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PMIC - Voltage Regulators - DC DC Switching Regulators

LTC3631EMS8E#TRPBF is a low-power DC/DC synchronous step-down switching regulator with a wide 4.75V to 32V input voltage range and up to 2A continuous output current. It is designed using an advanced MOSFET topology and has an operating quiescent current of only 15µA. Features include an enable pin, two selectable operating frequencies, programmable soft-start, and accurate output voltage regulation, making it an ideal choice for portable applications, battery powered systems, and power-sensitive consumer products.

The advanced MOSFET topology enables LTC3631EMS8E#TRPBF to produce higher efficiency and operation stability by greatly reducing the ripple, noise and EMI noise levels. Additionally, advanced on-chip control circuit ensures excellent line/load/temperature regulation, while the highly accurate potential-sharing technology provides an accurate current-sharing operation at up to 2A output current.

Designed with a compact package and an on-board power switching device (Power MOSFET), LTC3631EMS8E#TRPBF offers a high level of integration for low-profile and space-limited applications, such as battery-powered systems, handheld electronics, mobile phones, and embedded systems. This device is also embedded with a wide range of features that provide a high level of system flexibility, including adjustable soft-start, programmable output voltage, and two selectable switching frequencies (450kHz/925kHz).

Application Fields

LTC3631EMS8E#TRPBF is used for a wide range of current and voltage regulating solutions, in battery-powered systems, handheld devices, and many other applications. Its 4.75V to 32V wide input voltage range and its 2A peak output current capability make it suitable for a variety of applications.

Due to its low quiescent current of only 15µA and its highly efficient operation, LTC3631EMS8E#TRPBF is ideal for portable and power-sensitive applications. Furthermore, this device offers a wide range of features, including adjustable soft-start and selectable switching frequencies, making it flexible for applications requiring a higher level of system performance.

LTC3631EMS8E#TRPBF is also suitable for automotive applications, due to its wide temperature operating range (up to -40°C to 125°C) and its excellent EMI performance. It is also capable of accurately regulating the output voltage and current over a wide range of conditions, making it an ideal choice for automotive systems, such as engine control units (ECU), safety electronics and power management systems.

Working Principle

LTC3631EMS8E#TRPBF is designed using a switched-mode step-down DC/DC converter architecture, and operates in a continuous conduction mode (CCM). This architecture consists of two major components: an inductor, and a power MOSFET switch. It works by controlling the switching frequency and duty cycle of the MOSFET switch to regulate the output voltage.

Power is supplied to the input side of the device, where it is stepped down to the desired voltage level by the DC/DC converter. The output voltage is then regulated through the control of the switching frequency, the duty cycle and the peak inductor current, in order to maintain the desired voltage level. This architecture enables LTC3631EMS8E#TRPBF to operate with high efficiency at light loads, as well as high power outputs.

Furthermore, through the implementation of synchronous rectification, LTC3631EMS8E#TRPBF can achieve higher efficiency at higher load currents. Synchronous rectification works by replacing the traditional Schottky rectifier with a power MOSFET switch, which helps to reduce the conduction losses of the switch by utilizing the body diode effect. This helps to improve the overall efficiency and minimize power losses, allowing for a high level of current and voltage regulation.

Summary

LTC3631EMS8E#TRPBF is a low-power DC/DC synchronous step-down switching regulator designed using an advanced MOSFET topology. It offers a wide 4.75V to 32V input voltage range and up to 2A continuous output current and is suitable for a variety of applications. It has a low quiescent current of only 15µA and features selectable operating frequency and programmable soft-start. It is an ideal choice for battery-powered systems, handheld devices, and other power-sensitive consumer applications.

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