Charger IC for single-cell Li-ion with USB input
The BQ24038RHLRG4 is a linear charger IC from the bqTINY™ III family, designed for single-cell Lithium Ion or Lithium Polymer battery packs. It accepts a USB bus as the primary power source, with a maximum supply voltage of 16 V — enough headroom for unregulated adapters or USB-C PD inputs without an extra pre-regulator. Charge current is constant and programmable up to 1.5 A maximum, set by an external resistor. The 1.5 A ceiling suits medium-capacity cells in portable instruments, handheld terminals, and medical devices where charge time matters but the board area is tight.
Temperature range and protection set
Operating junction temperature spans -40°C to 125°C, covering industrial enclosures and under-hood automotive auxiliary bays. The charger integrates over-temperature, reverse-current, and short-circuit fault protection — the reverse-current block prevents battery discharge back into the input when the supply is removed. Programmable features include charge current and a safety timer, letting the firmware or BOM resistor set the termination condition. The battery pack voltage is regulated to 4.36 V, a typical full-charge target for Li-ion cells with a 4.2 V nominal plateau.
Package and footprint for thermal management
The 20-VFQFN Exposed Pad package (3.5x4.5 mm body) requires a thermal land on the PCB to sink heat from the 1.5 A charge pass element. The supplier device package is 20-VQFN (3.5x4.5), and the part is supplied on Tape & Reel for automated assembly.
Active production and sourcing posture
Sourced through our distribution channel. No stock-holding claim — quoted to order per RFQ.