LTM4630IV#PBF

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DC/DC converters are essential components for the regulation of electrical power within diverse applications since it allows direct current to direct current (DC/DC) or alternating currents (AC-DC) conversion, allowing the operation of a wide array of electronic components in both portable and stationary devices. The LTM4630IV#PBF is a DC/DC converter created by Linear Technology, used in applications that require very low input voltage regulation. It is a cost effective solution for applications such as IoT, wearables, and smartphones.

The LTM4630IV#PBF is a 4.5V to 30V, 4A buck converters with a step-down (buck) topology. This converter operates with input voltage up to 30V and provides an output current up to 4A. This product utilises a pulse-width modulation architecture that is synchronous with the input voltage. The LTM4630IV#PBF also boasts a fixed frequency of 2.25MHz with pin selectable frequency options of 1.1M, 1.25M, and 2.25M.

It is designed with the efficiency of a switching power supply while operating with energy losses similar to a linear power supply. This is achieved via high frequency, constant frequency switching and is also well regulated due to the integrated low dropout linear regulator. This allows a minimum input voltage requirement of 3.4V for a 0.5V output voltage.

The design of the LTM4630IV#PBF allows for advanced current sharing between multiple converters in applications that require higher power requirements. Current sharing is made possible by an integrated loop comparator inside the converter, with a threshold of 200 mV of output ripple. This maintains a ±1% tolerance accuracy of the output voltage.

The device also contains PWMing for dimming of LED applications. It is designed with three open drain, N-MOSFETS that are PWM dimmable and one open drain, N-MOSFET indicator. The indicator output is designed with a voltage of 3.3V and 0.1V hysteresis for over-voltage and under-voltage protection. Linear Technology has also designed the device with a 3.3V output reset signal, and a RESET input with hysteresis of 0.8V to 3.3V.

The LTM4630IV#PBF converters have a wide variety of features and protection mechanisms to ensure reliable operation. These include UVLO (under-voltage lockout) with hysteresis, a thermal shutdown temperature of +150°C, over-current protection and a short-circuit protection with automatic recovery. Additionally, the LTM4630IV#PBF is designed with internal loop compensation, eliminating the need for an external timing capacitor.

In conclusion, Linear Technology’s LTM4630IV#PBF is a highly versatile DC/DC converter with impressive features that prioritize reliability, efficiency, and advanced protection mechanisms. The device has the capability of providing an output up to 30V while operating with minimal input voltage requirements. It is also designed to be integrated with advanced current sharing capabilities and PWN outputs for dimming of LED applications. The LTM4630IV#PBF is an ideal choice when considering DC/DC converters with minimal power requirements.

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