1A Single-Input Single-Cell Li-Ion Battery Charger Reference Design

(ACTIVE) TIDA-00042

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Description

This reference design is targeted at space-limited portable applications. The devices in the design operate from either a USB port or AC adapter. The solution 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 reference design 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. The charger power stage and charge current sense functions are fully integrated. The board 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 bq24040. The fast charge current value is also programmable via an external resistor.

Features
  • # Series Cells: 1S
  • Max Input Volts: 30V
  • Max Charge Current: 1A
  • Topology: Linear Mode


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Schematic/Block Diagram

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Test Data

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Design Files

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TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
BQ24040  1A Single-Input, Single Cell Li-Ion Battery Charger. Vovp=6.6V | Linear  Battery management  Sample & Buy View Design Kits & Evaluation Modules
BQ27421-G1  System-Side(tm) Fuel Gauge With Integrated Sense Resistor | Battery Gas Gauge  Battery management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
BQ24040 Download Download
BQ27421-G1 Download -

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date
PDF 234 26 Aug 2013
Design files (3)
Title Abstract Type Size (KB) Date
PDF 95 26 Aug 2013
PDF 33 26 Aug 2013
PDF 81 26 Aug 2013

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