LP3971SQ-B410EV National Semiconductor, LP3971SQ-B410EV Datasheet - Page 29

• Manufacturer Part Number: LP3971SQ-B410EV
• Description: BOARD EVALUATION LP3971SQ-B410
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LP3971SQ-B410EV

• Main Purpose: DC/DC, Step Down with LDO
• Outputs And Type: 9, Non-Isolated
• Voltage - Input: 2.7 ~ 5.5V
• Regulator Topology: Buck
• Board Type: Fully Populated
• Utilized Ic / Part: LP3971
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Output: -
• Voltage - Output: -
• Power - Output: -
• Frequency - Switching: -
• Lead Free Status / Rohs Status: Not Compliant

Designation
Reset Value
Designation
Reset Value
BUCKS OUTPUT VOLTAGE ENABLE REGISTER (BOVEN) 8H'10
Note: ** denotes EPROM programmable registers for default value.
BUCKS ENABLE REGISTER (BOVEN) 8H'10 DEFINITIONS
BUCK STATUS REGISTER (BOVSR) 8H'11
BUCK STATUS REGISTER (BOVSR) 8H'11 DEFINITIONS
Bit
Bit
6:5
7
6
5
4
3
2
1
0
7
4
3
2
1
0
Bit
Bit
Access
Access
R/W
R/W
R/W
R/W
—
—
—
—
—
—
—
R
R
R
R
Reserved
BT_OK
B2ENC
BT_OK
B3_OK
B2_OK
B1_OK
Name
Name
B3EN
B2EN
B1EN
7
0
—
—
—
—
—
—
—
7
0
Reserved
Connects Buck 2 enable to SYS_EN or PWR_EN Logic Control pin
0 = Buck 2 enable connected to PWR_EN
1 = Buck 2 enable connected to SYS_EN
Reserved
V
0 = V
1 = V
Reserved
V
0 = V
1 = V
Reserved
V
0 = V
1 = V
Buck 1–3 Supply Output Voltage Status
0 = (Buck 1–3) output voltage <90% Default value
1 = (Buck 1–3) output voltage >90% Default value
Reserved
Buck 3 Supply Output Voltage Status
0 = (Buck 3) output voltage <90% Default value
1 = (Buck 3) output voltage >90% Default value
Reserved
Buck 2 Supply Output Voltage Status
0 = (Buck 2) output voltage <90% Default value
1 = (Buck 2) output voltage >90% Default value
Reserved
Buck 1 Supply Output Voltage Status
0 = (Buck 1) output voltage <90% Default value
1 = (Buck 1) output voltage >90% Default value
CC
CC
CC
Reserved
B2ENC**
_Buck3 Supply Output Enabled
_Buck2 Supply Output Enabled
_Buck1 Supply Output Enabled
1**
CC
CC
CC
CC
CC
CC
6
6
0
_Buck3 Supply Output Disabled
_Buck3 Supply Output Enabled
_Buck2 Supply Output Disabled
_Buck2 Supply Output Enabled
_Buck1 Supply Output Disabled
_Buck1 Supply Output Enabled
Reserved
Reserved
5
0
5
0
29
B3EN
B3_OK
4
1
4
0
Description
Description
Reserved
3
0
Reserved
3
0
B2EN
2
1
B2_OK
2
0
Reserved
1
0
1
0
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B1_OK
B1EN
0
0
0
1