MAX15588GTL+T

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The MAX15588GTL+T is a modern device which falls within the PMIC (Power Management Integrated Circuit) Voltage Regulators DC DC Switching Controllers category. It is designed for applications requiring up to 18A of clean output current proportionally to user-programmed output voltages in the 0.8V to 5.2V range. The device features programmable switching frequency up to 1MHz, adjustable output voltage, accurate current limit, and external voltage loop compensation.

Operating Principles: A MAX15588GTL+T typically operates by controlling both the on and off times of a high side power switch through the use of a high speed pulse width modulation (PWM) technique, coupled with a proprietary feed-back compensation circuit. In this way, voltage at the device’s regulated output (Vout) is conveniently adjusted by an external resistor divider. This compensation circuit can significantly reduce the effects of accurate current limit, load/line/temperature disturbances, and step-load transients.

When an output voltage is reduced (e.g., with a reduction in external load currents), the voltage across the switch is increased and the internal PWM drives the switch for a longer time to maintain the output voltage. On the other hand, when the output voltage is increased, the switch off time is prolonged by the feed-forward PWM compensation and higher output currents are allowed to flow.

Protection Features: The MAX15588GTL+T also offers open loop, thermal foldback, and over temperature protection features for increased safety and dependability. The device responds to an open loop condition by observing an error amplifier voltage that is not within one diode drop (about 500mV) of the regulation voltage. This triggers an open loop correction process that increases the duty cycle of the PWM over the maximum range limited by the externally programmed voltage divider ratio.

The thermal foldback feature acts to reduce the amount of energy dissipated (stored heat) in the device when it is operating at high loads. If a programmable foldback temperature is exceeded, the output voltage is gradually reduced until a safe operation is restored. This reduces the amount of heat generated at high loads and ensures the device will not overheat or be damaged.

Finally, the MAX15588GTL+T features an over temperature protection (OTP) system which can be used to prevent device damage or failure due to excessive operating temperature. This protection is set with an external resistor to a temperature of -20C or higher and provides a direct link between the internal IC temperature and its output voltage. If the internal temperature of the device rises above the specified setting, the PWM output voltage is reduced to maintain the same safe operating temperature.

Applications: The MAX15588GTL+T is a highly efficient mono- rail switch mode converter, suitable for a wide range of applications. Its high speed, low quiescent current, and wide input/output voltage range makes it ideal for use in a variety of systems such as 12V battery-powered equipment, low power portable electronics, and AC/DC, DC/DC adapters.

In addition, the device is ideal for precision applications where an accurately sized output current is needed such as lighting, home audio, medical, and automotive systems. Its wide frequency range of 100kHz up to 1MHz makes it suitable for both high-efficiency synchronous rectification and low noise switching regulators.

The MAX15588GTL+T is a versatile and efficient device, making it a great choice for many modern applications. Its features and benefits make the device a great choice for any voltage regulator, power supply, motor control, or lighting application.

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