Intersil has introduced USB-C-supported buck-boost battery chargers that allow bidirectional charging in mobile devices like ultrabooks, tablets and power banks.

The single-chip ISL9238 and ISL9238A battery chargers use Intersil's R3 modulation technology, which extends battery life and deliver noise-free operation, light-load efficiency and fast transient response.

The buck-boost battery chargers add 5V-20V reverse boost for USB charging of smartphones and headphones while on the go.

They operate in forward buck, boost or buck-boost mode to fast charge mobile battery packs with up to 4-cell Li-ion batteries. They also support USB 3.1 On-The-Go (OTG) with 5V/20V reverse buck, boost or buck-boost mode to deliver power out of a USB-C port 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 up to 100W over a reversible USB Type-C connector cable. The ISL9238A features the same capabilities as the ISL9238, but includes a different SMBus address for OEMs that want to use both ICs to design systems with dual USB-C ports.

In charging mode, the ISL9238 and ISL9238A take input power from a wide range of DC power sources, including AC/DC charger adapters, USB power delivery (PD) ports and any travel adapter. Both chargers include SMBus and I2C programmable features such as depleted battery trickle charging, and a two-level adapter current limit for when the charger uses the adapter's surge current capability. The ISL9238 and ISL9238A also feature programmable autonomous charging and an end of charge safety timer to stop battery charging.

The ISL9238 and ISL9238A are pin-compatible with the ISL9237 USB-C battery charger and are part of Intersil's mobile computing power management solutions, including the ISL95852 Vcore PMIC, ISL95908 peripheral PMIC, and discrete PWM controllers (ISL95853/54/55/57). These ICs power IMVP8-compliant mobile systems using 6th and 7th-gen Intel Core processors.

The ISL9238 and ISL9238A buck-boost battery chargers are available now and priced at $3.50 USD in 1k quantities. Both battery chargers are supplied in 4mm x 4mm, 32-lead TQFN packages.