BQ24100 Datasheet, PDF (7/26 Pages) Texas Instruments – SYNCHRONOUS SWITCHMODE, LI-ION AND LI-POL CHARGE MANAGEMENT IC WITH INTEGRATED POWERFETS

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bq24100, bq24103
bq24105, bq24108
bq24113, bq24115
SLUS606C – JUNE 2004 – REVISED SEPTEMBER 2005
NAME
CELLS
CMODE
FB
IN
ISET1
ISET2
N/C
OUT
PG
PGND
SNS
STAT1
STAT2
TS
TTC
VCC
VSS
VTSB
Exposed
Thermal
Pad
bq24100,
bq24108
3, 4
8
9
13
1
20
5
17,18
15
2
19
12
7
6
10
11
Pad
TERMINAL FUNCTIONS (continued)
TERMINAL
I/O
bq24103 bq24105 bq24113 bq24115
DESCRIPTION
13
3, 4
8
9
1
20
5
17,18
15
2
19
12
7
6
10
11
Pad
13
3, 4
8
9
1
20
5
17,18
15
2
19
12
7
6
10
11
Pad
13
7
3, 4
8
9
19
1
20
5
17,18
15
2
12
6
10
11
Pad
7
13
3, 4
8
9
19
1
20
5
17, 18
15
2
12
6
10
11
Pad
Available on parts with fixed output voltage. Ground or float for single-cell
I operation (4.2 V). For two-cell operation (8.4 V) pull up this pin with a resistor
to V_CC.
I
Charge mode selection: low for precharge as set by ISET2 pin and high (pull
up to VTSB or <7 V) for fast charge as set by ISET1.
Output voltage analog feedback adjustment. Connect the output of a resistive
I voltage divider powered from the battery terminals to this node to adjust the
output battery voltage regulation.
I Charger input voltage.
I/O
Charger current set point 1 (fast charge). Use a resistor to ground to set this
value.
Charge current set point 2 (precharge and termination), set by a resistor
I/O
connected to ground. A low-level CMODE signal selects the ISET2 charge
rate, but if the battery voltage reaches the regulation set point, bqSWITCHER
changes to voltage regulation regardless of CMODE input.
- No connection. This pin must be left floating in the application.
O
Charge current output inductor connection.
O
Power-good status output (open drain). The transistor turns on when a valid
O V_CC is detected. It is turned off in the sleep mode. PG can be used to drive a
LED or communicate with a host processor.
Power ground input
Charge current-sense input. Battery current is sensed via the voltage drop
I developed on this pin by an external sense resistor in series with the battery
pack. A 0.1-µF capacitor to PGND is required.
Charge status 1 (open-drain output). When the transistor turns on indicates
O charge in process. When it is off and with the condition of STAT2 indicates
various charger conditions (See Table 1)
Charge status 2 (open-drain output). When the transistor turns on indicates
O charge is done. When it is off and with the condition of STAT1 indicates
various charger conditions (See Table 1)
Temperature sense input. This input monitors its voltage against an internal
I threshold to determine if charging is allowed. Use an NTC thermistor and a
voltage divider powered from VTSB to develop this voltage. (See Figure 7)
Timer and termination control. Connect a capacitor from this node to GND to
I set the bqSWITCHER timer. When this input is low, the timer and termination
detection are disabled.
I Analog device input
Analog ground input
O
TS internal bias regulator voltage. Connect capacitor (with a value between a
0.1-µF and 1-µF) between this output and VSS.
There is an internal electrical connection between the exposed thermal pad
and VSS. The exposed thermal pad must be connected to the same potential
as the VSS pin on the printed circuit board. The power pad can be used as a
star ground connection between V_SS and PGND. A common ground plane may
be used. VSS pin must be connected to ground at all times.
7