AP7313-15SAG-7

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The AP7313-15SAG-7 is a linear voltage regulator (LVR) belonging to the family of integrated power management integrated circuits (PMICs). It is used to regulate the voltage of a system by providing a low-accuracy constant output voltage to a load characteristic. This article will discuss the application field and working principle of the AP7313-15SAG-7.

The AP7313-15SAG-7 is a low dropout regulator (LDO) suitable for post-regulation applications. It was designed to operate as a linear regulator in battery-powered electronics, such as mobile phones and tablets, and can be used as a constant-current or constant-voltage regulator. Furthermore, the device can act as a current-limiter for single-cell Li-ion powered applications. Due to its high load current capacity, the device is also suitable for use in power supply circuits, such as battery backup systems.

The AP7313-15SAG-7 is a non-slew-type device and its input voltage range is 2.7V to 6V. It provides an adjustable output voltage ranging between 1.7V - 5.5V with an accuracy of ±2%. The device also offers a low dropout voltage of 150mV and a high input voltage range. In addition, it offers an enable function that can be used to improve system standby current consumption. The device features over-current and overtemperature protection, making it a reliable and robust solution for post-regulation applications.

The AP7313-15SAG-7 employs a simple linear voltage regulating technique that is based on a voltage divider. This technique is commonly referred to as “voltage loop regulation.” In order to understand how it works, it is beneficial to explain the diagram in Figure 1. The Figure shows the basic circuitry of a linear voltage regulator. In the circuit, two resistors, R1 and R2, create a voltage divider, where the voltage across R2 is proportional to the current through R1. In order to maintain an output voltage, Vout, a reference voltage, Vref, is placed between a resistor divider and the output. The voltage difference between Vref and Vout is maintained by the voltage Divider.

Figure 1: Diagram of the Linear Voltage Regulator

The AP7313-15SAG-7 works on the same principle as a voltage divider. With the voltage divider, the output voltage is proportional to the reference voltage, Vref. The output voltage can be adjusted by varying the value of one of the resistors, R1 or R2. The voltage difference between the output voltage and the reference voltage is compared to the voltage of the two resistors, R1 and R2, in the voltage divider. If the voltage difference is too large, the voltage of R2 is increased until the voltage difference is brought back to the reference voltage. This is repeated until the output voltage is maintained at the desired value.

In addition to its voltage loop regulation, the AP7313-15SAG-7 also includes a slew-rate control circuit, which allows it to accurately maintain the output voltage even under rapidly changing loads. The device also features an over-current protection function that limits the output current to prevent any damage to the system due to overloads or short circuits.

In conclusion, the AP7313-15SAG-7 is a linear voltage regulator that utilizes a voltage divider circuit to maintain an output voltage. It is suitable for post-regulation applications, as it offers a wide input voltage range and high load current capacity. The device also offers over-current and overtemperature protection, making it a reliable and robust solution for post-regulation applications.

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