While the line between “smartphones” and “tablets” becomes increasingly blurry, it’s clear that the charger for either device needs to be as small, lightweight and efficient as possible. NXP Semiconductors introduced its new GreenChip solution designed to make smartphone and tablet chargers more compact, energy-efficient and cost-effective – without sacrificing reliability. Used together, the GreenChip TEA1720A and TEA1705 are high-performance, low-power controllers for mobile device chargers up to 10W. The new ICs are the latest additions to the energy-saving GreenChip power IC portfolio, which as of this month has shipped its one-billionth device worldwide.
The new GreenChip solution introduces an innovative architecture that uses the secondary side (TEA1705) for load-step detection, generating wake-up interrupts to the primary side (TEA1720A) in burst mode. The TEA1720A is the primary sensing SMPS (switched mode power supply) controller driving an external bipolar transistor, while the TEA1705 functions as the secondary-side transient controller. Together, the TEA1720A and TEA1705 deliver a fast transient response (5V ±5%). This approach supports the use of smaller output capacitors – 2 × 270 µF or lower – which, combined with the high integration level of the overall GreenChip solution, reduces the PCB space required and enables chargers in a compact form factor of about 1 inch3. It also enables very low no-load power consumption of under 10 mW.
Availability
The GreenChip TEA1720A and TEA1705 are sampling with lead customers now and scheduled to go into mass production in Q2 2013.
