S-8520A34MC-AVTT2U Integrated Circuits (ICs)

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The S-8520A34MC-AVTT2U is a DC-DC switching controller designed for a variety of power management applications in consumer, industrial, and automotive electronics. It is part of the S-8520A34MC-A series of DC-DC switching controllers from Mitsubishi Electric. This series of ICs features a wide input voltage range of 2.0V to 20V and provides a variety of functions such as basic current limit protection, output voltage adjustment, over temperature protection, low output ripple, and short circuit protection. This DC-DC switching controller also has a frequency of 200kHz and a maximum current of 3.2A.

The S-8520A34MC-AVTT2U is typically used as a step-down (buck) or step-up (boost) converter in a variety of power management applications. It is designed to provide a constant output voltage from a varying input voltage. The device also has a low quiescent current and low EMI (electromagnetic interference) for better system performance. Furthermore, its ability to adjust the output voltage makes it ideal for a range of applications including mobile phones, PDAs, battery operated systems, automotive systems and digital signage.

The S-8520A34MC-AVTT2U operates in three different modes. In PFM (pulse frequency modulation) mode, the device switches continuously and the output voltage is adjusted by adjusting the duty cycle of the switching control signal. In PWM (pulse width modulation) mode, the device switches at a constant frequency and adjusts the output voltage by adjusting the duty cycle. In PSM (pulse skip modulation) mode, the device switches at a constant frequency, but skips pulses at low output load currents to reduce power consumption and reduce high frequency noise.

When the S-8520A34MC-AVTT2U is connected to an external switching transistor, the two components cooperate to create an efficient step down (buck) or step up (boost) DC-DC converter with adjustable output voltage and current limit protection. The output voltage is adjusted using the voltage feedback pin which is externally connected to the voltage divider. The voltage feedback is compared to the voltage reference (Vref) and adjusted accordingly. The current limit at the output is determined by the over current protection (OCP) pin which is connected to a sense resistor at the output. The device also features an enable and reset pin which is externally connected to the enable/reset circuit.

The S-8520A34MC-AVTT2U has a wide operating temperature range of -40°C to 125°C and a wide operating voltage range of 2.0V to 20V. It also has integrating design features like input over-voltage protection, output open/short circuit protection and over temperature protection. This DC-DC switching controller is ideal for a variety of power management applications in consumer, industrial, and automotive electronics.

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