LM2853MH-1.8

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LM2853MH-1.8 Application Field and Working Principle

The LM2853MH-1.8 is a DC-DC switch regulator designed to provide a wide input voltage range applications including mobile phones, personal digital assistants and digital cameras. This step-down regulator features a low-RDS(ON) internal power switch, a switching frequency of up to 1.8 MHz, low quiescent current operating over temperature range, and protection features such as output over-voltage, thermal, and under voltage lockout detection.

The LM2853MH-1.8 belongs to the category of DC-DC Switching Regulators. It features a 3-A, low-RDS(ON) internal power switch with a switching frequency adjustable from 150 kHz to 1.8 MHz. The device also integrates a low quiescent current pulse-width modulation (PWM) control scheme.

The LM2853MH-1.8 is used to regulate the voltage supplied to a load. During normal operation, the device functions as an adjustable switching regulator, providing a regulated output voltage while rejecting input supply transients. During start-up, the LM2853MH-1.8 works as a start-up regulator which supplies the output voltage proportional to the input supply voltage. The protection features provide circuitry for output over-voltage, thermal and under voltage lockout protections.

At its core, the LM2853MH-1.8 is a switching regulator driving an integrated output power switch in an array of configurations. The device provides a regulated source of power to a load, while maintaining the input voltage within its limits. The device is capable of receiving the input reference voltage from the load itself, allowing the device to track the output voltage and provide a constant output voltage regulation. The device can be used in applications required up to 5A load.

In addition, the LM2853MH-1.8 has an adjustable minimum on-time (TMIN) setting feature to ensure that the output transistor is not forced to operate during light load condition. This feature keeps the device in a stable condition, without affecting the overall power efficiency of the converter.

Futhermore, the device is capable of providing a wide input voltage range from 3.3V to 60V. This feature allows the device to be used for a wide range of applications, such as DC/DC and AC/DC battery charging, automotive alternators, and industrial power supplies.

In conclusion, the LM2853MH-1.8 is an ideal choice for applications requiring a wide input voltage range and excellent load regulation. The device is designed with load current monitoring and protection features, giving designers more flexibility and assurance when designing their applications.

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