Power Electronics

Power Supply Suits Application Microprocessors

ON Semiconductor’s NCP1526 is a synchronous dc-dc buck (step-down) converter featuring an integrated low-noise LDO. Offered in a unique 0.55 mm ultra-thin DFN package, it is ideal for portable applications. The device is designed to power an application microprocessor in multimedia portable devices.

This device integrated buck converter accepts input voltage from 2.7 V to 5.2 V, and features a 3.0 MHz buck converter that supplies a fixed output voltage with current capability of 400 mA. The NCP1526 delivers fast transient response, making the converter ideal to power the digital core of a portable microprocessor. The device’s integrated LDO provides a 150-mA current capability and its low noise characteristic enables it to power radio frequency (RF) sensitive analog circuitry.

The high frequency oscillator in the NCP1526 converter dramatically reduces the size of external components. A surface-mount inductor between 1 µH and 4.7 µH is recommended. The device’s integrated synchronous rectifier maximizes efficiency and minimizes solution part count. The integrated regulators are packaged in a footprint of 3 mm x 3 mm. To ensure optimal component size and safe operation, value added features like soft-start, cycle-by-cycle current limiting, and thermal shutdown protection have also been integrated.

The NCP1526 offers a fixed output of 1.2 V from the converter and 2.8 V from the LDO. Other output voltage options are available upon request. The device is offered in a 3-mm x 3-mm x 0.55-mm DFN-10 package. It is priced at $0.90 per unit in 3000-unit quantities.

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