Texas Instruments bq24200, bq24201, bq24202, bq24203, bq24204, bq24205 Data Sheet Manual

SLUS501A – OCTOBER 2001

FEATURES DESCRIPTION Designed Specifically to Work With

The bq2420x series are simple Li-Ion linear

Current-Limited Wall Supplies

charge management devices targeted at low-cost

Ideal for Low Dropout Charger Design for and space limited charger applications. The Single-Cell Li-Ion Packs With Coke or bq2420x series offer integrated power FET, Graphite Anodes high-accuracy voltage regulation, temperature

monitoring, charge status, and charge

Integrated Power FET for 500 m A

termination, in a single monolithic device.

Integrated Voltage Regulation With 0.5% Accuracy The bq2420x is designed to work with a

current-limited wall-mount transformer and

Battery Insertion and Removal Detection

therefore does not provide any current regulation.

Charge Termination by Minimum Current and

However, these devices offer a fixed internal

current limit to prevent damage to the internal

Pre-Charge Conditioning With Safety Timer

power FET. A time-limited pre-conditioning phase

Sleep Mode for Low-Power Consumption is provided to condition deeply discharged cells.

Once the battery reaches the charge voltage, the

Charge Status Output for LED or Host

high accuracy voltage regulation loop takes over

Processor Interface Indicates

and completes the charge cycle. Charge is

Charge-in-Progress, Charge Completion, and

terminated based on minimum current. An internal

Fault Conditions

charge timer provides a backup safety for charge

Optional Temperature Monitoring Before and

termination.

During Charge

Other standard features include an automatic

Small, 8-Pin Power-Pad MSOP Package

sleep mode activated when VCC falls below the battery voltage and a recharge feature activated when the battery voltage falls below the VRCH

TYPICAL APPLICATION

threshold.

bq24202DGN

DC+ In addition to the standard features, the core product provides two additional enhancements:

OUT 8IN

temperature monitoring and status display. The

C1 temperature-sense circuit continuously measures

VCC 7BAT

battery temperature using an external thermistor and inhibits charge until the battery temperature is

STAT 6CE within the user–defined thresholds. The STAT pin

indicates three conditions of operation of the

R1 charger. These conditions are charge-

VSS 5N/C

in-progress, charge complete, and fault. This

BATTERY PACK

output can be used to drive an LED or an interface

UDG–01111

to a microcontroller.

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