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Diodes unveils AP72250 for step-up conversion

The synchronous boost converter is targeted at step-up conversion in consumer and industrial applications where small form factors are a design priority. Potential users are battery-powered devices, USB power supply units, power banks, supercapacitor charging equipment and metering systems.

The AP72250 supports a 900kHz switching frequency with a 20µA quiescent current (IQ). Input range is 0.6V to 5.5V, with a minimum 1V input startup and output ranges from 1.7 to 5.5V. The boost converter design also integrates a 20mΩ high side power MOSFET and a 26mΩ low side power MOSFET.

Operating modes can be programmed according to users’ needs and selected as required. Operating options are pulse frequency modulation (PFM), ultra-sonic mode (USM), and forced pulse width modulation (FPWM) mode. Engineers can adjust operation under either heavy or light load conditions to maximise efficiency, explains the company. As a result, even when in light load situations, up to 89% efficiency can be attained. When in the USM mode, switching in the audible frequency range is prevented.

There is a seamless transition between boost and pass-through operation, says the company and the peak current mode control scheme allows the AP72250 to handle a wide variety of input-to-output ratios. This reduces the number of external components needed to support the converter compared with competing devices, says the company, contributing to lowering the bill of materials (BoM) costs.

Under-voltage lockout, thermal shutdown, peak current limit, negative current limit, and output short circuit protection functions are also included.

The AP72250 is supplied in a WLCSP-12 package (measuring 1.75mm x 1.35mm x 0.45mm).

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