Datasheet

LP3947
www.ti.com SNVS298B –NOVEMBER 2004–REVISED APRIL 2013
ELECTRICAL CHARACTERISTICS (continued)
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
I
EOC
End of Charge Current Accuracy 100 mA to 450 mA, 0.1C EOC Only
(4)
−10 +10 mA
500 mA to 750 mA, All EOC Points −20 +20 %
V
BATT
Battery Regulation Voltage (For 4.1V T
J
= 0°C to +85°C 4.1 4.059 4.141
Cell)
T
J
= −40°C to +85°C 4.1 4.038 4.162
V
Battery Regulation Voltage (For 4.2V T
J
= 0°C to +85°C 4.1 4.158 4.242
Cell)
T
J
= −40°C to +85°C 4.2 4.137 4.263
V
CHG-Q
Full Charge Qualification Threshold V
BATT
Rising, Transition from Pre-Charge
3.0 V
to Full Current
V
BAT-RST
Restart Threshold Voltage V
BATT
Falling, Transition from EOC, to Pre-
3.9 3.77 4.02
(For 4.1V Cell) Qualification State
V
Restart Threshold Voltage V
BATT
Falling, Transition from EOC, to Pre-
4.00 3.86 4.12
(For 4.2V Cell) Qualification State
R
SENSE
Internal Current Sense Resistance
(2)
120 mΩ
Internal Current Sense Resistor Load
1.2 A
Current
ICHG
MON
Diff-Amp Output I
CHG
= 50 mA 0.583
I
CHG
= 100 mA 0.663 V
I
CHG
= 750 mA 1.790
t
OUT
Charger Time Out T
J
= 0°C to 85°C 5.625 4.78 6.42
Hrs
T
J
= −40°C to +85°C 5.625 4.5 6.75
V
OL
Low Level Output Voltage EOC, CHG Pins each at 9 mA 100 mV
TEMPERATURE SENSE COMPARATORS
V
UTLO
Low Voltage Threshold Voltage at Ts Pin, Rising 2.427
V
Voltage at Ts Pin, Falling 2.369
V
OTLO
High Voltage Threshold Voltage at Ts Pin, Rising 1.470
V
Voltage at Ts Pin, Falling 1.390
V
LDO
LDO Mode Voltage Threshold Voltage at Ts Pin, % of V
T
97 %
V
T
Voltage Output 2.787 V
LDO MODE (Ts = HIGH)
V
OUT
Output Voltage Regulation I
LOAD
= 50 mA 4.10
V
I
LOAD
= 750 mA 4.06
LOGIC LEVELS
V
IL
Low Level Input Voltage EN, ISEL, MODE 0.4 V
V
IH
High Level Input Voltage EN, ISEL, MODE 2.0 V
I
IL
Input Current EN, ISEL = LOW −10 +10 µA
MODE = LOW −5 +5 µA
I
IH
Input Current EN, ISEL, MODE = HIGH −5 +5 µA
(4) The ±10 mA limits apply to all charge currents from 100 mA to 450 mA, to 0.1C End Of Charge (EOC). The limits increase proportionally
with higher EOC points. For example, at 0.2C, the End Of Charge current accuracy becomes ±20 mA.
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