MAX8548EUB+T

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The MAX8548EUB+T is a complete DC-DC switching regulator controller and driver IC, designed and optimized for high voltage, low current operations. It utilizes advanced control techniques to ensure minimal power dissipation, fast transient response and low noise. It includes current-mode control, voltage mode control, frequency compensation and an internal 5V low drop-out voltage regulator. The MAX8548EUB+T is an ideal choice for many DC-DC conversion applications, from boosting, buck, SEPIC and flyback topologies, to converters for industrial supplies, telecom converters, notebook PC and handheld device battery charging applications.

The MAX8548EUB+T is a sophisticated DC-DC switching controller and driver IC in a small all-in-one, ultra-late-to-date (L2DTM) package. This Linear Technology contribution features a classic current mode control and drives power MOSFETs in both DC-DC boost and buck converters up to 15V. This low current driver, rated for 1.2A continuous and 5A peak, is also supply-voltage independent and comes with pre-biased bootstrap capabilities.

As with any regulator, the MAX8548EUB+T’s primary duty is to regulate the output voltage. This is accomplished by a circuit that compares the output voltage with a reference voltage and adjusts the duty cycle of the power FET, which sets the amount of energy that is transferred to the output capacitors. The controller has three components, the Error Amplifier (EA), the Duty Cycle Controller (DCC) and the Driver and Shut-down circuit.

The Error Amplifier monitors the output voltage and compares it to the reference voltage. If the output voltage surpasses a predetermined value, then the Error Amplifier decreases the duty cycle. If the output voltage is below a predetermined value, then the Error Amplifier increases the duty cycle accordingly.

The Duty Cycle Controller (DCC) is a feedback loop within the MAX8548EUB+T. It consists of a saw-tooth oscillator, an internal error amplifier, an optional external resistor (RSENSE) and also a current-limited amplifier. The output of the DCC determines the switching frequency and also the pulse-width of the Mosfet driver. The DCC allows for a wide range of frequency selection, enabling the user to optimize the frequency for a particular component.

The MAX8548EUB+T also features a low drop-out linear regulator with a 5V output. This can be used to power external circuitry, and is capable of supplying up to 10mA of current. A separate enable pin is also available, allowing the user to put the regulator in low power mode or turn it off completely.

The MAX8548EUB+T also features both an over temperature protection circuit and an under voltage lockout circuit. These circuits are designed to help protect the IC against thermal damage and to increase the overall reliability of the system.

The MAX8548EUB+T is a highly versatile and effective DC-DC switching regulator controller and driver IC. With its set of features and unique design, the MAX8548EUB+T is ideal for a wide range of application fields, from industrial supplies and telecom converters to battery charging. It is also suitable for notebook PC, handheld device and other battery charging applications.

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