LTM4682 datasheet(3/130 Pages) AD

3 / 130 page

LTM4682

Rev. A

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TABLE OF CONTENTS

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 .....................................................60

Phase-Locked Loop and Frequency Synchronization .. 61

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

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

Checking Transient Response.................................63

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

Connecting The USB to I2C/SMBus/PMBus Controller

to the LTM4682 In System .....................................64

LTpowerPlay: An Interactive GUI for Digital Power .65

PMBus Communication and Command Processing65

Thermal Considerations and Output Current Derating. 67

Table 10 through Table 12: Output Current Derating........71

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...........................72

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................................................................73

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................................................................73

EMI Performance.................................................... 74

Safety Considerations............................................. 74

Layout Checklist/Example ......................................75

Typical Application .......................................76

PMBus Command Details ...............................81

Addressing and Write Protect.................................81

General Configuration Commands..........................83

On/Off/Margin ........................................................84

PWM Configuration ................................................86

Voltage....................................................................89

Input Voltage and Limits...........................................89

Output Voltage and Limits ........................................90

Output Current and Limits ......................................93

Input Current and Limits...........................................95

Temperature............................................................96

Power Stage DCR Temperature Calibration...............96

Power Stage Temperature Limits..............................96

Timing ....................................................................97

Timing—On Sequence/Ramp...................................97

Timing—Off Sequence/Ramp...................................98

Precondition for Restart ...........................................99

Fault Response .......................................................99

Fault Responses All Faults ........................................99

Fault Responses Input Voltage................................ 100

Fault Responses Output Voltage ............................. 100

Fault Responses Output Current ............................. 103

Fault Responses IC Temperature............................. 104

Fault Responses External Temperature................... 105

Fault Sharing......................................................... 106

Fault Sharing Propagation....................................... 106

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

Scratchpad ........................................................... 108

Identification......................................................... 109

Fault Warning and Status...................................... 110

Telemetry.............................................................. 116

NVM Memory Commands .................................... 120

Store/Restore ......................................................... 120

Fault Logging.......................................................... 121

Block Memory Write/Read...................................... 125

Package Description ................................... 126

Table 25. LTM4682 BGA Pinout .............................. 126

Package Description ................................... 127

Revision History ........................................ 129

Package Photos ......................................... 130

Design Resources ...................................... 130

Related Parts ............................................ 130

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