FAN2103MPX

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FAN2103MPX Application Field and Working Principle

The Texas Instruments FAN2103MPX is a low noise, low-side NPN switch voltage regulator with an output frequency of up to 400 kHz. It is mainly used in microprocessor power management applications and power supply design applications. It is designed to work with an integrated power MOSFET and a low quiescent current control circuit. The FAN2103MPX has a N-channel output stage MOSFET and a low-side, low voltage, low noise, non-overlap gate drive configuration that helps to reduce the total power needed for load current and is ideal for powering low-power, low supply voltage DC/DC applications.

The FAN2103MPX\'s internal power switch allows for lower thermal and good efficiency in low-power, low-voltage, low-noise DC/DC switching regulator designs. With a 1.65 V to 6 V input voltage range, the FAN2103MPX can be used to step down output voltage and current for battery-operated devices such as portable PCs, cell phones, and other hand-held devices. It supports a wide range of output voltages from 0.75 V to 6 V with a minimum dropout voltage of 0.04 V, making it ideal for low-dropout regulator applications. It has a typical efficiency of 95% and can support up to 0.5 A maximum output current.

Working Principle

The FAN2103MPX is a non-overlap gate-drive switch regulator with a N-channel, low-side MOSFET output stage. The output voltage of the device is regulated by controlling the duty cycle of the switch. The duty cycle is controlled by an internal voltage-controlled oscillator with an adjustable frequency of up to 400 kHz. The frequency is determined by the control voltage that is applied to the VCTL pin, with higher control voltages generating higher frequencies.

The FAN2103MPX also includes an enable logic block to provide flexibility for system power management and startup sequences. The device can be enabled by applying a logic high voltage to the ENABLE pin. This logic is provided by an external voltage such as a logic pin pulled low by a microcontroller. Once enabled, the MOSFET switch is internally energized and the oscillator starts to ramp up until it reaches the VCTL voltage, which sets the switching frequency.

When the VCTL voltage exceeds the internal voltage threshold, the output voltage is achieved by keeping the duty cycle above the pre-determinedset point. The VCTL voltage is mostly determined by an internal error amplifier that ensures accurate and stable output voltage regulation. The converter will continue to operate until the ENABLE pin is set to a logic low, in which case the converter is then shut off.

Conclusion

The Texas Instruments FAN2103MPX is a low-noise, low-side NPN switch voltage regulator used in microprocessor power management applications and power supply design applications. It is ideal for powering low-power, low supply voltage DC/DC applications, with an input voltage range from 1.65 V to 6 V, a minimum dropout voltage of 0.04 V, a typical efficiency of 95%, and a maximum output current of 0.5 A. The FAN2103MPX is a non-overlap gate-drive switch regulator with a N-channel, low-side MOSFET output stage, and an internal voltage-controlled oscillator with adjustable frequency of up to 400 kHz. The FAN2103MPX also includes an enable logic block for flexible system power management and startup sequences.

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