CHARGE CONTROLLER. BQ24450 Datasheet

BQ24450 CONTROLLER. Datasheet pdf. Equivalent

Part BQ24450
Description INTEGRATED CHARGE CONTROLLER
Feature www.ti.com bq24450 SLUS929C – APRIL 2009 – REVISED FEBRUARY 2012 INTEGRATED CHARGE CONTROLLER FOR L.
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www.ti.com bq24450 SLUS929C – APRIL 2009 – REVISED FEBRUARY BQ24450 Datasheet
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BQ24450
www.ti.com
bq24450
SLUS929C APRIL 2009 REVISED FEBRUARY 2012
INTEGRATED CHARGE CONTROLLER FOR LEAD-ACID BATTERIES
Check for Samples: bq24450
FEATURES
1
Regulates Both Voltage and Current During
Charging
Precision Temperature-Compensated
Reference:
Maximizes Battery Capacity Over
Temperature
Ensures Safety While Charging Over
Temperature
Optimum Control to Maximize Battery Capacity
and Life
Supports Different Configurations
Minimum External Components
Available in 16-Pin SOIC (DW)
APPLICATIONS
Emergency Lighting Systems
Security and Alarm Systems
Telecommunication Backup Power
Uninterruptible Power Supplies
DESCRIPTION
The bq24450 contains all the necessary circuitry to optimally control the charging of valve-regulated lead-acid
batteries. The IC controls the charging current as well as the charging voltage to safely and efficiently charge the
battery, maximizing battery capacity and life. Depending on the application, the IC can be configured as a simple
constant-voltage float charge controller or a dual-voltage float-cum-boost charge controller.
The built-in precision voltage reference is especially temperature-compensated to track the characteristics of
lead-acid cells, and maintains optimum charging voltage over an extended temperature range without using any
external components. The ICs low current consumption allows for accurate temperature monitoring by minimizing
self-heating effects.
The IC can support a wide range of battery capacities and charging currents, limited only by the selection of the
external pass transistor. The versatile driver for the external pass transistor supports both NPN and PNP types
and provides at least 25mA of base drive.
In addition to the voltage- and current-regulating amplifiers, the IC features comparators that monitor the
charging voltage and current. These comparators feed into an internal state machine that sequences the charge
cycle. Some of these comparator outputs are made available as status signals at external pins of the IC. These
status and control pins can be connected to a processor, or they can be connected up in flexible ways for
standalone applications.
External
Supply
Figure 1. TYPICAL APPLICATION SCHEMATIC
RISNS
QEXT
32
ISNSP ISNSM
5 IN
4
IFB
1 ISNS
bq24450
16 15
DRVC DRVE
PRE-CHG 11
CE 12
VFB 13
8 BSTOP
STAT1 10
9 STAT2
GND
6
COMP
14
PGOOD 7
CCOMP
RT RA
RB
RD
RC
A dual-level Float-cum-Boost Charger with Pre-Charge
VRLA
Battery
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 20092012, Texas Instruments Incorporated



BQ24450
bq24450
SLUS929C APRIL 2009 REVISED FEBRUARY 2012
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
DEVICE PACKAGE
SOIC (D)
ORDERING INFORMATION
PACKING
ORDERABLE PART NUMBER
Tube of 50
bq24450D
Reel of 2500
bq24450DR
MARKING
bq24450D
bq24450D
ABSOLUTE MAXIMUM RATINGS(1) (2) (3)
over operating free-air temperature range (unless otherwise noted)
Input Voltage
Voltage
IN
PGOOD, STAT1, STAT2, ISNS
VFB, IFB, ISNSP, ISNSM
BSTOP
PRE-CHG (with respect to IN)
VALUE
0.3 to 40
0.3 to 40
0.3 to 40
0.3 to 40
32
UNIT
V
V
V
V
V
Input Current
Output Current
ISNS
STAT1, STAT2, PGOOD
PRE-CHG
80 mA
20 mA
40 mA
Input Current
DRVC
Output Current
DRVE
Power Dissipation at TA = 25°C
Junction temperature, TJ
Storage temperature, TSTG
80
80
1000
40 to 150
65 to 150
mA
mA
mW
°C
°C
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltage values are with respect to the ground terminal (pin 6) unless otherwise noted.
(3) Positive currents are into, and negative currents out of, the specified terminal.
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless otherwise noted)
VIN
ISTAT1, ISTAT2, IPGOOD
IISNS
TJ
IN voltage range
Input current, open-collector status pins
Input current, open-collector ISNS comparator output
Junction Temperature
MIN MAX UNITS
5 40 V
5 mA
25 mA
40 70 °C
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Product Folder Link(s) :bq24450
Copyright © 20092012, Texas Instruments Incorporated





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