LTM4677 datasheet(2/132 Pages) AD

2 / 132 page

LTM4681

Rev. 0

For more information www.analog.com

TABLE OF CONTENTS

Features..................................................... 1

Applications ................................................ 1

Typical Application ........................................ 1

Description.................................................. 1

Table of Contents .......................................... 2

Absolute Maximum Ratings.............................. 4

Order Information.......................................... 4

Pin Configuration .......................................... 4

Electrical Characteristics................................. 5

Typical Performance Characteristics ..................12

Pin Functions ..............................................16

Simplified Block Diagram ...............................24

Decoupling Requirements...............................24

Functional Diagram ......................................25

Test Circuits ...............................................26

Test Circuits ...............................................27

Operation...................................................28

Power Module Introduction ....................................28

Power Module Overview, Major Features................28

EEPROM with ECC..................................................29

Power-Up and Initialization .....................................30

Soft-Start................................................................31

Time-Based Sequencing .........................................31

Voltage-Based Sequencing .....................................32

Shutdown ...............................................................32

Light-Load Current Operation .................................32

Switching Frequency and Phase .............................33

PWM Loop Compensation......................................33

Output Voltage Sensing ..........................................33

INTVCC/VBIAS Power...............................................33

Output Current Sensing and Sub Milliohm DCR

Current Sensing......................................................34

Input Current Sensing.............................................34

PolyPhase Load Sharing.........................................34

Internal Temperature Sense....................................35

RCONFIG (Resistor Configuration) Pins..................35

Table 1. VOUT

n _CFG Pin Strapping Look-Up Table

for the LTM4681’s Output Voltage, Coarse Setting

(Not Applicable if MFR_CONFIG_ALL[6] = 1b) Top

Resistor = 14.3k..................................................36

Table 2. VTRIMn_CFG Pin Strapping Look-Up

Table for the LTM4681’s Output Voltage, Fine

Adjustment Setting (Not Applicable if MFR_

CONFIG_ALL[6] = 1b) Top Resistor = 14.3k........36

Table 3. FSWPH_

nn_CFG Pin Strapping Look-Up

Table to Set the LTM4681’s Switching Frequency

and Channel Phase-Interleaving Angle (Not

Applicable if MFR_CONFIG_ALL[6] = 1b),

nn = 0,1

or 2,3 Channels, set top resistor to 14.3k...........37

Table 4. ASEL_

nn Pin Strapping Look-Up Table

to Set the LTM4681’s Slave Address (Applicable

Regardless of MFR_CONFIG_ALL[6] Setting)....38

Table 5. LTM4681 MFR_ADDRESS Command

Examples Expressed in 7- and 8-Bit Addressing 38

Fault Detection and Handling..................................38

Status Registers and ALERT Masking...................39

Figure 5. LTM4681 Status Register Summary per

Controller............................................................40

Mapping Faults to FAULT

n Pins............................. 41

Power Good Pins.................................................. 41

CRC Protection ..................................................... 41

Serial Interface ....................................................... 41

Communication Protection ................................... 41

Device Addressing.................................................. 41

Responses to VOUT and IIN/IOUT Faults ...................42

Output Overvoltage Fault Response .....................42

Output Undervoltage Response............................43

Peak Output Overcurrent Fault Response .............43

Responses to Timing Faults....................................43

Responses to VIN OV Faults....................................43

Responses to OT/UT Faults.....................................43

Internal Overtemperature Fault Response.............43

Overtemperature and Undertemperature

Fault Response...................................................44

Responses to Input Overcurrent and Output

Undercurrent Faults ................................................44

Responses to External Faults..................................44

Fault Logging..........................................................44

Bus Timeout Protection ..........................................44

Similarity Between PMBus, SMBus and I2C 2-Wire

Interface .................................................................45

PMBus Serial Digital Interface ................................45

Table 6. Abbreviations of Supported Data Formats ... 46

Figure 6. PMBus Timing Diagram.........................46

Figure 7 to Figure 24 PMBus Protocols ..................47

PMBus Command Summary ............................50

PMBus Commands .................................................50

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