S-1133B18-U5T1G

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The S-1133B18-U5T1G is an ultra-low quiescent current linear regulator designed for the power management in the low power applications. It is classified as a PMIC - Voltage Regulators - Linear due to its ability to precisely regulate the output voltage in proportion to the input voltage with a low dropout voltage. This device is ideal for low current consumption applications such as medical and wearable devices.

The S-1133B18-U5T1G is available in a SOT-23 package, making it suitable for board space constrained products. The regulator offers an adjustable output voltage from 1.25V to 17V, and a maximum output current of up to 500mA. The ultra-low quiescent current of only 9µA is enabled by its Enable/Disable Input pin and its Enable/Disable Internal Feedback Resistor. Furthermore, this device has a wide input voltage range of 2.5V ~ 18V, a very low dropout voltage of max 0.2V@IOUT=500mA, and offers short-circuit protection to prevent damages caused by overload.

The S-1133B18-U5T1G works by providing a constant output voltage given an input variation. The device consists of an internal p-channel MOSFET linear voltage regulator. A feedback voltage is generated at the Output pin of the device, while an error signal is also generated across the internal resistor network that is compared by the error amplifier. When an error signal is detected, it will be amplified and control the gate voltage of the p-channel MOSFET so that the error signal is reduced, and a constant output voltage is maintained.

In addition, the S-1133B18-U5T1G features reverse current, thermal shutdown, and low power shutdown functions that provide protection to the system during improper operations. Furthermore, it offers a fall time of 250µs, a rise time of 1.5ms, and a guaranteed start-up voltage of 2.1V.

The S-1133B18-U5T1G is especially suitable for applications that requires low power consumption, such as medical device, wearable device, battery powered devices, hand-held devices, and portable systems. It is an ideal device for reducing the power consumption of the application while maintaining a regulated voltage.

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