LT8580IMS8E#PBF

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LT8580IMS8E#PBF Application Field and Working Principle

LT8580IMS8E#PBF is a highly integrated DC-DC buck switching regulator or a synchronous buck controller from the PMIC (Power Management ICs) family that belongs to the Voltage Regulators category. It is designed with high efficiency and fast transient response to be used in automotive, consumer and industrial applications.The power switch in LT8580IMS8E#PBF is an ideal synchronous switching device with easy to program current limit, operating frequency and Soft-Start regulation with precise current sensing and thermal shutdown protection. The device also features a 0.8-V gate-drive reference, which is designed to power high-efficiency buck switch designs and it regulates output voltage to a precise fixed voltage. Additionally, the low-current sleep mode of the device allows for a complete power-down for power savings.

Working Principle

The LT8580IMS8E#PBF uses a voltage-mode control scheme where the output voltage is compared against a fixed reference voltage. An on-chip control loop amplifies the difference between these two signals in order to adjust the switching frequency accordingly. This regulated switching frequency controls a high side and low side drive circuit which actuates a N-channel power MOSFET switch.

When the LT8580IMS8E#PBF is initially powered, the Soft-Start circuit is activated which sets the current limit of the switching device and the output capacitor to a preset level. The output should come up to a steady-state level after a few switching cycles. If the output voltage is observed to be dropping suddenly, the device is able to detect the fall in the voltage and respond quickly to the change in loading conditions by adjusting the switching frequency.

The on-chip power MOSFET switch is protected from current overloads and thermal loads due to the current limit and thermal protection. These features are enabled by a real-time monitoring of the switch temperature and current which will alert the circuit to shut down the switch immediately to protect it.

Conclusion

The LT8580IMS8E#PBF DC-DC step-down buck switching regulator is an advanced device that provides high efficiency and fast transient response. It is suitable for automotive, consumer and industrial applications due to its adjustable output regulation, easy to program current limit and Soft-Start feature. The device protects the MOSFET switch by enabling real-time monitoring of the switch temperature and current. This makes the LT8580IMS8E#PBF an ideal choice for DC-DC buck switching regulator in a wide range of applications.

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