MAX5070AAUA+T

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MAX5070AAUA+T is an integrated switched-voltage power management platform from Maxim Integrated, combining a DC-DC switching controller, a MOSFET with an ideal diode, a simple Burst Mode® power-waving controller, and two low-dropout regulators in a single chip. This integrated solution is intended for low noise, high performance point-of-load (POL) power supply applications.

The MAX5070AAUA+T is ideal for applications that require a wide input voltage and a wide output voltage from the same device. The device supports an input voltage range from 4.5V to 36V and an output voltage range from 0.8V to 16V. A current-mode control scheme, wide input voltage range, and soft-start make the MAX5070AAUA+T suitable for a range of applications. Its peak current-mode and Valley current-mode contours allow easy tuning of the switching frequency while allowing a small component count.

Applications

The ultra-low quiescent current, programmable switching frequency, and fast transient response of the MAX5070AAUA+T make it a good fit for automotive, industrial, and medical power applications. The Max5070AAUA+T is applicable for POL applications requiring high efficiency, low noise, or fast transient response which include computer systems, digital power supplies, telecommunication systems, and portable devices.

Working Principle

The MAX5070AAUA+T uses a current-mode control scheme to regulate the output voltage. The device senses current in the low-side MOSFET, compares it to the programmed signal, and drives the MOSFET’s gate voltage in response. This allows the device to provide higher efficiency than alternative voltage-mode control schemes by adjusting switching frequency dynamically, maximizing power transfer to the output, and minimizing power losses.

The MAX5070AAUA+T uses a cascade loop architecture that integrates the PWM current-mode control and the voltage feedback control. The PWM current-mode control regulates the output current to maintain a constant output current; the voltage feedback control regulates the output voltage to maintain a constant output voltage.

When the load current on the output increases, the error amplifiers compare the FBOUT voltage to the FBIN voltage and provide error signal to the PWM. This error signal increases the on-time of the PWM and results in greater current through the low-side MOSFET, increasing the output current and reducing the inductor current.

When the output current decreases, the PWM reduces its on-time, resulting in a decrease in the output current of the low-side MOSFET, and a decrease in the inductor current. In this way, the MAX5070AAUA+T can regulate the output current and maintain a constant output current.

When the output voltage should be regulated, the error amplifiers compare the FBOUT voltage to the FBIN voltage and provide error signal to the PWM, increasing or decreasing the duty cycle of the PWM to regulate the output voltage.

The MAX5070AAUA+T offers a guaranteed minimum on time, resulting in lower output ripple voltage, higher efficiency, and lower EMI noise. The ultra-fast transient response helps to avoid the “staircase” effect of output voltage ramps during load transitions. The device also offers thermal shut-down and packet-loss, as well as soft-start to avoid peak current surge at power-up.

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