LP3947ISD-51 Datasheet, PDF (6/20 Pages) Texas Instruments – LP3947 USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC

LP3947
SNVS298B – NOVEMBER 2004 – REVISED APRIL 2013
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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. ^{(1) (2) (3)}
Symbol
Parameter
V_IL
V_IH
V_OL
V_HYS
F_CLK
t_HOLD
t_CLK-LP
t_CLK-HP
t_SU
t_DATA-HOLD
t_DATA-SU
t_SU
t_TRANS
Low Level Input Voltage
High Level Input Voltage
Low Level Output Voltage
Schmitt Trigger Input Hysteresis
Clock Frequency
Hold Time Repeated START Condition
CLK Low Period
CLK High Period
Set-Up Time Repeated START
Condition
Data Hold Time
Data Set-Up Time
Set-Up Time for STOP Condition
Maximum Pulse Width of Spikes that
must be Suppressed by the Input Filter
of both DATA & CLK Signals.
Conditions
SDA & SCL ⁽²⁾
SDA & SCL ⁽²⁾
SDA & SCL ⁽²⁾
SDA & SCL ⁽²⁾
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
Limit
Typ
Units
Min
Max
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
1.3
µs
0.6
µs
0.6
µs
300
ns
100
ns
0.6
µs
50
ns
(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.
Prequalification to Fast
Charge transition
1C
4.1V
3.9V
CC to CV transition
4.1V 0r 4.2V
3V
50 mA
RLED
GLED
Battery
Voltage
Battery
Current
End of Charge
Current
0.1C (Default)
ON
OFF
Time
OFF
ON
Figure 2. Li-Ion Charging Profile
6
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