S-1740A10-A6T2U4

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S-1740A10-A6T2U4 Application Field and Working Principle

Introduction

S-1740A10-A6T2U4, also known as a low dropout (LDO) linear voltage regulator, is a three-terminal regulator integrated circuit. It is a type of PMIC (power management integrated circuit) that provides a constant regulated output voltage, regardless of the input voltage source. It is designed to regulate a specific voltage from the source and deliver the desired output voltage. This application note will discuss the application field and working principle of S-1740A10-A6T2U4.

Application Field

S-1740A10-A6T2U4 is typically used in low power electronic applications such as batteries, cell phones, automotive components, computers, and communication systems. The device is well-suited for portable and space-constrained systems that require low local on-board power consumption.

The device is ideal for application-specific designs, with small footprints and large operating temperature ranges. It is also well-suited for applications that require load and line regulation, low quiescent power, and output current and voltage accuracy over a wide range of temperature and load variations. In addition, it has an enable/disable logic pin, allowing enable/disable functions to be conveniently controlled by a logic signal, digital signal processor, button, or other device.

S-1740A10-A6T2U4 provides ultra-low ground current for devices such as cellular phones and notebook computers. It also provides an adjustable output voltage in the range of 1.8V to 5.5V. The device supports adjustable output currents of up to 1A in a SOT-23 package and up to 3A in a SOT-89 package. The S-1740A10-A6T2U4 also has very low dropout, allowing it to be used with selectable output voltages with input voltages as low as 2.7V and as high as 8.5V.

Working Principle

S-1740A10-A6T2U4 linear voltage regulator operates on the principle of negative feedback, which involves comparing the input signal to the desired output signal and adjusting the output signal in order to maintain a constant output voltage. The device consists of two transistors, one PNP and one NPN, to form a regulated source. The regulated source is then connected to the output terminal.

The voltage output of the S-1740A10-A6T2U4 is regulated by a specific resistor divider configured between the output and feedback terminals. During normal operation, the output voltage of the regulator is stayed exactly the same as the voltage at the feedback terminal. When the output voltage deviates from the reference voltage, the regulator will attempt to re-establish the desired output voltage by increasing or decreasing the output current.

The device is provided with a logic enable pin that allows software-controlled signal or logic signal to enable and disable the output. When the enable pin is at low logic level, the output is turned off and no current flows in the output of the device. When the enable pin is at high logic level, the output is turned on and the S-1740A10-A6T2U4 begins to operate.

Conclusion

S-1740A10-A6T2U4 is a low dropout linear voltage regulator that provides a constant regulated output voltage, regardless of the input voltage source. The device is typically used in low power electronic applications such as batteries, cell phones, automotive components, computers, and communication systems. The device operates on the principle of negative feedback, involving comparing the input signal to the desired output signal and adjusting the output signal to maintain a constant output voltage. It is provided with a logic enable pin that allows software-controlled signal or logic signal to enable and disable the output.

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