LT1374CR-SYNC#TRPBF

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The LT1374CR-SYNC#TRPBF is an integrated switching regulator, designed for creating high efficiency low power DC-DC converters. An integrated regulator is essentially a specialized integrated circuit (IC) which functions as the main control unit for power regulation. It takes one voltage signature, usually from a power supply, and processes it to output a regulated DC voltage. The LT1374CR-SYNC#TRPBF is an example of an integrated regulator, with various features and functions which make it an ideal choice for applications requiring a high-efficiency, low-power DC-DC converter.

Application Field

The LT1374CR-SYNC#TRPBF integrates a Pulse-Width Modulation (PWM) controller and drivers, operating at 500kHz, to create a synchronous buck converter in a single package. It is capable of regulating output voltages of 2.5V, 3.3V or 5V (selectable externally) with a ±0.5% accuracy. Its active current setting gets input from 2-pin REFIN and REFINM pins and allows output currents of up to 1A. The maximum power dissipation is 1.5W and its maximum input voltage range is 18-36V.

The LT1374CR-SYNC#TRPBF can be used in many applications such as creating circuits for digital cameras, personal media players, Bluetooth headsets, smart phones, and other portable products. It is also suitable for creating multiple output supplies for microprocessors, DSPs and other digital ICs.

Functionality

The LT1374CR-SYNC#TRPBF offers several features for creating high efficiency, low power DC-DC converters. The integrated PWM controller provides fixed frequency operation with current mode control. It has an adjustable switching frequency of 200kHz to 500kHz and can synchronize to an external reference. Its integrated power MOSFETS eliminates the need for an external drive, saving components and board space. The included short circuit protection reduces component damage and avoids opto-couplers. Furthermore, its dynamic response helps to maintain a minimum output voltage during peak demands.

Further features enable users to customize their converter design, providing high efficiency and performance. The LT1374CR-SYNC#TRPBF includes an adjustable soft-start time, allowing users to set the power supply to their preferred levels. It also has an adjustable switch resistance for adjusting the output voltage and improving efficiency. An on-time limitation function protects against excessive switching from reflected ripple caused by heavy loads. Moreover, its cycle-by-cycle current limiting and adjustable under-voltage lockout protects users from overload.

Working Principle

The LT1374CR-SYNC#TRPBF relies on current mode control and uses a long time constant network to provide the average output current. In operation, an internal voltage reference is compared to the voltage on the REFIN pin and the resulting difference is amplified. This error voltage is converted to current and used to decide when to turn the output power MOSFETs on and off. On each cycle, the voltage across the inductor is clamped to the output voltage and the current is regulated. A linear regulator is used to control the output voltage.

The LT1374CR-SYNC#TRPBF is a highly versatile regulator, capable of regulating output voltages of 2.5V, 3.3V or 5V with a ±0.5% accuracy. Its regulation circuit combines several features, allowing users to customize their converter design to suit their application’s specific requirements. By utilizing the LT1374CR-SYNC#TRPBF, users can create a high-efficiency, low-power DC-DC converter suitable for use in many applications

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