S-1137B20-M5T1U

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The S-1137B20-M5T1U is a type of high-performance linear voltage regulator. It is a member of a wide array of linear voltage regulators from Toshiba that are designed to help meet the energy efficiency requirements in various applications. The S-1137B20-M5T1U provides positive, single-adjustable output voltages and a precise output current limiting capability. It is optimised for low dropout voltage, low noise, high output current, and a wide range of output voltages.

Application Fields

The S-1137B20-M5T1U can be used in a variety of settings, such as consumer electronics, industrial equipment, telecom, and medical themes. For consumer electronics, it can be used in smartphones, tablets, laptops, etc. To charge the batteries of these devices, it can help provide a stable output voltage and precise output current limiting. This voltage regulator can also be used in industrial applications for controlling the output current for various devices. It can be used in telecom devices to provide a steady and reliable voltage source, and it can be used in medical applications for precise voltage regulation.

Working Principle

The S-1137B20-M5T1U utilizes a typical linear voltage regulator topology. It consists of three primary elements: a power transistor, an error amplifier, and a feedback network, connected as shown in the image below. The power transistor acts as a switch – allowing current to flow to the output only when the “on” signal is present. The error amplifier is an operational amplifier that compares the reference voltage to the output voltage and generates an error signal, which is then fed back to the power transistor. The feedback network serves to provide the correct amount of negative feedback to the error amplifier to ensure stability.

The output voltage is then determined either by an internal voltage reference or an external voltage reference, depending on the setting of the internal switch. Depending on the setting, the output voltage can be adjusted to a specific value by changing the external components of the feedback network, thereby allowing for fine-tuning of the output voltage.

The S-1137B20-M5T1U is fabricated using high-performance CMOS technology, which enables it to achieve high-efficiency operation and low power dissipation. Furthermore, it features low ripple and low noise operation, programmable output current limit, and a wide temperature operating range. By optimizing the design parameters through these features, the S-1137B20-M5T1U can achieve fast transient response, high accuracy, and frequent start-up/shutdown.

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