AN30181A-VL Integrated Circuits (ICs)

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AN30181A-VL voltage regulator is a type of DC-to-DC linear and switching voltage regulator (PMIC). The device features a low dropout voltage, fast transient response, undervoltage lockout protection, adjustable output current limiting protection, and overvoltage protection. It also features short-circuit protection, thermal shutdown protection, and remote voltage sensing capability.

The AN30181A-VL voltage regulator is a monolithic IC, incorporating a high-efficiency step-down converter with a high maximum current limit of 800mA. Operating from inputs up to 24V, it can provide regulated outputs from 2.5V to 24V in 1V steps. The output voltage can be adjusted with an external resistor divider network. The regulator has an adjustable constant on-time control (COT) architecture to minimize part count, optimize size, and reduce external component requirements.

The AN30181A-VL voltage regulator has a high-side driver, current sense, and a dynamic input comparator to rapidly sense the duty cycle of the device and respond to changes in the duty cycle as they happen. This enables the voltage regulator to dynamically adjust its duty cycle to accurately regulate the output voltage. The device also features a maximum duty cycle limit of 70%.

The output voltage is regulated using an internal error amplifier for voltage feedback. The voltage sense amplifier is designed for both remote and non-remote sensing. Remote sensing compensates for the voltage drops along long power supply lines and allows for accurate regulation of the output voltage. The closed loop regulation control is fast with a high-frequency line compensation and topology that ensures fast dynamic load transients.

The AN30181A-VL voltage regulator also has an undervoltage lockout (UVLO) protection circuit. This circuit is triggered during the start-up after the powers-up sequence and keeps the device disabled until the input voltage reaches the UVLO threshold. UVLO is also used to protect the device from getting accidentally disabled under heavy-load transient conditions.

The device also has overvoltage, short-circuit, and thermal-shutdown protection. Overvoltage protection (OVP) ensures the input voltage does not exceed the maximum voltage rating of the regulator. The short-circuit protection limits the maximum output current to prevent the device from being damaged when a short circuit is detected in the output load. The thermal-shutdown circuit prevents excessive temperature buildup in the device caused by prolonged operating conditions.

In summary, the AN30181A-VL voltage regulator is a high-efficiency DC-to-DC linear and switching voltage regulator with adjustable output current limiting protection, undervoltage lockout protection, overvoltage protection, short-circuit protection, and thermal shutdown protection. It can be used in many applications such as power supplies for consumer electronic devices and automotive applications. With its wide operating range and fast transient response, it is an ideal choice for a reliable switching power supply design.

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