Texas Instruments Evaluation Module for BQ24212, 800mA, Single-Input, Single Cell Li-Ion Battery Solar Charger BQ24212EV BQ24212EVM-678 Datenbogen
Produktcode
BQ24212EVM-678
Introduction
1
Introduction
1.1
EVM Features
•
800-mA, single-input, single-cell Li-ion battery solar charger with Power Path
•
Resistor-programmable setting for charge current and input voltage dynamic power management
•
LED Indication for status
•
Test points for key signals available for testing purposes
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easy probe hook-up
•
Jumpers available
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easy to change setting
1.2
General Description
The bq24210/2 series of devices are highly integrated Li-ion linear chargers devices targeted at
space-limited portable applications. The high input voltage range with input overvoltage protection
supports low-cost unregulated adapters. The input voltage regulation loop with programmable input
voltage regulation threshold make it suitable for charging from alternative power sources, such as solar
panel or inductive charging pad. The integrated circuit (IC) 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 bq24210 has an EN pin
whereas the bq24212 has a MODE pin. See the data sheet for an explanation of the differences between
the two pins.
space-limited portable applications. The high input voltage range with input overvoltage protection
supports low-cost unregulated adapters. The input voltage regulation loop with programmable input
voltage regulation threshold make it suitable for charging from alternative power sources, such as solar
panel or inductive charging pad. The integrated circuit (IC) 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 bq24210 has an EN pin
whereas the bq24212 has a MODE pin. See the data sheet for an explanation of the differences between
the two pins.
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.
For additional details, see the bq24210 or bq24212 data sheet.
1.3
I/O Header Descriptions
Table 1. I/O Header Descriptions
Jack
Description
J1
–
VBUS
Positive input
J1
–
GND
Negative input
J2
–
BAT
Charger output
J2
–
GND
Ground
J2
–
TS
Temperature qualification input
J3-GND
Ground
J3-VDPM
Programs the input voltage regulation threshold
J3-CHG
Charge status indication
J3-EN (BQ24210 only)
Chip ENable control. This pin must be pulled low in order for the device to
operate.
operate.
J3-MODE (BQ24212 only)
Chip MODE control. See data sheet for explanation of chip operation when
MODE is high and low.
MODE is high and low.
J3-PG
Power present indication
J4-ISET
Programs the fast-charge current setting
J4-VTSB
TS bias reference voltage pin, regulated output
J4-GND
Ground
2
800-mA, Single-Input, Single-Cell, Li-Ion Battery Solar Charger With Power Path SLUU477A
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December 2010
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Revised August 2011
Copyright
©
2010
–
2011, Texas Instruments Incorporated