AP1117K33L-U

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The AP1117K33L-U is a Voltage Regulator in the Linear category of Power Management ICs. It is a low-dropout (LDO) linear regulator with an output current capability up to 1.2A. The AP1117K33L-U operates over an input voltage range of 2.9V to 5.5V and has an adjustable output voltage range of 1.2V to 3.6V. The key features of this device include a maximum voltage dropout of 200mV at 1A, a 0.4% line regulation and 0.4% load regulation for better output voltage accuracy, a fast transient response time of 20μs, reverse current protection, soft-start to limit inrush current, built-in thermal shutdown protection, and a logic-controlled shutdown mode.

The AP1117K33L-U is suitable for a wide range of portable electronics powered by a single cell battery, such as MP3 players, digital cameras, PDAs, cellular phones, and personal digital assistants (PDAs). It can also be used to provide power supply for low current applications in handheld equipment, such as LCD displays and Bluetooth modules.

The AP1117K33L-U works by taking in an input voltage and regulating it to a fixed output voltage based on a reference voltage. The AP1117K33L-U contains an error amplifier to compare the output voltage to the reference voltage and generate a difference signal. An internal P-channel MOSFET is used to regulate the output voltage in response to the difference signal. When the output voltage drops, the MOSFET turns on, creating an increased current flow from the input to output, thus regulating the output voltage to a given set point.

The AP1117K33L-U also features bi-directional current flow protection, which prevents the device from being damaged due to reverse current. This feature sets the P-channel MOSFET to an OFF state when an output-to-input current flow is detected, thus protecting the device from potential damage. Additionally, the device includes an integrated soft-start circuit which helps limit inrush currents. This feature sets the output voltage slowly over a defined time period when the device is enabled and limits the sudden spike in current experienced during startup. The device also includes a logic-controlled shutdown mode, providing a shutdown control pin that enables slow ramping up and down of the output voltage to prevent excessive power dissipation and inrush currents during startup. The device also has built-in thermal shutdown protection to prevent the device from overheating.

Overall, the AP1117K33L-U offers an adjustable output voltage range of 1.2V to 3.6V, a 200mV maximum dropout voltage at 1A load current, 0.4% line and load regulation for improved output voltage accuracy, a fast transient response time of 20μs, bi-directional current flow protection, soft-start, thermal protection, and logic-controlled shutdown mode. These features make it an ideal solution for low current applications in portable electronic devices and handheld equipment.

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