LP3971SQ-B410EV National Semiconductor, LP3971SQ-B410EV Datasheet - Page 39

• 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
V
Note: ** denotes EPROM programmable registers for default value.
V
Serial interface register selection codes (Bold face voltages are default values).
Register Programming Examples
Example 1. Setting register 8h'12 value to 8h'3E' will enable LDOs 1–5.
Example 2. Setting register 8h'39 to 8h'CC' will set LDOs 1 and 2 to 3.0V. These voltages will appear at the LDO outputs if the
corresponding LDO has been enabled. Programming a voltage value to a LDO, which is off, will affect the LDO output voltage after
the LDO is enabled. Enabling and programming the output voltage are separate operations.
Bit
7:5
4:0
CC
CC
_LDO5 VOLTAGE CONTROL REGISTER (L5VCR) 8H'3B
_LDO5 VOLTAGE CONTROL REGISTER (L5VCR) 8H'3B DEFINITIONS
Access
R/W
Bit
—
Name
B1OV
—
7
0
Reserved
Reserved
6
0
Data Code
5
0
4h'2
4h'A
4h'B
4h'C
4h'D
4h'E
4h'F
4h'0
4h'1
4h'3
4h'4
4h'5
4h'6
4h'7
4h'8
4h'9
4
0
0**
Output Voltage
3
39
1.00
1.05
1.10
1.15
1.20
1.25
1.30
1.35
1.40
1.50
1.80
1.90
2.50
2.80
3.00
3.30
LDO 5 Output Voltage (L5OV)**
Description
0**
2
1**
1
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0**
0