S-1335F21-A4T2U3

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S-1335F21-A4T2U3 Application Field and Working Principle

S-1335F21-A4T2U3 is a linear, voltage regulator from the Power Management Integrated Circuit (PMIC) category. It is a versatile, adjustable regulator, designed to supply both positive and negative symmetric voltages, with guaranteed stability and high accuracy. This regulator features a very low quiescent current, adjustable output voltage range and extremely low ripple noise, making it suitable for diverse applications that require low-level signal precision and signal to noise ratios.

Applications

S-1335F21-A4T2U3 voltage regulators can be used in a variety of applications, including analog, digital and mixed-signal systems. These regulators are well-suited for a range of low-level signal applications, such as preamplifier supply and output amplifiers, audio and video signal control amplifiers, and low-power VCO and DAC circuits. Other potential applications include LED lighting, optical drives, wireless communication, automotive electronics and tamper-proof data acquisition systems.

Working principle

The S-1335F21-A4T2U3 voltage regulator follows the classic Linear Regulator design. This regulator works by establishing a current flow through a series diode (DF) from the incoming supply voltage, which is then filtered and dropped using an adjustable shunt regulator, composed of a BJT (QF) and R2 resistor. The base of the BJT, also connected to the R2, is further voltage-controlled using the signal from an external op amp as the error amplifier, biased by R1, R3 and R4 resistors. The output voltage is thus adjusted to correct the incoming supply voltage whenever a voltage difference is sensed between the reference voltage, formed by R1 and R3 (versus the ground connected to the output) and the feedback signal, connected to the negative input of the OPAMP.

The S-1335F21-A4T2U3 is capable of supplying over a wide range of input and output voltages, from 0.45 V up to 8 V for the input supply, and from 0.4 V up to 3.2 V for the output. The current limit can be adjusted from 0.5 A up to 5 A, and the output voltage can be adjusted from 0.8 V up to 5 V by adding external resistors. Moreover, the device\'s quiescent current is extremely low, about 500 μA in normal conditions, and the device\'s ripple is lower than 0.2 mVrms.

In summary, S-1335F21-A4T2U3 is a versatile, adjustable linear regulator with excellent performance, capable of supplying low-level signals with high precision and signal to noise ratios. It is suitable for a wide variety of applications, thanks to its adjustable output voltage range and extremely low quiescent current and ripple.

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