DC/DC converter increases smartphone battery life

2nd June 2015
Siobhan O'Gorman

Achieving typical efficiencies greater than 95%, the miniature AP3403 step-down DC/DC converter from Diodes Incorporated helps lengthen the battery lifetime of smartphones and other low-voltage portable products. This converter is a synchronous PWM device that drives a load at up to 600mA, with high efficiency maintained through a configuration of external resistor, capacitor and inductor components.

To support mini Li-Ion battery operation, the device features a 2.7-5V input voltage range with a no-load current of 34µA. The buck converter ensures outstanding line and load regulation and employs current mode control to deliver the fastest possible transient response and cycle-by-cycle current limit.

By operating at a ripple-reducing fixed 2MHz, the AP3403 is able to help reduce the cost and size of external circuit components, while its ultra-small, thermally efficient U-DFN1616 package further aids a reduction in overall circuit footprint.

The device’s output voltage range of 0.7-5.5V makes it easy configurable to application requirements. System integrity is maintained by a comprehensive array of built-in features that include under-voltage lockout, over-temperature protection, hiccup mode short-circuit protection, and soft-start functionality.

The AP3403 600mA buck converter from Diodes Incorporated is priced at $0.33 each and sold in 1,000-piece quantities. An evaluation board is also available.

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