MAX1967EUB+T

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MAX1967EUB+T Application Field and Working Principle

The MAX1967EUB+T of DC-DC switching controllers are a fixed-frequency, current-mode, integral-cycle PWM controllers suitable for synchronous buck DC-DC conversion applications. Offered in a space-saving TDFN-8 package and a max internal frequency of 2MHz, they are capable of providing low output noise and fast transient response. Moreover, they provide a complete range of features, including DDR termination support, selectable external pull up/down for FB, soft start, UVLO, foldback current limit, combined MAX195 dual precision bandgap junction temperature indicator, power good, frequency modulation, and adjustable external soft start.

Application Field

The MAX1967EUB+T DC-DC switching controllers are suitable for a wide range of applications including voltage-transition sequences, step-control circuits, power supply for logic components, and low- and high-side full-bridge applications. Additionally, they are useful in LAN, DSP and microprocessor power supplies, automotive and process control applications, 3V to 3.3V and 5V to 3.3V conversion systems, and SMPS and power adapter systems.

Working Principle

The MAX1967EUB+T switching controller operates based on PWM (Pulse-Width Modulation) control. The chip takes in a reference voltage and produces a corresponding pulse-width modulated signal. This signal is used to control the buck regulator that is connected to it. The buck regulator responds by either increasing or decreasing the switching frequency and duty cycle of the power MOSFETs in order to produce accurate voltage output. The feedback from the output voltage to the reference voltage is regulated by the chip.

The MAX1967EUB+T uses a current-mode control principle. In current-mode control, the current comparator is used to compare the sensed output voltage with a reference voltage (VREF) to derive a control signal. The control signal is then used to adjust the power frequency and switch duty cycle of the power MOSFETs. This ensures that the output voltage of the regulator is stable and accurate. It also allows the chip to respond quickly to changes in the load current.

The MAX1967EUB+T also features internal voltage foldback. This feature enables the integrated power delivery system to provided additional protection to the system by dynamically reducing the peak output current by reducing the power frequency. This helps protect sensitive components from overcurrent damage.

The MAX1967EUB+T switching controller also features frequency modulation, which helps to reduce the audible noise generated by the system. In this feature, the MAX1967EUB+T will vary the switching frequency in order to reduce the ripple and inductor amp-turns. This helps reduce the audible noise from the switching power supply.

The MAX1967EUB+T also supports external soft start control. This feature allows the user to adjust the soft start voltage ramping rate to ensure that the ramping occurs over a desired time period. This helps prevent inrush current and power-up overshoot. Additionally, the chip also supports external pull up/down for the reference voltage (VREF). This enables the user to adjust the reference voltage to a desired level to ensure accurate voltage output.

Conclusion

In conclusion, the MAX1967EUB+T of DC-DC switching controllers offer a wide range of features, such as DDR termination support, selectable external pull up/down for FB, soft start, UVLO, foldback current limit, combined MAX195 dual precision bandgap junction temperature indicator, power good, frequency modulation, and adjustable external soft start. These features enable the chip to provide excellent performance in various applications, such as voltage-transition sequences, step-control circuits, power supply for logic components, and low- and high-side full-bridge applications. Additionally, the chip supports external soft start control and adjustable VREF, enabling the user to customize the power supply for their specific system requirements.

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