Datasheet

16
11
15
12
14
6
10
13
98
7
4
1
2
5
3
ISNS
ISNSM
ISNSP
IFB
IN
GND
PGOOD
BSTOP
STAT2
STAT1
PRE-CHG
CE
VFB
COMP
DRVE
DRVC
bq24450
www.ti.com SLUS929C –APRIL 2009– REVISED FEBRUARY 2012
PIN FUNCTIONS
PIN
I/O DESCRIPTION
NO. NAME
1 ISNS O Output of the current-sense comparator. Open-Collector.
2 ISNSM I Negative input of the current-sense comparator.
3 ISNSP I Positive input of the current-sense comparator.
4 IFB I Input for the current-regulating loop. External resistor between IN and IFB sets the charging current value.
5 IN I Supply voltage pin. Connect to external DC source.
6 GND – Ground terminal.
7 PGOOD O Open-collector output, indicates supply status at IN pin. Active low.
8 BSTOP I Control input. Taking this pin from low to high transitions the charger from Boost Mode to Float Mode. Internally
pulled up through a 10μA current source.
9 STAT2 O
Open-collector status outputs. See table below.
10 STAT1 O
11 PRE-CHG O Can be used to trickle-charge the battery till its voltage rises to a safe value. PRE-CHG will source current as
long as the control voltage on the CE pin is below VREF. If using, connect to battery pack through external
resistor.
12 CE I Charge enable control. If the voltage on the CE pin is below VREF, the driver transistor will be off and the
PRE-CHG pin will source current.
13 VFB I Voltage feedback pin. Connect to battery through external resistive divider.
14 COMP I/O Compensation terminal for voltage loop. Connect a capacitor from this pin to GND.
15 DRVE O Emitter of the internal (NPN) driver transistor.
16 DRVC I Collector of the internal (NPN) driver transistor.
STAT1 STAT2 CONDITION
On Hi-Z Bulk Charge
PINOUT
On On Boost Mode
STAT1 STAT2 CONDITION
Hi-Z Hi-Z Float Mode
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