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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, VT(3)
Junction Temperature
Operating Temperature
Thermal Resistance θJA
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 VT 0.3V higher than VCHG-IN and raising pins ISEL, MODE, SCL and SDA 0.3V
higher than VBATT.
(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
TJ, 80°C for TA, and 37°C/W for θJA 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, VCHG-IN = 5V, VBATT = 4V, CCHG-IN = 1 µF, CBATT = 10 µF. Typical values and limits appearing in normal
type apply for TJ = 25°C. Limits appearing in boldface type apply over the entire junction temperature range for operation, TJ
= −40°C to +85°C. (1) (2) (3)
Symbol
Parameter
Conditions
Limit
Typ
Units
Min
Max
VCC SUPPLY
VCHG-IN
Input Voltage Range
VUSB
ICC
Quiescent Current
4.5
6
V
4.3
6
VCHG-IN ≤ 4V
2
EOC = Low, adaptor connected, VBATT =
4.1V
50
20
µA
150
VOK-TSHD
Adaptor OK Trip Point (CHG-IN)
VUVLO-TSHD Under Voltage Lock-Out Trip Point
VOVLO-TSHD Over Voltage Lock-Out Trip Point
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
VCHG-IN –VBATT (Rising)
VCHG-IN –VBATT (Falling)
VCHG-IN (Rising)
VCHG-IN (Falling)
VCHG-IN (Rising)
VCHG-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
ICHG
Fast Charge Current Range
ISEL = High, In USB Mode
100
ISEL = Low, In USB Mode
500
mA
In AC Adaptor Mode
100
750
IPRE-CHG
Fast Charge Current Accuracy
Pre-Charge Current
ICHARGE = 100 mA or 150 mA
ICHARGE ≥ 200 mA
VBATT = 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 TJ = 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.
4
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