Datasheet

ADM1177 Data Sheet
Rev. C | Page 2 of 24
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 5
Thermal Characteristics .............................................................. 5
ESD Caution .................................................................................. 5
Pin Configuration and Function Descriptions ............................. 6
Typical Performance Characteristics ............................................. 7
Overview of the Hot Swap Function ............................................ 12
Undervoltage Lockout ............................................................... 12
ON Function ............................................................................... 12
TIMER Function ........................................................................ 12
GATE and TIMER Functions During a Hot Swap
Operation ..................................................................................... 13
Calculating Current Limits and Fault Current Limit Time .. 13
Initial Timing Cycle ................................................................... 13
Hot Swap Retry Cycle on the ADM1177-1 ............................. 14
Soft Start (SS Pin) ....................................................................... 14
Voltage and Current Readback ..................................................... 15
Serial Bus Interface..................................................................... 15
Identifying the ADM1177 on the I
2
C Bus ............................... 15
General I
2
C Timing .................................................................... 15
Write and Read Operations ........................................................... 17
Quick Command ........................................................................ 17
Write Command Byte ................................................................ 17
Write Extended Command Byte .............................................. 18
Read Voltage and/or Current Data Bytes ................................ 19
Applications Information .............................................................. 21
Applications Waveforms ............................................................ 21
Kelvin Sense Resistor Connection ........................................... 22
Outline Dimensions ....................................................................... 23
Ordering Guide .......................................................................... 23
REVISION HISTORY
10/12—Rev. B to Rev. C
Changes to Table 1 ............................................................................ 4
Changes to Kelvin Sense Resistor Connection Section ............. 22
Deleted Figure 49, Renumbered Sequentially............................. 22
Updated Outline Dimensions ....................................................... 23
Changes to Ordering Guide .......................................................... 23
2/08—Rev. A to Rev. B
Changed V
VCC
to V
CC
Throughout ................................................. 3
Changes to Input Current for 00 Decode, I
ADRLOW
Parameter ......... 3
Changes to Input Current for 11 Decode, I
ADRHIGH
Parameter ........ 3
Added ADC Conversion Time Parameter .................................... 4
Added Fast Overcurrent Response Time Parameter ................... 4
Added Endnote 2 and Endnote 3 ................................................... 4
Changes to Figure 14 ........................................................................ 8
Changes to Figure 15 Caption ......................................................... 8
Changes to Figure 24 ...................................................................... 10
Changes to TIMER Function Section .......................................... 12
Changes to Table 5 .......................................................................... 15
Changes to General I
2
C Timing Section...................................... 15
Changes to Quick Command Section ......................................... 17
Changes to Figure 35 ...................................................................... 17
Changes to Table 7 .......................................................................... 17
Changes to Write Extended Command Byte Section ................ 18
Changes to Figure 39 ...................................................................... 18
Changes to Table 9 and Table 11 .................................................. 18
Changes to Converting ADC Codes to Voltage and
Current Readings Section .............................................................. 19
4/07—Rev. 0 to Rev. A
Changes to GATE and TIMER Functions During
a Hot Swap Section ......................................................................... 14
Changes to Calculating Current Limits and Fault Current
Limit Time Section ......................................................................... 14
Changes to Initial Timing Cycle Section ..................................... 14
Changes to Soft Start (SS Pin) Section ........................................ 15
Changes to Table 5 .......................................................................... 16
Changes to Figure 34 and Figure 35 ............................................ 17
Changes to Figure 39 ...................................................................... 19
Changes to Figure 41 and Figure 42 ............................................ 20
Added Applications Information Heading ................................. 22
9/06—Revision 0: Initial Version