LTM4650 datasheet(2/138 Pages) AD

2 / 138 page

LTM4664A

Rev. 0

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TABLE OF CONTENTS

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

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

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

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

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

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

Order Information.......................................... 5

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

Typical Performance Characteristics ..................15

4:1 Divider Block Diagram ..............................25

Dual 25A/30A Power System Management (PSM)

Block Diagram.............................................26

4:1 Divider Operation ....................................27

4:1 Divider Description ...........................................27

Main Control...........................................................27

INTVCCS1,2/EXTVCCS1,2 Power................................27

Start-Up and Shutdown ..........................................28

Fault Protection and Thermal Shutdown.................28

High Side Current Sensing......................................28

Frequency Selection................................................28

Power Good and UV (PGOODS

n and UVSn pins)....29

Additional Overvoltage Protection ..........................29

4:1 Divider Application Information....................30

Voltage Divider Pre-Balance Before Switching........30

Overcurrent Protection ...........................................31

Window Comparator Programming ........................31

Effective Open Loop Output Resistance and

Load Regulation......................................................32

Undervoltage Lockout.............................................32

Fault Response and Timer Programming................32

Design Example......................................................33

Dual 25A/30A PSM Operation...........................35

PSM Section Overview, Major Features..................35

EEPROM with ECC .................................................36

Power-Up and Initialization ....................................37

Soft-Start ...............................................................38

Time-Based Sequencing ........................................38

Voltage-Based Sequencing ....................................38

Shutdown ..............................................................39

Light-Load Current Operation ................................39

Switching Frequency and Phase .............................40

PWM Loop Compensation .....................................40

Output Voltage Sensing .........................................40

INTVCC/EXTVCC Power ..........................................40

Output Current Sensing and Sub Milliohm DCR

Current Sensing ..................................................... 41

Input Current Sensing ............................................ 41

PolyPhase Load Sharing ........................................ 41

External/Internal Temperature Sense .....................42

RCONFIG (Resistor Configuration) Pins .................42

Fault Detection and Handling .................................45

Status Registers and ALERT Masking ....................46

Mapping Faults to FAULT Pins ...............................48

Power Good Pins ...................................................48

CRC Protection ......................................................48

Serial Interface ......................................................48

Communication Protection ....................................48

Device Addressing .................................................48

Responses to VOUT and IIN/IOUT Faults ..................49

Output Overvoltage Fault Response .......................49

Output Undervoltage Response .............................50

Peak Output Overcurrent Fault Response ..............50

Responses to Timing Faults ...................................50

Responses to VIN OV Faults ...................................50

Responses to OT/UT Faults ....................................50

Internal Overtemperature Fault Response ..............50

External Overtemperature and Undertemperature

Fault Response .................................................... 51

Responses to Input Overcurrent and Output

Undercurrent Faults ............................................... 51

Responses to External Faults ................................. 51

Fault Logging ......................................................... 51

Bus Timeout Protection ......................................... 51

Similarity Between PMBus, SMBus and I2C

2-Wire Interface .....................................................52

PMBus Serial Digital Interface ...............................52

Figure 11 thru Figure 28 PMBus Protocols .............54

PMBus Command Summary ............................57

PMBus Commands ................................................57

Dual 25A/30A PSM Applications Information.........63

VIN to VOUT Step-Down Ratios ...............................63

Input Capacitors ....................................................63

Output Capacitors ..................................................63

Light Load Current Operation .................................63

Switching Frequency and Phase ............................64

Output Current Limit Programming .......................65

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