BQ24085 Datasheet, PDF (12/34 Pages) Texas Instruments – 750 mA SINGLE-CHIP Li-Ion/Li-Pol CHARGE MANAGEMENT IC WITH THERMAL REGULATION

bq24085, bq24086
bq24087, bq24088
SLUS784B – DECEMBER 2007 – REVISED MAY 2008 .................................................................................................................................................... www.ti.com
APPLICATION CIRCUITS
The typical application diagrams shown here are configured for 400 mA fast charge current, 40 mA pre-charge
current, 5 hour safety timer and 30 min pre-charge timer.
bq24086/8
Input Power
C3
4.7 mF
R1
R2
1.5 kW 1.5 kW
1
R_{TMR 2}
49.9 kW
RED
3
IN
TMR
STAT 1
OUT ¹⁰
BAT ⁹
TS ⁸
GREEN
4 _{STAT 2}
5
Vss
7
PG
ISET ⁶
R ISET
1.13 kW
bq24085
Input Power
C3
4.7 mF
R1
1.5 kW
R2
1.5 kW
RED
1
RTMR
2
49.9 kW
3
IN
TMR
STAT 1
OUT ¹⁰
9
BAT
8
CE
GREEN
4
STAT 2
5
Vss
7
PG
ISET ⁶
RSET
1.13 kW
R8
C2
2.2 mF
Li-Ion or Li-Pol
Battery Pack
Pack+
+
Pack-
RT1
10 kW
TEMP
RT2
33.2 kW
Power
Good
Li-Ion or Li-Pol
Battery Pack
Pack+
C2
1 mF
+
Pack-
Charge Enable
and Power Good
bq24087
Input Power
C3
4.7 mF
R1
1.5 kW
R2
1.5 kW
RED
1
RTMR
2
49.9 kW
3
IN
TMR
STAT 1
OUT ¹⁰
9
BAT
8
TE
GREEN
4
STAT 2
5
Vss
7
CE
ISET ⁶
Li-Ion or Li-Pol
Battery Pack
Pack+
C2
1 mF
+
Pack-
RSET
1.13 kW
Charge and
Termination Enable
Figure 13. Application Circuits
OPERATING MODES
Power Down
The bq24085/6/7/8 family is in a power-down mode when the input power voltage (IN) is below the power-down
threshold V_(PDWN). During the power down mode all IC functions are off, and the host commands at the control
pins are not interpreted. The integrated power mosfet connected between IN and OUT pins is off, the status
output pins STAT1 and STAT2 are set to high impedance mode and PG output is set to the high impedance
state.
12
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