Datasheet
Charger
control
TS
CHG-IN
EN
SCL
SDA
Mode
+
-
R
SENSE
Vref
+
-
-
+
+
-
ISEL
CHG
BATT
Diff Amp
V
T
EOC
I
2
C and Digital
ON/OFF
Control
LED
Driver
Power
FET
Control
LDO
Mode
UTLO
OTLO
LDO
Error
Amp
LP3947
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SNVS298B –NOVEMBER 2004–REVISED APRIL 2013
LP3947 FUNCTIONAL BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
(1) (2)
If Military/Aerospace specified devices are required, contact the Texas Instruments Semiconductor Sales Office/
Distributors for availability and specifications.
CHG-IN −0.3V to +6.5V
All pins except GND and CHG-IN
(3)
−0.3V to +6V
Junction Temperature 150°C
Storage Temperature −40°C to +150°C
Power Dissipation
(4)
1.89W
ESD
(5)
Human Body Model 2 kV
Machine Model 200V
(1) All voltages are with respect to the potential at the GND pin.
(2) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which
operation of the device is ensured. Operating Ratings do not imply verified performance limits. For specified performance limits and
associated test conditions, see the Electrical Characteristics tables.
(3) Caution must be taken to avoid raising pins EN and V
T
0.3V higher than V
CHG-IN
and raising pins ISEL, MODE, SCL and SDA 0.3V
higher than V
BATT
.
(4) The Absolute Maximum power dissipation depends on the ambient temperature and can be calculated using the formula
MM P = (T
J
– T
A
)θ
JA
,
where T
J
is the junction temperature, T
A
is the ambient temperature, and θ
JA
is the junction-to-ambient thermal resistance. The 1.89W
rating appearing under Absolute Maximum Ratings results from substituting the Absolute Maximum junction temperature, 150°C, for T
J
,
80°C for T
A
, and 37°C/W for θ
JA
. More power can be dissipated safely at ambient temperatures below 80°C. Less power can be
dissipated safely at ambient temperatures above 80°C. The Absolute Maximum power dissipation can be increased by 27 mW for each
degree below 80°C, and it must be de-rated by 27 mW for each degree above 80°C.
(5) The human-body model is used. The human-body model is 100 pF discharged through 1.5 kΩ.
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