BQ24450 Datasheet, PDF (5/20 Pages) Texas Instruments – INTEGRATED CHARGE CONTROLLER FOR LEAD-ACID BATTERIES

bq24450
www.ti.com ..................................................................................................................................................................................................... SLUS929 – APRIL 2009
PIN #
1
2
3
4
5
6
7
8
9
10
11
NAME
ISNS
ISNSM
ISNSP
IFB
IN
GND
PGOOD
BSTOP
STAT2
STAT1
PRE-CHG
12
CE
13
VFB
14
COMP
15
DRVE
16
DRVC
PIN FUNCTIONS
I/O
DESCRIPTION
O
Output of the current-sense comparator. Open-Collector.
I
Negative input of the current-sense comparator.
I
Positive input of the current-sense comparator.
I
Input for the current-regulating loop. External resistor between IN and IFB sets the
charging current value.
I
Supply voltage pin. Connect to external DC source.
–
Ground terminal.
O
Open-collector output, indicates supply status at IN pin. Active low.
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.
O
Open-collector status outputs. See table below.
O
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.
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.
I
Voltage feedback pin. Connect to battery through external resistive divider.
I/O
Compensation terminal for voltage loop. Connect a capacitor from this pin to GND.
O
Emitter of the internal (NPN) driver transistor.
I
Collector of the internal (NPN) driver transistor.
PINOUT
STAT1
Hi-Z
On
On
STAT2
Hi-Z
Hi-Z
On
CONDITION
Float Mode
Bulk Charge
Boost Mode
DW PACKAGE
(TOP VIEW)
ISNS 1
ISNSM 2
ISNSP 3
IFB 4
IN 5
GND 6
PGOOD 7
BSTOP 8
16 DRVC
15 DRVE
14 COMP
13 VFB
12 CE
11 PRE-CHG
10 STAT1
9 STAT2
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