MAX17500BAUB+

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The MAX17500BAUB+ is a step-down switch-mode charge-pump DC-DC controller integrated with a voltage regulator ideal for notebook computers and LCD monitors. This low-cost device incorporates protection features to shut down when the input voltage exceeds the set point and restart periodically to regulate the output voltage. It can be programmed to provide an output voltage in the range of 0.9V to 28V. The chip is offered in a 6-lead DFN package (2 mm × 2 mm) and requires an external Schottky diode and a small inductor.

The MAX17500BAUB+ switch-mode charge-pump DC-DC controller is designed to provide a regulated output voltage with very low noise. It is designed to provide maximum output current with excellent load regulation and low quiescent current. The power stage of the device is optimized to minimize EMI emissions and increase efficiency.

The MAX17500BAUB+ includes a power-stage controller, voltage regulator, pulse-width modulator, current-sensing comparator, oscillator, protection circuity, and diagnostic functions. All operating parameters are digitally programmable using an I2C serial bus. The output voltage is adjustable with a resolution of 1.2 mV, and can be programmed through an external resistor-divider network. The MAX17500BAUB+ provides opto-isolated feedback for improved output accuracy.

The MAX17500BAUB+ uses a switch-mode current-mode technique known as pulse-frequency modulation. In pulse-frequency modulation mode, the device clocks the output switches at the same frequency regardless of the load current. This reduces the ripple current and allows the output voltage to be precisely regulated with no additional circuitry. The MAX17500BAUB+ also supports a variety of operating modes, including PFM/PWM, skip mode, and pulse-skipping mode, which can increase efficiency or lower shutdown current.

The MAX17500BAUB+ includes integrated protection features to protect against over-temperature and over-current conditions. It also enables adjustable soft-start to reduce inrush current and outputs a power-good signal when the output is within specification. It can be used in a variety of applications, including LCD monitors, notebook PCs, portable medical devices, and automotive electronics.

In summary, the MAX17500BAUB+ switch-mode charge-pump DC-DC controller is a highly integrated device ideal for applications requiring low-voltage output with excellent load regulation. It provides all the necessary protection features and diagnostic functions required by application. It is offered in a small 6-lead DFN package and requires only an external Schottky diode and a small inductor. The output voltage can be programmed through an external resistor-divider network.

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