LP3971
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
All Inputs
GND to GND SLUG
Junction Temperature (T
J-MAX
)
Storage Temperature
Power Dissipation
(T
A
= 70˚C) (Note 3)
Junction-to-Ambient Thermal
Resistance
θ
JA
Maximum Lead Temp (Soldering)
−0.3V to +6V
ESD Rating (Note 5)
Human Body Model
Machine Model
2 kV
200V
±
0.3V
150˚C
−65˚C to +150˚C
3.2W
25˚C/W
260˚C
Operating Ratings
V
IN
V
EN
Junction Temperature (T
J
)
Operating Temperature (T
A
)
Maximum Power Dissipation
(T
A
= 70˚C) (Notes 3, 4)
2.7V to 5.5V
0 to (V
IN
+ 0.3V)
−40˚C to +125˚C
−40˚C to +85˚C
2.2W
Typical values and limits appearing in normal type apply for T
J
=
25˚C. Limits appearing in
boldface
type apply over the entire junction temperature range for operation, −40˚C to +125˚C.
(Notes 2, 6)
Symbol
Parameter
Conditions
Min
2.7
1.74
Temperature
Hysteresis
**No input supply should be higher then VDDA
General Electrical Characteristics
Typ
3.6
3.6
160
20
Max
5.5
5.5
Units
V
V
˚C
V
IN
, VDDA, V
IN
Buck1, 2 and Battery Voltage
3
V
IN
LDO4, V
IN
LDO5
T
SD
Power Supply for LDO 4 and 5
Thermal Shutdown (Note 14)
Supply Specification
(Notes 2, 6)
Supply
Range (V)
LDO_RTC
LDO1
LDO2
LDO3
LDO4
LDO5
BUCK 1
BUCK 2
BUCK 3
Tracking (Note 10)
1.8 to 3.3
1.8 to 3.3
1.8 to 3.3
1.0 to 3.3
1.0 to 3.3
0.8 to 3.3
0.8 to 3.3
0.8 to 3.3
V
OUT
(Volts)
Resolution (mV)
N/A
100
100
100
50-600
50-600
50-600
50-600
50-600
I
MAX
Maximum Output
Current (mA)
30 or 10
300
150
150
150
370
1600
1600
1600
Defaults
(Notes 2, 6)
‘A’ Version
Supply
LDO_RTC
LDO1
LDO2
LDO3
LDO4
LDO5
BUCK1
BUCK2
BUCK3
(V)
2.8
1.8
1.8
3.0
3.0
1.4
1.4
3.3
1.8
Enable ‘A’
…
SYS_EN
SYS_EN
SYS_EN
SYS_EN
PWR_EN
PWR_EN
SYS_EN
SYS_EN
(V)
2.8
3.0
3.0
3.0
1.3
1.1
1.4
3.0
1.8
‘B’ Version
Enable ‘B’
…
SYS_EN
SYS_EN
SYS_EN
PWR_EN
PWR_EN
PWR_EN
SYS_EN
SYS_EN
**Version-A LDO Tracking Disabled, Version-B LDO Tracking Enabled
7
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