High-efficiency wireless power transmitters for wire-free charging

November 21, 2014 // By Graham Prophet
With high levels of integration and low standby power consumption, these high-efficiency devices from IDT target wireless charging systems for smart phones, wearables and furniture.

As an expansion to IDT's existing portfolio of products, these compact transmitters feature low electromagnetic interference (EMI) and high efficiency; the P9235 and P9236 transmitters are compliant with the latest Wireless Power Consortium (WPC) Qi standard, while the P9234 is a Power Matters Alliance (PMA)-compliant device.

IDT is also introducing a proprietary-mode device, the P9231, which operates at resonant frequency of up to 1 MHz, allowing for a smaller coil. To complete the product offering, IDT’s P9230 is a dual-mode transmitter, supporting both WPC and PMA standards. Collectively, the P923x family addresses all of the various WPC low-power coil configurations, the company says.

Incoportating an integrated 32-bit ARM Cortex-M0 processor, the P923x family offers a high level of programmability and flexibility while consuming very low standby power to meet Energy Star requirements. The transmitters span input voltages ranging from 4.0 V to 21 V and target applications requiring from 0.5 to 10W of power. The devices integrate all digital and analogue functions.

The P9235 is a full-bridge, single coil device, compliant with WPC A5/A11, QFN5X5-40, while the P9236 is a half-bridge, single and multi-coil configuration, QFN6X6-48.

Available soon are the P9230, a half-bridge dual-mode chip compliant with WPC A1/A10 and PMA type 3 configurations, the P9231, designed for proprietary mode applications, including wearables, and the P9234, a PMA-compliant transmitter.

IDT; www.idt.com