Datasheet LTC3884, LTC3884-1 (Analog Devices) - 8

LTC3884/LTC3884-1
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Notes 2, 3). VIN = 12V, EXTVCC = 0V, VRUN0,1 = 3.3V, fSYNC = 500kHz (externally driven) and all programmable parameters at factory default, unless otherwise specified. SYMBOL PARAMETER CONDITION MIN TYP MAX UNITS
VF/S Full-Scale Input Voltage (Note 11) 43 V VINTUE Total Unadjusted Error VVIN > 4.5V (Note 8) 0.5 % l 2 % tCONVERT Update Rate (Note 6) 90 ms
Output Current Readback
N Resolution (Note 5) 10 Bits V + – IOUTSTP LSB Step Size 0V ≤ |VISENSE – VISENSE | < 16mV 15.63 µV 16mV ≤ |V + – ISENSE – VISENSE | < 32mV 31.25 µV 32mV ≤ |V + – ISENSE – VISENSE | < 64mV 62.5 µV 64mV ≤ |V + – ISENSE – VISENSE | < 128mV 125 µV IF/S Full-Scale Input Current (Note 7) DCR or RISENSE = 1mΩ ±128 A I + – OUT_TUE Total Unadjusted Error VISENSE – VISENSE > 6mV (Note 8) l ±1.25 % VOS Zero-Code Offset Voltage ±50 µV tCONVERT Update Rate (Note 6) 90 ms
Input Current Readback
N Resolution (Note 5) 10 Bits V + – IINSTP LSB Step Size Full-Scale Range = 16mV Gain = 8, 0V ≤ |VIIN – VIIN | ≤ 5mV 15.26 µV LSB Step Size Full-Scale Range = 32mV Gain = 4, 0V ≤ |V + – IIN – VIIN | ≤ 20mV 30.52 µV LSB Step Size Full-Scale Range = 64mV Gain = 2, 0V ≤ |V + – IIN – VIIN | ≤ 50mV 61 µV I + – IN_TUE Total Unadjusted Error Gain = 8, 2.5mV ≤ |VIIN – VIIN | VIN = 8V (Note 8) l ±2 % Gain = 4, 4mV ≤ |V + – IIN – VIIN | VIN = 8V (Note 8) l ±1.3 % Gain = 2, 6mV ≤ |V + – IIN – VIIN | VIN = 8V (Note 8) l ±1.2 % VOS Zero-Code Offset Voltage ±50 µV tCONVERT Update Rate (Note 6) 90 ms
Supply Current Readback
N Resolution (Note 5) 10 Bits VICHIPSTP LSB Step Size Full-Scale Range = 244 µV 256mV I + CHIPTUE Total Unadjusted Error |VIIN – VIN| ≤ 150mV (Note 19) l ±3 % tCONVERT Update Rate (Note 6) 90 ms
Temperature Readback (T0, T1)
TRES_T Resolution 0.25 °C T0_TUE External Temperature Total TSNS0, TSNS1 ≤ 1.85V (Note 8) Unadjusted Readback Error MFR_PWM_MODE_[5] = 0 –3 3 °C MFR_PWM_MODE_[5] = 1 (Note 14) –10 10 °C T1_TUE Internal TSNS TUE VRUN0,1 = 0.0, fSYNC = 0kHz (Note 8) ±1 °C tCONVERT Update Rate (Note 6) 90 ms
INTVCC Regulator/EXTVCC
VINTVCC Internal VCC Voltage No Load 6V ≤ VIN ≤ 38V 5.25 5.5 5.75 V VLDO_INT INTVCC Load Regulation ICC = 0mA to 20mA, 6V ≤ VIN ≤ 38V 0.5 ±2 % VEXTVCC EXTVCC Switchover Voltage VIN ≥ 7V, EXTVCC Rising 4.5 4.7 V VLDO_HYS EXTVCC Hysteresis 290 mV VLDO_EXT EXTVCC Voltage Drop ICC = 20mA, VEXTVCC = 5.5V 50 100 mV Rev. F 8 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 Time-Based Sequencing Voltage-Based Sequencing Shutdown Light-Load Current Operation Switching Frequency and Phase PWM Loop Compensation Output Voltage Sensing INTVCC/EXTVCC Power Output Current Sensing and Sub Milliohm DCR Current Sensing Input Current Sensing PolyPhase Load Sharing External/Internal Temperature Sense RCONFIG (Resistor Configuration) Pins Fault Detection and Handling Status Registers and ALERT Masking Mapping Faults to FAULT Pins Power Good Pins CRC Protection and ECC Serial Interface Communication Protection Device Addressing Responses to VOUT, IIN 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 Response External Overtemperature and Undertemperature Fault Response Responses to Input Overcurrent and Output Undercurrent Faults 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 *Data Format Applications Information Current Limit Programming ISENSE0± and ISENSE1± Pins Inductor DCR Sensing Inductor Value Calculation Inductor Core Selection Low Value Resistor Current Sensing Slope Compensation and Inductor Peak Current Power MOSFET and Optional Schottky Diode Selection Variable Delay Time, Soft-Start and Output Voltage Ramping Digital Servo Mode Soft Off (Sequenced Off) INTVCC/EXTVCC Power Topside MOSFET Driver Supply (CB, DB) Undervoltage Lockout CIN and COUT Selection Fault Indication Open-Drain Pins Phase-Locked Loop and Frequency Synchronization Minimum On-Time Considerations External Temperature Sense 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 Master Slave Operation PC Board Layout Checklist PC Board Layout Debugging Design Example Additional Design Checks Connecting the USB to I2C/SMBus/PMBus Controller to the LTC3884 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 NVM Memory Commands Store/Restore Fault Log Operation Fault Logging Block Memory Write/Read Typical Applications Package Description Revision History Typical Application Related Parts