Fairchild Semiconductor is providing designers of cell phones, datacards and netbooks a 6MHz synchronous buck regulator that delivers high efficiency in a compact and razor-thin footprint.
The FAN5361's optimized design mitigates losses leading to 91 percent peak efficiency. The device's light load efficiency claims to be best-in-class at 82 percent at 1 mA load current. By reducing wasted energy, the synchronous DC/DC step-down converter enables longer battery life and less heat dissipation in portable applications that continually strive to accommodate rich functionality.
The FAN5361 is a 6 MHz 600 mA Buck regulator that allows the use of tiny 470 nH chip inductors and 0402 case size input and output capacitors. Compatibility with these passive components allows system designers to pick chip inductors and capacitors that consume less board space at a lower cost, resulting in smaller and more affordable end applications. The DC/DC converter is packaged in a 0.99 x 1.39 mm WL-CSP package with a sleek, low profile of 0.6 mm, conserving board space for these space-constrained applications.
The product uses a proprietary ultra-fast architecture offering robust transient response while consuming low quiescent current, making the application more resilient to sudden fluctuations in processor or I/O loads.
"In addition to handling large load steps with ease, this architecture minimizes system disturbances during gradual mode transitions as well," said Peter Khairolomour, technical marketing manager at Fairchild Semiconductor. "When slowly ramping up the load across the pulse-frequency modulation (PFM) to pulse-width modulation (PWM) transition point, our customers will notice a very seamless transition as opposed to the output voltage overshoot often seen in more traditional architectures. This is especially important because the transition point occurs in the 150 mA range where many loads spend a significant amount of their time."
The solution operates at input voltages ranging from 2.3 V to 5.5 V, meeting the requirements for today's single Li-Ion and multiple alkaline/NiMH cell applications. Fixed output voltage options are available ranging from 1.0 V to 1.82 V.
Availability and Pricing
Samples are available now. Price (each, 1000 pcs.): $ US 0.78
Datasheet for: FAN5361