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LP3906 Datasheet, PDF (25/38 Pages) National Semiconductor (TI) – Dual High-Current Step-Down DC/DC and Dual Linear Regulator with I2C Compatible Interface | |||
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LP3906 Control Registers (Continued)
BUCK AND LDO OUTPUT VOLTAGE ENABLE REGISTER (BKLDOEN) â 0X10
This register controls the enables for the Bucks and LDOs.
Name
Access
Data
Reset
D7
â
â
Reserved
0
D6
LDO2EN
R/W
0 â Disable
1 â Enable
1
D5
â
â
Reserved
1
D4
LDO1EN
R/W
0 â Disable
1 â Enable
1
D3
â
â
Reserved
0
D2
BK2EN
R/W
0 â Disable
1 â Enable
1
D1
â
â
Reserved
0
D0
BK1EN
R/W
0 â Disable
1 â Enable
1
BUCK AND LDO STATUS REGISTER (BKLDOSR) â 0X11
This register monitors whether the Bucks and LDOs meet the voltage output specifications.
D7
Name BKS_OK
Access R
Data 0 â Buck 1-2
Not Valid
1 â Bucks
Valid
Reset 0
D6
LDOS_OK
R
0 â LDO 1-2
Not Valid
1 â LDOs
Valid
0
D5
D4
D3
D2
D1
D0
LDO2_OK
LDO1_OK
â
BK2_OK
â
BK1_OK
R
R
â
R
â
R
0 â LDO2 Not 0 â LDO1 Not Reserved 0 â Buck2 Not Reserved 0 â Buck1
Valid
1 â LDO2
Valid
1 â LDO1
Valid
1 â Buck2
Not Valid
1 â Buck1
Valid
Valid
Valid
Valid
0
0
0
0
0
0
BUCK VOLTAGE CHANGE CONTROL REGISTER 1 (VCCR) â 0X20
This register selects and controls the output target voltages for the buck regulators.
D7-6
Name â
Access â
Data Reserved
Reset 00
D5
D4
D3-2
B2VS
B2GO
â
R/W
R/W
â
Buck2 Target Voltage Buck2 Voltage Ramp Reserved
Select
CTRL
0 â B2VT1
1 â B2VT2
0 â Hold
1 â Ramp to B2VS
selection
0
0
00
D1
D0
B1VS
B1GO
R/W
R/W
Buck1 Target Voltage Buck1 Voltage Ramp
Select
CTRL
0 â B1VT1
1 â B1VT2
0 â Hold
1 â Ramp to B1VS
selection
0
0
25
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