LP3947 Datasheet, PDF (5/14 Pages) National Semiconductor (TI) – USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC

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 nor-
mal 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. (Notes 7, 8, 9)
Symbol
Parameter
Conditions
Limit
Typ
Units
Min
Max
BATTERY CHARGER
V_BAT-RST
Restart Threshold Voltage
(For 4.1V Cell)
Restart Threshold Voltage
(For 4.2V Cell)
V_BATT Falling, Transition from EOC,
3.9
3.77
4.02
to Pre-Qualification State
V
V_BATT Falling, Transition from EOC, _4.00
3.86
4.12
to Pre-Qualification State
R_SENSE
Internal Current Sense Resistance
Internal Current Sense Resistor
Load Current
(Note 8)
120
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
I_LOAD = 50 mA
4.10
V
I_LOAD = 750 mA
4.06
LOGIC LEVELS
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
Electrical Characteristics, I²C Interface
Unless otherwise noted, V_CHG-IN = V_DD = 5V, V_BATT = 4V. 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 +125˚C.
(Notes 7, 8, 9)
Symbol
Parameter
Conditions
Limit
Typ
Units
Min
Max
V_IL
V_IH
V_OL
V_HYS
F_CLK
t_HOLD
Low Level Input Voltage
High Level Input Voltage
Low Level Output Voltage
Schmitt Trigger Input Hysteresis
Clock Frequency
Hold Time Repeated START
Condition
SDA & SCL (Note 8)
SDA & SCL (Note 8)
SDA & SCL (Note 8)
SDA & SCL (Note 8)
(Note 8)
(Note 8)
0.4
0.3 V_DD
V
0.7 V_DD V_DD +0.5
V
0
0.2 V_DD
V
0.1 V_DD
V
400
kHz
0.6
µs
t_CLK-LP
t_CLK-HP
CLK Low Period
CLK High Period
(Note 8)
(Note 8)
1.3
µs
0.6
µs
5
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