LT3689IUD-5#TRPBF

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LT3689IUD-5#TRPBF Application Field and Working Principle

PMIC (Power Management Integrated Circuits) remains the key technology to manage electrical energy in devices of all shapes and sizes. The LT3689IUD-5#TRPBF by Linear Technology is one such example. It is a registered DC-DC switching regulator optimised for power processing and energy control applications, and falls under the category DC DC Switching Regulators.

A closer look at the LT3689IUD-5#TRPBF reveals a wide range of features in this device which make it very suitable, or even ideal, for use in applications such as simple switchmode power supplies, datadisplay power processing systems, and many more related applications. It features a wide input voltage range of 4.5V to 42V, low dropout operation and a very efficient switching system that delivers over 95 percent efficiency with the selection of external components.

Features

The LT3689IUD-5#TRPBF has many features of particular interest to users. The device can operate from either a fixed output voltage or directly program a variety of switch and time constants to give the user complete design flexibility. Furthermore, the device contains soft-start, skip mode and burst mode strobe functions which reduce output ripple at light load current by reducing switching frequency and the driven components.

The device also has a wide operating temperature range of -40°C to +85°C and is capable of supplying up to 3A of output current. It includes current sensing functionality, a high frequency PWM comparator, and a high speed power switch. These features, together with its good ripple rejection, reduce the external components count, thereby making the total solution cost lower.

Working Principle

The LT3689IUD-5#TRPBF by Linear Technology is a voltage regulator that employs a constant-frequency, current-mode topology. This type of control is considered as the most popular technique to generate an accurate, low ripple, stable output voltage and carries nearly all the necessary characteristics to fulfill the stringent requirements of voltage regulation.

The LT3689IUD-5#TRPBF controller circuitry consists of a comparator, a latch and an oscillator. The oscillator produces a triangle waveform which is compared with the voltage across a current-sense resistor. When the input voltage is greater than a preset threshold that is developed across the resistor, the comparator sets the latch which turns on the power switch for a fixed period of time. During this period, the inductor current increases to the fixed peak current and the output is generated. When the power switch is turned off, the current from the inductor starts to decay and creates an output voltage across the output capacitor. This continues for the next cycle and maintains a steady state output.

Conclusion

The LT3689IUD-5#TRPBF is a very reliable and efficient DC-DC switching regulator with a wide range of features that make it suitable for many power processing and energy control applications. Its wide input voltage range and low dropout operation make it a great solution for many complex power-related tasks, while its simple design and the ability to program various switch and time constants make the device very easy to use. Furthermore, the LT3689IUD-5#TRPBF has current sensing and protection features, skip mode and burst mode strobe functions and provides over 95 percent efficiency with the choice of external components.

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