NXP chip enables more efficient mobile charging

The device uses the company's 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 switched mode power supply controller driving an external bipolar transistor, while the TEA1705 functions as the secondary side transient controller. Together, the ics are designed to deliver a fast transient response of 5V ±5%. According to NXP, this approach supports the use of smaller output capacitors – 2 x 270µF or lower – lowering the pcb space required and enabling smaller chargers of about 1in³. Marcel van Roosmalen, general manager of NXP's power solutions product line, said: "From a manufacturer's point of view, we're offering an elegant, highly integrated solution that reduces the number of external components required, for higher efficiency, higher power density, significant cost savings and robust performance."