STMicroelectronics, a global semiconductor leader serving customers across the spectrum of electronics applications, is strengthening its position in the rapidly growing mobile charger, home appliance, and industrial power markets, where demand for high-efficiency, ultra-compact power solutions is growing, with a new rectifier controller optimized for charger, power adapter, and switching-mode power supply (SMPS) designs.

ST announced on the 22nd that it is strengthening its strategy in the power conversion market by launching the ultra-small synchronous rectifier controller 'SRK1004'.

This new product focuses on increasing efficiency while reducing the secondary design space of active clamp (ACF), resonant (AHB), and quasi-resonant (QR) flyback converters.

The SRK1004 is an ultra-small IC measuring 2mm x 2mm that replaces the existing SRK1001 and has further enhanced efficiency and robustness by applying a new switch-off algorithm.

ST's strategy with this product is to secure competitiveness in the latest charger and adapter market that requires high-density power design.

The SRK1004 series consists of a total of six models, increasing design flexibility.

Users can choose between logic-level or standard MOSFET gate drive, with optional 25ns or 150ns turn-off delay for drain inductance compensation.br />
Additionally, the stability of flyback-based power design has been improved by incorporating a turn-on window generation circuit that prevents unnecessary switching.

The gate output supports up to 1.6A sink current and 0.6A source current, and the 500kHz switching frequency enables compact, low-cost designs.

This specification is suitable for the latest USB-PD chargers, home appliances, and industrial power supplies where high-efficiency power conversion is essential.

The SRK1004 is built on ST's Silicon-on-Insulator (SOI) process and can withstand up to 190V drain-source voltage, reliably controlling MOSFETs in either low-side or high-side configurations.

The supply voltage range is wide, from 4V to 36V, making it suitable for various power supply designs.

A significant advantage, particularly in low-side configurations, is that power is supplied directly from the converter output, while in high-side configurations, power is supplied directly from the transformer, eliminating the need for a separate auxiliary power supply. This reduces the number of components and bill of materials (BOM) costs.

The IC includes a linear regulator to supply power to the gate driver and internal circuits, and can also provide power to external circuits, increasing design convenience.

To support rapid adoption of the SRK1004 series, ST offers six individual evaluation boards (EVLSRK1004A-F).

This allows designers to easily select the most suitable model from a variety of converter circuits and MOSFET combinations.

The SRK1004 is currently in mass production and is available in a thermally enhanced 6-lead DFN package. Pricing starts at $0.36 per unit in quantities of 1,000, ensuring competitive pricing.