Texas Instruments BQ24090 Single Input, Single Cell Li-Ion and Li-Pol Linear Battery Charger Evaluation Module BQ24090EV BQ24090EVM Datenbogen
Produktcode
BQ24090EVM
Introduction
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1
Introduction
The bq24090/1/2/3 series of devices are highly integrated Li-ion linear charger devices targeted at
space-limited portable applications. The devices operate from either a USB port or AC adapter.
space-limited portable applications. The devices operate from either a USB port or AC adapter.
The bq24090/1/2/3 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.
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.
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
bq24090/1/2/3. The fast charge current value is also programmable via an external resistor.
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
bq24090/1/2/3. The fast charge current value is also programmable via an external resistor.
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Considerations With Evaluating the bq24090/1/2/3
Refer to the data sheet for specific details on the charger ICs. The main differences between the bq24090,
at 25° and bq24091 is that NTC thermistor valve is 10k for bq24090 and 100k for bq24091.
at 25° and bq24091 is that NTC thermistor valve is 10k for bq24090 and 100k for bq24091.
The ISET current control loop sets the maximum charge current. This maximum programmed current level
can be further reduced by entering a USB mode, selected by the ISET2 pin.
can be further reduced by entering a USB mode, selected by the ISET2 pin.
A system load may be connected to the OUT pin, which takes away some of the charge current. Normally
it is not recommended to operate the device in pre-charge since the system load keeps the battery from
recovering; but, since the PRE_TERM pin can program a higher pre-charge current this restriction is not
necessary.
it is not recommended to operate the device in pre-charge since the system load keeps the battery from
recovering; but, since the PRE_TERM pin can program a higher pre-charge current this restriction is not
necessary.
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Performance Specification Summary
Specification
Test Conditions
MIN
TYP
MAX
UNIT
Input DC voltage, Vin
Recommended input voltage range
4.45
6.45
V
Reduced Performance, Vin
(1)
Will not charge with Over Voltage input condition. Limited
3.5
28
V
charging with under voltage input.
Power Dissipation
(2)
P
DISS
= (V
IN
– V
OUT
) × I
OUT
1.5
W
I
OUT
RISET = 1k
0.54
0.8
A
(1)
Input voltage range is specified for normal operation. Input voltage between UVLO and 4.75 V has limited functionality, but does
not damage the IC nor present any safety issue with the battery. Input voltage above OVP and less than 30 Vdc has no
operation and will not damage the IC. Lower input voltage (closer to dropout operation) produces less heat dissipation and
potentially better performance.
not damage the IC nor present any safety issue with the battery. Input voltage above OVP and less than 30 Vdc has no
operation and will not damage the IC. Lower input voltage (closer to dropout operation) produces less heat dissipation and
potentially better performance.
(2)
The junction temperature rise above ambient is proportional to the power dissipation. Once the junction temperature reaches
~125°C, thermal regulations reduces the programmed charge current.
~125°C, thermal regulations reduces the programmed charge current.
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Test Summary
The bq24090/1/2/3 EVM board requires a 5-VDC, 1-A power source to provide input power and a
single-cell Li-ion or Li-polymer battery pack. The test setup connections and jumper setting selections are
configured for a stand-alone evaluation; but, can be changed to interface with external hardware such as a
microcontroller.
single-cell Li-ion or Li-polymer battery pack. The test setup connections and jumper setting selections are
configured for a stand-alone evaluation; but, can be changed to interface with external hardware such as a
microcontroller.
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1.0-A Single-Input, Single-Cell Li-Ion Battery Charger
SLUU392A – December 2009 – Revised June 2010
Copyright © 2009–2010, Texas Instruments Incorporated