LTC3829EFE

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

DC-DC switching controllers are regulating circuits used to control the power delivered to a load. By adjusting the switching frequency, they can regulate the output voltage of the DC power source. The LTC3829EFE is a high-efficiency, current mode, step-down switching controller specifically designed for ease of use and accuracy in power management applications. With rich features and a wide range of operating voltages and currents, the LTC3829EFE can provide an optimal power supply design solution.

Introduction

The LTC3829EFE is a current-mode, step-down switching controller designed for use with an external MOSFET for supply-current management in applications such as DC-DC voltage regulation. It offers numerous integrated features that make it easy to design precision voltage-regulator circuits, including integrated programmable overcurrent protection, adjustable frequency, power-good comparator, programmable soft-start, and much more. This device is ideal for portable applications and is suitable for a wide variety of battery-powered and line-powered systems.

Features of the LTC3829EFE

The LTC3829EFE has a wide input voltage range of 4.1V to 21V, is capable of operating up to 1.5A of continuous current, and has an adjustable switching frequency at 0.5MHz to 2MHz and a soft-start programmable up to 1ms. It contains thermal shutdown protection and an adjustable-voltage output range of 0.8V to 90% of the input voltage. An enable input can be used to turn the output off and lockout secondary control signals. With built-in loop compensation for quick and easy compensation, the LTC3829EFE can be used with minimal external components. Additionally, a programmable overcurrent limit is included which helps protect against overcurrent conditions as well as short-circuit events. The LTC3829EFE operates at an internal voltage of 2.5V.

Applications

The LTC3829EFE can be used in a variety of different applications, such as Li-ion, Li-Polymer, NiMH and alkaline battery packs, DC-DC voltage regulation, voltage-tracking converters, fixed and adjustable output voltage sources, portable, handheld and battery powered supplies, and many industrial power systems. Because of its wide input voltage range, it is especially suitable for use in automotive and avionics applications where voltage spikes and noise present on the supply line may be present. In addition, the adjustable frequency and soft-start programmable makes it well-suited for automotive and industrial applications.

Working Principle

The working principle of the LTC3829EFE is based on a fixed frequency, current-mode architecture. A current-mode switch makes use of an internal current-sense circuit instead of a voltage-sense circuit. The control loop is defined by the internal sense resistor, an error amplifier and an external compensation network. In the LTC3829EFE, the switching frequency is user-programmable and is set by the clock divider resistors. When the output voltage is lower than the target level, the error amplifier output increases, increasing the internal current-sense signal. This signal then causes the output duty cycle to increase, leading to an increase in the output voltage. This process continues until the output voltage reaches the target level.

The LTC3829EFE also contains an integrated power-good comparator that signals when the output voltage is within predefined limits. If the output voltage falls outside these limits, the power-good signal will be pulled low. Additionally, the LTC3829EFE contains a thermal shutdown circuit that will turn off the output if the junction temperature goes above a specified threshold.

Conclusion

In conclusion, the LTC3829EFE is a high-efficiency, versatile current-mode, step-down switching controller ideal for a variety of power supply applications, especially in battery-powered and line-powered systems. Its rich feature set and wide range of operating voltages make it a suitable choice for any design requiring an adjustable step-down voltage regulator. With integrated overcurrent protection, thermal shutdown, adjustable soft-start, frequency, and power-good monitoring, the LTC3829EFE is an ideal solution for any power-management application.

The specific data is subject to PDF, and the above content is for reference