BQ24105-Q1 Datasheet, PDF (6/35 Pages) Texas Instruments – SYNCHRONOUS SWITCHMODE, LI-ION AND LI-POLYMER CHARGE-MANAGEMENT IC WITH INTEGRATED POWER FETs ( bqSWITCHER™)

bq24105-Q1
SLUS953 – AUGUST 2009................................................................................................................................................................................................. www.ti.com
TERMINAL
NAME
NO.
BAT
14
CE
16
FB
IN
ISET1
ISET2
OUT
13
3, 4
8
9
1, 20
PG
PGND
SNS
5
17,18
15
STAT1
2
STAT2
19
TS
12
TTC
7
VCC
6
VSS
10
VTSB
11
Exposed
Thermal Pad
Pad
TERMINAL FUNCTIONS
I/O
DESCRIPTION
I
Battery voltage sense input. Bypass it with a 0.1 µF capacitor to PGND if there are long inductive leads
to battery.
I
Charger enable input. This active low input, if set high, suspends charge and places the device in the
low-power sleep mode. Do not pull up this input to VTSB.
I
Output voltage analog feedback adjustment. Connect the output of a resistive 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.
I/O Charge current set point 2 (precharge and termination), set by a resistor connected to ground.
O
Charge current output inductor connection. Connect a zener TVS diode between OUT pin and PGND
pin to clamp the voltage spike to protect the power MOSFETs during abnormal conditions.
O
Power-good status output (open drain). The transistor turns on when a valid 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
I
Charge current-sense input. Battery current is sensed via the voltage drop developed on this pin by an
external sense resistor in series with the battery pack. A 0.1-µF capacitor to PGND is required.
O
Charge status 1 (open-drain output). When the transistor turns on indicates charge in process. When it
is off and with the condition of STAT2 indicates various charger conditions (see Table 1).
O
Charge status 2 (open-drain output). When the transistor turns on indicates 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 threshold to determine if
I charging is allowed. Use an NTC thermistor and a voltage divider powered from VTSB to develop this
voltage (see Figure 6).
I
Timer and termination control. Connect a capacitor from this node to GND to set the bqSWITCHER
timer. When this input is low, the timer and termination detection are disabled.
I Analog device input. A 0.1-µF capacitor to VSS is required.
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.
6
Submit Documentation Feedback
Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): bq24105-Q1