Datasheet LTC3884, LTC3884-1 (Analog Devices) - 7

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
BG RDOWN BG Pull-Down RDS(ON) BG Low 1.1 Ω 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 30 ns tf Fall Time CLOAD = 3300pF 30 ns TG/BG, t1D Top Gate Off to Bottom Gate on (Note 4) CLOAD = 3300pF at Each Driver 30 ns Delay Time BG/TG t2D Bottom Gate Off to Top Gate on (Note 4) CLOAD = 3300pF at Each Driver 30 ns Delay Time tON(MIN) Minimum On-Time 60 ns
PWM0/PWM1 Outputs (LTC3884-1)
PWM PWM Output High Voltage ILOAD = 500µA VCC – 0.2 V PWM Output Low Voltage ILOAD = –500µA 0.2 V PWM Output in Hi-Z State –5 5 µA
OV/UV Output Voltage Supervisor Channel 0/1
N Resolution 9 Bits VOUSTPSP_RL LSB Step Size MFR_PWM_MODE[1] = 1 (Note 13) 5.6 mV VOUSTPSP_RH LSB Step Size MFR_PWM_MODE[1] = 0 (Note 13) 11.2 mV VRANGE_RL Voltage Monitoring Range MFR_PWM_MODE[1] = 1 0.5 2.7 V VRANGE_RH Voltage Monitoring Range MFR_PWM_MODE[1] = 0 1 5.6 V VTHAC0_RL Threshold Accuracy 1V < VOUT < 2.5V MFR_PWM_MODE[1] = 1 l ±1.5 % VTHAC1_RH Threshold Accuracy 2V < VOUT < 5.5V MFR_PWM_MODE[1] = 0 l ±1.5 % tPROPOV OV Comparator Response Time VOD = 10% of Threshold 100 µs tPROPUV UV Comparator Response Time VOD = 10% of Threshold 100 µs
VIN Voltage Supervisor
N Resolution 9 Bits VINSTP LSB Step Size 76 mV VIN Full-Scale Voltage 4.5 38 V VINTHACCM Threshold Accuracy 9V < VIN < 38V ±3 % Threshold Accuracy 4.5V < VIN ≤ 9V ±6.0 % tPROPVIN Comparator Response Time VOD = 10% of threshold 100 µs (VIN_ON and VIN_OFF)
Output Voltage Readback
N Resolution 16 Bits VOUTSTP LSB Step Size 244 µV VF/S Full-Scale Sense Voltage VRUNn = 0 (Note 8) 8 V VOUT_TUE Total Unadjusted Error VOUT > 0.6V (Note 8) l –0.5 0.5 % VOS Zero-Code Offset Voltage ±500 µV tCONVERT Update Rate (Note 6) 90 ms
VIN Voltage Readback
N Resolution (Note 5) 10 Bits 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 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