Programmable Synchronous Boost Converter For Space Constrained Applications

By Sharad Bhowmick

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Diodes Incorporated has released AP72250, a high-efficiency synchronous boost converter. The boost converter is a mode-programmable synchronous boost converter from the company. The Ap72250 has multiple operating modes, that allow adjusting power and efficiency based on the requirements of the operation, it is capable of achieving a switching frequency of up to 900kHz. The converter is designed for low voltage product that needs to achieve compact size in step-up conversion application such as battery-powered devices, USB power supply units, power banks, supercapacitor charging equipment, and metering systems.

According to the company, the AP72250 targets consumer and industrial applications where small form factors are a priority. The module supports a switching frequency of 900kHz switching with a 20µA quiescent current (IQ). It is capable of operating at a wide input voltage range between 0.6V and 5.5V and has an output voltage range between 1.7V to 5.5V. The AP72250 has multiple operation modes which can easily be programmed according to the user’s needs. The operation modes include ultra-sonic mode (USM), pulse frequency modulation (PFM), and forced pulse width modulation (FPWM) mode. It also employs a 26mΩ low-side power MOSFET and a 20mΩ high-side power MOSFET.

Different operating modes in the AP72250 are pulse frequency modulation (PFM), ultra-sonic mode (USM), and forced pulse width modulation (FPWM) mode. These modes can be programmed to select between performance and efficiency. The modes can easily be programmed. Through its USM mode, switching in the audible frequency range is prevented.

The AP72250 delivers a smooth transition between boost and pass-through operations, it also offers great line and loads transient responses. The converter also has a peak current mode control scheme that enables it to handle various input-to-output ratios. The AP72250 is available in a WLCSP-12 package measuring 1.75mm x 1.35mm x 0.45mm. The product is available for purchase at $0.31 in 1000-piece quantities.


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