AP2112K-1.2TRG1

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The AP2112K-1.2TRG1 is a linear voltage regulator, a type of power management IC (PMIC). This device is integrated into the design to provide a steady output voltage for an application, regardless of the input voltage fluctuations these applications may encounter, such as fluctuations which arise from a decrease in battery power or the sudden stoppage of an AC power source. The AP2112K-1.2TRG1 is integrated with features such as current protection, output voltage trimming and external components that facilitate a low dropout output voltage.

Features

• 2.8V to 6.5V input operating range
• Output voltage range from 1.20V to 5.50V
• Short-circuit, current-limit and over-temperature protection
• Output voltage accuracy :±1.0%
• Dropout voltage: 40 mV typical @ 800 mA
• Operating Junction Temperature Range: -40°C to 150°C

Application

The AP2112K-1.2TRG1 linear voltage regulator offers low dropout accounting features makes it ideal for use in consumer applications such as digital cameras, cell phones, MP3 players, portable media players, digital set-top boxes, personal computers, notebooks and 2G/3G network infrastructure. It is used to manage system power maintenance, allowing the device to operate while only consuming a small amount of energy. It can also be used to decrease power dissipation.

The AP2112K-1.2TRG1 linear voltage regulator is a monolithic integrated circuit, which means that all the necessary control and voltage monitoring components are housed in a single package. This reduces the physical size of the voltage regulation component, as well as improving component reliability. The AP2112K-1.2TRG1 also offers a high output accuracy rating, making it ideal for applications which require a consistent output voltage.

Working Principle

The AP2112K-1.2TRG1 linear voltage regulator operates by comparing the output voltage of the power supply to an internal reference voltage. It then adjusts its internal output voltage as per its comparison to the reference voltage. The AP2112K-1.2TRG1 utilizes a virtually constant current sensing mechanism. This sensing mechanism is able to provide an accurate comparison of the output voltage compared to the voltage set by the user (which can be set by external or onboard components).

The current sensing circuit works by setting a reference voltage (a set-point) which is equal to the desired output voltage. The changes in the output load current cause changes in the resistance of the sensing element which in turn causes a voltage drop across the sensing element. This voltage drop is then used by the IC to calculate the current and adjust the output voltage by increasing or decreasing the voltage as required. The IC is able to sense the smallest current changes and can thus maintain the output voltage very accurately.

The AP2112K-1.2TRG1 also provides other features such as current protection, output voltage trimming, overtemperature shutdown and short-circuit protection for better protection of the powered system.

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