Datasheet LTM4675 (Analog Devices) - 4

LTM4675
e lecTrical 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 = 5V, FREQUENCY_SWITCH = 500kHz 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
VIN Input DC Voltage Test Circuit 1 l 5.75 17 V Test Circuit 2; VIN_OFF < VIN_ON = 4.25V l 4.5 5.75 V V + – OUTn Range of Output Voltage VOUT0 Differentially Sensed on VOSNS0 /VOSNS0 Pin-Pair; l 0.5 5.5 V Regulation VOUT1 Differentially Sensed on VOSNS1/SGND Pin-Pair; l 0.5 5.5 V Commanded by Serial Bus or with Resistors Present at Start-Up on VOUTnCFG and/or VTRIMnCFG VOUTn(DC) Output Voltage, Total (Note 5 Variation with Line and VOUTn Low Range (MFR_PWM_MODEn[1] = 1b), Load FREQUENCY_SWITCH = 425kHz ) Digital Servo Engaged (MFR_PWM_MODEn[6] = 1b) l 0.995 1.000 1.005 V Digital Servo Disengaged (MFR_PWM_MODEn[6] = 0b) 0.985 1.000 1.015 V
Input Specifications
IINRUSH(VIN) Input Inrush Current at Test Circuit 1, VOUTn =1V, VIN = 12V; No Load Besides Capacitors; 400 mA Start-Up TON_RISEn = 3ms IQ(SVIN) Input Supply Bias Current Forced Continuous Mode, MFR_PWM_MODEn[0] = 1b RUNn = 5V, RUN1-n = 0V 40 mA Shutdown, RUN0 = RUN1 = 0V 20 mA IS(VINn,PSM) Input Supply Current in Pulse-Skipping Mode, MFR_PWM_MODEn[0] = 0b, 20 mA Pulse-Skipping Mode IOUTn = 100mA Operation IS(VINn,FCM) Input Supply Current in Forced Continuous Mode, MFR_PWM_MODEn[0] = 1b Forced-Continuous Mode IOUTn = 100mA 40 mA Operation IOUTn = 9A 927 mA IS(VINn,SHUTDOWN) Input Supply Current in Shutdown, RUNn = 0V 50 µA Shutdown
Output Specifications
IOUTn Output Continuous (Note 6) 0 9 A Current Range ∆VOUTn(LINE) Line Regulation Accuracy Digital Servo Engaged (MFR_PWM_MODEn[6] = 1b) 0.03 % V Digital Servo Disengaged (MFR_PWM_MODEn[6] = 0b) l 0.03 ±0.2 %/V OUTn SVIN and VINn Electrically Shorted Together and INTVCC Open Circuit; IOUTn = 0A, 5.75V ≤ VIN ≤ 17V, VOUT Low Range (MFR_PWM_MODEn[1] = 1b) FREQUENCY_SWITCH = 425kHz (Referenced to 12VIN) (Note 5) ∆VOUTn(LOAD) Load Regulation Digital Servo Engaged (MFR_PWM_MODEn[6] = 1b) 0.03 % Accuracy Digital Servo Disengaged (MFR_PWM_MODEn[6] = 0b) l 0.2 0.5 % VOUTn 0A ≤ IOUTn ≤ 9A, VOUT Low Range, (MFR_PWM_MODEn[1] = 1b) FREQUENCY_SWITCH = 425kHz (Note 5) VOUTn(AC) Output Voltage Ripple 10 mVP-P fS (Each Channel) VOUTn Ripple Frequency FREQUENCY_SWITCH Set to 500kHz (0xFBE8) l 462.5 500 537.5 kHz ∆VOUTn(START) Turn-On Overshoot TON_RISEn = 3ms (Note 12) 8 mV tSTART Turn-On Start-Up Time Time from VIN Toggling from 0V to 12V to Rising Edge of GPIOn. l 35 40 ms TON_DELAYn = 0ms, TON_RISEn = 3ms, MFR_GPIO_PROPAGATEn = 0x0100, MFR_GPIO_RESPONSEn = 0x0000 4675fb 4 For more information www.linear.com/LTM4675 Document Outline Features Applications Typical Application Description 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 Configurability and Readback Data Time-Averaged and Peak Readback Data Power Module Overview EEPROM Serial Interface Device Addressing Fault Detection and Handling Responses to VOUT and IOUT Faults Responses to Timing Faults Responses to SVIN OV Faults Responses to OT/UT Faults Responses to External Faults Fault Logging Bus Timeout Protection PMBus Command Summary PMBus Commands VIN to VOUT Step-Down Ratios Input Capacitors Output Capacitors Light Load Current Operation Switching Frequency and Phase 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 RCONFIG Pin-Straps (External Resistor Configuration Pins) Voltage Selection Connecting the USB to the I2C/SMBus/PMBus Controller to the LTM4675 In System LTpowerPlay: An Interactive GUI for Digital Power System Management PMBus Communication and Command Processing Thermal Considerations and Output Current Derating EMI Performance Safety Considerations Layout Checklist/Example Typical Applications Appendix A Similarity Between PMBus, SMBus and I2C 2-Wire Interface Appendix B PMBus Serial Digital Interface Appendix C: PMBus Command Details Addressing and Write Protect General Configuration Registers On/Off/Margin PWM Config Voltage Current Temperature Timing Fault Response Fault Sharing Scratchpad Identification Fault Warning and Status Telemetry NVM (EEPROM) Memory Commands Package Description Package Photograph Package Description Revision History Typical Application Design Resources Related Parts