Datasheet LTC3887, LTC3887-1, LTC3887-2 (Analog Devices) - 116

ManufacturerAnalog Devices
DescriptionDual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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TYPICAL APPLICATION. High Efficiency Dual 500kHz 3.3V/1.8V Step-Down Converter. RELATED PARTS PART NUMBER DESCRIPTION

TYPICAL APPLICATION High Efficiency Dual 500kHz 3.3V/1.8V Step-Down Converter RELATED PARTS PART NUMBER DESCRIPTION

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LTC3887/LTC3887-1/ LTC3887-2
TYPICAL APPLICATION High Efficiency Dual 500kHz 3.3V/1.8V Step-Down Converter
VIN 6V TO 24V 10µF 1µF 22µF D1 V D2 IN INTVCC M1 TG0 TG1 M2 0.1µF 0.1µF L0 L1 1.0µH BOOST0 BOOST1 0.56µH SW0 SW1 M3 BG0 BG1 M4 4.99k 2.0k SYNC 1.58k VDD25 1µF 10k 1µF SDA LTC3887 10k SCL 10k 16.2k 24.9k 10k 10k ALERT VOUT0_CFG 10k 15.8k 17.4k 5.76k 23.2k VDD33 GPIO0 ASEL1 GPIO1 V 10k OUT1_CFG SHARE_CLK FREQ_CFG RUN0 ASEL0 10k RUN1 PHAS_CFG WP TSNS0 TSNS1 I + + SENSEO ISENSE1 2.0k 0.22µF 0.22µF 1.58k V V I – – VOUT0 SENSEO ISENSE1 V OUT1 OUT1 OUT1 3.3V 1.8V 1.8V V + SENSEO VSENSE1 1.8V 15A 15A 15A V – 15A SENSEO + ITHO ITH1 4700pF + V 2200pF 530µF DD33 GND VDD25 530µF 4.99k 10nF 220pF 1µF 1µF 4.99k 220pF 10nF L0, L1: VISHAY IHLP-4040DZ-11 1µH, 0.56µH M1, M2: INFINEON BSC050NE2LS 3887 TA07 M3, M4: INFINEON BSC010NE2LSI 530µF: 330µF SANYO 4TPF330ML, 2x 100µF 12106D107KAT2A
RELATED PARTS PART NUMBER DESCRIPTION COMMENTS
LTM4676A Dual 13A or Single 26A Step-Down DC/DC µModule Regulator 4.5V ≤ VIN ≤26.5V; 0.5V ≤ VOUT ≤ 5.5V, ±0.5% VOUT Accuracy I2C/ with Digital Power System Management PMBus Interface, 16mm × 16mm × 5.01mm, BGA Package LTM4675 Dual 9A or Single 18A Step-Down DC/DC μModule Regulator 4.5V ≤ VIN ≤17V; 0.5V ≤ VOUT ≤ 5.5V, ±0.5% VOUT Accuracy I2C/PMBus with Digital Power System Management Interface, 11.9mm × 16mm × 3.51mm, BGA Package LTM4677 Dual 18A or Single 36A μModule Regulator with Digital Power 4.5V ≤ VIN ≤16V; 0.5V ≤ VOUT (±0.5%) ≤ 1.8V, I2C/PMBus Interface, System Management 16mm × 16mm × 5.01mm, BGA Package LTC3870/ 60V Dual Output Multiphase Step-Down Slave Controller for VIN Up to 60V, 0.5V ≤ VOUT ≤ 14V, Very High Output Current Applications LTC3870-1 Current Mode Control Applications with Digital Power System with Accurate Current Share Between Phases Supporting LTC3887/ Management LTC3887-1, LTC3883/LTC3883-1, LTC3886, LTC3880/LTC3880-1 LTC3884 Dual Output MultiPhase Step-Down Controller with Sub 4.5V ≤ VIN ≤ 38V, 0.5V ≤ VOUT (±0.5%) ≤ 5.5V, I2C/PMBus Interface, MilliOhm DCR Sensing Current Mode Control and Digital Programmable Analog Loop Compensation, Input Current Sense Power System Management LTC3882/ Dual Output Multiphase Step-Down DC/DC Voltage Mode 3V ≤ VIN ≤ 38V, 0.5V ≤ VOUT1,2 ≤ 5.25V, ±0.5% VOUT Accuracy I2C/ LTC3882-1 Controller with Digital Power System Management PMBus Interface, uses DrMOS or Power Blocks LTC3886 60V Dual Output Step-Down DC/DC Controller with Digital 4.5V ≤ VIN ≤ 60V, 0.5V ≤ VOUT0,1 (±0.5%) ≤ 13.8V, ±0.5% VOUT Power System Management Accuracy I2C/PMBus Interface, Input Current Sense LTC3883/ Single Phase Step-Down DC/DC Controller with Digital Power VIN Up to 24V, 0.5V ≤ VOUT ≤ 5.5V, Input Current Sense Amplifier, I2C/ LTC3883-1 System Management PMBus Interface with EEPROM and 16-Bit ADC, ±0.5% VOUT Accuracy LTC3880/ Dual Output Multiphase Step-Down DC/DC Controller with 4.5V ≤ VIN ≤ 24V, 0.5V ≤ VOUT ≤ 5.4V, ±0.5% VOUT Accuracy I2C/PMBus LTC3880-1 Digital Power System Management Interface with EEPROM and 16-Bit ADC. 145ms Start-Up LTC3815 6A Monolithic Synchronous DC/DC Step-Down Converter with 2.25V ≤ VIN ≤ 5.5V, 0.4V ≤ VOUT ≤ 0.72 VIN, Programmable VOUT Range Digital Power System Management ±25% with 0.1% Resolution, Up to 3MHz Operation with 13-Bit ADC Rev.F 116 D17091-0-8/19 www.analog.com For more information www.analog.com © ANALOG DEVICES, INC. 2015 -2019 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 (NVM) Power Up and Initialization Soft-Start Sequencing EVENT-Based Sequencing Shutdown Light Load Current Operation Switching Frequency and Phase Output Voltage Sensing Current Sensing PolyPhase Load Sharing External/Internal Temperature Sense RCONFIG (Resistor Configuration) Pins Fault Detection and Handling Internal EEPROM with CRC Protection and ECC 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 Schottky Diode (Optional) 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) (LTC3887, LTC3887-2) Undervoltage Lockout CIN and COUT Selection Fault Conditions Open-Drain Pins Phase-Locked Loop and Frequency Synchronization Minimum On-Time Considerations RCONFIG (External Resistor Configuration Pins) Voltage Selection Frequency and Phase Selection Using RCONFIG Address Selection Using RCONFIG Efficiency Considerations Checking Transient Response PC Board Layout Checklist PC Board Layout Debugging Design Example Additional Design Checks Connecting the USB to the I2C/SMBus/PMBus Controller to the LTC3887 In System LTpowerPlay: An Interactive GUI for Digital Power PMBus Communication and Command Processing PMBus Command Details Addressing and Write Protect General Configuration Registers On/Off/Margin PWM Config Voltage Input Voltage and Limits Output Voltage and Limits Current Input Current Calibration Output Current Calibration Input Current Output Current Temperature External Temperature Calibration External Temperature Limits 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 (EEPROM) Memory Commands Store/Restore Fault Logging Block Memory Write/Read Typical Applications Package Description Revision History Typical Application Related Parts
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