S-1112B20PI-L6FTFU

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Linear voltage regulators are used to convert a higher voltage to a lower voltage, maintaining the result at a steady level no matter what happens in the power supply. The S-1112B20PI-L6FTFU is a low-dropout (LDO) regulator produced by ROHM Semiconductor designed to work in conjunction with its product line enabling energy efficiency, system protection and simple design. It is a precision, low-drop voltage regulator utilizing advanced BiCMOS technology to provide the lowest possible dropout voltage, low noise (<2mVrms) and a fast Transient Response (<4us).

The S-1112B20PI-L6FTFU features a drive current of 2A and an output voltage capability of 2.5V to 6V. It also has an efficient power saving feature that reduces supply current to 0.2mA or less when the output current is less than 0.2A in the adjustment pin short-circuited state. It is a small and thin device ideal for applications where minimizing board space and package size is a priority, such as cellular phones and other portable equipment.

One of the most useful features of the S-1112B20PI-L6FTFU is its high noise immunity. It is designed to have a transfer gain of 300mV/V, eliminating output voltage change over the input voltage range, allowing it to reject line regulation and limits transients caused by power supply switching. The low current consumption, extremely low output noise and fast response to transients makes the S-1112B20PI-L6FTFU an ideal solution for various system designs with light and medium load current requirements which require noise immunity and stable performance.

The S-1112B20PI-L6FTFU’s LDO regulator works using a two-stage process. First, an uncontrolled rectifier circuit is used to convert the incoming high-voltage AC power into DC. Then, this unregulated source is fed into a three-terminal regulator, which is the active component of the system. It consists of two transistors, one N-channel and one P-channel, which are the actual “regulators”. The regulator is designed to monitor the output voltage and compare it to a reference voltage on the chip. If the output voltage is higher than the reference, the negative terminal of the regulator receives more current which is then used to reduce the output voltage. Conversely, if the output voltage is lower than the reference voltage, the P-channel transistor will be used to increase the current in order to bring the output voltage up. This process of comparison and adjustment happens continuously and provides a stable, steady output voltage.

The advantages of using the S-1112B20PI-L6FTFU LDO regulator in any circuit design is its low power consumption, low cost, small size, high noise immunity, and fast response (4us) to transients. These features make it an ideal solution for applications in cell phones, wearables, portable devices, automotive and consumer electronics. Its ability to reject line regulation and its low current consumption when the output current is less than 0.2A, makes it a great choice for energy conservation. The ability to maintain steady voltage output even when the input voltage range varies makes it a good choice for consumer products which require no dimming of the actual output.

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