Datasheet
LP3947
SNVS298B –NOVEMBER 2004–REVISED APRIL 2013
www.ti.com
RECOMMENDED OPERATING CONDITIONS
(1) (2)
CHG-IN 0.3V to 6.5V
EN, ISEL, MODE, SCL, SDA, V
T
(3)
0V to 6V
Junction Temperature −40°C to +125°C
Operating Temperature −40°C to +85°C
Thermal Resistance θ
JA
37°C/W
Maximum Power Dissipation
(4)
1.21W
(1) 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.
(2) All voltages are with respect to the potential at the GND pin.
(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) Like the Absolute Maximum power dissipation, the maximum power dissipation for operation depends on the ambient temperature. The
1.21W rating appearing under Operating Ratings results from substituting the maximum junction temperature for operation, 125°C, for
T
J
, 80°C for T
A
, and 37°C/W for θ
JA
into (1) above. More power can be dissipated at ambient temperatures below 80°C. Less power can
be dissipated at ambient temperatures above 80°C. The maximum power dissipation for operation 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.
ELECTRICAL CHARACTERISTICS
Unless otherwise noted, V
CHG-IN
= 5V, V
BATT
= 4V, C
CHG-IN
= 1 µF, C
BATT
= 10 µF. 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, T
J
= −40°C to +85°C.
(1) (2) (3)
Limit
Symbol Parameter Conditions Typ Units
Min Max
V
CC
SUPPLY
V
CHG-IN
Input Voltage Range 4.5 6
V
V
USB
4.3 6
I
CC
Quiescent Current V
CHG-IN
≤ 4V 2 20
µA
EOC = Low, adaptor connected, V
BATT
=
50 150
4.1V
V
OK-TSHD
Adaptor OK Trip Point (CHG-IN) V
CHG-IN
–V
BATT
(Rising) 60 mV
V
CHG-IN
–V
BATT
(Falling) 50 mV
V
UVLO-TSHD
Under Voltage Lock-Out Trip Point V
CHG-IN
(Rising) 3.95 3.6 4.3 V
V
CHG-IN
(Falling) 3.75 3.4 4.1 V
V
OVLO-TSHD
Over Voltage Lock-Out Trip Point V
CHG-IN
(Rising) 5.9
V
V
CHG-IN
(Falling) 5.7
Thermal Shutdown Temperature
(2)
160
°C
Thermal Shutdown Hysteresis 20
BATTERY CHARGER
I
CHG
Fast Charge Current Range ISEL = High, In USB Mode 100
ISEL = Low, In USB Mode 500 mA
In AC Adaptor Mode 100 750
Fast Charge Current Accuracy I
CHARGE
= 100 mA or 150 mA −20 +20 mA
I
CHARGE
≥ 200 mA −10 +10 %
I
PRE-CHG
Pre-Charge Current V
BATT
= 2V 45 70 mA
(1) All limits are specified. All electrical characteristics having room-temperature limits are tested during production with T
J
= 25°C. All hot
and cold limits are specified by correlating the electrical characteristics to process and temperature variations and applying statistical
process control.
(2) Specified by design.
(3) LP3947 is not intended as a Li-Ion battery protection device, any battery used in this application should have an adequate internal
protection.
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