LT3680HMSE#PBF

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LT3680HMSE#PBF Application Field and Working Principle

Introduction: LT3680HMSE#PBF is a low voltage, high efficiency synchronous step-down DC/DC converter operating over an input voltage range of 3.2V to 60V, and providing output voltages as low as 0.59V. It integrates a high side N-channel MOSFET, operates in a continuous conduction mode, and works with an internal compensation network. It has many applications in low power systems such as 12V or 24V to 5V/3.3V, automotive and industrial systems requiring high reliability.

Application field: The wide input voltage range and the low output voltage make LT3680HMSE#PBF suitable for operations in many different applications, such as:

• Automotive, industrial, telecom and scientific systems requiring a robust and reliable power supply.
• 12V or 24V to 5V/3.3V conversion.
• High efficiency power supply where low current is needed.
• Systems requiring fast transient response.

Working Principle: LT3680HMSE#PBF DC/DC switching regulators have a regulated output which is regulated by a comparator. The output voltage is maintained as the input voltage fluctuates between its regulation band. This is done by switching the P-channel MOSFET when the input voltage rises above the reference voltage, and by turning it off when it drops below that reference. Additionally, the internal loop incorporates the power up sequence. When the input supply voltage is turned on, the P-channel MOSFET is switched off and current limit is enabled, ensuring that the power up sequence is not disturbed.

The switching frequency of the LT3680HMSE#PBF is programmable by a control pin or an external resistor, allowing for synchronous operations at switching frequencies up to 1.8MHz. The LT3680HMSE#PBF can also operate at 400kHz, providing good efficiencies in light load conditions. The internal soft-start function limits the inrush current during startup, allowing the regulator to start up without creating unwanted noise. In order to reduce the component count within the design, an integrated low RDSON synchronous rectifier is present.

The LT3680HMSE#PBF\'s thermal shutdown circuitry is activated when the die temperature reaches the junction temperature Tj of 150°C. The IC is housed in a small 8-lead DFN package and is available in a typical drop in voltage of 3.3V. It is fully compatible with all standard logic families such as CMOS, TTL, LV/HV, and BiCMOS as well as various power supply applications. It is also compatible with various protection and EMI filters.

Conclusion: The LT3680HMSE#PBF is an ideal solution for a wide range of low voltage, high efficiency step-down DC/DC converter applications, offering low RDSON, high switching frequency, fast transient response and tight regulation at relatively low cost. The LT3680HMSE#PBF offers a reliable and robust design that meets all design requirements in industrial, automotive, telecom and scientific systems where low current is needed.

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