LTM4650 datasheet(3/138 Pages) AD

3 / 138 page

LTM4664A

Rev. 0

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TABLE OF CONTENTS

Minimum On-Time Considerations .........................66

Variable Delay Time, Soft-Start and Output

Voltage Ramping ...................................................66

Digital Servo Mode ................................................66

Soft Off (Sequenced Off) .......................................67

Undervoltage Lockout ............................................68

Fault Detection and Handling .................................68

Open-Drain Pins ....................................................68

Phase-Locked Loop and Frequency

Synchronization .....................................................69

Input Current Sense Amplifier ................................70

Programmable Loop Compensation ......................70

Checking Transient Response ................................71

PolyPhase® Configuration ......................................72

Connecting the USB to I2C/SMBus/PMBus Controller

to the LTM4664A In-System ..................................72

LTpowerPlay: An Interactive GUI for Digital Power .73

PMBus Communication and

Command Processing ............................................73

Thermal Considerations and Output

Current Derating ....................................................75

Table 10 and Table 11: Output Current Derating

(Based on Demo Board) .........................................78

Dual 25A/30A PSM Applications Information–

Derating Curves...........................................81

EMI Performance ...................................................82

Safety Considerations ............................................82

Layout Checklist/Example .....................................83

Typical Applications ......................................84

PMBus Command Details ...............................90

Addressing and Write Protect.................................90

General Configuration Commands..........................92

On/Off/Margin ........................................................93

PWM Configuration ................................................95

Voltage....................................................................98

Input Voltage and Limits.........................................98

Output Voltage and Limits ......................................99

Output Current and Limits .................................... 102

Input Current and Limits ...................................... 104

Temperature.......................................................... 105

External Temperature Calibration.......................... 105

Timing .................................................................. 106

Timing—On Sequence/Ramp............................... 106

Timing—Off Sequence/Ramp .............................. 107

Precondition for Restart ....................................... 108

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

Fault Responses All Faults.................................... 108

Fault Responses Input Voltage.............................. 109

Fault Responses Output Voltage........................... 109

Fault Responses Output Current........................... 112

Fault Responses IC Temperature .......................... 113

Fault Responses External Temperature................. 114

Fault Sharing......................................................... 115

Fault Sharing Propagation .................................... 115

Fault Sharing Response........................................ 117

Scratchpad ........................................................... 117

Identification......................................................... 118

Fault Warning and Status...................................... 119

Telemetry.............................................................. 126

NVM Memory Commands .................................... 130

Store/Restore ....................................................... 130

Fault Logging........................................................ 131

Block Memory Write/Read.................................... 135

Package Description ................................... 136

Typical Applications .................................... 138

Related Parts ............................................ 138

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