AP7315-26SA-7

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PMIC - Voltage Regulators - Linear, offer a wide range of solutions ranging from cost-effective and space-saving designs to  high-performance and high-security devices. The popular linear regulator, the AP7315-26SA-7, is one of the most commonly used power management integrated circuits (PMIC) in the market. It is a three-terminal fixed output voltage regulator with a wide input voltage range of between 2.2V to 6V, a low dropout voltage of just 0.8V and an adjustable output voltage up to 5.5V. It is an ideal power management solution for a variety of applications.

Features of the AP7315-26SA-7

The AP7315-26SA-7 is a very popular regulator from a leading PMIC manufacturer with many advantages, including:

• High ESD performance
• Low quiescent current: 80uA (typical)
• High input voltage range: 2.2V to 6V
• Output voltage adjustable up to 5.5V
• Low dropout voltage of just 0.8V
• Short-circuit and overload protection circuitry
• Open load detection
• Frequency hopping frequency: 2MHz
• Advanced load line control
• Low operating temperature

Application Field of the AP7315-26SA-7

The AP7315-26SA-7 linear regulator is widely used in many different applications such as:

• System power supply
• Battery-powered equipment
• Notebook computers and tablet PCs
• High-efficiency audio amplifiers
• Battery chargers and power adapters
• Automotive electronics
• Industrial applications

The regulator is also suitable for adjusting, filtering, and regulating the voltage in automotive, communications and industrial applications. This can be drastically improved over conventional linear regulators, eliminating the need for heat sinks and achieving high efficiency.

Working Principle 1 of the AP7315-26SA-7

The working principle of the AP7315-26SA-7 linear regulator is based on the input, feedback and control loop structure. The input side connected to the input voltage source is compared with the voltage divider by the built-in voltage reference IC and the output side. According to the error signal, the output voltage of the linear regulator is adjusted by the operational amplifier, and the closed-loop regulation can be obtained by repeating the adjustment action.

The frequency hopping frequency of the AP7315-26SA-7 is 2MHz, which can make the response frequency range of the device cover the entire audio band. The high frequency ensures more stable performance and can avoid unwanted noises caused by low frequency interference. The transfer function of the AP7315-26SA-7 is controlled by the voltage feedback loop and is composed of the GAIN, error amplifier, compensation network and output pass Transistor (FET).

Working Principle 2 of the AP7315-26SA-7

The AP7315-26SA-7 is equipped with a built-in advanced load line control circuit which is designed to reduce output voltage variations due to sudden load changes. It assists in load line control to stabilize output voltage and reduce output voltage fluctuation. This is done through improved gain, over-current and short-circuit protection to ensure a safe and reliable power supply.

The circuit implements overcurrent protection through constant-current control. When the output current exceeds the preset limit, the control circuit will reduce the voltage limit to avoid excessive current. When the current is below the limit, the voltage will be increased automatically to ensure the output voltage stability. When the output current reaches to overload level, the circuit will be overdrawn and the output voltage will be cut off.

The AP7315-26SA-7 also offers a very useful shutdown feature. When an open load is detected, the regulator will turn off, allowing the user to identify the fault quickly.

Conclusion

The AP7315-26SA-7 linear regulator is one of the most popular PMICs in the market today, offering a wide range of features and benefits. It is suitable for a broad range of applications and provides an extremely efficient and reliable power management solutions. Its advanced load line control and built-in protection circuits ensure a safe and secure operation with improved efficiency, making it a must-have for any design.

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