Datasheet LTC3889 (Analog Devices) - 7

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 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 % IIIN Input Current, IIN+ and IIN– VVIN = VIIN+ = VIIN– = 60V 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_LTC3889[5] = 0 �VTSNS = 72mV (Note 17) l ±3 °C MFR_PWM_MODE_LTC3889[5] = 1 VTSNS ≤ 1.85V (Note 17) l ±7 °C TI_TUE Internal TSNS TUE VRUN = 0.0V, fSYNC = 0kHz (Note 8) ±1 °C tCONVERT_T Update Rate (Note 6) 90 ms
DRVCC Regulator
VDRVCC_VIN DRVCC Voltage No Load 8V < VIN < 60V, DRVSET = 0 6.1 6.3 6.5 V 11V < VIN < 60V, DRVSET = 1 7.2 7.4 7.6 V 11V < VIN < 60V, DRVSET = 2 8.6 9 9.4 V VLDO_VIN DRVCC Load Regulation ICC = 0mA to 50mA, EXTVCC = 0, DRVSET = 2 0.5 ±2 % VDRVCC_EXT DRVCC Voltage No Load 7V < EXTVCC < 14V, DRVSET = 0 6.1 6.3 6.5 V 11V < EXTVCC < 14V, DRVSET = 1 7.2 7.4 7.6 V 11V < EXTVCC < 14V, DRVSET = 2 8.6 9 9.4 V VLDO_EXT DRVCC Load Regulation ICC = 0mA to 50mA, EXTVCC = 12V, DRVSET = 2 0.5 ±2 % VEXT_THRES EXTVCC Switchover Voltage EXTVCC Ramping Positive, DRVSET = 0 l 5.0 5.35 5.6 V EXTVCC Ramping Positive, DRVSET = 1, 2 l 7.4 7.7 8.0 V VEXT_HYS EXTVCC Hysteresis Voltage 110 mV
VDD33 Regulator
VDD33 Internal VDD33 Voltage 5.0V < VDRVCC 3.2 3.3 3.4 V ILIM VDD33 Current Limit VDD33 = GND, VIN = DRVCC = 5.0V 35 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, VDD33 = 3.6V 80 mA
Oscillator and Phase-Locked Loop
fOSC Oscillator Frequency Accuracy 85kHz < fSYNC < 500kHz Measured Falling l ±10 % Edge-to-Falling Edge of SYNC with FREQUENCY_SWITCH = 85kHz and 500.0kHz Rev. 0 For more information www.analog.com 7 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