Datasheet LTC3884, LTC3884-1 (Analog Devices) - 6

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 Input Voltage
VIN Input Voltage Range (Note 11) l 4.5 38 V IQ Input Voltage Supply Current VRUN0,1 = 3.3V (Note 16) 25 mA VRUN0,1 = 0V (Note 16) 23 mA VUVLO Undervoltage Lockout Threshold VINTVCC Falling 3.55 V When VIN > 4.3V VINTVCC Rising 3.90 V tINIT Initialization Time Time from VIN Applied Until the TON_DELAY 35 ms Timer Starts tOFF(MIN) Short Cycle Retry Time 120 ms
Control Loop
VOUTRL Full-Scale Voltage Range VOUT_COMMAND = 2.75V, l 2.7 2.8 V Set Point Accuracy (0.6V ~ 2.5V) MFR_PWM_MODE[1] = 1 l –0.5 0.5 % Resolution (Notes 9, 10, 13) 12 Bits LSB Step Size 0.688 mV VOUTRH Full-Scale Voltage Range VOUT_COMMAND = 5.5V, l 5.40 5.60 V Set Point Accuracy (0.6V ~ 5.0V) MFR_PWM_MODE[1] = 0 l –0.5 0.5 % Resolution (Notes 9, 10, 13) 12 Bits LSB Step Size 1.375 mV VLINEREG Line Regulation 6V < VIN < 38V l ±0.02 %/V VLOADREG Load Regulation ∆VITH = 1.35V ~ 0.7V l 0.01 0.1 % ∆VITH = 1.35V ~ 2V l –0.01 –0.1 % IISENSE0,1 Input Pin Bias Current 0V ≤ VPIN ≤ 5.5V l ±1 ±3 µA VSENSERIN0,1 VSENSE Input Resistance to GND 0V ≤ VPIN ≤ 5.5V 50 kΩ VILIMIT (Note 15) 12 Steps VILIM_HIGH MFR_PWM_MODE[7],[2]=0, 1, ILIM[3:0]=1100, VOUT ≤ 3.5V l 14.5 16.5 18.5 mV VILIM_LOW MFR_PWM_MODE[7],[2]=0, 1, ILIM[3:0]=0001, VOUT ≤ 3.5V 9.5 mV VREV MFR_PWM_MODE[7],[2]=0, 1, VOUT ≥ VOV –7.5 mV VILIM_HIGH MFR_PWM_MODE[7],[2]=1, 1, ILIM[3:0]=1100,VOUT ≤ 3.5V l 27.0 29.5 31.0 mV VILIM_LOW MFR_PWM_MODE[7],[2]=1, 1, ILIM[3:0]=0001,VOUT ≤ 3.5V 17.0 mV VREV MFR_PWM_MODE[7],[2]=1, 1, VOUT ≥ VOV –15 mV VILIM_HIGH MFR_PWM_MODE[7],[2]=0, 0, ILIM[3:0]=1100 l 35 41.38 49 mV VILIM_LOW MFR_PWM_MODE[7],[2]=0, 0, ILIM[3:0]=0001 25 mV VREV MFR_PWM_MODE[7],[2]=0, 0, VOUT ≥ VOV –18.8 mV VILIM_HIGH MFR_PWM_MODE[7],[2]=1, 0, ILIM[3:0]=1100 l 67.5 74.5 81.5 mV VILIM_LOW MFR_PWM_MODE[7],[2]=1, 0, ILIM[3:0]=0001 43.5 mV VREV MFR_PWM_MODE[7],[2]=1, 0, VOUT ≥ VOV –37.5 mV gm0,1 Resolution ITH0,1 = 1.35V, MFR_PWM_COMP[7:5] = 0 to 7 3 Bits Error Amplifier gm(MAX) 5.76 mmho Error Amplifier gm(MIN) 1 mmho LSB Step Size 0.68 mmho RTH0, 1 Resolution MFR_PWM_COMP[4:0] = 0 to 31 (See Figure 37) 5 Bits Compensation Resistor RTH(MAX) 62 kΩ Compensation Resistor RTH(MIN) 0 kΩ
Gate Drivers (LTC3884)
TG RUP TG Pull-Up RDS(ON) TG High 2.6 Ω TG RDOWN TG Pull-Down RDS(ON) TG Low 1.5 Ω BG RUP BG Pull-Up RDS(ON) BG High 2.4 Ω Rev. F 6 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