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Linear ADI Power LTM4681
Analog Devices Linear ADI Power LTM4681 Manuals
Manuals and User Guides for Analog Devices Linear ADI Power LTM4681. We have
1
Analog Devices Linear ADI Power LTM4681 manual available for free PDF download: Manual
Analog Devices Linear ADI Power LTM4681 Manual (134 pages)
Quad 31.25A or Single 125A µModule Regulator with Digital Power System Management
Brand:
Analog Devices
| Category:
Controller
| Size: 4.44 MB
Table of Contents
Features
1
Applications
1
Typical Application
1
Description
1
Table of Contents
2
Absolute Maximum Ratings
4
Order Information
4
Pin Configuration
4
Electrical Characteristics
5
Typical Performance Characteristics
12
Pin Functions
16
Simplified Block Diagram
24
Decoupling Requirements
24
Functional Diagram
25
Test Circuits
26
Operation
28
Power Module Introduction
28
Power Module Overview, Major Features
28
EEPROM with ECC
29
Power-Up and Initialization
30
Soft-Start
31
Time-Based Sequencing
31
Voltage-Based Sequencing
32
Shutdown
32
Light-Load Current Operation
32
Switching Frequency and Phase
33
PWM Loop Compensation
33
Output Voltage Sensing
33
INTV CC /VBIAS Power
33
Output Current Sensing and Sub Milliohm DCR Current Sensing
34
Input Current Sensing
34
Polyphase Load Sharing
34
Internal Temperature Sense
35
RCONFIG (Resistor Configuration) Pins
35
CONFIG_ALL[6] = 1B) Top Resistor = 14.3K
36
Or 2,3 Channels, Set Top Resistor to 14.3K
37
MFR_CONFIG_ALL[6] Setting)
38
Fault Detection and Handling
38
Status Registers and ALERT Masking
39
Mapping Faults to Faultn Pins
41
Power Good Pins
41
CRC Protection
41
Serial Interface
41
Communication Protection
41
Device Addressing
41
Responses to VOUT and IIN /IOUT Faults
42
Output Overvoltage Fault Response
42
Output Undervoltage Response
43
Peak Output Overcurrent Fault Response
43
Responses to Timing Faults
43
Responses to V in OV Faults
43
Responses to OT/UT Faults
43
Internal Overtemperature Fault Response
43
Overtemperature and Undertemperature Fault Response
44
Responses to Input Overcurrent and Output Undercurrent Faults
44
Responses to External Faults
44
Fault Logging
44
Bus Timeout Protection
44
Similarity between Pmbus, Smbus and I 2 C 2-Wire Interface
45
Pmbus Serial Digital Interface
45
Pmbus Command Summary
50
Pmbus Commands
50
Applications Information
56
Input Capacitors
56
Output Capacitors
56
Light Load Current Operation
56
Switching Frequency and Phase
57
Output Current Limit Programming
58
Minimum On-Time Considerations
59
Variable Delay Time, Soft-Start and Output Voltage Ramping
59
Digital Servo Mode
59
Soft off (Sequenced Off)
60
Undervoltage Lockout
61
Fault Detection and Handling
61
Open-Drain Pins
61
Phase-Locked Loop and Frequency Synchronization
62
Input Current Sense Amplifier
63
Programmable Loop Compensation
63
Checking Transient Response
64
Polyphase Configuration
65
Controller to the Ltm4681 in System
65
Ltpowerplay: an Interactive GUI for Digital Power
66
Pmbus Communication and Command Processing
66
Thermal Considerations and Output Current Derating
68
Derating Curves
76
EMI Performance
78
Safety Considerations
78
Layout Checklist/Example
78
Typical Applications
80
Pmbus Command Details
85
Addressing and Write Protect
85
General Configuration Commands
87
On/Off/Margin
88
PWM Configuration
90
Voltage
93
Input Voltage and Limits
93
Output Voltage and Limits
94
Output Current and Limits
97
Input Current and Limits
99
Temperature
100
Power Stage DCR Temperature Calibration
100
Power Stage Temperature Limits
100
Timing
101
Timing-On Sequence/Ramp
101
Timing-Off Sequence/Ramp
102
Precondition for Restart
103
Fault Response
103
Fault Responses All Faults
103
Fault Responses Input Voltage
104
Fault Responses Output Voltage
104
Fault Responses Output Current
107
Fault Responses IC Temperature
108
Fault Responses External Temperature
109
Fault Sharing
110
Fault Sharing Propagation
110
Fault Sharing Response
112
Scratchpad
112
Identification
113
Fault Warning and Status
114
Telemetry
120
NVM Memory Commands
124
Store/Restore
124
Fault Logging
125
Block Memory Write/Read
129
Package Description
130
Revision History
133
Package Photos
134
Design Resources
134
Related Parts
134
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