AP5002SG-13

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Introduction

Analog Devices\' AP5002SG-13 is a step down DC-DC switching regulator with a current output, adjustable on-time and adjustable current limit. This regulator is classified as part of the PMIC family, and more accurately, as a voltage regulator, DC-DC converter and switch regulator, due to its capacity of providing a constant voltage and current to the system.

Overview

The AP5002SG-13 has four main parameters; input voltage, output voltage, current output and current limit. These characteristics allow the device to provide a regulated power output for a variety of applications. The input voltage range for the device is from 2.7V to 11V. The current output is adjustable from 0.1A to 10A with a tolerance from 0.15A to 0.2A, depending on conditions. The output voltage is adjustable from 0.9V to 6V. The AP5002SG-13 has a maximum operation temperature of 140°C.

Features

The device is housed in a packages such as PDSO-20 and DSP-SOP-20. It is designed to operate with a switching frequency of 400kHz, which can be adjusted to higher frequencies when needed. The device uses a current mode control with a peak current limit, making it capable of limiting inductor peak current without additional current sensing circuitry. The device also has adjustable output voltage, and adjustable on-time, which allows the user to tune the frequency to their desired requirements.

Applications

The AP5002SG-13 is ideal for applications such as USB host applications, embedded systems, computer peripherals, and other low-noise, low-power DC-DC converters. As an adjustable current-limiting device, it can also be used in applications like battery charging, motor control and even hot-swapping.  It can also be used with other devices such as FPGAs and DSPs, to provide a regulated power output with adjustable voltage and current for these types of applications.

Working Principle

The AP5002SG-13 features a control circuit which monitors the output current, adjusting it accordingly by switching an external switch. The control circuit also contains a bias voltage generator, a ramp generator and a comparator, to facilitate a constant current output. The bias voltage generator creates a voltage at the error amplifier input, while the ramp generator creates a ramp voltage between the lower threshold voltage (Vtlr) and upper threshold voltage (Vtur). The comparator then compares the bias voltage with the ramp voltage, switching the external switch on and off according to the difference between them. When the switch is on, the current increases until it reaches a predetermined limit, after which it turns off and the cycle begins again. The process is repeated until a constant current is achieved.

Conclusion

The AP5002SG-13 is a step down DC-DC switching voltage regulator, ideally suited for applications such as USB hosts, embedded systems, computer peripherals, and other low-noise, low-power DC-DC converters. The device has adjustable on-time, adjustable current limit and adjustable output voltage, which allows the user to tune the frequency to their desired output requirements. The device also uses a current mode control with a peak current limit, making it capable of limiting inductor peak current without additional current sensing circuitry. Finally, the device is housed in packages such as PDSO-20 and DSP-SOP-20, with a switching frequency of 400kHz and a maximum operation temperature of 140°C.

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