Datasheet LTM4686, LTM4686-1 (Analog Devices) - 8

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 Temperature Readback for Channel 0, Channel 1, and Controller (Respectively: READ_TEMPERATURE_10, READ_TEMPERATURE_11, and READ_TEMPERATURE_2)
TRES-RB Temperature Readback Channel 0, Channel 1, and Controller (Note 15) 0.0625 °C Resolution TRB-CH-ACC(72mV) Channel Temperature Channels 0 and 1, PWM Inactive, RUNn = 0V, l Within ±3°C of Reading TUE, Switching Action ∆VTSNSna = 72mV Off TRB-CH-ACC(ON) Channel Temperature READ_TEMPERATURE_1n, Channels 0 and 1, Within ±3°C of Reading TUE, Switching Action PWM Active, RUNn = 5V (Note 12) On TRB-CTRL-ACC(ON) Control IC Die READ_TEMPERATURE_2, PWM Active, RUN0 = RUN1 = 5V Within ±1°C of Reading, Typ Temperature TUE, (Note 12) Switching Action On tCONVERT-TEMP-RB Temperature Readback MFR_ADC_CONTROL=0x00 (Notes 9, 15) 90 ms Update Rate MFR_ADC_CONTROL=0x06 or 0x0A (Notes 9, 15) 8 ms
INTVCC Regulator
VINTVCC Internal VCC Voltage 6V ≤ VIN ≤ 17V 4.8 5 5.2 V No Load ∆VINTVCC(LOAD) INTVCC Load 0mA ≤ IINTVCC ≤ 50mA 0.5 ±2 % Regulation VINTVCC
VDD33 Regulator
VVDD33 Internal VDD33 Voltage 3.2 3.3 3.4 V ILIM(VDD33) VDD33 Current Limit VDD33 Electrically Short-Circuited to GND 70 mA VVDD33_OV VDD33 Overvoltage (Note 15) 3.5 V Threshold VVDD33_UV VDD33 Undervoltage (Note 15) 3.1 V Threshold
VDD25 Regulator
VVDD25 Internal VDD25 Voltage 2.5 V ILIM(VDD25) VDD25 Current Limit VDD25 Electrically Short-Circuited to GND 50 mA
Oscillator and Phase-Locked Loop (PLL)
fOSC Oscillator Frequency FREQUENCY_SWITCH = 500kHz (0xFBE8) l ±5 % Accuracy 250kHz ≤ FREQUENCY_SWITCH ≤ 1MHz (Note 15) ±5 % fSYNC PLL SYNC Capture (Note 16) l 225 1050 kHz Range VTH,SYNC SYNC Input Threshold VSYNC Rising (Note 15) 1.5 V VSYNC Falling (Note 15) 1 V VOL,SYNC SYNC Low Output ISYNC = 3mA l 0.3 0.4 V Voltage ISYNC SYNC Leakage Current 0V ≤ VSYNC ≤ 3.6V l ±5 µA in Frequency Slave MFR_CONFIG_ALL[4]=1b Mode θSYNC-θ0 SYNC-to-Channel 0 (Note 15) Phase Relationship, MFR_PWM_CONFIG[2:0] = 000b, 01Xb 0 Deg Lag from Falling Edge MFR_PWM_CONFIG[2:0] = 101b 60 Deg of Sync to Rising Edge MFR_PWM_CONFIG[2:0] = 001b 90 Deg of Top MOSFET (MT0) MFR_PWM_CONFIG[2:0] = 1X0b 120 Deg Gate Rev. B 8 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