BQ24004_12 Datasheet, PDF (10/27 Pages) Texas Instruments – TWO-CELL Li-ION CHARGE MANAGEMENT IC

bq24004
bq24005
bq24006
SLUS476F – DECEMBER 2000 – REVISED MAY 2012
APPLICATION INFORMATION
DC+
V_CC
C1
10 µF
R1
0.1 Ω
V_CC
+
DC-
C2
0.1 µF
U1
1
N/C
20
N/C
2
IN
19
OUT
3
IN
18
OUT
4
VCC
17
VSENSE
5
ISNS
16
AGND
6
N/C
15
STAT2
7
14
APG/THM STAT1
8
EN
13
TMR SEL
9
VSEL
12
CR
10
GND
11
N/C
C3
0.22 µF
bq24005PWP
R2
18.7 kΩ
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PACK+
+
-
PACK-
C4
1 µF
V_CC
TEMP
Battery
Pack
R4
500 Ω
D1
R5
500 Ω
D2
R3
95.3 kΩ
Figure 13. Li-ION/Li-POL Charger
• If the TMR SEL pin is left floating (3 HR time), a 10-pF capacitor should be installed between TMR SEL and
CR.
• If a micro process is monitoring the STAT pins, it may be necessary to add some hysteresis into the feedback
to prevent the STAT pins from cycling while crossing the taper detect threshold (usually less than one half
second). See SLUU083 EVM or SLUU113 EVM for additional resistors used for the STAT pins.
FUNCTIONAL DESCRIPTION
The bq2400x supports a precision current- and voltage-regulated Li-Ion charging system suitable for cells with
either coke or graphite anodes. See Figure 14 for a typical charge profile and Figure 15 for an operational
flowchart.
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