AP34063S8G-13 Integrated Circuits (ICs)

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AP34063S8G-13 Application Field and Working Principle

AP34063S8G-13 is an embedded system compatible power management integrated circuit (PMIC) with its low voltage output, limited shutdown current and thermal overload protection. It is designed to deliver up to 18 W of a continuous 3.0 A load from input voltages ranging from 4.5 V to 18 V. As a space-saving power conversion solution, it features excellent transient performance, high efficiency, high step-down ratio and adjustable output voltage.

AP34063S8G-13 is a DC-DC buck switching regulator designed for a wide range of applications such as automotive, automotive battery charging, and power supply systems. AP34063S8G-13 utilizes an advanced architecture to provide high efficiency and fixed output voltages. It features internal power MOSFETs and requires minimal external components.

Features of AP34063S8G-13

• Wide 4.5V to 18V Input Range Operates at Low Input Voltages
• Integrated Power MOSFETs
• Integrated Current Limit and Auto-retry Protection
• Narrow Pulse Width Modulation (PWM) Frequency Range
• Over Temperature Protection
• Output Enable Control Pin
• 5V Logic Compatible Enable Pin
• Soft-Start

Application Fields for AP34063S8G-13

• Automotive Systems
• Battery Charging
• Power Supplies

AP34063S8G-13 Working Principle

AP34063S8G-13 integrates two power MOSFETs, one for the PWM switching, and the other for current limit and short-circuit protection. All switches are internally controlled and synchronized. The current limit threshold can be programmed via the external resistor to suit the system, while the external logic control pin is used to turn off the device. The device requires a minimum of frequency and gain tuning to ensure desired output voltage regulation.

The switching frequency is preset at a nominal value of 500 kHz, which allows the package and magnetics size optimization. The operating frequency can be changed through an external resistor, thus providing different input and output voltage ratios for improved efficiency.

The current limit and the auto-retry (AR) function are essential to power cycle the device in case of a severe overload, or a short-circuit condition on the output. The device supports a nominal current limit threshold of 2.5 A, which can be reduced by means of an external resistor. The auto-retry (AR) function prevents the device from immediately latching-off during a short overload. If an overload occurs, the PWM decreases the duty cycle gradually to a safe level, thus allows it to restart after a certain time.

The output voltage can be programmed using an external single resistor. The voltage can be set anywhere between 1.2 V and the feedback voltage (1.245V). The start-up is controlled by an internal soft-start circuitry. The soft-start prevents the output from impulsively rising from the power-up or from the auto-retry reset conditions.

Conclusion

AP34063S8G-13 is an embedded system compatible power management integrated circuit designed for a wide range of applications such as automotive, automotive battery charging, and power supply systems. It has a wide 4.5V-18V input range, integrated power MOSFETs, current limit and auto-retry protection, narrow PWM frequency range, over temperature protection, output enable control pin, 5V logic compatible enable pin, and soft-start. It has excellent transient performance, high efficiency and adjustable output voltage.

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