LP3947ISD-51 Datasheet, PDF (4/20 Pages) Texas Instruments – LP3947 USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC

LP3947
SNVS298B – NOVEMBER 2004 – REVISED APRIL 2013
www.ti.com
RECOMMENDED OPERATING CONDITIONS ^{(1) (2)}
CHG-IN
EN, ISEL, MODE, SCL, SDA, V_T(3)
Junction Temperature
Operating Temperature
Thermal Resistance θ_JA
Maximum Power Dissipation ⁽⁴⁾
0.3V to 6.5V
0V to 6V
−40°C to +125°C
−40°C to +85°C
37°C/W
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)}
Symbol
Parameter
Conditions
Limit
Typ
Units
Min
Max
V_CC SUPPLY
V_CHG-IN
Input Voltage Range
V_USB
I_CC
Quiescent Current
4.5
6
V
4.3
6
V_CHG-IN ≤ 4V
2
EOC = Low, adaptor connected, V_BATT =
4.1V
50
20
µA
150
V_OK-TSHD
Adaptor OK Trip Point (CHG-IN)
V_UVLO-TSHD Under Voltage Lock-Out Trip Point
V_OVLO-TSHD Over Voltage Lock-Out Trip Point
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
V_CHG-IN –V_BATT (Rising)
V_CHG-IN –V_BATT (Falling)
V_CHG-IN (Rising)
V_CHG-IN (Falling)
V_CHG-IN (Rising)
V_CHG-IN (Falling)
(2)
60
50
3.95
3.6
3.75
3.4
5.9
5.7
160
20
mV
mV
4.3
V
4.1
V
V
°C
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
I_PRE-CHG
Fast Charge Current Accuracy
Pre-Charge Current
I_CHARGE = 100 mA or 150 mA
I_CHARGE ≥ 200 mA
V_BATT = 2V
−20
+20
mA
−10
+10
%
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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