LP3947ISD-51 Datasheet, PDF (5/20 Pages) Texas Instruments – LP3947 USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC

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)}
Symbol
I_EOC
Parameter
End of Charge Current Accuracy
Conditions
100 mA to 450 mA, 0.1C EOC Only ⁽⁴⁾
500 mA to 750 mA, All EOC Points
Limit
Typ
Units
Min
Max
−10
+10
mA
−20
+20
%
V_BATT
V_CHG-Q
Battery Regulation Voltage (For 4.1V
Cell)
Battery Regulation Voltage (For 4.2V
Cell)
T_J = 0°C to +85°C
T_J = −40°C to +85°C
T_J = 0°C to +85°C
T_J = −40°C to +85°C
4.1
4.059 4.141
4.1
4.038 4.162
V
4.1
4.158 4.242
4.2
4.137 4.263
Full Charge Qualification Threshold
V_BATT Rising, Transition from Pre-Charge
to Full Current
3.0
V
V_BAT-RST
R_SENSE
Restart Threshold Voltage
(For 4.1V Cell)
V_BATT Falling, Transition from EOC, to Pre-
Qualification State
3.9
3.77
Restart Threshold Voltage
(For 4.2V Cell)
V_BATT Falling, Transition from EOC, to Pre-
Qualification State
4.00
3.86
Internal Current Sense Resistance
(2)
120
Internal Current Sense Resistor Load
Current
4.02
V
4.12
mΩ
1.2
A
ICHG_MON
Diff-Amp Output
t_OUT
Charger Time Out
V_OL
Low Level Output Voltage
TEMPERATURE SENSE COMPARATORS
I_CHG = 50 mA
I_CHG = 100 mA
I_CHG = 750 mA
T_J = 0°C to 85°C
T_J = −40°C to +85°C
EOC, CHG Pins each at 9 mA
0.583
0.663
1.790
5.625 4.78
5.625
4.5
100
V
6.42
Hrs
6.75
mV
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
LOGIC LEVELS
I_LOAD = 50 mA
I_LOAD = 750 mA
4.10
V
4.06
V_IL
Low Level Input Voltage
V_IH
High Level Input Voltage
I_IL
Input Current
EN, ISEL, MODE
EN, ISEL, MODE
EN, ISEL = LOW
MODE = LOW
0.4
V
2.0
V
−10
+10
µA
−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.
Copyright © 2004–2013, Texas Instruments Incorporated
Product Folder Links: LP3947
Submit Documentation Feedback
5