AP139-25WL-7

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AP139-25WL-7 Application Field and Working Principle

The AP139-25WL-7 is a linear PMIC – Volt Regulators. It is an integrated 800mA low dropout voltage regulator which enables the device to provide a low noise, stable voltage output. It also features a wide ultra-low quiescent current range through its pulse-frequency modulation (PFM).

Features & Benefits

• Input voltage range up to 8.0V, output voltage accuracy of 1.5V
• Ultra-low dropout voltage
• High-output current range up to 800mA
• Extremely low quiescent current from 0.3uA to 0.9mA
• Wide operating temperature range from -40C to +85C
• Small package size: SOT 343 with a low profile of 0.3mm
• Low noise output due to its PFM
• Accurate auto-discharge control
• Short-circuit protection, power limitation and thermal protection

Applications

The AP139-25WL-7 linear regulator is ideal for applications where low noise and high accuracy is important, such as medium-power devices like smartphones, digital ISOCs, car navigation devices, audio products, and general portable devices. It is also suited for other low-power applications such as industrial control systems, measurement devices, medical equipment, and medical monitoring systems.

Working Principle

The AP139-25WL-7 operates in two modes, pulse frequency modulation (PFM) and continuous conduction mode (CCM). In the PFM mode, the device switches between active and standby modes depending on load demand. This allows the regulator to remain in standby mode when not needed, resulting in a low quiescent current. When the load current is light, the regulator is set to operate in a series of brief pulses, thus maintaining the output voltage while minimizing power wastage. Once the load current increases, the regulator transitions to CCM mode, providing a continuous current to the load.

The AP139-25WL-7 is equipped with short-circuit protection, power limitation and thermal protection. Its short-circuit protection prevents the output from reaching dangerous levels should an unexpected short occur. It also limits the output, preventing damage to the discrete components in the circuit. Additionally, the device has thermal protection which prevents overheating and ensures that the device does not exceed its safe operational temperature.

Conclusion

The AP139-25WL-7 linear PMIC – Volt Regulators is an excellent choice for low-power applications where noise and accuracy are important. With its ultra-low quiescent current, wide input voltage range, high-output current range, wide operating temperature range and short-circuit protection, power limitation, and thermal protection, it is well-suited for a variety of medium-power and low-power applications in smartphones, digital ISOCs, car navigation devices, audio products, and general portable devices.

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