ST755CD

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The ST755CD is a charge pump DC-DC converter, which is a type of voltage regulator / DC-DC switching regulator. This particular device is a versatile, highly efficient ultra-low voltage regulator for providing 3.3V or 5V from a 1.2V to 25V input power supply. As such, it is an ideal device for applications where low operating voltages are required, such as single-cell Lithium-ion or Li-polymer based applications. The ST755CD is particularly well suited to be used as a secondary stage regulator, allowing a designer to obtain a regulated voltage from the very low initial voltage of such cells. The device is available in the standard SOIC surface-mount package.

The ST755CD utilizes a charge pump topology, which is a type of voltage switching regulator. In a typical voltage converter, the input voltage is rectified, filtered and then switched on and off at a frequency determined by the amount of voltage required at the output. With the charge pump, however, an additional inductor is used to increase the output voltage. The input voltage is cut into "on" and "off" states and the resulting ripple current is integrated on the inductor and this helps increase the output voltage. The layout of the ST755CD is particularly efficient, as it uses a single-phase capacitor-diode-inductor type of configuration, resulting in a smaller PCB Footprint.

The ST755CD features an on-board step-up voltage converter, which allows it to output higher voltages than the input supply, as high as 5V. The input voltage range is from 1.2V to 25V, and the output voltage range is from 3.3V to 5V. It also includes an enable switch and a high-efficiency, low noise switching frequency of 2MHz. This makes it ideal for applications that need high output voltage, but with low power consumption. Additionally, it provides over-voltage and over-temperature protection.

The ST755CD also includes circuitry for monitoring the input voltage, output voltage and output current. This allows the designer to protect the device from damage due to over-load or overheating. Additionally, the input and output voltages can be monitored by an external microcontroller. This can be done by connecting a voltage monitoring pin to the corresponding voltage pin on the microcontroller. If the voltage spikes above the maximum rated voltage, then the controller will shut-down the system and display an error message to the user.

In summary, the ST755CD is an ideal device for low voltage, high efficiency applications, and is especially well-suited for single-cell Lithium-ion multi-cell Li-polymer battery-based applications. It offers high efficiency and has an adjustable output voltage range from 3.3V to 5V. Additionally, it includes an on-board step-up voltage converter, an enable switch, a high-efficiency, low noise switching frequency of 2MHz, and over-voltage and over-temperature protection. The device is ideal for designers looking for a small, highly efficient, low noise voltage regulator.

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