CM1901-7R

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DC-DC converters are devices that convert Direct Current (DC) from one voltage value to another. The CM1901-7R is a DC-DC converter that is portioned into two parts, with a buck-boost primary stage and a simplifiedhybridized secondary stage. The CM1901-7R allows the input voltage to change from as low as 3.5V to as high as 17V while the output voltage is set at 12V.

The primary part of the CM1901-7R is considered the buck-boost. This section has both the buck and the boostoverlaid on the same die giving it its name. Thanks to itswide input range operation is possible under any one of thoseoperating conditions. The buckboost integrates two input power switches controlled by the MCU-based voltage-mode control. This is to ensure accurate current sensing and fast load transient response to maintain the output voltage at a steady 12V, even under changing loads.

The secondary stage handles the error amplification and PWM modulation. The IC includes a comparator whose reference voltage is set with a resistor network, this which maintains the output voltage constant at 12Vregardless of input voltage. A reference voltage is created with the help of an DAC integrated that is also controlled by the MCU and sets the output voltage to its desired value. Additionally, the PWM modulation control is done by the MCU, with the secondary stage configuring the PWM signal.

The CM1901-7R is unique in that it combines both the buck-boost converter and the secondary stage in one chip. This saves time, cost and space since two ICs are not required and the IC does not require external components for the loop stabilization. This makes it an ideal choice for many applications such as charging solutions for lithium ion battery.

In summary, the CM1901-7R is a DC-DC converter that features a buck-boost primary stage and a simplified hybridized secondary stage. Its wide input voltage range allows it to operate under any conditions while its two integrated power switches and PWM modulation control with MCU ensures accurate current sensing and fast load transient response. Its ability to combine multiple stages in one chip makes the CM1901-7R an ideal choice for applications such as charging solutions for lithium ion battery.

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