ADM8660ARZ-REEL

ADM8660ARZ-REEL Application Field and Working Principle

Introduction

The ADM8660ARZ-REEL is a dc-dc switching regulator classified as PMIC – Voltage Regulators – DC DC Switching Regulators. This device can work with various types of supplies, e.g. Li-Ion, alkaline, and NiMH batteries, as well as with a wide input voltage range (3.3V and 5V when sourcing, 4.2V and 10V sinking). ADM8660ARZ-REEL is suitable for applications like consumer and industrial digital products, such as phone, MP3 players, and computers.

Application Field

The ADM8660ARZ-REEL is suitable for different types of consumer and industrial digital products, such as phone, MP3 players, and computers. This device offers high efficiency, fast transient response time, and low power dissipation. The wide input voltage range (3.3V and 5V when sourcing, 4.2V and 10V sinking) makes it even more powerful and suitable for different types of applications. It can also work with various types of supplies, such as Li-Ion, alkaline, and NiMH batteries.

The device integrates a 100mA switch with an internal 1.2V voltage reference typically and an internal = 18µA bias current source. This voltage regulator is able to run at a wide switch frequency range (2kHz to 500kHz) and with a peak load current up to 300mA peak.

Working principle

The ADM8660ARZ-REEL works under the Constant On-Time (COT) control scheme. The internal P-channel mosfet is used by the device on its input to store energy. The P-channel MOSFET switches according to the reference voltage and is set to turn off abruptly when the internal reference voltage is hit and prevent a higher output voltage. This prevents over-voltage output and saves energy and also prevents damage to electrical components.

The ADM8660ARZ-REEL includes a 4-bit Digital-to-Analog (DAC) for the reference settings. The DAC can be used to adjust output voltage and over-voltage protection level. The device also includes an internal 1.2V voltage reference and a bias current source (typically 18µA). This source is to be used to regulate the reference voltage, as it automatically adjusts itself to correct the voltage drift due to temperature changes.

The device also integrates an internal Soft-Start function which, when enabled, controls the rising of the output voltage. It limits inrush currents and eases the load the regulator can handle. Soft-start rate typically goes from 100mV/ms to 200mV/ms.

The device can be connected to an enable pin located at the output, which can be used to control the load current. Under light or no load, switching frequency is reduced and the device can enter into Shutdown mode, thus reducing power dissipation when the output voltage is below the reference voltage.

The isolation feature available in this device adds to the safety of electrical components and prevents short circuits. It allows the device to be used in applications requiring isolation, such as non-isolated dc-dc supplies in notebook and desktop computers.

Conclusion

The ADM8660ARZ-REEL is a great dc-dc switching regulator suitable for consumer and industrial digital products as well as other applications that require a wide range of voltages. It has a wide input voltage range 3.3V and 5V when sourcing, 4.2V and 10V sinking), and can work with various types of supplies, such as Li-Ion, alkaline, and NiMH batteries. It also integrates a 4-bit Digital-to-Analog (DAC) for the reference settings and an internal Soft-Start function which, when enabled, can limit inrush currents and eases the load the regulator can handle. Moreover, the device includes an isolation feature for added safety. All in all, the ADM8660ARZ-REEL is an excellent choice for different power supply and load applications.