LTC3112MPFE#PBF

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LTC3112MPFE#PBF Application Field and Working Principle

The LTC3112MPFE#PBF is a DC/DC switching regulator belonging to the PMIC – Voltage Regulators – DC DC Switching Regulators family. It is an ideal solution for high-efficiency, low noise and low output voltage regulation. The LTC3112MPFE#PBF is designed for microprocessor (MPU) or digital signal processor (DSP) power supplies and has adjustable frequency, high efficiency, and low quiescent current, designed for operation from a 5 V input. Its 3.3 V or 5 V regulated output can be used for the power rail or I/O of the processor.

In order to provide maximum efficiency and flexibility, the LTC3112MPFE#PBF uses a synchronous buck topology, in which both the high- and low-side power switches are external power MOSFETs. This allows for higher efficiency than typical non-synchronous buck regulators, since it eliminates the need for diode rectification. The LTC3112MPFE#PBF also features a unique current mode architecture that allows the device to remain stable with a wide range of output capacitors. The switching frequency of the device can be adjusted by external resistor, allowing the use of small, low-cost components.

The LTC3112MPFE#PBF is designed for operating efficiency, with a typical efficiency of 90 percent at full load, improving to over 95 percent at lighter loads. It also offers low-noise operation with a high PSRR (power supply rejection ratio) and low output voltage ripple. The device also features cycle-by-cycle current limit protection, independent soft-start, dynamic headroom and overtemperature protection.

The output voltage of the LTC3112MPFE#PBF is set by an external voltage divider. Once the voltage is set, the device automatically maintains the output voltage without further adjusting. The output voltage can be set in the range of 0.8 V to 5.5 V.

The LTC3112MPFE#PBF is also designed for operation under maximum dynamic load conditions, 10 kHz to 300 kHz frequency range, 0.47 μA – 1.2 A current output range, 0.83 μA – 3 A current input range, 1 V minimum start up voltage, 0.8 V maximum output dropout voltage and 10 μs for output response.

In summary, the advantages of the LTC3112MPFE#PBF include high efficiency, low noise, adjustable frequency, low quiescent current, adjustable output voltage, high PSRR, low output voltage ripple and protection features. All these features make the LTC3112MPFE#PBF the ideal choice for high-efficiency, low noise and low output voltage regulation.

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