Datasheet LTC3889 (Analog Devices) - 6

LTC3889
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TJ = 25°C (Note 2). VIN = 16V, EXTVCC = 0V, VRUN0 = 1.8V, VRUN1 = 1.8V fSYNC = 250kHz (externally driven), and all programmable parameters at factory default unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS OV/UV Output Voltage Supervisor
N Resolution 9 Bits VRANGE0 Range 0 Maximum Threshold 40 V VRANGE1 Range 1 Maximum Threshold 8 V VOUSTP0 Range 0 Step Size, FSR = 41.48V (Note 10) 81 mV VOUSTP1 Range 1 Step Size, FSR = 8.30V 16.2 mV VTHACC0 Range 0 Threshold Accuracy 6V < VOUT < 38V l ±2.5 % VTHACC1 Range 1 Threshold Accuracy 2.5V < VOUT < 8V l ±2.5 % tPROPOV1 OV Comparator to FAULT Low Time VOD = 10% of Threshold 35 µs tPROPUV1 UV Comparator to FAULT Low Time VOD = 10% of Threshold 35 µs
VIN Voltage Supervisor
N Resolution 9 Bits VIN(RANGE) Maximum Threshold (Note 11) 31.56 V VIN(STP) Step Size 61.6 mV VIN(THACCH) Threshold Accuracy 6V < VIN < 30V l ±3 % tPROP(VIN) Comparator Response Time VOD = 10% of Threshold 100 µs (VIN_ON and VIN_OFF)
Output Voltage Readback
N Resolution 16 Bits LSB Step Size 977 µV VF/S Full-Scale Sense Voltage (Note 10) VRUN = 0V (Note 8) 45 V VOUT_TUE Total Unadjusted Error TJ = 25°C, 3V < VOUT < 38V 0.2 % (Note 8) l ±0.5 % VOS Zero-Code Offset Voltage l ±2 mV tCONVERT Conversion Time (Note 6) 90 ms
VIN Voltage Readback
N Resolution (Note 5) 10 Bits VF/S Full-Scale Input Voltage (Note 11) 66.56 V VIN_TUE Total Unadjusted Error TJ = 25°C, 5V < VIN < 60V 0.5 % l 2 % tCONVERT Conversion Time (Note 6) 90 ms
Output Current Readback
N Resolution (Note 5) 10 Bits LSB Step Size 0V ≤ |V + – ISENSE – VISENSE | < 16mV 15.26 µV 16mV ≤ |V + – ISENSE – VISENSE | < 32mV 30.52 µV 32mV ≤ |V + – ISENSE – VISENSE | < 64mV 61 µV 64mV ≤ |V + – ISENSE – VISENSE | < 100mV 122 µV IF/S Full-Scale Output Current (Note 7) RISENSE = 1mΩ ±100 A IOUT_TUE Total Unadjusted Error (Note 8) 10mV ≤ VISENSE ≤ 100mV l ±1.5 % VOS Zero-Code Offset Voltage ±32 µV tCONVERT Conversion Time (Note 6) 90 ms Rev. 0 6 For more information www.analog.com Document Outline Table of Contents Features Applications Typical Application Description Table of Contents Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Overview Main Control Loop EEPROM CRC Protection Power-Up and Initialization Soft-Start Time-Based Sequencing Event-Based Sequencing Shutdown Light-Load Current Operation PWM Loop Compensation Switching Frequency and Phase Output Voltage Sensing Output Current Sensing Input Current Sensing PolyPhase Load Sharing External/Internal Temperature Sense RCONFIG (Resistor Configuration) Pins Fault Handling Status Registers and ALERT Masking Mapping Faults to FAULT Pins Power Good Pins Serial Interface Communication Protection Device Addressing Responses to VOUT and 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/Warn Response External Overtemperature and Undertemperature Fault Response Responses to External Faults Fault Logging Bus Timeout Protection Similarity Between PMBus, SMBus and I2C 2-Wire Interface PMBus Serial Digital Interface PMBus Command Summary PMBus Commands Applications Information Current Limit Programming ISENSE+ and ISENSE– Pins Low Value Resistor Current Sensing Inductor DCR Current Sensing Slope Compensation and Inductor Peak Current Inductor Value Calculation Inductor Core Selection Power MOSFET and Optional Schottky Diode Selection CIN and COUT Selection Variable Delay Time, Soft-Start and Output Voltage Ramping Digital Servo Mode Soft Off (Sequenced Off) DRVCC Regulator Topside MOSFET Driver Supply (CB, DB) Undervoltage Lockout Fault Indications Open-Drain Pins Phase-Locked Loop and Frequency Synchronization Minimum On-Time Considerations External Temperature Sense Derating EEPROM Retention at Temperature Input Current Sense Amplifier External Resistor Configuration Pins (RCONFIG) Voltage Selection Frequency Selection Phase Selection Address Selection Using RCONFIG Efficiency Considerations Programmable Loop Compensation Checking Transient Response PolyPhase Configuration PC Board Layout Checklist PC Board Layout Debugging Design Example Additional Design Checks Connecting the USB to I2C/SMBus/PMBus Adapter to the LTC3889 In System LTpowerPlay: An Interactive GUI for Digital Power PMBus Communication and Command Processing 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 EEPROM Memory Commands Store/Restore Fault Logging Fault Log Operation Block Memory Write/Read Typical Applications Package Description Typical Application Related Parts