Table Of Contents - Analog Devices LTM4683 Manual

LTM4683

TABLE OF CONTENTS

Features ..................................................... 1
Applications ................................................ 1
Typical Application ........................................ 1
Description.................................................. 1
Absolute Maximum Ratings .............................. 4
Order Information .......................................... 4
Pin Configuration .......................................... 4
Electrical Characteristics ................................. 5
Typical Performance Characteristics .................. 12
Pin Functions .............................................. 15
Simplified Block Diagram ............................... 23
Decoupling Requirements ............................... 23
Functional Diagram ...................................... 24
Test Circuits ............................................... 25
Operation................................................... 27
Power Module Introduction .................................... 27
Power Module Major Features Overview ................ 27
EEPROM with ECC .................................................. 28
Power-Up and Initialization .....................................29
Soft-Start ................................................................30
Time-Based Sequencing .........................................30
Voltage-Based Sequencing ..................................... 31
Shutdown ............................................................... 31
Light-Load Current Operation ................................. 31
Switching Frequency and Phase ............................. 32
PWM Loop Compensation ...................................... 32
Output Voltage Sensing .......................................... 32
INTV /V Power ...............................................33
CC BIAS
Output Current Sensing and Sub Milliohm DCR
Current Sensing ......................................................33
Input Current Sensing .............................................33
PolyPhase Load Sharing .........................................34
Internal Temperature Sense ....................................34
R (Resistor Configuration) Pins ....................34
CONFIG
Table 1. VOUTn_CFG Pin Strapping Look-Up Table
for the LTM4683's Output Voltage, Coarse Setting
(Not Applicable if MFR_CONFIG_ALL[6] = 1b) Top
Resistor = 14.3k..................................................35
Table 2. VTRIMn_CFG Pin Strapping Look-Up
Table for the LTM4683's Output Voltage, Fine
Adjustment Setting (Not Applicable if MFR_
CONFIG_ALL[6] = 1b) Top Resistor = 14.3k........35
2
Table 3. FSWPH_nn_CFG Pin Strapping Look-Up
Table to Set the LTM4683's Switching Frequency
and Channel Phase-Interleaving Angle (Not
Applicable if MFR_CONFIG_ALL[6] = 1b), nn = 01
or 23 Channels, Set Top Resistor to 14.3k. .........36
Table 4. ASEL_nn Pin Strapping Look-Up Table
to Set the LTM4683's Subordinate Address
(Applicable Regardless of MFR_CONFIG_ALL[6]
Setting) ............................................................... 37
Table 5. LTM4683 MFR_ADDRESS Command
Examples Expressed in 7- and 8-Bit Addressing 37
Fault Detection and Handling .................................. 37
Status Registers and ALERT Masking ...................38
Figure 5. LTM4683 Status Register Summary per
Controller ............................................................39
Mapping Faults to FAULTn Pins .............................40
Power Good Pins ..................................................40
CRC Protection .....................................................40
Serial Interface .......................................................40
Communication Protection ...................................40
Device Addressing .................................................. 41
Responses to V
Output Overvoltage Fault Response ..................... 41
Output Undervoltage Response ............................ 42
Peak Output Overcurrent Fault Response ............. 42
Responses to Timing Faults .................................... 42
Responses to V
Responses to OT/UT Faults .....................................43
Internal Overtemperature Fault Response.............43
Overtemperature and Undertemperature
Fault Response ...................................................43
Responses to Input Overcurrent and Output
Undercurrent Faults ................................................43
Responses to External Faults ..................................43
Fault Logging ..........................................................43
Bus Timeout Protection ..........................................44
Similarity Between PMBus, SMBus and I
Interface .................................................................44
PMBus Serial Digital Interface ................................44
Figure 7 to Figure 24 PMBus Protocols ..................45
Table 6. Abbreviations of Supported Data Formats ... 45
Figure 6. PMBus Timing Diagram .........................45
PMBus Command Summary ............................ 49
PMBus Commands ................................................. 49
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and I /I Faults ................... 41
OUT IN OUT
OV Faults .................................... 42
IN
2
C 2-Wire
Rev. 0