Datasheet LTC3888-1 (Analog Devices) - 10
| Hersteller | Analog Devices |
| Beschreibung | Dual Loop 8-Phase Step-Down DC/DC Controller with Digital Power System Management |
| Seiten / Seite | 110 / 10 — TYPICAL PERFORMANCE CHARACTERISTICS. Efficiency and Power Loss vs. … |
| Dateiformat / Größe | PDF / 2.5 Mb |
| Dokumentensprache | Englisch |
TYPICAL PERFORMANCE CHARACTERISTICS. Efficiency and Power Loss vs. Efficiency vs Load Current. Input Voltage
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LTC3888-1
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency and Power Loss vs Efficiency and Power Loss vs Efficiency vs Load Current Efficiency vs Load Current Efficiency vs Load Current Efficiency vs Load Current Input Voltage Input Voltage (8-Phase Using LTC7051) (8–Phase Using LTC7051) (1-Phase Using TDA21470) (4-Phase Using TDA21470) (4–Phase Using TDA21470)
100 100 100 10 VIN = 12V VIN = 12V VOUT = 1.0V Efficiency at 500kHz at 500kHz Load = 80A 95 Power Loss 95 at 500kHz 97 9 POWER LOSS (W) 90 90 85 85 94 8 EFFICIENCY (%) 80 EFFICIENCY (%) EFFICIENCY (%) 80 0.6V 91 7 0.8V 1.8V 75 1.0V 75 2.5V 1.8V 70 70 88 6 0 80 160 240 320 400 0 10 20 30 40 50 6 8 10 12 14 16 LOAD CURRENT (A) LOAD CURRENT (A) VIN (V) 3888-1 G01 3888-1 G03 3888-1 G02
Typical Output V T oltage ypical Output Voltage Typical Output V T oltage Distrubtion ypical Output Voltage Regulated Output vs T Regulated Output vs Temperature emperature Distribution at 25°C Without Ser Distribution Without Servo vo at 25°C with Servo Distribution With Servo
1.0050 2500 2500 VOUT_COMMAND = 1.0V 1047 UNITS 1047 UNITS VOUT_SCALE_LOOP = 3.5 VOUT_COMMAND = 1.0V VOUT_COMMAND = 1.0V SERVO MODE DISABLED SERVO MODE DISABLED 2000 SERVO MODE ENGAGED 2000 1.0025 1500 1500 1.0000 VOUT (V) 1000 1000 0.9975 NUMBER OF CHANNELS NUMBER OF CHANNELS 500 500 0.9950 0 0 –40 –20 0 20 40 60 80 100 120 –10 –8 –6 –4 –2 0 2 4 6 8 10 –2 –1.6 –1.2 –0.8 –0.4 0.0 0.4 0.8 1.2 1.6 2 TEMPERATURE (°C) VOUT ERROR (mV) VOUT ERROR (mV) 3888-1 G04 3888-1 G05 3888-1 G06
4-Phase Load Step Response Emulated 4-Phase Load Step 4-Phase Single Cycle Response (Using TDA21470) Response (Using TDA21470) (Using TDA21470 with COUT = 4mF)
V V OUT VOUT OUT 50mV/DIV 50mV/DIV 20mV/DIV ITH ITH 200mV/DIV 200mV/DIV PWMO I(LO) I(LO) 2V/DIV 10AV/DIV 10A/DIV IOUT IOUT IOUT 40A/DIV 40A/DIV 40A/DIV 50μs/DIV 3888-1 G07 50μs/DIV 3888-1 G08 2μs/DIV 3888-1 G09 VIN = 12V VIN = 12V VIN = 12V VOUT = 1.0V VOUT = 1.0V VOUT = 1.0V 10A TO 50A STEP MFR_LOAD_EMULATION = 10A/PHASE SYNC = 500kHz L = 215nH Rev. 0 10 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Test Circuit Operation Overview About This Document Major Product Features Main Control Loop Power-Up and Initialization Testing Integrity of Output Voltage Sense Analog Output Voltage Control PMBus Output Voltage Control Soft-Start Time-Based Output Sequencing Output Ramping Control Voltage-Based Output Sequencing Output Disable Minimum Output Disable Times Output Short Cycle Switching Frequency and Phase PolyPhase Load Sharing Voltage Control Loop Compensation Load Step Emulation Input Supply Monitoring Output Voltage Sensing and Monitoring Output Current Sensing and Monitoring Temperature Sense Resistor Configuration Pins Internal EEPROM with CRC Fault Detection Input Supply Faults Hardwired PWM Response to Power Stage Faults Hardwired PWM Response to Power Stage UV Hardwired PWM Response to VOUT Faults Power Good Indication Hardwired PWM Response to IOUT Faults Hardwired PWM Response to Internal Temperature Faults External Temperature Faults Timing Faults External Faults Higher-Level Fault Handling Status Registers and ALERT Masking FAULT Pin I/O Fault Log Operation Fault Log Details 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 Power Stage Selection and Interface Using The VDR Monitor Unused TSNS Inputs PWM Frequency and Inductor Selection CIN Selection COUT Selection Programmable Loop Compensation PCB Layout Considerations Output Voltage Sensing Classical Analog Output Voltage Control PMBus Output Voltage Control Using Output Voltage Servo Soft-Start and Stop Time-Based Output Sequencing and Ramping Voltage-Based Output Sequencing PWM Frequency Synchronization PolyPhase Operation and Load Sharing 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 MFR_CONFIG_ALL On, Off and Margin Control ON_OFF_CONFIG OPERATION MFR_RESET PWM Configuration FREQUENCY_SWITCH MFR_CHAN_CONFIG MFR_PWM_CONFIG_LTC3888-1 MFR_PWM_MODE_LTC3888-1 MFR_PWM_COMP Input Voltage and Limits VIN_ON VIN_OFF VIN_OV_FAULT_LIMIT VIN_UV_WARN_LIMIT Output Voltage and Limits VOUT_MODE VOUT_COMMAND VOUT_MAX MFR_VOUT_MAX VOUT_MARGIN_HIGH VOUT_MARGIN_LOW VOUT_SCALE_LOOP VOUT_OV_FAULT_LIMIT VOUT_OV_WARN_LIMIT VOUT_UV_WARN_LIMIT VOUT_UV_FAULT_LIMIT Output Current and Limits IOUT_CAL_GAIN MFR_LOAD_EMULATION MFR_LOAD_EMULATION IOUT_OC_FAULT_LIMIT IOUT_OC_WARN_LIMIT Output Timing, Delays, and Ramping MFR_RESTART_DELAY TON_DELAY TON_MAX_FAULT_LIMIT VOUT_TRANSITION_RATE TOFF_DELAY 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 STATUS_WORD STATUS_VOUT STATUS_IOUT STATUS_INPUT STATUS_TEMPERATURE STATUS_CML STATUS_MFR_SPECIFIC MFR_PADS_LTC3888-1 MFR_COMMON MFR_INFO CLEAR_FAULTS Telemetry READ_VIN MFR_VIN_PEAK READ_VOUT MFR_VOUT_PEAK READ_IOUT MFR_IOUT_PEAK MFR_TOTAL_IOUT MFR_READ_ALL_IOUT READ_TEMPERATURE_1 MFR_TEMPERATURE_1_PEAK READ_TEMPERATURE_2 MFR_TEMPERATURE_2_PEAK 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 MFR_OT_FAULT_RESPONSE TON_MAX_FAULT_RESPONSE MFR_RETRY_DELAY SMBALERT_MASK MFR_FAULT_PROPAGATE MFR_FAULT_RESPONSE MFR_FAULT_LOG 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 IC_DEVICE_ID MFR_SPECIAL_ID Package Description Typical Applications Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency and Power Loss vs Efficiency and Power Loss vs Efficiency vs Load Current Efficiency vs Load Current Efficiency vs Load Current Efficiency vs Load Current Input Voltage Input Voltage (8-Phase Using LTC7051) (8–Phase Using LTC7051) (1-Phase Using TDA21470) (4-Phase Using TDA21470) (4–Phase Using TDA21470)
100 100 100 10 VIN = 12V VIN = 12V VOUT = 1.0V Efficiency at 500kHz at 500kHz Load = 80A 95 Power Loss 95 at 500kHz 97 9 POWER LOSS (W) 90 90 85 85 94 8 EFFICIENCY (%) 80 EFFICIENCY (%) EFFICIENCY (%) 80 0.6V 91 7 0.8V 1.8V 75 1.0V 75 2.5V 1.8V 70 70 88 6 0 80 160 240 320 400 0 10 20 30 40 50 6 8 10 12 14 16 LOAD CURRENT (A) LOAD CURRENT (A) VIN (V) 3888-1 G01 3888-1 G03 3888-1 G02
Typical Output V T oltage ypical Output Voltage Typical Output V T oltage Distrubtion ypical Output Voltage Regulated Output vs T Regulated Output vs Temperature emperature Distribution at 25°C Without Ser Distribution Without Servo vo at 25°C with Servo Distribution With Servo
1.0050 2500 2500 VOUT_COMMAND = 1.0V 1047 UNITS 1047 UNITS VOUT_SCALE_LOOP = 3.5 VOUT_COMMAND = 1.0V VOUT_COMMAND = 1.0V SERVO MODE DISABLED SERVO MODE DISABLED 2000 SERVO MODE ENGAGED 2000 1.0025 1500 1500 1.0000 VOUT (V) 1000 1000 0.9975 NUMBER OF CHANNELS NUMBER OF CHANNELS 500 500 0.9950 0 0 –40 –20 0 20 40 60 80 100 120 –10 –8 –6 –4 –2 0 2 4 6 8 10 –2 –1.6 –1.2 –0.8 –0.4 0.0 0.4 0.8 1.2 1.6 2 TEMPERATURE (°C) VOUT ERROR (mV) VOUT ERROR (mV) 3888-1 G04 3888-1 G05 3888-1 G06
4-Phase Load Step Response Emulated 4-Phase Load Step 4-Phase Single Cycle Response (Using TDA21470) Response (Using TDA21470) (Using TDA21470 with COUT = 4mF)
V V OUT VOUT OUT 50mV/DIV 50mV/DIV 20mV/DIV ITH ITH 200mV/DIV 200mV/DIV PWMO I(LO) I(LO) 2V/DIV 10AV/DIV 10A/DIV IOUT IOUT IOUT 40A/DIV 40A/DIV 40A/DIV 50μs/DIV 3888-1 G07 50μs/DIV 3888-1 G08 2μs/DIV 3888-1 G09 VIN = 12V VIN = 12V VIN = 12V VOUT = 1.0V VOUT = 1.0V VOUT = 1.0V 10A TO 50A STEP MFR_LOAD_EMULATION = 10A/PHASE SYNC = 500kHz L = 215nH Rev. 0 10 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Test Circuit Operation Overview About This Document Major Product Features Main Control Loop Power-Up and Initialization Testing Integrity of Output Voltage Sense Analog Output Voltage Control PMBus Output Voltage Control Soft-Start Time-Based Output Sequencing Output Ramping Control Voltage-Based Output Sequencing Output Disable Minimum Output Disable Times Output Short Cycle Switching Frequency and Phase PolyPhase Load Sharing Voltage Control Loop Compensation Load Step Emulation Input Supply Monitoring Output Voltage Sensing and Monitoring Output Current Sensing and Monitoring Temperature Sense Resistor Configuration Pins Internal EEPROM with CRC Fault Detection Input Supply Faults Hardwired PWM Response to Power Stage Faults Hardwired PWM Response to Power Stage UV Hardwired PWM Response to VOUT Faults Power Good Indication Hardwired PWM Response to IOUT Faults Hardwired PWM Response to Internal Temperature Faults External Temperature Faults Timing Faults External Faults Higher-Level Fault Handling Status Registers and ALERT Masking FAULT Pin I/O Fault Log Operation Fault Log Details 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 Power Stage Selection and Interface Using The VDR Monitor Unused TSNS Inputs PWM Frequency and Inductor Selection CIN Selection COUT Selection Programmable Loop Compensation PCB Layout Considerations Output Voltage Sensing Classical Analog Output Voltage Control PMBus Output Voltage Control Using Output Voltage Servo Soft-Start and Stop Time-Based Output Sequencing and Ramping Voltage-Based Output Sequencing PWM Frequency Synchronization PolyPhase Operation and Load Sharing 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 MFR_CONFIG_ALL On, Off and Margin Control ON_OFF_CONFIG OPERATION MFR_RESET PWM Configuration FREQUENCY_SWITCH MFR_CHAN_CONFIG MFR_PWM_CONFIG_LTC3888-1 MFR_PWM_MODE_LTC3888-1 MFR_PWM_COMP Input Voltage and Limits VIN_ON VIN_OFF VIN_OV_FAULT_LIMIT VIN_UV_WARN_LIMIT Output Voltage and Limits VOUT_MODE VOUT_COMMAND VOUT_MAX MFR_VOUT_MAX VOUT_MARGIN_HIGH VOUT_MARGIN_LOW VOUT_SCALE_LOOP VOUT_OV_FAULT_LIMIT VOUT_OV_WARN_LIMIT VOUT_UV_WARN_LIMIT VOUT_UV_FAULT_LIMIT Output Current and Limits IOUT_CAL_GAIN MFR_LOAD_EMULATION MFR_LOAD_EMULATION IOUT_OC_FAULT_LIMIT IOUT_OC_WARN_LIMIT Output Timing, Delays, and Ramping MFR_RESTART_DELAY TON_DELAY TON_MAX_FAULT_LIMIT VOUT_TRANSITION_RATE TOFF_DELAY 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 STATUS_WORD STATUS_VOUT STATUS_IOUT STATUS_INPUT STATUS_TEMPERATURE STATUS_CML STATUS_MFR_SPECIFIC MFR_PADS_LTC3888-1 MFR_COMMON MFR_INFO CLEAR_FAULTS Telemetry READ_VIN MFR_VIN_PEAK READ_VOUT MFR_VOUT_PEAK READ_IOUT MFR_IOUT_PEAK MFR_TOTAL_IOUT MFR_READ_ALL_IOUT READ_TEMPERATURE_1 MFR_TEMPERATURE_1_PEAK READ_TEMPERATURE_2 MFR_TEMPERATURE_2_PEAK 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 MFR_OT_FAULT_RESPONSE TON_MAX_FAULT_RESPONSE MFR_RETRY_DELAY SMBALERT_MASK MFR_FAULT_PROPAGATE MFR_FAULT_RESPONSE MFR_FAULT_LOG 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 IC_DEVICE_ID MFR_SPECIAL_ID Package Description Typical Applications Related Parts