MP4570GF

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The MP4570GF is a pulse width modulated dc/dc synchronous buck converter integrated with a high side MOSFET and a low side MOSFET, offering fast transient response and constant frequency over a wide output current range. This device is ideal for applications such as power management in low power systems, providing power to the processor core, providing power to peripherals, and controlling an external dc/dc converter module. It also offers precise current mode control for fast transient response and for output voltage accuracy.

Application Field

The MP4570GF is primarily intended for DC/DC switching regulator applications, including point of load (POL) converters, memory and lighting systems, battery chargers, flash memory and PCMCIA cards, and mobile communication systems. The device is designed to provide a simple, efficient, and cost-effective solution for these and other applications.

Working Principle

The MP4570GF is a synchronous buck converter with a low side MOSFET and a high side MOSFET. It utilizes an internal high-side driver and an internal low-side driver. The high side driver incorporates an oscillator which produces a PWM signal. The oscillator frequency is dependent on the output voltage and load. The frequency is adjustable through the introduction of an external resistor. This allows for fast transient response and excellent efficiency for a wide output current range.

The high side and low side MOSFETs at the core of the converter, operate in a master-slave configuration, with the high side MOSFET driving the low side MOSFET. The high side MOSFET is controlled by a low side gate driver, and the low side MOSFET is controlled by a high side gate driver.

The MP4570GF features an internal soft-start circuit to prevent overshoot of the output voltage during start-up. It also contains an internal Under Voltage Lockout (UVLO) circuit to prevent damage to the MOSFETs due to low input voltage. For additional protection, the device also features an integrated overvoltage protection (OVP) circuit.

In addition, the MP4570GF also integrates a voltage output error amplifier which provides precise output voltage accuracy. The output current can be sensed through a current sense resistor, allowing for precise current limit control and fast transient response. The device has an integrated output voltage tracking circuit which allows the output voltage to be adjusted within a certain tolerance range. The output voltage is adjustable from 0.8V to 3.3V.

The MP4570GF has an operating temperature range of 0°C to 85°C. The device has an input voltage range of 3V to 20V, an adjustable switching frequency range of 300 kHz to 5.2 MHz. and up to 95% efficiency. The device requires a 5-pin package and 7 external pins, allowing for a minimum external component design. The MP4570GF is RoHS compliant, lead-free, and fully qualified according to the Automotive Electronics Council AECQ100 Rev G standard.

Conclusion

The MP4570GF is a pulse width modulated dc/dc synchronous buck converter integrated with a high side MOSFET and a low side MOSFET. It is ideally suited for powering cores, peripherals, and controlling an external dc/dc converter module in low-power systems. The MP4570GF is designed to provide an efficient, cost-effective, and easy to design solution for DC/DC switching regulator applications. The MP4570GF features an integrated soft-start circuit, voltage output error amplifier, internal OVP circuit, current sense resistor, and output voltage tracking, ensuring safe operation. The device has an adjustable switching frequency of 300kHz to 5.2MHz, wide operating temperature range of 0°C to 85°C, and high efficiency of up to 95%.

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