MIC7401 Datasheet, PDF (4/68 Pages) Micrel Semiconductor – Configurable PMIC, Five-Channel Buck Regulator plus One-Boost with HyperLight Load®, I2C Control, and Enable

Micrel, Inc.
MIC7401
Table of Contents (Continued)
Timing Diagrams ................................................................................................................................................................... 35
Normal Power-Up Sequence for Outputs .......................................................................................................................... 35
Standby (STBY) Pin (Wake-Up)............................................................................................................................................ 36
Evaluation Board Schematic ................................................................................................................................................. 37
Bill of Materials ...................................................................................................................................................................... 38
PCB Layout Guidelines ......................................................................................................................................................... 39
General .............................................................................................................................................................................. 39
IC ....................................................................................................................................................................................... 39
Input Capacitor .................................................................................................................................................................. 39
Inductor .............................................................................................................................................................................. 39
Output Capacitor ............................................................................................................................................................... 39
Proper Termination of Unused Pins ...................................................................................................................................... 40
PCB Layout Recommendations ............................................................................................................................................ 41
Package Information⁽¹⁷⁾ and Recommended Landing Pattern .............................................................................................. 45
Via Layout Design and Layout Constraints ........................................................................................................................... 46
Appendix A ............................................................................................................................................................................ 47
I²C Control Register........................................................................................................................................................... 47
Serial Port Operation ......................................................................................................................................................... 47
External Host Interface .................................................................................................................................................. 47
Special Host I²C Commands ......................................................................................................................................... 48
Special Keys .................................................................................................................................................................. 48
Appendix B ............................................................................................................................................................................ 49
Register Settings Descriptions .......................................................................................................................................... 49
Power Good Register (00’h) .......................................................................................................................................... 49
EEPROM-Ready Register (01’h) ................................................................................................................................... 50
Fault Registers (02’h)..................................................................................................................................................... 51
Standby Register (03’h)..................................................................................................................................................... 52
Enable/Disable Register (04’h).......................................................................................................................................... 53
Regulator Output Voltage Setting NORMAL Mode (05’h − 09’h) ...................................................................................... 54
Boost Regulator Output Voltage Setting NORMAL Mode (0A’h) ...................................................................................... 55
Regulator Voltage Setting STBY Mode (0B’h – 0F’h) ....................................................................................................... 56
Boost Regulator Output Voltage Setting STBY Mode (10’h)............................................................................................. 57
Sequence Register (11’h) .................................................................................................................................................. 58
Delay Register (17’h) ......................................................................................................................................................... 61
Soft-Start Registers (18’h − 1A’h)...................................................................................................................................... 62
Current-Limit (Normal Mode) Registers (1B’h − 1D’h) ...................................................................................................... 63
Current-Limit (STBY Mode) Registers (1E − 20’h) ............................................................................................................ 65
Power-on-Reset (POR) Threshold Voltage Setting Register (21’h and 22’h) ................................................................... 66
Pull-Down when Disabled Register (23’h) ......................................................................................................................... 67
March 16, 2015
4
Revision 1.0