1.2A Li-Ion linear charger in a 20-VQFN
The Texas Instruments BQ24003RGWR is a single-cell linear charger IC for Lithium Ion batteries, delivering a constant charge current up to 1.2A to a 4.2V battery pack. It integrates over-temperature fault protection and offers programmable charge current and charge timer via external components.
Obsolete — sourcing through independent distribution
The BQ24003RGWR is listed as Obsolete in the lifecycle record.
Charge profile and supply rail limits
The charger operates from a supply voltage up to 10V maximum, which covers standard 5V USB or wall-adapter inputs with margin. The constant-current charge algorithm is fixed — no PWM or switching stage — so thermal dissipation at 1.2A charge current must be managed via the exposed pad and PCB copper area. Operating temperature is rated from -40°C to 70°C, which suits consumer and most industrial portable equipment but does not cover extended automotive or high-temp environments. The programmable timer provides a safety backup to terminate charging if the battery does not reach full voltage within the set window.