LP3907_14 Datasheet, PDF (34/57 Pages) Texas Instruments – Dual High-Current Step-Down DC/DC and Dual Linear Regulator with I2C-Compatible Interface

LP3907
SNVS511N – JUNE 2007 – REVISED AUGUST 2011
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BUCK AND LDO STATUS REGISTER (BKLDOSR) – 0X11
This register monitors whether the Bucks and LDOs meet the voltage output specifications.
Name
Access
Data
Reset
D7
D6
BKS_OK
LDOS_OK
R
R
0 – Buck 1-2 0 – LDO 1-2
Not Valid
Not Valid
1 – Bucks Valid 1 – LDOs Valid
0
0
D5
LDO2_OK
R
0 – LDO2 Not
Valid
1 – LDO2 Valid
0
D4
LDO1_OK
R
0 – LDO1 Not
Valid
1 – LDO1 Valid
0
D3
—
—
Reserve
d
0
D2
D1
BK2_OK
—
R
—
0 – Buck2 Not Reserve
Valid
d
1 – Buck2 Valid
0
0
D0
BK1_OK
R
0 – Buck1 Not
Valid
1 – Buck1 Valid
0
BUCK VOLTAGE CHANGE CONTROL REGISTER 1 (VCCR) – 0X20
This register selects and controls the output target voltages for the buck regulators.
Name
Access
Data
D7-6
—
—
Reserved
Reset 00
D5
B2VS
R/W
Buck2 Target Voltage
Select
0 – B2VT1
1 – B2VT2
0
D4
B2GO
R/W
Buck2 Voltage Ramp
CTRL
0 – Hold
1 – Ramp to B2VS
selection
0
D3-2
—
—
Reserved
00
D1
B1VS
R/W
Buck1 Target Voltage
Select
0 – B1VT1
1 – B1VT2
0
D0
B1GO
R/W
Buck1 Voltage Ramp
CTRL
0 – Hold
1 – Ramp to B1VS
selection
0
BUCK1 TARGET VOLTAGE 1 REGISTER (B1TV1) – 0X23
This register allows the user to program the output target voltage of Buck1.
Name
Access
Data
D7-5
—
—
Reserved
5’h00
5’h01
5’h02
5’h03
5’h04
5’h05
5’h06
5’h07
5’h08
5’h09
5’h0A
5’h0B
5’h0C
5’h0D
5’h0E
5’h0F
5’h10
5’h11
5’h12
5’h13
D4-0
BK1_VOUT1
R/W
Buck1 Output Voltage (V)
Ext Ctrl
0.80
0.85
0.90
0.95
1.00
1.05
1.10
1.15
1.20
1.25
1.30
1.35
1.40
1.45
1.50
1.55
1.60
1.65
1.70
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