LTC3891MPFE#PBF

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The LTC3891MPFE#PBF is a DC-DC switching regulator control IC designed for high-performance, synchronous step-down applications. It is a member of the family of Switch-Mode Power regulators that use a fixed frequency architecture to meet the demands of designs such as hot-swap and point-of-load (POL) applications that require the highest efficiency and small solution size.

In terms of application field, the LTC3891 can be used as a PMIC (Power Management Integrated Circuits) in applications ranging from 12V down to 0.6V, with output voltages adjustable as low as 0.5V. The LTC3891 is ideal for use in automotive, telecom and industrial applications that require a power density of 1W/mm2 and greater efficiency at low output currents.

In terms of working principle, the LTC3891 uses a phase-lock loop (PLL) to synchronize the SR (switching regulator) frequency to an external clock signal. The switching frequency can be adjusted from 200kHz up to 1MHz to optimize efficiency and reduce solution size. The PLL provides jitter-free switching for maximum efficiency and noise-free operation.

The LTC3891 also has integrated MOSFET drivers, variable frequency operation, and low noise current mode operation. The low power standby mode allows for maximum efficiency in battery powered applications. The PLL can be programmed to adjust the switching frequency according to the required loading conditions.

Other features of the LTC3891 include an adjustable soft-start, an accessory detection output, a fault protection circuit, and a temperature protection circuit. The LTC3891 also features a voltage surface-mount package and is temperature independent, which makes it ideal for a range of applications.

In summary, the LTC3891MPFE#PBF Voltage Regulator is a DC-DC switching regulator control IC designed for high-performance, synchronous step-down applications. It is suitable for applications ranging from 12V down to 0.6V and has a power density of 1W/mm2 and greater efficiency at low output currents. The LTC3891 features a phase-lock loop (PLL) to synchronize the switching frequency, integrated MOSFET drivers, variable frequency operation, low noise current mode operation, adjustable soft-start, an accessory detection output, a fault protection circuit, a temperature protection circuit, and a voltage surface-mount package.

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