Datasheet

1C
4.1V
3.9V
3V
Prequalification to Fast
Charge transition
Battery
Voltage
Battery
Current
CC to CV transition
4.1V 0r 4.2V
Time
ON
OFF ON
OFF
50 mA
GLED
RLED
End of Charge
Current
0.1C (Default)
Battery Voltage
Charge Current
LP3947
SNVS298B –NOVEMBER 2004–REVISED APRIL 2013 www.ti.com
ELECTRICAL CHARACTERISTICS, I
2
C 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.
(1) (2) (3)
Limit
Symbol Parameter Conditions Typ Units
Min Max
V
IL
Low Level Input Voltage SDA & SCL
(2)
0.4 0.3 V
DD
V
V
IH
High Level Input Voltage SDA & SCL
(2)
0.7 V
DD
V
DD
+0.5 V
V
OL
Low Level Output Voltage SDA & SCL
(2)
0 0.2 V
DD
V
V
HYS
Schmitt Trigger Input Hysteresis SDA & SCL
(2)
0.1 V
DD
V
F
CLK
Clock Frequency
(2)
400 kHz
t
HOLD
Hold Time Repeated START Condition
(2)
0.6 µs
t
CLK-LP
CLK Low Period
(2)
1.3 µs
t
CLK-HP
CLK High Period
(2)
0.6 µs
t
SU
Set-Up Time Repeated START
(2)
0.6 µs
Condition
t
DATA-HOLD
Data Hold Time
(2)
300 ns
t
DATA-SU
Data Set-Up Time
(2)
100 ns
t
SU
Set-Up Time for STOP Condition
(2)
0.6 µs
t
TRANS
Maximum Pulse Width of Spikes that
(2)
must be Suppressed by the Input Filter 50 ns
of both DATA & CLK Signals.
(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.
Figure 2. Li-Ion Charging Profile
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