LTM4675 datasheet(2/128 Pages) LINER

2 / 128 page

LTC3884/LTC3884-1

3884fe

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TABLE OF CONTENTS

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

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

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

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

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

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

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

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

Electrical Characteristics................................. 6

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

Pin Functions ..............................................17

Block Diagram.............................................19

Operation...................................................20

Overview.................................................................20

Main Control Loop..................................................21

EEPROM .................................................................21

Power-Up and Initialization .....................................22

Soft-Start................................................................23

Time-Based Sequencing .........................................23

Voltage-Based Sequencing .....................................23

Shutdown ............................................................... 24

Light-Load Current Operation ................................. 24

Switching Frequency and Phase .............................25

PWM Loop Compensation......................................25

Output Voltage Sensing ..........................................25

INTVCC/EXTVCC Power...........................................25

Output Current Sensing and Sub Milliohm DCR

Current Sensing......................................................26

Input Current Sensing.............................................27

PolyPhase Load Sharing.........................................27

External/Internal Temperature Sense......................27

RCONFIG (Resistor Configuration) Pins..................28

Fault Detection and Handling..................................29

Status Registers and ALERT Masking.................29

Mapping Faults to FAULT Pins ............................31

Power Good Pins................................................31

CRC Protection and ECC.....................................31

Serial Interface .......................................................32

Communication Protection.................................32

Device Addressing..................................................32

Responses to VOUT, IIN and IOUT Faults...................32

Output Overvoltage Fault Response ...................33

Output Undervoltage Response..........................33

Peak Output Overcurrent Fault Response...........33

Responses to Timing Faults....................................33

Responses to VIN OV Faults....................................34

Responses to OT/UT Faults.....................................34

Internal Overtemperature Fault Response ..........34

External Overtemperature and

Undertemperature Fault Response .....................34

Responses to Input Overcurrent and Output

Undercurrent Faults ................................................34

Responses to External Faults..................................34

Fault Logging..........................................................34

Bus Timeout Protection ..........................................35

Similarity Between PMBus, SMBus and

I2C 2-Wire Interface................................................35

PMBus Serial Digital Interface ................................35

PMBus Command Summary ............................40

PMBus Commands .................................................40

*Data Format ..........................................................45

Applications Information ................................46

Current Limit Programming....................................46

ISENSE0± and ISENSE1± Pins......................................46

Inductor DCR Sensing ........................................47

Inductor Value Calculation ......................................48

Inductor Core Selection ..........................................48

Low Value Resistor Current Sensing.......................48

Slope Compensation and Inductor Peak Current ....49

Power MOSFET and Optional Schottky Diode

Selection.................................................................50

Variable Delay Time, Soft-Start and Output

Voltage Ramping ....................................................50

Digital Servo Mode ................................................. 51

Soft Off (Sequenced Off)........................................52

INTVCC/EXTVCC Power...........................................52

Topside MOSFET Driver Supply (CB, DB) ................53

Undervoltage Lockout.............................................54

CIN and COUT Selection ...........................................54

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