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USB-C charger extends battery life for mobile devices

Posted: 22 Feb 2016     Print Version  Bookmark and Share

Keywords:Intersil  USB-C  battery charger  ultrabook  tablet 

Intersil Corp. has released what it says is the industry's first buck-boost battery charger that supports two-way power delivery in ultrabooks, tablets and power banks using the reversible USB Type-C connector. The single-chip ISL9237 Narrow VDC (NVDC) battery charger supplants similar buck and boost two-chip charger solutions, eliminating a charger IC and inductor to reduce customer bill of materials (BOM) costs by up to 40 per cent, indicated the company.

The ISL9237 leverages Intersil's patented R3 modulation technology for acoustic noise-free operation, excellent light load efficiency and ultra-fast transient response to extend battery run-time.

The USB 3.1-compliant ISL9237 joins the emerging USB-C ecosystem as the first battery charger capable of providing buck-mode, buck-boost-mode, and boost-mode for 1-to-3 cell Li-ion batteries. It also supports USB On-The-Go (OTG) with a 5Vout reverse buck-mode, and reduces traditional two-stage charging to a single-stage buck-boost for improved efficiency. The USB Type-C interface connection enables delivery of data, video and power up to 100W over a single cable.


In charging mode, the ISL9237 takes input power from a wide range of DC power sources, AC/DC charger adapters, USB power delivery (PD) ports and any travel adapter, to charge battery packs with up to 3-series cell Li-ion batteries. The ISL9237 can also operate connected to only a battery, an adapter, or both. The ISL9237's system turbo-mode helps the battery and charger adapter work together to supply the system load when it exceeds the adapter's capability, detailed the company.

In turbo-mode, the ISL9237 quickly turns on the battery BGATE FET to deliver system power. In addition, the ISL9237's 5V to 20V input voltage capability helps boost the USB-C ecosystem to support new power bank products.

The ISL9237 battery charger is the latest member of Intersil's family of mobile computing power management solutions, which include the ISL95852 Vcore PMIC, the ISL95908 peripheral PMIC, and Intersil's discrete PWM controllers (ISL95853/54/55/57). These products power IMVP8-compliant systems using Intel 6th Gen Core processors.

The ISL9237 buck-boost battery charger is available in a 4mm x 4mm, 32-lead QFN package and priced at $3.50 in 1k quantities.

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