Datasheet LTM4700 (Analog Devices) - 8

link to page 90 link to page 12 link to page 12 LTM4700
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified internal operating temperature range (Note 2). Specified as each individual output channel (Note 4). TA = 25°C, VIN = 12V, RUNn = 3.3V, 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 Channels 0 and 1 Output Current (READ_IOUTn ), Duty Cycle (READ_DUTY_CYCLEn ), and Computed Input Current (MFR_READ_IIN
n
) Readback
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) 50 A Digitizable Range Utilizing MFR_PWM_MODE[7] = 1, Using ~IOUT = 50A, Page 90 IO-RB-ACC Output Current, Readback Accuracy READ_IOUTn, Channels 0 and 1, 0 ≤ IOUTn ≤ 50A, Forced-Continuous Mode, MFR_PWM_MODEn[1:0] = 1b (Note 19) 25°C to 125°C Within 1.5A of Reading –45°C to 125°C l Within 2.5A of Reading IO-RB(50A) Full Load Output Current Readback IOUTn = 50A (Note 12). See Histograms in Typical 50 A Performance Characteristics tCONVERT-IO-RB Output Current Readback Update MFR_ADC_CONTROL = 0x00 (Notes 9, 15) 90 ms Rate MFR_ADC_CONTROL = 0x06 (CH0 IOUT) or 0x01 (CH1 IOUT) 8 ms (Notes 9, 15) See MFR_ADC_CONTROL SECTION
Input Current Readback
N Resolution (Note 10) 10 Bits V + – IINSTP LSB Step Size Full-Scale Range = Gain = 8, 0V ≤ |VIIN – VIIN | ≤ 5mV 15.26 µV 16mV Gain = 4, 0V ≤ |V + – IIN – VIIN | ≤ 20mV 30.52 µV LSB Step Size Full-Scale Range = Gain = 2, 0V ≤ |V + – IIN – VIIN | ≤ 50mV 61 µV 32mV LSB Step Size Full-Scale Range = 64mV I + – IN_TUE Total Unadjusted Error Gain = 8, 2.5mV ≤ |VIIN – VIIN | VIN = 8V (Note 15) l ±2 % Gain = 4, 4mV ≤ |V + – IIN – VIIN | VIN = 8V (Note 15) l ±1.3 % Gain = 2, 6mV ≤ |V + – IIN – VIIN | VIN = 8V (Note 15) l ±1.2 % VOS Zero-Code Offset Voltage ±50 µV tCONVERT Update Rate (Notes 9,15) See MFR_ADC_CONTROL SECTION for Faster 90 ms Update Rates
Supply Current Readback
N Resolution (Note 10) 10 Bits VICHIPSTP LSB Step Size Full-Scale Range = Onboard 1Ω Resistor 244 µV 256mV I + CHIPTUE Total Unadjusted Error |VIIN – VIN| ≤ 150mV l ±3 % tCONVERT Update Rate (Notes 9,15) See MFR_ADC_CONTROL SECTION for Faster 90 ms Update Rates
Temperature Readback (T0, T1)
TRES-RB Temperature Readback Resolution Channel 0, Channel 1, and Controller (Note 15) 0.25 °C T0_TUE External Temperature Total Supporting Only ∆VBE Sensing Unadjusted Readback Error 3 °C °C T1_TUE Internal TSNS TUE VRUN0,1 = 0.0, fSYNC = 0kHz (Note 15) ±1 °C tCONVERT Update Rate (Note 9) 90 ms MFR_ADC_CONTROL = 0x04 or 0x0C (Notes 9, 15) 8 ms Rev 0 8 For more information www.analog.com 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 PMBus Command Summary Applications Information Applications Information-Derating Curves Typical Applications PMBus Command Details Package Description Typical Applications Package Photograph Related Parts 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 and Build-in 5V Bias Converter Output Current Sensing and Sub Milliohm DCR Current Sensing Input Current Sensing PolyPhase Load Sharing External/Internal Temperature Sense RCONFIG (Resistor Configuration) Pins 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 Figures 7 to 24 PMBus Protocols PMBus Command Summary PMBus Commands Applications Information VIN to VOUT Step-Down Ratios Input Capacitors Output Capacitors Light Load Current Operation Switching Frequency and Phase 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 LTM4700 In System LTpowerPlay: An Interactive GUI for Digital Power PMBus Communication and Command Processing Thermal Considerations and Output Current Derating 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 External 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 Fault Responses Output Current Fault Responses IC Temperature Fault Responses External Temperature Fault Sharing Fault Sharing Propagation Fault Sharing Response Scratchpad Identification Fault Warning and Status Telemetry NVM Memory Commands Store/Restore Fault Logging Block Memory Write/Read Package Description Typical Applications Package Photograph Related Parts