INN2105K-TL

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INN2105K-TL is a low voltage DC/DC switching regulator from STMicroelectronics. It is suitable for a range of application areas, including those which require a low input-to-output voltage ratio. It is currently used in consumer and industrial applications, such as mobile phones, portable consumer devices and embedded systems. This application note will discuss the application field of the INN2105K-TL, and its principle of operation.

Application Field

The INN2105K-TL can be used as a stand-alone DC/DC converter to convert an input voltage into any desired output voltage. It is ideal for applications which require a low input-to-output voltage ratio because it can provide up to a 3:1 voltage ratio. Therefore, it is suitable for applications which require an efficient conversion of a low input voltage into a higher output voltage, such as for battery powered devices, such as mobile phones and portable consumer electronics products.

The INN2105K-TL can also be used in a buck-boost configuration. This means that it can be used to step-up or step-down an input voltage as desired. This makes it ideal for applications which require a high degree of flexibility, as it can be used to provide a wide range of output voltages. This makes it suitable for many industrial applications, where input voltages can vary significantly.

Working Principle:

The INN2105K-TL is an offline switcher. This means that it switches on and off the power supply to the output `depending on the input voltage and the desired output voltage. It uses a pulse width modulation (PWM) technique to achieve this. The pulse width modulation technique uses a low frequency (usually less than 100kHz) to control the switching of the power supply.

When the voltage at the input of the INN2105K-TL falls below the reference voltage, the switching transistor is turned on. This supplies power to the output. When the input voltage rises above the reference voltage, the transistor is turned off, thus interrupting the power supply to the output.

The output voltage is controlled by the reference voltage. The reference voltage is determined by the ratio of the input voltage to the output voltage. This reference voltage can be adjusted using the external control pin, allowing the output voltage to be changed as desired.

The INN2105K-TL can also be used in a synchronous buck configuration. In this case, it can be used to convert an input voltage of up to 12V into a regulated output voltage of between 4V and 16V. This makes it suitable for applications which require a regulated output voltage from a higher input voltage.

The INN2105K-TL has a low quiescent current and a low dropout voltage. This means that it can supply power to the load efficiently, even when there is only a small difference between the input voltage and the output voltage.

The INN2105K-TL is also protected against over-voltage, over-current and short-circuit conditions. Additionally,it also has an adjustable soft-start feature, which ensures that the power supply is gradually turned on when the power is first applied. This prevents the output voltage from falling too quickly, which could cause a sudden surge in current.

In conclusion, the INN2105K-TL is a versatile switching regulator, which can be used in a range of applications. It can convert a low input voltage to a higher output voltage, and also be used in a buck-boost or synchronous buck configuration. Additionally, it has protection against over-voltage, over-current and short-circuit conditions, as well as adjustable soft-start feature. This makes it suitable for applications which require a low input-to-output voltage ratio, such as for battery powered devices.

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