Datasheet LTC3884, LTC3884-1 (Analog Devices) - 4

LTC3884/LTC3884-1
ABSOLUTE MAXIMUM RATINGS (Note 1)
V + – – – IN, IIN , IIN .. –0.3V to 40V VSENSE0 , VSENSE1 ... –0.3V to 0.3V (V + + – IN – IIN ), (IIN – IIN ) ... –0.3V to 0.3V EXTVCC, INTVCC... –0.3V to 6V BOOST0, BOOST1 (LTC3884) .. –0.3V to 46V (EXTVCC – VIN) ..5.5V Switch Transient Voltage (SW0, SW1) PGOOD0, PGOOD1 .. –0.3V to 3.6V (LTC3884) ... –5V to 40V RUN0, RUN1, SDA, SCL, ALERT .. –0.3V to 5.5V (BOOST0-SW0), (BOOST1-SW1) ASEL0, ASEL1, VOUT0_CFG0, VOUT1_CFG, (LTC3884) .. –0.3V to 6V FREQ_CFG, PHASE_CFG .. –0.3V to 2.75V Top Gate Transient Voltage TG0, TG1 FAULT0, FAULT1, SHARE_CLK, WP, SYNC –0.3V to 3.6V (LTC3884) ..–5V TO 46V TSNS0, TSNS1 .. –0.3V to 3.6V VCC0, VCC1 (LTC3884-1) ... –0.3V to 6V ITH0, ITH1, ITHR0, ITHR1 .. –0.3V to 3.6V Top Gate Transient Voltage PWM0, PWM1 Operating Junction Temperature Range (LTC3884-1) ... –0.3V to 6V (Notes 2, 17, 18) ...–40°C to 125°C I + – + – SENSE0 , ISENSE0 , ISENSE1 , ISENSE1 , Storage Temperature Range .. –65°C to 150°C* V + + SENSE0 , VSENSE1 .. –0.3V to 6V *See Derating EEPROM Retention at Temperature in Applications Informa- tion section for junction temperatures in excess of 125°C.
PIN CONFIGURATION
LTC3884 LTC3884 TOP VIEW TOP VIEW V CC V CC – + V CC – + V CC IN IN IN IN IN IN 48 PGOOD0 47 I 46 I 45 SW0 44 TG0 43 BOOST0 42 BG0 41 PGND 40 EXT 39 V 38 INT 37 BG1 48 I 47 I 46 SW0 45 TG0 44 BOOST0 43 BG0 42 PGND 41 EXT 40 V 39 INT V + PGOOD0 1 SENSE0 1 36 BOOST1 38 BG1 + V – V 2 37 BOOST1 SENSE0 2 35 TG1 SENSE0 V – 3 I + SENSE0 36 TG1 49 49 SENSE1 3 34 SW1 I + 4 35 SW1 I – SENSE1 SENSE1 4 33 PGOOD1 I – SENSE1 5 34 PGOOD1 I + THR0 5 32 VSENSE1 ITHR0 6 33 V + SENSE1 I – TH0 6 49 31 VSENSE1 ITH0 7 49 32 V – SENSE1 I + SGND + SENSE0 7 30 ITHR1 ISENSE0 8 SGND 31 ITHR1 I – – SENSE0 8 29 ITH1 ISENSE0 9 30 ITH1 TSNS1 9 28 V TSNS1 10 DD33 29 VDD33 TSNS0 10 27 SHARE_CLK TSNS0 11 28 SHARE_CLK SYNC 12 49 49 SYNC 11 26 WP 27 WP SCL 13 26 V SCL 12 25 V DD25 DD25 SDA 14 25 PHASE_CFG 13 15 16 17 19 20 16 17 18 20 21 T 14 21 22 22 23 T0 T1 T 15 T0 T1 SDA ALER RUN0 RUN0 FAUL FAUL RUN1 18 ASEL0 ASEL1 ALER FAUL FAUL RUN1 19 ASEL0 ASEL1 OUT0_CFG OUT0_CFG V V OUT1_CFG FREQ_CFG 23 V V OUT1_CFG FREQ_CFG 24 UK PACKAGE PHASE_CFG 24 RHE PACKAGE 48-LEAD (7mm × 7mm) PLASTIC QFN 48-LEAD (5mm × 6mm) PLASTIC GQFN TJMAX = 125°C, θJA = 31°C/W, θJC = 3°C/W TJMAX = 125°C, θJA = 31°C/W, θJC = 3.7°C/W EXPOSED PAD (PIN 49) IS SGND, MUST BE SOLDERED TO PCB EXPOSED PADS (PIN 49) ARE SGND, MUST BE SOLDERED TO PCB Rev. F 4 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