BQ24085 Datasheet, PDF (6/34 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
DEVICE INFORMATION
PIN ASSIGNMENT
VSS STAT 2 STAT 1 TMR
IN
5
4
3
2
1
VSS STAT 2 STAT 1 TMR
IN
5
4
3
2
1
VSS STAT 2 STAT 1 TMR
IN
5
4
3
2
1
bq24086 DRC
bq24088 DRC
(TOP VIEW)
bq24085 DRC
(TOP VIEW)
bq24087 DRC
(TOP VIEW)
NAME
IN
TMR
STAT1
STAT2
VSS
ISET
PG
CE
TE
TS
BAT
OUT
Exposed
Thermal
Pad
6
7
ISET PG
8
9
10
TS BAT OUT
6
7
ISET PG
8
9
10
CE BAT OUT
6
7
ISET CE
8
9
10
TE
BAT
OUT
TERMINAL FUNCTIONS, REQUIRED COMPONENTS
TERMINAL NO.
bq24086/8 bq24085
1
1
bq24087
1
2
2
2
3
3
3
4
4
4
5
5
5
6
6
6
7
7
—
—
8
7
—
—
8
8
—
—
9
9
9
10
10
10
Pad
Pad
Pad
I/O
DESCRIPTION AND REQUIRED COMPONENTS
I
Charge Input Voltage and internal supply. Connect a 1- µF (minimum)
capacitor from IN to VSS. C_IN ≥ C_OUT
I
Safety Timer Program Input, timer disabled if floating. Connect a resistor to
VSS pin to program safety timer timeout value
O Charge Status Output 1 (open-collector, seeTable 3)
O Charge Status Output 2 (open-collector, see Table 3)
I Ground
Charge current set point, resistor connected from ISET to VSS sets charge
O current value. Connect a 0.1-µF capacitor from BAT to ISET for I_(OUT) < 200
mA.
O Power Good status output (open-collector), active low
I Charge enable Input. CE = LO enables charger. CE = HI disables charger.
Termination enable Input. TE = LO enables termination detection and battery
I absent detection. TE = HI disables termination detection and battery absent
detection.
I
Temperature Sense Input, connect to battery pack thermistor. Connect an
external resistive divider to program temperature thresholds.
I
Battery Voltage Sense Input. Connect to the battery positive terminal.
Connect a 390-Ω resistor from BAT to OUT for I_(OUT) < 200 mA..
O
Charge current output. Connect to the battery positive terminal. Connect a 1-
µF (minimum) capacitor from OUT to VSS.
There is an internal electrical connection between the exposed thermal pad
and Vss pin of the IC. The exposed thermal pad must be connected to the
same potential as the VSS pin on the printed circuit board. Do not use the
thermal pad as the primary ground input for the IC. VSS pin must be
connected to ground at all times.
6
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