LTC3624HMSE#PBF

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The LTC3624HMSE#PBF from Linear Technology is a synchronous step-down switching regulator that is equipped with all necessary components for a complete, high efficiency, low noise DC/DC switching regulator power supply. The device requires only a minimum of external components for operation and features low operating current, low heat dissipation,and high efficiency. This makes the LTC3624HMSE#PBF ideal for use in applications such as portable electronics, battery-powered devices, and automotive systems.

Features

The LTC3624HMSE#PBF is a monolithic synchronous step-down switching regulator that operates with input voltage ranging from 4.5V to 21V and can supply an output current up to 4A. This device also features short-circuit and thermal protection, an adjustable output voltage, a configurable switching frequency, and a soft-start voltage ramp. The LTC3624HMSE#PBF also features an adjustable power-good output that indicates the presence of output voltage.

Application Field

The LTC3624HMSE#PBF is well suited for a wide range of applications such as embedded industrial systems, automotive systems, telecommunication equipment, and computer peripherals. It can also be used for powering wireless LAN, Bluetooth, and Wi-Fi applications. Furthermore, this device is also suitable for powering high-performance LED drivers, AC adapters, and other portable devices that may require a power-efficient, low-noise power supply.

Working Principle

The LTC3624HMSE#PBF is designed to operate in step-down mode and can reach a high level of efficiency throughout its input and output range. The device works by converting the input voltage to a higher output voltage, which is determined by the external voltage control resistor. The internal switching frequency of the device is adjustable between 400kHz and 2.2MHz, and it can be programmed by connecting a resistor to the FB pin. The device is equipped with a synchronous rectifier to reduce power consumption, and a low dropout voltage regulator to maintain maximum efficiency when the output current is low.

The power MOSFETS of the LTC3624HMSE#PBF are controlled by an internal oscillator, with the duty cycle of the switching controlled by the feedback voltage. The output regulation is improved with the addition of a programmable soft start, which will ramp up the output voltage over time. The device features a power good output for monitoring the output voltage, and a thermal shutdown circuit for protection in overtemperature conditions.

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