The **APL1568-R** is a high-performance linear regulator (LDO) specifically designed for applications requiring low dropout voltage and high output current. It is commonly used in computer motherboards, notebooks, and graphic cards to power chipsets and memory modules. --- ### ## Technical Specifications The following table highlights the core electrical characteristics of the APL1568-R: | Parameter | Specification | | :--- | :--- | | **Input Voltage Range** | 1.2V to 5.5V | | **VCNTL Voltage Range** | 3.0V to 5.5V | | **Max Output Current** | 0.8A (800mA) | | **Dropout Voltage** | ~0.2V @ 0.8A | | **Output Voltage Accuracy** | ±1.5% | | **Package Type** | SOT-223 / SOP-8 | | **Protection Features** | OTP (Over Temp), OCP (Over Current) | --- ### ## Pin Configuration and Functions The APL1568 typically utilizes a control voltage ($V_{CNTL}$) separate from the main input ($V_{IN}$) to drive the internal pass transistor effectively, reducing power dissipation. 1. **VIN**: Power input for the regulator. 2. **VCNTL**: Bias voltage for the internal control circuitry. 3. **VOUT**: Regulated output voltage. 4. **GND**: Ground reference. 5. **ADJ/SET**: Used to define the output voltage via an external resistor divider. 6. **POK (Power OK)**: Open-drain output signaling when the output is within regulation. --- ### ## Key Features * **Low Dropout (LDO):** Because it uses a separate $V_{CNTL}$ pin, the $V_{IN}$ can be very close to $V_{OUT}$, maximizing efficiency and reducing heat. * **Adjustable Output:** It allows for precise voltage tuning, making it versatile for different CPU/GPU core requirements. * **Fast Transient Response:** Designed to handle sudden changes in load current without significant voltage drops, which is critical for digital ICs. * **Built-in Protection:** Includes thermal shutdown to prevent the chip from burning out under heavy load or high ambient temperatures. --- ### ## Typical Application Circuit To use the APL1568-R, external capacitors are required for stability. Below is a simplified representation of the component requirements: ```cpp // Component Recommendations C_IN = 10uF (Ceramic) C_OUT = 10uF (Ceramic/Tantalum) C_CNTL = 1uF (Ceramic) R1/R2 = Voltage Divider Resistors (for ADJ version) ``` ---