Datasheet
1 Fm
1 Fm
1kW
1.5kW
1.5kW
2kW
DisconnectafterDetection
+
BatteryPack
VBUS
GND
D+
D-
USBPort
DC+
GND
Adaptor
VDD
D-
D+
GND
TTDM/BAT_EN
Host
SystemLoad
OR
ISET/100/500mA
1
2
3
4
5
10
9
8
7
6
IN
ISET
VSS
PRETERM
PG
NC
ISET2
CHG
TS
OUT
bq24040
+
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bq24040, bq24041, bq24045
SLUS941E –SEPTEMBER 2009–REVISED FEBRUARY 2014
bq2404x 1A, Single-Input, Single Cell Li-Ion and Li-Pol Battery Charger With Auto Start
1 Features 3 Description
The bq2404x series of devices are highly integrated
1
• Charging
Li-Ion and Li-Pol linear chargers devices targeted at
– 1% Charge Voltage Accuracy
space-limited portable applications. The devices
– 10% Charge Current Accuracy
operate from either a USB port or AC adapter. The
high input voltage range with input overvoltage
– Pin Selectable USB 100mA and 500mA
protection supports low-cost unregulated adapters.
Maximum Input Current Limit
The bq2404x has a single power output that charges
– Programmable Termination and Precharge
the battery. A system load can be placed in parallel
Threshold, bq24040 and bq24045
with the battery as long as the average system load
– High voltage (4.35V) Chemistry Support with
does not keep the battery from charging fully during
bq24045
the 10 hour safety timer.
• Protection
The battery is charged in three phases: conditioning,
– 30V Input Rating; with 6.6V or 7.1V Input
constant current and constant voltage. In all charge
Overvoltage Protection
phases, an internal control loop monitors the IC
junction temperature and reduces the charge current
– Input Voltage Dynamic Power Management
if an internal temperature threshold is exceeded.
– 125°C Thermal Regulation; 150°C Thermal
Shutdown Protection
The charger power stage and charge current sense
functions are fully integrated. The charger function
– OUT Short-Circuit Protection and ISET short
has high accuracy current and voltage regulation
detection
loops, charge status display, and charge termination.
– Operation over JEITA Range via Battery
The pre-charge current and termination current
NTC – 1/2 Fast-Charge-Current at Cold, 4.06V
threshold are programmed via an external resistor on
at Hot, bq24040 and bq24045
the bq24040 and bq24045. The fast charge current
value is also programmable via an external resistor.
– Fixed 10 Hour Safety Timer, bq24040 and
bq24045
Device Information
• System
ORDER NUMBER PACKAGE BODY SIZE
– Automatic Termination and Timer Disable
bq24040DSQ WSON (10) 2mm x 2mm
Mode (TTDM) for Absent Battery Pack With
bq24041DSQ WSON (10) 2mm x 2mm
Thermistor, bq24040 and bq24045
bq24045DSQ WSON (10) 2mm x 2mm
– Status Indication – Charging/Done
– Available in Small 2× 2mm
2
DFN-10 Package
Simplified Schematic
– Integrated Auto Start Function for Production
Line Testing, bq24041
2 Applications
• Smart Phones
• PDAs
• MP3 Players
• Low-Power Handheld Devices
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.