LM1117MP-2.85/NOPB Integrated Circuits (ICs)

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The LM1117MP-2.85/NOPB is part of the linear voltage regulator family in PMIC – Voltage Regulators. It is a low-dropout voltage regulator that provides an accurate output voltage of 2.85V with a maximum dropout of 1.5V. The device has a wide range of input voltage between 2.7V – 10V and is ideal for battery-operated applications due to its low quiescent current.

The integrated fields-effect power transistor allows the device to deliver up to 1A at output voltage as low as 2.5V. The output current is also adjustable via a resistor divider network applied to the adjustment pin. The device has excellent line and load regulation, with a maximum variation of 2%. This prevents the IC from prone to thermal runaway or overshoot, allowing the IC to provide stable output voltage.

The LM1117MP-2.85/NOPB also features short-cycle protection and current-limiting. This helps protect the device from damage due to electrolytic capacitor disturbances and over current conditions. The device also offers some thermal protection, allowing the part to keep in safe operating conditions even in extreme thermal environments. Other features available are current-limit-response, reverse-voltage, and short-circuit protection.

The working principle of the LM1117MP-2.85/NOPB is based on a linear regulator. It is a simple circuit topology consisting of a pass transistor, error-amplifier, and feedback amplifier. The pass transistor controls the output current. An internal reference voltage Vref, set by the device, is compared to the output voltage via a voltage divider network. When the output voltage is lower than the reference voltage, the error amplifier’s output increases thereby driving the pass transistor in a positive direction increasing the current through it. This in turn increases the output voltage until it reaches the set reference voltage.

In summary, the LM1117MP-2.85/NOPB is a versatile and efficient low-dropout voltage regulator from the PMIC – Voltage Regulators – Linear category. It supports a wide range of input voltage ranges to provide an accurate output voltage and is designed to protect the device from thermal runaway and over current conditions. The device utilizes a simple linear regulator topology to provide stable output voltage.

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