LTM4686B datasheet(2/132 Pages) AD

2 / 132 page

LTM4683

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 Major Features Overview ................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...............................................33

Output Current Sensing and Sub Milliohm DCR

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

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

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

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

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

Table 1. VOUTn_CFG Pin Strapping Look-Up Table

for the LTM4683’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 LTM4683’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 LTM4683’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 LTM4683’s Subordinate Address

(Applicable Regardless of MFR_CONFIG_ALL[6]

Setting)...............................................................37

Table 5. LTM4683 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. LTM4683 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.................................................. 41

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.....................................43

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

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 ..........................................44

Similarity Between PMBus, SMBus and I2C 2-Wire

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

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

Figure 7 to Figure 24 PMBus Protocols ..................45

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

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

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

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

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