AP1501A-K5L-13

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The AP1501A-K5L-13 is an asynchronous step-down DC-DC switching regulator that can provide up to 1.5A of continuous current. It is designed to be used in applications requiring highly efficient power conversion and low component count such as cellular phones, slim PCs, and other battery-powered consumer electronics. It features a wide output voltage range of 1.3V to 5.5V, adjustable switching frequency from 200kHz to 3MHz, low voltage startup capability and internal soft-start that make it suitable for many low voltage/high current DC-DC conversion applications. The device is also versatile enough to be used in many other types of applications such as LED lighting, portable medical devices, or point-of-load (POL) converters in computer systems.

The AP1501A-K5L-13 operates in a step-down, or buck, topology. It consists of an integrated high-side switch (HSS) and low-side switch (LSS), two gate driver channels, an internal oscillator and constant on-time (COT) control block, a compensation network, a feedback loop, short-circuit and over-temperature protection circuits, and an emphasis network.

The device operates in two main modes: DCM and FSEM. In DCM mode, the AP1501A-K5L-13 detects the output voltage and adjusts the on-time accordingly to achieve the desired output voltage. In FSEM mode, the on-time of the AP1501A-K5L-13 is controlled by the internal COT block, to provide a constant frequency output with a variation in duty cycle to maintain the desired output voltage. This provides for a smaller light load ripple and improved light load efficiency.

Other features of the AP1501A-K5L-13 include programmable current limit, internal soft start,precision enable and UVLO (Under Voltage Lock Out) functions that protect the device against unwanted operation. The AP1501A-K5L-13 is RoHS compliant, AEC-Q100 qualified, and is available in a SOP-8 package.

Some of the potential applications of the AP1501A-K5L-13 are as follows:

- Battery powered consumer electronics such as cellphones and portable media players.

- LED lighting systems.

- Automotive systems.

- Point-of-load (POL) applications for computers and server systems.

- Wireless systems.

- Portable medical devices.

This high-efficiency, low component count device is an ideal diode-free synchronous buck regulator for a wide range of applications that require low voltage and high current DC-DC conversion. In particular, the small SOP-8 package, adjustable switching frequency, low voltage start up capability and internal soft-start make the AP1501A-K5L-13 an ideal choice for many consumer and industrial applications.

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