Datasheet LTC3883, LTC3883-1 (Analog Devices) - 6

LTC3883/LTC3883-1
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 = 12V, VRUN = 3.3V, fSYNC = 500kHz (externally driven) unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Gate Driver
TG TG Transition Time: (Note 4) tr Rise Time CLOAD = 3300pF 30 ns tf Fall Time CLOAD = 3300pF 30 ns BG BG Transition Time: (Note 4) tr Rise Time CLOAD = 3300pF 20 ns tf Fall Time CLOAD = 3300pF 20 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay Time (Note 4) CLOAD = 3300pF 10 ns BG/TG t2D Bottom Gate Off to Top Gate On Delay Time (Note 4) CLOAD = 3300pF 30 ns tON(MIN) Minimum On-Time 45 ns
OV/UV Output Voltage Supervisor
N Resolution 8 bits VRANGE0 Voltage Range Range Value = 0 1 5.5 V VRANGE1 Voltage Range Range Value = 1 0.4 2.7 V VOUSTP0 Step Size Range Value = 0 22 mV VOUSTP1 Step Size Range Value = 1 11 mV VTHACC0 Threshold Accuracy 2V < VOUT < 5V Range Value = 0 l ±2 % VTHACC1 Threshold Accuracy 0.9V < VOUT < 2.5V Range Value = 1 l ±2 % tPROPOV1 OV Comparator to GPIO Low Time VOD = 10% of Threshold 35 µs tPROPUV1 UV Comparator to GPIO Low Time VOD = 10% of Threshold 35 µs
VIN Voltage Supervisor
N Resolution 8 bits VINRANGE Full-Scale Voltage 4.5 20 V VINSTP Step Size 82 mV VINTHACC Threshold Accuracy 8.75V < VIN < 20V l ±2.5 % tPROPVIN Comparator Response Time VOD = 10% of Threshold 100 µs (VIN_ON and VIN_OFF)
Output Voltage Readback
N Resolution 16 Bits LSB Step Size 244 µV VF/S Full-Scale Sense Voltage (Note 10) VRUN = 0V (Note 8) 8 V VOUT_TUE Total Unadjusted Error TJ = 25°C, VOUT > 0.6V 0.2 % (Note 8) l 0.5 % VOS Zero-Code Offset Voltage l ±500 µV tCONVERT Conversion Time (Note 6) 80 ms
VIN Voltage Readback
N Resolution (Note 5) 10 Bits VF/S Full-Scale Input Voltage (Note 11) 38.91 V VIN_TUE Total Unadjusted Error TJ = 25°C, VVIN > 4.5V 0.4 % l 2 % tCONVERT Conversion Time (Note 6) 80 ms
Output Current Readback
N Resolution (Note 5) 10 Bits LSB Step Size 0V ≤ |V + – ISENSE – VISENSE | < 16mV 15.25 µV 16mV ≤ |V + – ISENSE – VISENSE | < 32mV 31.25 µV 32mV ≤ |V + – ISENSE – VISENSE | < 63.9mV 62.5 µV 63.9mV ≤ |V + – ISENSE – VISENSE | < 127.9mV 125 µV IF/S Full-Scale Input Current (Note 7) RISENSE = 1mΩ ±128 A IOUT_TUE Total Unadjusted Error (Note 8) VISENSE > 6mV l ±1 % Rev. F 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Table of Contents Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Overview Main Control Loop EEPROM Power Up and Initialization Soft-Start Sequencing Voltage-Based Sequencing Shutdown Light Load Current Operation Switching Frequency and Phase Output Voltage Sensing Output Current Sensing Auto Calibration Accurate DCR Temperature Compensation Input Current Sensing Load Sharing External/Internal Temperature Sense RCONFIG (Resistor Configuration) Pins Fault Detection and Handling Internal Memory with CRC and ECC Serial Interface Communication Failure 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 Overtemperature Fault Response—Internal Overtemperature and Undertemperature Fault Response—Externals Responses To Input Overcurrent And Output Undercurrent Faults Responses to External Faults Fault Logging Bus Timeout Failure Similarity Between PMBus, SMBus and I2C 2-Wire Interface PMBus Serial Digital Interface PMBus Command Summary PMBus Commands *Data Format 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 Schottky Diode (Optional) Selection Variable Delay Time, Soft-Start and Output Voltage Ramping Digital Servo Mode Soft Off (Sequenced Off) INTVCC Regulator Topside MOSFET Driver Supply (CB, DB) Undervoltage Lockout CIN and COUT Selection Fault Conditions Open-Drain Pins Phase-Locked Loop and Frequency Synchronization Minimum On-Time Considerations Input Current Sense Amplifier RCONFIG (External Resistor Configuration Pins) Voltage Selection Frequency and Phase Selection Using RCONFIG Address Selection Using RCONFIG Efficiency Considerations Checking Transient Response PolyPhase Configuration PC Board Layout Checklist PC Board Layout Debugging Design Example Connecting the USB to I2C/SMBus/PMBus Controller to the LTC3883 In System Inductor DCR Auto Calibration Accurate DCR Temperature Compensation 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 Current Output Current Calibration Output Current Input Current Calibration Input Current Temperature External Temperature Calibration External Temperature Limits 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 Telemetry NVM Memory Commands Store/Restore Fault Logging Block Memory Write/Read Typical Applications Package Description Revision History Typical Application Related Parts