Datasheet LTC3886, LTC3886-1 (Analog Devices) - 7

LTC3886/LTC3886-1
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 = 16V, EXTVCC = 0V, VRUN0 = 3.3V, VRUN1 = 3.3V fSYNC = 350kHz (externally driven), and all programmable parameters at factory default unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Input Current Readback
N Resolution (Note 5) 10 Bits LSB Step Size, Full-Scale Range = 16mV 8x Gain, 0V ≤ |I + – IN – IIN | ≤ 5mV 15.26 µV LSB Step Size, Full-Scale Range = 32mV 4x Gain, 0V ≤ |I + – IN – IIN | ≤ 20mV 30.52 µV LSB Step Size, Full-Scale Range = 64mV 2x Gain, 0V ≤ |I + – IN – IIN | ≤ 50mV 61 µV I + – IN_TUE Total Unadjusted Error (Note 8) 8x Gain, 2.5mV ≤ |IIN – IIN | ≤ 5mV l ±1.6 % 4x Gain, 4mV ≤ |I + – IN – IIN | ≤ 20mV l ±1.3 % 2x Gain, 6mV ≤ |I + – IN – IIN | ≤ 50mV l ±1.2 % I + – IIN Input Current, IIN and IIN VIN = VIIN+ = VIIN– = 30V l ±2 µA VOS Zero-Code Offset Voltage ±50 µV tCONVERT Conversion Time (Note 6) 90 ms
Supply Current Readback
N Resolution (Note 5) 10 Bits LSB Step Size, Full-Scale Range = 256mV 244 µV I + CHIP_TUE Total Unadjusted Error 20mV ≤ |IIN – VIN| ≤ 200mV l ±2.5 % tCONVERT Conversion Time (Note 6) 90 ms
Temperature Readback (T0, T1)
TRES_T Resolution 0.25 °C T0_TUE External TSNS TUE (Note 8) MFR_PWM_MODE_LTC3886[5] = 0 �VTSNS = 72mV (Note 17) l ±3 °C MFR_PWM_MODE_LTC3886[5] = 1 VTSNS ≤ 1.85V (Note 17) l ±7 °C TI_TUE Internal TSNS TUE VRUN = 0.0V (Note 8) ±1 °C tCONVERT_T Update Rate (Note 6) 90 ms
INTVCC Regulator
VINTVCC_VIN Internal VCC Voltage No Load 6V < VIN < 60V l 4.8 5 5.2 V VLDO_VIN INTVCC Load Regulation ICC = 0mA to 50mA 0.5 ±2 % VINTVCC_EXT Internal VCC Voltage No Load 5.5V < EXTVCC < 14V l 4.8 5 5.2 V VLDO_EXT INTVCC Load Regulation ICC = 0mA to 50mA, EXTVCC = 12V 0.5 ±2 % VEXT_THRES EXTVCC Switchover Voltage EXTVCC Ramping Positive 4.5 4.7 4.95 V VEXT_HYS EXTVCC Hysteresis Voltage 80 mV
VDD33 Regulator
VDD33 Internal VDD33 Voltage 4.5V < VINTVCC 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 2.5 V ILIM VDD25 Current Limit VDD25 = GND, VIN = INTVCC = 4.5V 80 mA
Oscillator and Phase-Locked Loop
fOSC Oscillator Frequency Accuracy 100kHz < fSYNC < 750kHz Measured l ±10 % Falling Edge-to-Falling Edge of SYNC with FREQUENCY_SWITCH = 100.0 and 750.0 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 ILEAK(SYNC SYNC Leakage Current in Slave Mode 0V ≤ VPIN ≤ 3.6V ±5 µA Rev F For more information www.analog.com 7 Document Outline Table of Contents Features Power Conversion 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 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 CRC Protection 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 *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 Optional Schottky Diode Selection CIN and COUT 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 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 LTC3886 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 ON_OFF_CONFIG PWM Configuration Voltage Input Voltage and Limits Output Voltage and Limits For EnableMfrVoffThreshold = 0 For EnableMfrVoffThreshold = 1 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 Revision History Typical Application Related Parts