BQ24200DGNG4 Datasheet, PDF (1/20 Pages) Texas Instruments – SINGLE-CHIP LI-ION AND LI-POL CHARGE MANAGEMENT IC FOR CURRENT-LIMITED APPLICATIONS

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bq24200, bq24201
bq24202, bq24203
bq24204, bq24205
SLUS501C – OCTOBER 2001 – REVISED MARCH 2008
SINGLE-CHIP LI-ION AND LI-POL CHARGE MANAGEMENT IC FOR CURRENT-LIMITED
APPLICATIONS
FEATURES
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• Designed Specifically to Work With
Current-Limited Wall Supplies
• Ideal for Low Dropout Charger Design for
Single-Cell Li-Ion Packs With Coke or Graphite
Anodes
• Integrated PowerFET for 500 mA
• Integrated Voltage Regulation With 0.5%
Accuracy
• Battery Insertion and Removal Detection
• Charge Termination by Minimum Current and
Time
• Pre-Charge Conditioning With Safety Timer
• Sleep Mode for Low-Power Consumption
• Charge Status Output for LED or Host
Processor Interface Indicates
• Charge-in-Progress, Charge Completion, and
Fault Conditions
• Optional Temperature Monitoring Before and
During Charge
• Small, 8-Pin Power-Pad MSOP Package
TYPICAL APPLICATION
DESCRIPTION
The bq2420x series are simple Li-Ion linear charge
management devices targeted at low-cost and space
limited charger applications. The bq2420x series offer
integrated powerFET, high-accuracy voltage
regulation, temperature monitoring, charge status,
and charge termination, in a single monolithic device.
The bq2420x is designed to work with a
current-limited wall-mount transformer and therefore
does not provide any current regulation. However,
these devices offer a fixed internal current limit to
prevent damage to the internal powerFET. A
time-limited pre-conditioning phase is provided to
condition deeply discharged cells. Once the battery
reaches the charge voltage, the high accuracy
voltage regulation loop takes over and completes the
charge cycle. Charge is terminated based on
minimum current. An internal charge timer provides a
backup safety for charge termination.
Other standard features include an automatic sleep
mode activated when V_CC falls below the battery
voltage and a recharge feature activated when the
battery voltage falls below the V_RCH threshold.
In addition to the standard features, the core product
provides two additional enhancements: temperature
monitoring and status display. The temperature-
sense circuit continuously measures battery
temperature using an external thermistor and inhibits
charge until the battery temperature is within the
user-defined thresholds. The STAT pin indicates
three conditions of operation of the charger. These
conditions are charge-in-progress, charge complete,
and fault. This output can be used to drive an LED or
an interface to a microcontroller.
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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.
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