LP3971SQ-B410EV National Semiconductor, LP3971SQ-B410EV Datasheet - Page 27

• 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
BACKUP BATTERY CHARGER CONTROL REGISTER (BBCC) 8H'0B
BACKUP BATTERY CHARGER CONTROL REGISTER (BBCC) 8H'0B DEFINITIONS
Bit
5:3
1:0
7
6
2
Bit
Access
R/W
R/W
R/W
R/W
---
NBUB
BUCEN
7
0
Name
NBUB
BFLT
IBUC
---
No back-up battery default setting. Logic will not allow switch over to back-up
battery.
0 = Back up Battery Enabled
1 = Back up Battery Disabled
Reserved
nBATT_FLT monitors the battery voltage and can be set to the De-assert
voltages listed below.
Enables backup battery charger
0 = Back up Battery Charger Disabled
1 = Back up Battery Charger Enabled
Charger current setting for back-up battery
CNBFL
6
0
Data Code
3h'00
3h'01
3h'02
3h'03
3h'04
3h'05
27
Data Code
2h'01
2h'00
2h'02
2h'03
5
0
nBFLT
4
1
Description
Asserted
3
0
2.4
2.6
2.8
3.0
3.2
3.4
BUCEN
BU Charger I (µA)
2
0
260
190
325
390
De-Asserted
www.national.com
2.6
2.8
3.0
3.2
3.4
3.6
1
0
IBUC
0
1