Datasheet LTC3883, LTC3883-1 (Analog Devices) - 7

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
VOS Zero-Code Offset Voltage ±28 µV tCONVERT Conversion Time (Note 6) 80 ms
Input Current Readback
N Resolution (Note 5) 10 Bits LSB Step Size 8x Gain, 0V ≤ |VIN_SNS – IIN_SNS| ≤ 8mV 15.26 µV 4x Gain, 0V ≤ |VIN_SNS – IIN_SNS| ≤ 20mV 30.52 µV 2x Gain, 0V ≤ |VIN_SNS – IIN_SNS| ≤ 50mV 61 µV IIN_TUE Total Unadjusted Error 8x Gain, VISENSE > 2.5mV (Note 8) l ±2.0 % 4x Gain, VISENSE > 4mV (Note 8) l ±1.5 % 2x Gain, VISENSE > 6mV (Note 8) l ±1.2 % VOS Zero-Code Offset Voltage ±50 µV tCONVERT Conversion Time (Note 6) 160 ms
Supply Current Readback
N Resolution (Note 5) 10 Bits LSB Step Size 122 µV ICHIP_TUE Total Unadjusted Error (LTC3883 Only) l ±5 % Total Unadjusted Error (LTC3883-1 Only) l ±200 µA tCONVERT Conversion Time (Note 6) 160 ms
Duty Cycle Readback
D_RES Resolution (Note 5) 10 Bits D_TUE Total Unadjusted Error 16.3% Duty Cycle –3 3 % tCONVERT Conversion Time (Note 6) 80 ms
Temperature Readback (T0, T1)
TRES_T Resolution 0.25 °C T0_TUE External TSNS TUE ∆VTSNS = 72mV (Note 8) l ±3 °C TI_TUE Internal TSNS TUE VRUN = 0.0V, fSYNC = 0kHz (Note 8) ±1 °C tCONVERT_T Update Rate (Note 6) 80 ms
INTVCC Regulator
VINTVCC Internal VCC Voltage No Load (LTC3883 Only) 6V < VIN < 24V 4.8 5 5.2 V VLDO_INT INTVCC Load Regulation (LTC3883 Only) ICC = 0mA to 50mA 0.5 ±2 %
VDD33 Regulator
VDD33 Internal VDD33 Voltage 4.5V < VINTVCC/VEXTVCC 3.2 3.3 3.4 V ILIM VDD33 Current Limit VDD33 = GND, VIN = INTVCC = 4.5V 100 mA VDD33_OV VDD33 Overvoltage Threshold 3.5 V VDD33_UV VDD33 Undervoltage Threshold 3.1 V
VDD25 Regulator
VDD25 Internal VDD25 Voltage 2.25 2.5 2.75 V ILIM VDD25 Current Limit VDD25 = GND, VIN = INTVCC = 4.5V 80 mA
Oscillator and Phase-Locked Loop
fOSC Oscillator Frequency Accuracy 250kHz < fSYNC < 1MHz Measured Falling l ±7.5 % Edge-to-Falling Edge of SYNC with SWITCH_FREQUENCY = 250.0.and 1000.0 VTH,SYNC SYNC Input Threshold VCLKIN Falling 1 V VCLKIN Rising 1.5 V VOL,SYNC SYNC Low Output Voltage ILOAD = 3mA l 0.2 0.4 V ILEAKSYNC SYNC Leakage Current in Slave Mode 0V ≤ VPIN ≤ 3.6V ±5 µA Rev. F For more information www.analog.com 7 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