BQ24040_16 Datasheet, PDF (1/38 Pages) Texas Instruments – Single Cell Li-Ion and Li-Pol Battery Charger With Auto Start

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
bq24040, bq24041, bq24045
SLUS941F – SEPTEMBER 2009 – REVISED MARCH 2015
bq2404x 1A, Single-Input, Single Cell Li-Ion and Li-Pol Battery Charger With Auto Start
1 Features
•1 Charging
– 1% Charge Voltage Accuracy
– 10% Charge Current Accuracy
– Pin Selectable USB 100mA and 500mA
Maximum Input Current Limit
– Programmable Termination and Precharge
Threshold, bq24040 and bq24045
– High voltage (4.35V) Chemistry Support with
bq24045
• Protection
– 30V Input Rating; with 6.6V or 7.1V Input
Overvoltage Protection
– Input Voltage Dynamic Power Management
– 125°C Thermal Regulation; 150°C Thermal
Shutdown Protection
– OUT Short-Circuit Protection and ISET short
detection
– Operation over JEITA Range via Battery
NTC – 1/2 Fast-Charge-Current at Cold, 4.06V
at Hot, bq24040 and bq24045
– Fixed 10 Hour Safety Timer, bq24040 and
bq24045
• System
– Automatic Termination and Timer Disable
Mode (TTDM) for Absent Battery Pack With
Thermistor, bq24040 and bq24045
– Status Indication – Charging/Done
– Available in Small 2×2mm² DFN-10 Package
– Integrated Auto Start Function for Production
Line Testing, bq24041
2 Applications
• Smart Phones
• PDAs
• MP3 Players
• Low-Power Handheld Devices
3 Description
The bq2404x series of devices are highly integrated
Li-Ion and Li-Pol linear chargers devices targeted at
space-limited portable applications. The devices
operate from either a USB port or AC adapter. The
high input voltage range with input overvoltage
protection supports low-cost unregulated adapters.
The bq2404x has a single power output that charges
the battery. A system load can be placed in parallel
with the battery as long as the average system load
does not keep the battery from charging fully during
the 10 hour safety timer.
The battery is charged in three phases: conditioning,
constant current and constant voltage. In all charge
phases, an internal control loop monitors the IC
junction temperature and reduces the charge current
if an internal temperature threshold is exceeded.
The charger power stage and charge current sense
functions are fully integrated. The charger function
has high accuracy current and voltage regulation
loops, charge status display, and charge termination.
The pre-charge current and termination current
threshold are programmed via an external resistor on
the bq24040 and bq24045. The fast charge current
value is also programmable via an external resistor.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq24040
WSON (10)
2.00 mm x 2.00 mm
bq24041
WSON (10)
2.00 mm x 2.00 mm
bq24045
WSON (10)
2.00 mm x 2.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
1.5kW
Adaptor
DC+
GND
OR
USB Port
VBUS
GND
D+
D-
1kW
1mF
2kW
bq24040
1 IN
2 ISET
3 VSS
OUT 10
1.5kW
TS 9
CHG 8
Battery Pack
++
4 PRETERM ISET2 7
5 PG
NC 6
Disconnect after Detection
System Load
1mF
VDD
TTDM/BAT_EN
ISET/100/500mA
GND
D+
D-
Host
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.