Datasheet LTM4686, LTM4686-1 (Analog Devices) - 4

LTM4686/LTM4686-1
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 = 5V, FREQUENCY_SWITCH = 500kHz, VOUT_COMMANDn = 1V and VOUT_UV_FAULT_RESPONSEn = TON_MAX_FAULT_RESPONSEn = 0x00 unless otherwise noted. All other command codes configured per factory-default EEPROM settings unless otherwise noted. Tested per Circuit 1, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Input DC Voltage Test Circuit 1; 5.75V ≤ SVIN ≤ 17V; INTVCC Open; VIN_OFF < VIN_ON = 5.5V l 5.75 17 V Test Circuit 2; 4.5V ≤ SVIN ≤ 5.75V; INTVCC = SVIN; VIN_OFF < VIN_ON = 4.25V l 4.5 5.75 V Test Circuit 3; 4.5V ≤ SVIN ≤ 5.75V; INTVCC = SVIN; VIN_OFF < VIN_ON = 4.25V l 2.375 17 V V + – OUTn Range of Output VOUT0 Differentially Sensed on VOSNS0 /VOSNS0 Pin-Pair; l 0.5 3.6 V Voltage Regulation VOUT1 Differentially Sensed on VOSNS1/SGND Pin-Pair; l 0.5 3.6 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 Forced Continuous Mode, MFR_PWM_MODEn[0] = 1b Current RUNn = 5V, RUN1-n = 0V 40 mA Shutdown, RUN0 = RUN1 = 0V 20 mA IS(VINn,PSM) Input Supply Current Pulse-Skipping Mode, MFR_PWM_MODEn[0] = 0b, 20 mA in Pulse-Skipping IOUTn = 100mA Mode Operation IS(VINn,FCM) Input Supply Current Forced Continuous Mode, MFR_PWM_MODEn[0] = 1b in Forced-Continuous IOUTn = 100mA 40 mA Mode Operation IOUTn = 10A 1.06 A IS(VINn,SHUTDOWN) Input Supply Current Shutdown, RUNn = 0V 50 µA in Shutdown
Output Specifications
IOUTn Output Continuous (Note 6) 0 10 A Current Range ∆VOUTn(LINE) Line Regulation Digital Servo Engaged (MFR_PWM_MODEn[6] = 1b) 0.03 % V Accuracy Digital Servo Disengaged (MFR_PWM_MODE l 0.03 ±0.2 %/V OUTn n[6] = 0b) 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_MODE l 0.2 0.5 % VOUTn n[6] = 0b) 0A ≤ IOUTn ≤ 10A, VOUT Low Range, (MFR_PWM_MODEn[1] = 1b) FREQUENCY_SWITCH = 425kHz (Note 5) VOUTn(AC) Output Voltage Ripple 10 mVP-P fS (Each VOUTn Ripple Frequency FREQUENCY_SWITCH Set to 500kHz (0xFBE8) l 475 500 525 kHz Channel) ∆VOUTn(START) Turn-On Overshoot TON_RISEn = 2ms (Note 12) 8 mV tSTART Turn-On Start-Up Time Time from VIN Toggling from 0V to 12V to Rising Edge of GPIOn. TON_ l 34 39 ms DELAYn = 0ms, TON_RISEn = 2ms, MFR_GPIO_PROPAGATEn = 0x0100, MFR_GPIO_RESPONSEn = 0x0000 tDELAY(0ms) Turn-On Delay Time Time from First Rising Edge of RUNn to Rising Edge of GPIOn. TON_ l 2.75 3.1 3.5 ms DELAYn = 0ms, TON_RISEn = 3ms, MFR_GPIO_PROPAGATEn = 0x0100, MFR_GPIO_RESPONSEn = 0x0000. VIN Having Been Established for at Least 39ms Rev. B 4 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 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 Applications Information 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 LTM4686 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 Photographs Package Description Revision History Typical Application Design Resources Related Parts