Intersil expands USB-C buck-boost battery charger family

Two USB-C buck-boost battery chargers have been introduced by Intersil that support bidirectional power delivery in ultrabooks, tablets, power banks and other mobile products. According to the company, the single-chip ISL9238 and ISL9238A battery chargers reduce customer bill of materials costs by up to 40%.

Both ICs employ R3 modulation technology to extend battery life and deliver acoustic noise-free operation, superior light-load efficiency and fast transient response.

The chargers operate in forward buck, boost or buck-boost mode to charge mobile battery packs with up to four cell Li-ion batteries. The devices also support USB 3.1 On-The-Go for charging external devices such as smartphones, headphones or virtual reality goggles.

At maximum power, both ICs provide 20V at 5A to the USB-C port for delivery of power up to 100W over a reversible USB Type-C connector cable. In charging mode, the devices take input power from a range of DC power sources, including AC/DC charger adaptors, USB power delivery ports and any travel adaptor.

Both chargers include SMBus and I2C programmable features such as depleted battery trickle charging, and a two-level adaptor current limit for turbo-mode events where the charger takes advantage of the adaptor’s surge current capability.

The ISL9238 and ISL9238A also feature programmable autonomous charging and an end of charge safety timer to stop battery charging.

Additional features:

  • Input voltage range of 3.2V to 23.4V (no dead-zone)
  • System output voltage of 2.4V to 18.304V
  • Up to 1MHz operation
  • ASGATE FET control
  • Low-power and high-power LDO outputs tie to VDD pin
  • Compliant with Intel PROCHOT# and PSYS