TIDA-00042

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

TIDA-00042

Design files

Overview

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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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU095.PDF (293 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDR063.PDF (81 K)

Detailed schematic diagram for design layout and components

TIDR064.PDF (33 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDU096.PDF (95 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Battery charger ICs

BQ24040Standalone 1-cell 1-A linear battery charger with 4.2-V VBAT and Temperature Sensing

Data sheet: PDF
Battery fuel gauges

BQ27421-G1System-side(tm) fuel gauge with integrated Sense Resistor | battery gas gauge

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report TIDA-00042 Test Results Aug. 26, 2013

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