AS3656

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AS3656 is a step-up boost converter power management integrated circuit (PMIC) designed to efficiently supply up to 1.5A of regulated output current at regulated voltages up to 7.5V. It is an ideal solution for powering devices such as Wi-Fi, Bluetooth, and cellular radios, as well as other low power load applications.

Application Field

The AS3656 is a great solution for a variety of applications. For example, it is a great choice for powering Wi-Fi, Bluetooth, and cellular radios. It can also be used to supply power to small display and audio systems. Furthermore, it is a great choice for powering LED backlighting due to its fast switching characteristics. The AS3656 provides stable output voltage, up to 7.5V, with a low-noise low-ripple, allowing for the smooth operation of all the components.

Working Principle

The AS3656 is based on a PFM (pulse-frequency modulation) control scheme. All the components used in an AS3656 step-up converter can be divided into four main parts: the inductor, diode, capacitor, and transistor. The inductor stores the energy to be drawn from the input source. The diode is used to protect the circuit from reverse-current. The capacitor is used to stabilize the output voltage, and the transistor is used to control the flow of current from the input source to the output load.

The AS3656 begins by taking a reference voltage, which is usually the voltage output from the battery. This reference voltage is compared to the target voltage, which is the desired output voltage. The error amplifier then amplifies the difference between the two voltages. The result of this comparison is then broken into two different signals – a pulsed signal for the transistor and a frequency signal for the inductor.

The transistor is then activated and the voltage across the inductor rises rapidly due to the increased current flowing through it. When the voltage reaches the target voltage, the transistor is deactivated and the current is redirected to the output load. Any leftover energy stored in the inductor is then redirected to the capacitor, which stabilizes the output voltage and the process is repeated.

In a nutshell, the AS3656 is a DC-DC buck converter with a PFM control scheme. It is capable of delivering up to 1.5A of output current, with an output voltage of up to 7.5V. The AS3656 also has fast response times, high switching efficiency, and low ripple. This makes it a great choice for powering low-power load applications.

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