Datasheet LTM4678 (Analog Devices) - 7

link to page 114 link to page 89 LTM4678
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified internal operating temperature range (Note 2). n is specified as each individual output channel (Note 4). TA = 25°C, VIN = 12V, RUNn = 3.3V, EXTVCC = 0, FREQUENCY_SWITCH = 350kHz and VOUTn commanded to 1.000V unless otherwise noted. Configured with factory-default EEPROM settings and per Test Circuit 1, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VUV-ACC Output UV Comparator Threshold (See Note 14) Accuracy 1V ≤ V + – VOSNSn – VVOSNSn ≤ 2.7V, MFR_PWM_MODE[1] = 1b l ±1.5 % 0.5V ≤ V + – VOSNSn – VVOSNSn ≤ 1V, MFR_PWM_MODE[1] = 1b l ±40 mV 2.0V ≤ V + – VOSNSn – VVOSNSn ≤ 3.6V, MFR_PWM_MODE[1] = 0b l ±1.5 % tPROP-OV Output OV Comparator Response Overdrive to 10% Above Programmed Threshold 100 µs Times tPROP-UV Output UV Comparator Response Under Drive to 10% Below Programmed Threshold 100 µs Times
Analog OV/UV SVIN Input Voltage Supervisor Comparators (Threshold Detectors for VIN_ON and VIN_OFF)
NSVIN-OV/UV-COMP SVIN OV/UV Comparator Threshold- (Note 15) 9 Bits Programming Resolution SVIN-OU-RANGE SVIN OV/UV Comparator Threshold- l 4.5 16 V Programming Range SVIN-OU-STP SVIN OV/UV Comparator Threshold- (Note 15) 76 mV Programming LSB Step Size SVIN-OU-ACC SVIN OV/UV Comparator Threshold 4.5V ≤ SVIN ≤ 16V l ±350 mV Accuracy tPROP-SVIN-HIGH-VIN SVIN OV/UV Comparator Response Test Circuit 1, and: Time, High VIN Operating VIN_ON = 9V; SVIN Driven from 8.775V to 9.225V l 100 µs Configuration VIN_OFF = 9V; SVIN Driven from 9.225V to 8.775V l 100 µs tPROP-SVIN-LOW-VIN SVIN OV/UV Comparator Response Test Circuit 2, and: Time, Low VIN Operating VIN_ON = 4.5V; SVIN Driven from 4.225V to 4.725V l 100 µs Configuration VIN_OFF = 4.5V; SVIN Driven from 4.725V to 4.225V l 100 µs
Channels 0 and 1 Output Voltage Readback (READ_VOUTn )
NVO-RB Output Voltage Readback (Note 15) 16 Bits Resolution and LSB Step Size 244 µV VO-F/S Output Voltage Full-Scale VRUNn = 0V (Note 15) 8 V Digitizable Range V + – O-RB-ACC Output Voltage Readback Accuracy Channel 0, 1: 1V ≤ VVOSNS – VVOSNS ≤ 3.6V l Within ±0.5% of Reading Channel 0, 1: 0.5V ≤ V + – VOSNS – VVOSNS < 1V l Within ±5mV of Reading tCONVERT-VO-RB Output Voltage Readback Update MFR_ADC_CONTROL = 0x00 (Notes 9, 15) 90 ms Rate MFR_ADC_CONTROL = 0x01 through 0x0C (Notes 9, 15) 8 ms MFR_ADC_CONTROL Section ms
Input Voltage (SVIN) Readback (READ_VIN)
NSVIN-RB Input Voltage Readback Resolution (Notes 10, 15) Limited to Abs Max = 18V for 10 Bits and LSB Step Size LTM4678 Module 15.625 mV SVIN-F/S Input Voltage Full-Scale Digitizable (Notes 11, 15) 43 V Range SVIN-RB-ACC Input Voltage Readback Accuracy READ_VIN, 4.5V ≤ SVIN ≤ 16V l Within ±2% of Reading tCONVERT-SVIN-RB Input Voltage Readback Update MFR_ADC_CONTROL = 0x00 (Notes 9, 15) 90 ms Rate MFR_ADC_CONTROL = 0x01 (Notes 9, 15) 8 ms
Channels 0 and 1 Output Current (READ_IOUTn )
NIO-RB Output Current Readback (Notes 10, 12) 10 Bits Resolution and LSB Step Size 34.1 mA IO-F/S Output Current Full-Scale (Note 12) 40 A Digitizable Range Utilizing MFR_PWM_MODE[7] = 1, Using IOUT_OC_FAULT_ LIMIT = 34A, Page 89 Rev. A For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Table of Contents Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Functional Diagram Test Circuits Operation Power Module Introduction Power Module Overview, Major Features EEPROM with ECC Power-Up and Initialization Soft-Start Time-Based Sequencing Voltage-Based Sequencing Shutdown Light-Load Current Operation Switching Frequency and Phase PWM Loop Compensation Output Voltage Sensing INTVCC/EXTVCC Power Output Current Sensing and Sub Milliohm DCR Current Sensing Input Current Sensing PolyPhase Load Sharing External/Internal Temperature Sense RCONFIG (Resistor Configuration) Pins VOUTn _CFG Pin Strapping Look-Up Table for the LTM4678’s Output Voltage, Coarse Setting (Not Applicable if MFR_CONFIG_ALL[6] = 1b) VTRIMn_CFG Pin Strapping Look-Up Table for the LTM4678’s Output Voltage, Fine Adjustment Setting (Not Applicable if MFR_CONFIG_ALL[6] = 1b) FSWPH_CFG Pin Strapping Look-Up Table to Set the LTM4678’s Switching Frequency and Channel Phase-Interleaving Angle (Not Applicable if MFR_CONFIG_ALL[6] = 1b) ASEL Pin Strapping Look-Up Table to Set the LTM4678’s Slave Address (Applicable Regardless of MFR_CONFIG_ALL[6] Setting) LTM4678 MFR_ADDRESS Command Examples Expressed in 7- and 8-Bit Addressing Fault Detection and Handling Status Registers and ALERT Masking Mapping Faults to FAULT Pins Power Good Pins CRC Protection Serial Interface Communication Protection Device Addressing Responses to VOUT and IIN/IOUT Faults Output Overvoltage Fault Response Output Undervoltage Response Peak Output Overcurrent Fault Response Responses to Timing Faults Responses to VIN OV Faults Responses to OT/UT Faults Internal Overtemperature Fault Response External Overtemperature and Undertemperature Fault Response Responses to Input Overcurrent and Output Undercurrent Faults Responses to External Faults Fault Logging Bus Timeout Protection Similarity Between PMBus, SMBus and I2C 2-Wire Interface PMBus Serial Digital Interface Abbreviations of Supported Data Formats Figure 7 to Figure 24 PMBus Protocols PMBus Command Summary PMBus Commands PMBus Commands Summary (Note: The Data Format Abbreviations are Detailed in Table 8) Data Format Abbreviations Applications Information VIN to VOUT Step-Down Ratios Input Capacitors Output Capacitors Light Load Current Operation Switching Frequency and Phase Recommended Switching Frequency for Various VIN-to-VOUT Step-Down Scenarios Output Current Limit Programming Minimum On-Time Considerations Variable Delay Time, Soft-Start and Output Voltage Ramping Digital Servo Mode Soft Off (Sequenced Off) Undervoltage Lockout Fault Detection and Handling Open-Drain Pins Phase-Locked Loop and Frequency Synchronization Input Current Sense Amplifier Programmable Loop Compensation Checking Transient Response PolyPhase Configuration Connecting The USB to I2C/SMBus/PMBus Controller to the LTM4678 In System LTpowerPlay: An Interactive GUI for Digital Power PMBus Communication and Command Processing Thermal Considerations and Output Current Derating Table 10 thru Table 11: Output Current Derating 0.9V Output 1.8V Output Channel Output Voltage vs Component Selection, 0A to 12.5A/μs Load Step Output Capacitor-GRM32ER60G337ME05L, 330μF, 4V, X5R, Murata Low VOUT Range for VOUT ≤ 2.5V High VOUT Range for 2.5V ≤ VOUT ILIMIT Range = High Channel Output Voltage vs Component Selection, 0A to 12.5A/μs Load Step Low VOUT Range for VOUT ≤ 2.5V High VOUT Range for 2.5V ≤ VOUT ILIMIT Range = High Dual Phase Single Output – Ceramic and Poscap Output Capacitors Applications Information-Derating Curves EMI Performance Safety Considerations Layout Checklist/Example Typical Applications PMBus Command Details Addressing and Write Protect General Configuration Commands On/Off/Margin PWM Configuration Voltage Input Voltage and Limits Output Voltage and Limits Output Current and Limits Input Current and Limits Temperature Power Stage DCR Temperature Calibration Timing Timing—On Sequence/Ramp Timing—Off Sequence/Ramp Precondition for Restart Fault Response Fault Responses All Faults Fault Responses Input Voltage Fault Responses Output Voltage VOUT_OV_FAULT_RESPONSE Data Byte Contents VOUT_UV_FAULT_RESPONSE Data Byte Contents Fault Responses Output Current OUT_OC_FAULT_RESPONSE Data Byte Contents Fault Responses IC Temperature Data Byte Contents MFR_OT_FAULT_RESPONSE Fault Responses External Temperature Fault Sharing Fault Sharing Propagation FAULTn Propagate Fault Configuration Fault Sharing Response Scratchpad Identification Fault Warning and Status Telemetry NVM Memory Commands Store/Restore Fault Logging Fault Logging Explanation of Position_Fault Values Block Memory Write/Read Package Description LTM4678 BGA Pinout Revision History Package Photograph Design Resources Related Parts