LTC3615HFE-1#PBF

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The LTC3615HFE-1#PBF is classified as a PMIC (Power Management Integrated Circuit) that specializes in Voltage Regulators and DC DC Switching Regulators. This type of power management IC is used to convert one voltage level to another and provides a regulated output. Understanding the application field and principles of operation for the LTC3615HFE-1#PBF can help engineers select the best power management solution for their engineering design application.

Application Field

The LTC3615HFE-1#PBF is designed for use as a Synchronous Switching Regulator, also known as a Synchronous Buck Converter, in power supply applications. It is a two-phase design that the system designer can program to operate at a single phase or two-phase dimming, allowing the designer to precisely dial-in the output voltage and current of the system. It offers current sharing feature which consists of an MOSFET driver with an over-current protection and a separate pin connected to the current sense amplifier for accurately sensing the load current of each phase.

This IC synchronizes with an external clock and offers accurate, low noise conversion from a 5V to 3.3V, 5V to 2.5V and 5V to 1.8V output voltage range with a wide range of switching frequencies. It also allows the designer to program levels of control signals, like dimming levels, PWM duty cycle and soft-start, via external resistors, minimizing system component cost and size-footprint.

The LTC3615HFE-1#PBF operates with an input voltage range from 4.5V to 42V and a typical output current of 4A (5A at 25°C with adequate heat sinking) and is rated for up to 6A continuous output current with heatsinking. The high power density and efficiency of up to 95% makes the LTC3615HFE-1#PBF suitable for many power supply applications in telecom, communication, and medical equipment as well as PC, notebooks and industrial control.

Working Principle

The LTC3615HFE-1#PBF is a two-phase buck converter and the block diagram illustrates all the necessary components including synchronous rectifiers, power switches and current sense amplifier. The two-phase, interleaved buck configuration provides a higher switching frequency and reduces input capacitance while allowing the system designer to easily set the output voltage by adjusting the external reference voltage. The two-phase architecture divides the input current between the two phases, doubling the output current and reducing ripple current at the source.

The LTC3615HFE-1#PBF uses a pair of interleaved P-channel MOSFET synchronous rectifiers which reduces the ripple current in the output capacitor and increases the power efficiency of the system.

The output voltage is accurately regulated by a voltage feedback loop and its mode of operation is configured by the external Sync Filter capacitor and the RT/CT resistor network which determines the external reference voltage. The voltage error amplifier adjusts its output according to the external reference voltage to control the duty cycle of the power MOSFETs.

The LTC3615HFE-1#PBF features an integrated under-voltage rather than a traditional enable/disable input to prevent the controller from running when the output voltage is below the acceptable level. It also contains short-circuit protection and thermal shutdown which shuts down the device when the junction temperature exceeds a predetermined limit. Additionally, the current sense amplifier measures the output current of each phase and can circuit share the output current with other devices. This helps control the output current of multiple buck regulators accurately while allowing simpler paralleling of multiple devices.

Finally, the LTC3615HFE-1#PBF offers a large array of digital interface options including SYNC Sig, SYNCIN/SYNCOUT, SYNCFLT and FAULT to allow for external synchronization and protection.

Conclusion

The application field and working principles of the LTC3615HFE-1#PBF have been discussed to help engineers select the best power management solution for their engineering design application. This PMIC is optimized for use as a Synchronous Switching Regulator, providing a higher switching frequency, lower input capacitance, lower ripple current and improved power efficiency for Applications in telecom, communication, medical equipment as well as PC, notebooks and industrial control.

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