LA5756-MDB-E

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The LA5756-MDB-E is a DC DC switching regulator, classified under PMIC (Power Management IC) and voltage regulators. It provides a higher system cost savings, battery life and it is also efficient for its DCDC buck converter. It provides other features such as high current operation, high speed operation and no additional capacitor is needed for a start up. Moreover, the chip has a low ripple characteristics.

The LA5756-MDB-E operates optimally on a single cell Li-ion battery. Its internal operating voltage ranges from 2V to 6V and the chip can accommodate an output voltage up to 5.3V. Also, it has a maximum output current rating of 2A. Additionally, the LA5756-MDB-E has a high switching frequency of 1.2MHz and a wide duty ratio up to 92%. Furthermore, the internal operation temperature ranges between 0°C and 85°C, while the input voltage can range from 2V to 7V.

The application field and working principle of the LA5756-MDB-E is mainly used for power supply design in portable electronics and it is suitable for handheld devices such as mobile phones, digital cameras and media players as well. This chip has become a suitable replacement for cluttered board space compared to traditional linear regulators.

This chip uses pulse width modulation (PWM) in order to control power. The IC accepts an input voltage from 2V to 7V and efficiently converts it to the desired output voltage up to 5.3V with a frequency rate of 1.2MHz. The PWM signal is generated internally by the chip in comparison to other units with external PWM signal input. This chip also can monitor and optimize the efficiency of the output voltage by controlling the duty cycle of the PWM signal. It also uses a slope compensation technique to maintain a fixed frequency switching and prevent forward dropout. Furthermore, the device uses a soft-start function to prevent a quick start-up, often leading to excessive voltage. Its adjustable duty cycle supported by a low standby current and a high efficiency mode of operations ensures it can operate optimally in the environment.

Furthermore, the LA5756-MDB-E features current shaping up to 250mA, this helps reduce surge current, repairing output voltage to a constant value and improve the start-up time. It also features over voltage protection (OVP) to ensure the device does not get damaged due to a voltage spike. It also features a thermal shutdown protection (TSD) to prevent the chip from damage in case of higher power dissipations. To protect from reversed input current, the LA5756-MDB-E is made up of a reverse current protection circuit.

The LA5756-MDB-E package is made up of an 8-pin Wafer Chip Scale Package and requires only one external inductor and an output capacitor for proper and optimum performance. The inductor and the output capacitor used with the device should be chosen carefully to accommodate the input and output voltage ranges. The output capacitor should provide good ESR and ripple characteristics. The inductor should also do the same and should provide a high Q factor with low DC resistance. Also, the device uses a low quiescent current when the output voltage is connected and disconnected.

In conclusion, the LA5756-MDB-E is an efficient and versatile DCDC switching regulator. It can provide a high system cost savings, battery life, high current operation, and high speed operation. It features over voltage protection, current shaping, reverse current protection and a soft start function. It needs only one external inductor and an output capacitor for proper and optimum performance. Thus, its application field includes power supply design in portable electronics, mobile phones, digital cameras and media players.

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