LTM4686 datasheet(3/132 Pages) AD

3 / 132 page

LTM4683

Rev. 0

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TABLE OF CONTENTS

Table 7. PMBus Commands Summary (NOTE: The

Data Format Abbreviations are Detailed in Table 8). 49

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

Applications Information ................................55

VIN to VOUT Step-Down Ratios................................55

Input Capacitors .....................................................55

Output Capacitors...................................................55

Light Load Current Operation .................................55

Switching Frequency and Phase .............................56

Output Current Limit Programming ........................57

Minimum On-Time Considerations..........................58

Variable Delay Time, Soft-Start and Output Voltage

Ramping .................................................................58

Digital Servo Mode .................................................58

Soft Off (Sequenced Off)........................................59

Undervoltage Lockout.............................................60

Fault Detection and Handling..................................60

Open-Drain Pins .....................................................61

Phase-Locked Loop and Frequency Synchronization .. 61

Input Current Sense Amplifier.................................62

Programmable Loop Compensation .......................62

Checking Transient Response.................................62

PolyPhase Configuration ......................................64

Connecting The USB to I2C/SMBus/PMBus Controller

to the LTM4683 In System .....................................64

LTpowerPlay: An Interactive GUI for Digital Power .65

PMBus Communication and Command Processing65

Thermal Considerations and Output Current Derating. 67

Table 13. Single Channel Output Voltage vs

Capacitor Selection, 10A to 20A Load Step with

10A/µs Slew Rate ...............................................72

Table 14. Single Channel Output Voltage vs

Capacitor Selection, All Ceramic Configuration,

10A to 20A Load Step with 10A/µs Slew Rate ....73

Table 15. Dual Connected Channels Output Voltage

vs Capacitor Selection, Bulk and Ceramic Cap

Configuration, 10A to 30A Load Step with 20A/µs

Slew Rate ........................................................... 74

Table 16. Quad Connected Channels Output Voltage

vs Capacitor Selection, Bulk and Ceramic Cap

Configuration, 10A to 40A Load Step with 15A/µs

Slew Rate ...........................................................75

EMI Performance....................................................76

Safety Considerations.............................................76

Layout Checklist/Example ......................................76

Typical Applications ......................................78

PMBus Command Details ...............................83

Addressing and Write Protect.................................83

General Configuration Commands..........................85

On/Off/Margin ........................................................86

PWM Configuration ................................................88

Voltage....................................................................91

Input Voltage and Limits.......................................91

Output Voltage and Limits ....................................92

Output Current and Limits ......................................95

Input Current and Limits.......................................97

Temperature............................................................98

Power Stage DCR Temperature Calibration...........98

Power Stage Temperature Limits..........................98

Timing ....................................................................99

Timing—On Sequence/Ramp...............................99

Timing—Off Sequence/Ramp ............................ 100

Precondition for Restart ..................................... 101

Fault Response ..................................................... 101

Fault Responses All Faults.................................. 101

Fault Responses Input Voltage ........................... 102

Fault Responses Output Voltage......................... 102

Fault Responses Output Current......................... 105

Fault Responses IC Temperature ........................ 106

Fault Responses External Temperature............... 107

Fault Sharing......................................................... 108

Fault Sharing Propagation .................................. 108

Fault Sharing Response...................................... 110

Scratchpad ........................................................... 110

Identification..........................................................111

Fault Warning and Status...................................... 112

Telemetry.............................................................. 118

NVM Memory Commands .................................... 122

Store/Restore ..................................................... 122

Fault Logging...................................................... 123

Block Memory Write/Read.................................. 127

Package Description ................................... 128

Table 25. LTM4683 BGA Pinout.......................... 128

Package Description ................................... 129

Revision History ........................................ 131

Package Photos ......................................... 132

Design Resources ...................................... 132

Related Parts ............................................ 132

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