STA801M

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The STA801M is a monolithic step up DC/DC converter with a high efficiency switched driver suitable for mobile applications. It is part of the wide range of DC to DC regulators from ST Microelectronics, specifically in the Power Management IC (PMIC) product category.

The product offers the ability to generate low noise outputs from a single input source, such as a single battery cell, by providing a current limited step-up regulator with average current regulation and low voltage ripple. The product is capable of sourcing up to 200mA of continuous output current with a total output power of up to 400mW.

The STA801M is designed to work in low power battery operated devices, such as mobile phones, digital cameras, and PDAs. Since it operates from a single supply, it avoids the need for complicated dual supply power management systems, saving board space and cost. Its high efficiency and low output ripple also make it ideal for powering devices where long run times are required.

The operating principle of the STA801M is quite simple. The input voltage is applied to the input of the device and this voltage is regulated by an internal low-dropout (LDO) voltage regulator to ensure that the device can operate correctly over a wide input voltage range. The regulator then provides the current to the output of the device via two internal MOSFET switches. These switches turn on and off alternately, depending on the duty cycle determined by the voltage on the output. This alternating current flow is then transformed to a steady DC output voltage.

The STA801M contains many useful features. It has a very low standby current of only 1µA, allowing it to operate in applications where long periods of battery life are required while also ensuring a low no-load power consumption. It also has an integrated voltage supervisor that is used to monitor the state of an external battery and reduce parasitic current draw while the battery is absent. Additionally, it has a built-in protection feature that prevents short-circuit damage in the event of a shorted output.

Overall, the STA801M is a very versatile product that can be used in a wide range of applications. Its low current operating requirements, low output ripple, and integrated protection features make it ideal for use in portable battery powered products such as mobile phones, digital cameras, and PDAs. In addition, its simple operating principle and low cost make it an attractive choice for cost-sensitive applications.

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