LTM4686B datasheet(2/130 Pages) AD

2 / 130 page

LTM4682

Rev. 0

For more information www.analog.com

TABLE OF CONTENTS

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

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

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

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

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

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

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

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

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

Pin Functions ..............................................15

Simplified Block Diagram ...............................23

Decoupling Requirements...............................23

Functional Diagram ......................................24

Test Circuits ...............................................25

Operation...................................................27

Power Module Introduction ....................................27

Power Module Overview, Major Features................27

EEPROM with ECC..................................................28

Power-Up and Initialization .....................................29

Soft-Start................................................................30

Time-Based Sequencing .........................................30

Voltage-Based Sequencing .....................................31

Shutdown ...............................................................31

Light-Load Current Operation .................................31

Switching Frequency and Phase .............................32

PWM Loop Compensation......................................32

Output Voltage Sensing ..........................................32

INTVCC/VBIAS Power...............................................32

Output Current Sensing and Sub Milliohm DCR

Current Sensing......................................................33

Input Current Sensing.............................................33

PolyPhase Load Sharing.........................................33

Internal Temperature Sense....................................34

RCONFIG (Resistor Configuration) Pins..................34

Table 1. VOUTn_CFG Pin Strapping Look-Up Table

for the LTM4682’s Output Voltage, Coarse Setting

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

Resistor = 14.3k......................................................35

Table 2. VTRIMn_CFG Pin Strapping Look-Up Table

for the LTM4682’s Output Voltage, Fine Adjustment

Setting (Not Applicable if MFR_CONFIG_ALL[6] =

1b) Top Resistor = 14.3k .........................................35

Table 3. FSWPH_nn_CFG Pin Strapping Look-Up

Table to Set the LTM4682’s Switching Frequency and

Channel Phase-Interleaving Angle (Not Applicable if

MFR_CONFIG_ALL[6] = 1b), nn = 01 or 23 Channels,

Set Top Resistor to 14.3k........................................36

Table 4. ASEL_nn Pin Strapping Look-Up Table to Set

the LTM4682’s Subordinate Address (Applicable

Regardless of MFR_CONFIG_ALL[6] Setting) ........37

Table 5. LTM4682 MFR_ADDRESS Command

Examples Expressed in 7- and 8-Bit Addressing.....37

Fault Detection and Handling..................................37

Status Registers and ALERT Masking .......................38

Figure 5. LTM4682 Status Register Summary per

Controller................................................................39

Mapping Faults to FAULTn Pins.................................40

Power Good Pins ......................................................40

CRC Protection .........................................................40

Serial Interface .......................................................40

Communication Protection .......................................40

Device Addressing..................................................40

Responses to VOUT and IIN/IOUT Faults ...................41

Output Overvoltage Fault Response.......................... 41

Output Undervoltage Response ................................42

Peak Output Overcurrent Fault Response .................42

Responses to Timing Faults....................................42

Responses to VIN OV Faults....................................42

Responses to OT/UT Faults.....................................42

Internal Overtemperature Fault Response.................42

Overtemperature and Undertemperature

Fault Response .......................................................43

Responses to Input Overcurrent and Output

Undercurrent Faults ................................................43

Responses to External Faults..................................43

Fault Logging..........................................................43

Bus Timeout Protection ..........................................43

Similarity Between PMBus, SMBus and I2C 2-Wire

Interface .................................................................44

PMBus Serial Digital Interface ................................44

Table 6. Abbreviations of Supported Data Formats...45

Figure 6. PMBus Timing Diagram .............................45

Figure 7 to Figure 24 PMBus Protocols ..................46

PMBus Command Summary ............................49

PMBus Commands .................................................49

Table 7. PMBus Commands Summary (Note: The Data

Format Abbreviations Are Detailed in Table 8)........49

Table 8. Data Format Abbreviations ..........................54

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