Micrel, Inc.
MIC7400
Table of Contents (Continued)
PCB Layout Guidelines
General..............................................................................................................................................................................39
IC .......................................................................................................................................................................................39
Input Capacitor ..................................................................................................................................................................39
Inductor..............................................................................................................................................................................39
Output Capacitor ...............................................................................................................................................................39
Proper Termination of Unused Pins......................................................................................................................................40
PCB Layout Recommendations............................................................................................................................................41
Package Information and Recommended Landing Pattern..................................................................................................45
Appendix A............................................................................................................................................................................46
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
Revision 2.0
March 3, 2015
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