Datasheet
VREF COLD HOT
VREF VREF
HOT COLD
VREF
COLD
1 1
V RTH RTH
VT1 VT5
RT2
V V
RTH 1 RTH 1
VT5 VT1
V
1
VT1
RT1
1 1
RT2 RTH
æ ö
´ ´ ´ -
ç ÷
è ø
=
æ ö æ ö
´ - - ´ -
ç ÷ ç ÷
è ø è ø
-
=
+
bq2419x Charging Voltage
T1
T2
T5
T3
4.2V
4.05V
10
0
C
0 C
0
45
0
C
60
0
C
4.10V
VSET=1
VSET=0
bq2419x Charging Current
T1
T2
T5
T3
1I
CHG
0.5I
CHG
10
0
C
0 C
0
45
0
C
60
0
C
ISET=1
ISET=0
0.2I
CHG
bq24190, bq24192
bq24192I, bq24193
www.ti.com
SLUSAW5A –JANUARY 2012–REVISED OCTOBER 2012
JEITA Guideline Compliance (bq24193)
To improve the safety of charging Li-ion batteries, JEITA guideline was released on April 20, 2007. The guideline
emphasized the importance of avoiding a high charge current and high charge voltage at certain low and high
temperature ranges.
To initiate a charge cycle, the voltage on TS pin must be within the V
T1
to V
T5
thresholds. If TS voltage exceeds
the T1–T5 range, the controller suspends charging and waits until the battery temperature is within the T1 to T5
range. At cool temperature (T1–T2), JEITA recommends the charge current to be reduced to at least half of the
charge current or lower. At warm temperature (T3–T5), JEITA recommends charge voltage less than 4.1V.
The bq24193 provides flexibility voltage/current settings beyond the JEITA requirement. The voltage setting at
warm temperature (T3–T5) can be 4.2V or 4.05V (REG07 bit[4]). The current setting at cool temperature (T1–T2)
can be further reduced to 20% of fast charge current (REG05 bit[0]).
The resistor bias network has been updated as below.
(3)
Select 0°C to 60°C range for Li-ion or Li-polymer battery,
RTH
T1
= 27.28 kΩ
RTH
T5
= 3.02 kΩ
RT1 = 2.27 kΩ
RT2 = 6.86 kΩ
Charging Termination
The bq24190, bq24192, bq24192I, bq24193 terminates a charge cycle when the battery voltage is above
recharge threshold, and the current is below termination current. After the charging cycle is complete, the
BATFET turns off. The converter keeps running to power the system, and BATFET can turn back on to engage
supplement mode.
When termination occurs, the status register REG09[5:4] is 11, and an INT is asserted to the host. Termination is
temporarily disabled if the charger device is in input current/voltage regulation or thermal regulation. Termination
can be disabled by writing 0 to REG05[7].
Copyright © 2012, Texas Instruments Incorporated Submit Documentation Feedback 29
Product Folder Links: bq24190 bq24192 bq24192I bq24193