LP3971SQ-2G16/NOPB National Semiconductor, LP3971SQ-2G16/NOPB Datasheet - Page 36

• Manufacturer Part Number: LP3971SQ-2G16/NOPB
• Description: IC PMU FOR APPL PROCESSORS 40LLP
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LP3971SQ-2G16/NOPB

• Applications: Processor
• Current - Supply: 60µA
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 40-LLP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LP3971SQ-2G16; LP3971SQ-2G16; LP3971SQ-2G16TR

www.national.com
Designation
Reset Value
Designation
Reset Value
BUCK 3 VOLTAGE RAMP CONTROL REGISTER (B3RC) 8H'34
BUCK 3 VOLTAGE RAMP CONTROL REGISTER (B3RC) 8H'34 DEFINITIONS
BUCK FUNCTION REGISTER (BFR) 8H'38
BUCK FUNCTION REGISTER (BFR) 8H'38 DEFINITIONS
Bit
7:5
4:0
Bit
7:3
1
0
Access
Access
R/W
Bit
—
—
R
R
BK_SLOMOD Buck Spread Spectrum Modulation Buck 1–3
Bit
BK_SSEN
Name
B3RC
Name
SHBU
—
—
7
0
6
0
Reserved
DVM Ramp Speed
Reserved
Shut down Back up battery to prevent battery drain during shipping
0 = Back up Battery Enabled
1 = Back up Battery Disabled
0 = 10 kHz triangular wave spread spectrum modulation
1 = 2 kHz triangular wave spread spectrum modulation
Spread spectrum function Buck 1–3
0 = SS Output Disabled
1 = SS Output Enabled
Reserved
5
0
Data Code
4h'A
4h'0
4h'1
4h'2
4h'3
4h'4
4h'5
4h'6
4h'7
4h'8
4h'9
4
0
7
0
3
0
SHBU
6
0
Reserved
2
0
36
Ramp Rate
(mV/µs)
Instant
10
5
0
1
2
3
4
5
6
7
8
9
BK_SLOMOD
Description
Description
4
0
1
1
3
1
2
0
Ramp Rate
BK_SSEN
1
1
0
0
0
0