Introduction

The LP3855EMPX-3.3 is an integrated step-down DC/DC converter. It is a member of the Low-Power Buck family of DC/DC converters. This device can be used to accurately regulate the output voltage, while providing very high efficiency over a wide input voltage range and load current range. This device integrates a number of features and functions, including an internal voltage regulator, an internal switch, and an on-board thermal protection circuit. The LP3855EMPX-3.3 is designed to provide a regulated output voltage at up to 3.3V in regulated mode.

Application field

The LP3855EMPX-3.3 is a popular choice for applications that require a high efficiency, low-cost power solution. It is suitable for use in many applications, such as digital multimedia devices, hard disk drives, motherboards, digital video recorders, and cellular phones. This device can deliver an output voltage up to 3.3V. This device is also suitable for use in automotive applications, where power efficiency, low power dissipation and size constraints are key considerations.

Working principle

The LP3855EMPX-3.3 device is a step-down DC/DC converter. It consists of a switching regulator, an adjustable voltage regulator and an on-board thermal protection circuit. At the input of the device, the AC mains voltage is converted to a DC voltage by a rectifier circuit. The DC voltage is then filtered and regulated by the adjustable voltage regulator. The voltage is then applied to the switching regulator, which controls the output voltage and regulates it to the desired level. The internal switch is driven by this control signal. The LP3855EMPX-3.3 also includes a thermal protection circuit, which will reduce the output current to protect the device in the event of an over-temperature condition.