20-MHz buck regulator enables designers draw their own PCB inductors
The device offers an ultra-fast, 20 MHz switching frequency that, when used with Semtech’s patented X-EMI inductor technology, for the first time allows PCB trace inductors to meet or exceed the EMI performance of chip inductors. Additionally, X-EMI technology eliminates the substantial cost and logistics issues associated with sourcing, qualifying and stocking discrete inductors. Achieving low EMI with PCB trace inductors makes the SC220 an ideal solution for set top box, HDTV, automotive, industrial, and white goods power management applications.
Conventional PCB trace inductors can be used with high-frequency switchers, but they exhibit EMI issues. X-EMI inductor technology solves these EMI problems and meets, or exceeds the EMI performance of chip inductors. X-EMI technology works by placing two small air-core inductors adjacent to one another in anti-phase position, where the magnetic fields of each inductor partially cancel one another to reduce EMI.
Step-down regulators decrease voltages incoming from the main power source to meet the output voltage needed by the system components. The SC220 steps down input voltages ranging from 2.7 V to 5.5 V, making it ideal for low-voltage rails. High switching frequency and ultra-fast, hundreds of nanosecond transient response is achieved using Semtech’s constant frequency architecture.
The SC220 step-down regulator features an adjustable output voltage down to 1.0 V and an output current of up to 650 mA. At very light loads, the device maintains greater than 80% efficiency to help meet global eco regulations. Protection features include inrush protection, along with output current limit, short-circuit and thermal shutdown protection.
Visit Semtech at www.semtech.com
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