MIC7401 Datasheet, PDF (67/68 Pages) Micrel Semiconductor – Configurable PMIC, Five-Channel Buck Regulator plus One-Boost with HyperLight Load®, I2C Control, and Enable

Micrel, Inc.
MIC7401
Table 33. Power-on-Reset Falling Threshold Voltage Setting Register (22’h)
Register Name
PORDN_REG
Power-on-Reset Falling Threshold
Address
0x22’h
Field
bit R/W
Default
Description
PORDN
4:0 R/W 01101 (2.6V)
See Table 28
PGOOD_MASK4 5 R/W
1
0 = Do Not Mask PGOOD4
1 = Mask PGOOD4
PGOOD_MASK5 6 R/W
1
0 = Do Not Mask PGOOD5
1 = Mask PGOOD5
PGOOD_MASK6 7 R/W
1
0 = Do Not Mask PGOOD6
1 = Mask PGOOD6
Pull-Down when Disabled Register (23’h)
This register is used to set the preference of enabling/disabling a pull-down FET when the DC-to-DC regulators are
disabled. The pull-down value for buck regulators 1 − 5 is 90Ω. The pull-down current value for the boost regulator 6 is
programmable.
Table 34. Pull-Down when Disabled Register
Register Name
PULLDN1-6_REG
Pull-Down when Disabled Register
Address
0x23’h
Field
bit R/W Default Description
PULLD1
0 R/W
Enable/Disable the Pull-Down on Regulator 1 when Power-Down
0
0 = No Pull Down
1 = Pull-Down
PULLD2
1 R/W
Enable/Disable the Pull-Down on Regulator 2 when Power-Down
0
0 = No Pull-Down
1 = Pull-Down
PULLD3
2 R/W
Enable/Disable the Pull-Down on Regulator 3 when Power-Down
0
0 = No Pull-Down
1 = Pull Down
PULLD4
3 R/W
Enable/Disable the Pull-Down on Regulator 4 when Power-Down
0
0 = No Pull-Down
1 = Pull-Down
PULLD5
4 R/W
Enable/Disable the Pull-Down on Regulator 5 when Power-Down
0
0 = No Pull-Down
1 = Pull-Down
PULLD6C
6:5 R/W
Sets Boost Pull-Down Current Level
00
00 = 148mA
01 = 111mA
10 = 74mA
11 = 37mA
PULLD6
7 R/W
Enable/Disable the Pull-Down on Regulator 6 when Power-Down
0
0 = No Pull-Down
1 = Pull-Down
March 16, 2015
67
Revision 1.0