BQ24205 500-mA, 4.1-V Li-Ion Charger for Current-Limited App. in MSOP-8 | TI.com

BQ24205
This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
500-mA, 4.1-V Li-Ion Charger for Current-Limited App. in MSOP-8

 

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 VCC falls below the battery voltage falls below the VRCH threshold.

In addition to the standard features, the core product provides two additional enhancements: temperature monitoring and status display. The temperaturesense 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.

Features

  • 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

Parametrics

Compare all products in Battery charger ICs Email Download to Excel
Part number Order Number of series cells Function Cell chemistry Charge current (Max) (A) Operating Vin (Min) (V) Operating Vin (Max) (V) Absolute Vin (safety rating) (Max) ((V)) Battery charge voltage (Min) (V) Battery charge voltage (Max) (V) Features Control interface Control topology Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
BQ24205 Order now 1     Charger     Li-Ion/Li-Polymer     0.5     2.8     13.5     16.5     4.1     4.1     Integrated FET     Standalone (RC-Settable)     Linear     Catalog     -40 to 85     HVSSOP | 8     8HVSSOP: 15 mm2: 4.9 x 3 (HVSSOP | 8)    
BQ24200 Samples not available 1     Charger     Li-Ion/Li-Polymer     0.5     2.8     13.5     16.5     4.2     4.2     Integrated FET
Temp Monitoring (Thermistor Pin)    
Standalone (RC-Settable)     Linear     Catalog     -40 to 85     HVSSOP | 8     8HVSSOP: 15 mm2: 4.9 x 3 (HVSSOP | 8)    
BQ24201 Samples not available 1     Charger     Li-Ion/Li-Polymer     0.5     2.8     13.5     16.5     4.1     4.1     Integrated FET
Temp Monitoring (Thermistor Pin)    
Standalone (RC-Settable)     Linear     Catalog     -40 to 85     HVSSOP | 8     8HVSSOP: 15 mm2: 4.9 x 3 (HVSSOP | 8)    
BQ24202 Samples not available 1     Charger     Li-Ion/Li-Polymer     0.5     2.8     13.5     16.5     4.2     4.2     Integrated FET     Standalone (RC-Settable)     Linear     Catalog     -40 to 85     HVSSOP | 8     8HVSSOP: 15 mm2: 4.9 x 3 (HVSSOP | 8)    
BQ24203 Samples not available 1     Charger     Li-Ion/Li-Polymer     0.5     2.8     13.5     16.5     4.1     4.1     Integrated FET     Standalone (RC-Settable)     Linear     Catalog     -40 to 85     HVSSOP | 8     8HVSSOP: 15 mm2: 4.9 x 3 (HVSSOP | 8)