New InnoSwitch-CP ICs Improve Charging Performance of Smart Mobile Devices

Power Integrations announced its InnoSwitch™-CP family of off-line CV/CC flyback switching ICs, a successor of the recently introduced Innoswitch-EP . The new devices incorporate a constant power output profile which, when paired with an adaptive-voltage protocol such as Qualcomm® Quick Charge™ 3.0 or USB-PD, permits smart mobile device makers to optimize charging time across a range of products. Adaptive charging achieve faster charge times, improved charging efficiency and backward compatibility with the popular 5 V USB BC 1.2 specification, all while minimizing overall thermal management and battery charging system cost.

The InnoSwitch-CP combines a high-voltage power MOSFET switch, along with both primary- and secondary-side controllers in one device. It has a novel inductive coupling feedback scheme using the package leadframe and bond wires for accurate direct sensing of the output voltage and output current on the secondary to communicate information to the primary IC. This so-called FluxLink™ technology enables secondary-side control with the simplicity and low component count usually associated with primary-side regulation. FluxLink also optimizes the effectiveness of output synchronous rectification, resulting in high efficiency across the full load range. For example, no-load consumption at 230 VAC is less than 10 mW, while full-load efficiency exceeds 90 %.

Unlike conventional PWM (pulse width modulated) controllers, it uses a simple ON/OFF control to regulate the output voltage and current. The primary controller consists of an oscillator, a receiver circuit magnetically coupled to the secondary controller, current limit state machine, 5.95 V regulator, over-voltage circuit, current limit selection circuitry, over-temperature protection, leading edge blanking and a 650 V power MOSFET.

The secondary controller consists of a transmitter circuit that is magnetically coupled to the primary receiver, constant voltage (CV) and constant current (CC) control circuitry, a 4.4 V regulator, synchronous rectifier MOSFET driver, frequency jitter oscillator and a host of integrated protection features.

Two devices are available: The INN2214K IC delivers 15 W constant output power between 5 and 9 V for universal voltage chargers and adapters, while the larger INN2215K part delivers up to 22 W for similar applications. InnoSwitch-CP samples are available now. Devices are priced at $0.90 in 10,000-piece quantities. More in our upcoming printed issue. AS

www.power.com/innoswitch-cp/