LTC3646HDE-1#PBF

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The LTC3646HDE-1#PBF is a dual output, regulated step-down DC/DC converter designed for automotive, industrial and consumer applications. This high efficiency device features a low quiescent current of only 24 mA and is capable of regulating two different output voltages from a common input each with a maximum rated output current of 2.5A. It also includes a unique adaptive operating frequency that optimizes efficiency, EMI and size of inductors and capacitors.

The LTC3646HDE-1#PBF is ideal for automotive applications that require a highly integrated and efficient power supply. Its design is optimized for the 3.3V/1.8V and 5V/2.8V dual output combination and is supplied in a 6-pin SOT-23 package. It is also available in 8-lead MSOP and 8-lead DFN packages.

Application Field and Working Principle

The LTC3646HDE-1#PBF is a highly integrated switching voltage regulator for DC/DC conversion. It combines two efficient step-down converters in one 6-pin SOT-23 package. The two channels have separate input and ground pins and share the same SW pin which is the output of a single internal power switch.

The application fields for the LTC3646HDE-1#PBF are very wide. It can be used in industrial, consumer and automotive applications to provide dual output voltage from a common input. Some typical applications include automotive cameras, batteries, displays and similar.

The working principle of the LTC3646HDE-1#PBF is simple. When a voltage is applied to the input pin, it passes through an internal power switch (usually an N-channel MOSFET) that pulses at a frequency set by the internal linear regulator and is regulated by internal voltage regulators. This pulsed voltage is then fed through two inductors and two Schottky diodes to two separate outputs. The output voltage of each output can be programmed using two resistors, with a maximum voltage of 5V.

The LTC3646HDE-1#PBF also features various protective functions. It has an under-voltage and over-voltage lockout (UVLO) with an adjustable detection level and a power-on reset for each channel. It also includes over-temperature protection and current limit protection, which shuts off the internal power switch in case of an overload.

The LTC3646HDE-1#PBF also features an adaptive operating frequency that can be set using external resistors. This feature enables optimized efficiency, EMI and size of inductors and capacitors, making it an ideal choice for fast, efficient power delivery and no-worry start-up.

Conclusion

The LTC3646HDE-1#PBF is a dual output step-down regualted DC/DC converter designed for automotive, industrial, and consumer applications. It is optimized for the 3.3V/1.8V and 5V/2.8V dual output combination and features a low quiescent current of only 24 mA. It also includes a unique adaptive operating frequency that optimizes efficiency, EMI and size of inductors and capacitors. The LTC3646HDE-1#PBF is the ideal choice for automotive and other applications that require a highly integrated and efficient power supply.

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