAL (µV) CH1 ISENSE OFFSET TO IDEAL (µV) 3882 G25 3882 G25 3882 G26
3-Phase DC Output Current Load Step Transient Current Load Dump Transient Current Sharing (Using D12S1R845A Sharing (Using FDMF6707B Sharing (Using FDMF6707B Power Block DrMOS) DrMOS)
20 CHANNEL 1 18 CHANNEL 2 IOUT IOUT CHANNEL 3 20A/DIV 20A/DIV 16 V 14 OUT VOUT 20mV/DIV 12 20mV/DIV 10 IL1, IL2 IL1, IL2 10A/DIV 10A/DIV 8 PHASE CURRENT (A) 6 4 V 3882 G05 3882 G06 OUT = 1V 5µs/DIV VOUT = 1V 5µs/DIV V V 2 IN = 12V IN = 12V SYNC = 500kHz SYNC = 500kHz 0 L = 320nH L = 320nH 0 10 20 30 40 50 60 70 80 TOTAL RAIL CURRENT (A) 3882 G04 Rev. C For more information www.analog.com 9 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Block Diagram Test Circuit Timing Diagram Operation Overview Main Control Loop Power-Up and Initialization Soft-Start Time-Based Output Sequencing Output Ramping Control Voltage-Based Output Sequencing Output Disable Minimum Output Disable Times Output Short Cycle Light Load Current Operation Switching Frequency and Phase PolyPhase Load Sharing Active Voltage Positioning Input Supply Monitoring Output Voltage Sensing and Monitoring Output Current Sensing and Monitoring External and Internal Temperature Sense Resistor Configuration Pins Internal EEPROM with ECC and CRC Fault Detection Input Supply Faults Hardwired PWM Response to VOUT Faults Power Good Indication Hardwired PWM Response to IOUT Faults Hardwired PWM Response to Temperature Faults Hardwired PWM Response to Timing Faults External Faults Fault Handling Status Registers and ALERT Masking Mapping Faults to GPIO Pins Other GPIO Uses Fault Logging Factory Default Operation Serial Interface Serial Bus Addressing Serial Bus Timeout Serial Communication Errors PMBus Command Summary PMBus Commands Data Formats Applications Information Efficiency Considerations PWM Frequency and Inductor Selection Power MOSFET Selection MOSFET Driver Selection Using PWM Protocols CIN Selection COUT Selection Feedback Loop Compensation PCB Layout Considerations Output Current Sensing Output Voltage Sensing Soft-Start and Stop Time-Based Output Sequencing and Ramping Voltage-Based Output Sequencing Using Output Voltage Servo Using AVP PWM Frequency Synchronization PolyPhase Operation and Load Sharing External Temperature Sense Resistor Configuration Pins Internal Regulator Outputs IC Junction Temperature Derating EEPROM Retention at Temperature Configuring Open-Drain Pins PMBus Communication and Command Processing Status and Fault Log Management LTpowerPlay – An Interactive Digital Power GUI Interfacing to the DC1613 Design Example PMBus COMMAND DETAILS Addressing and Write Protect PAGE PAGE_PLUS_WRITE PAGE_PLUS_READ WRITE_PROTECT MFR_ADDRESS MFR_RAIL_ADDRESS General Device Configuration PMBUS_REVISION CAPABILITY On, Off and Margin Control ON_OFF_CONFIG MFR_CONFIG_ALL_LTC3882 OPERATION MFR_RESET PWM Configuration FREQUENCY_SWITCH MFR_PWM_CONFIG_LTC3882 MFR_CHAN_CONFIG_LTC3882 MFR_PWM_MODE_LTC3882 Input Voltage and Limits VIN_ON VIN_OFF VIN_OV_FAULT_LIMIT VIN_UV_WARN_LIMIT Output Voltage and Limits VOUT_MODE VOUT_COMMAND MFR_VOUT_MAX VOUT_MAX MFR_VOUT_AVP VOUT_MARGIN_HIGH VOUT_MARGIN_LOW VOUT_OV_FAULT_LIMIT VOUT_OV_WARN_LIMIT VOUT_UV_WARN_LIMIT VOUT_UV_FAULT_LIMIT Output Current and Limits IOUT_CAL_GAIN MFR_IOUT_CAL_GAIN_TC IOUT_OC_FAULT_LIMIT IOUT_OC_WARN_LIMIT Output Timing, Delays, and Ramping MFR_RESTART_DELAY TON_DELAY TON_RISE TON_MAX_FAULT_LIMIT VOUT_TRANSITION_RATE TOFF_DELAY TOFF_FALL TOFF_MAX_WARN_LIMIT External Temperature and Limits MFR_TEMP_1_GAIN MFR_TEMP_1_OFFSET OT_FAULT_LIMIT OT_WARN_LIMIT Status Reporting STATUS_BYTE UT_FAULT_LIMIT STATUS_WORD STATUS_VOUT STATUS_IOUT STATUS_INPUT STATUS_TEMPERATURE STATUS_CML STATUS_MFR_SPECIFIC MFR_PADS_LTC3882 MFR_COMMON MFR_INFO CLEAR_FAULTS Telemetry READ_VIN MFR_VIN_PEAK READ_VOUT MFR_VOUT_PEAK READ_IOUT MFR_IOUT_PEAK READ_POUT READ_TEMPERATURE_1 MFR_TEMPERATURE_1_PEAK READ_TEMPERATURE_2 MFR_TEMPERATURE_2_PEAK READ_DUTY_CYCLE READ_FREQUENCY MFR_CLEAR_PEAKS Fault Response and Communication VIN_OV_FAULT_RESPONSE VOUT_OV_FAULT_RESPONSE VOUT_UV_FAULT_RESPONSE IOUT_OC_FAULT_RESPONSE OT_FAULT_RESPONSE UT_FAULT_RESPONSE MFR_OT_FAULT_RESPONSE TON_MAX_FAULT_RESPONSE MFR_RETRY_DELAY SMBALERT_MASK MFR_GPIO_PROPAGATE_LTC3882 MFR_GPIO_RESPONSE MFR_FAULT_LOG Fault Log Operation MFR_FAULT_LOG_CLEAR EEPROM User Access STORE_USER_ALL RESTORE_USER_ALL MFR_COMPARE_USER_ALL MFR_FAULT_LOG_STORE MFR_EE_xxxx USER_DATA_0x Unit Identification MFR_ID MFR_MODEL MFR_SERIAL MFR_SPECIAL_ID Typical Applications Package Description Revision History Typical Application Related Parts