S-1170B46PD-OUFTFG

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PMIC - Voltage Regulators - Linear: S-1170B46PD-OUFTFG

PMIC stands for Power Management Integrated Circuits. Voltage regulators are used to control and regulate the electrical power in electronic devices. Linear voltage regulators, such as the S-1170B46PD-OUFTFG from Silego Technology, are common components used in a variety of applications, from laptops and cell phones to automotive and industrial systems. This article will provide an overview of the application fields and working principles of the S-1170B46PD-OUFTFG.

Application Field

The S-1170B46PD-OUFTFG is an efficient, high-precision voltage regulator, offering reliable and accurate power when used in AC-powered devices. This device is ideal for applications such as adjustable power supplies, switch mode power supply (SMPS) and battery-powered systems, along with many other systems that require power regulation. The S-1170B46PD-OUFTFG offers a wide input range of 4.5 V to 56 V and output voltage up to 5.5 V. It has excellent thermal performance, low noise and very low dropout, making it suitable for a wide range of applications.

The device is capable of providing a high-efficiency output of up to 30 mA. This can be increased up to 100 mA with the use of an external driver device. It has a very low ON-resistance of 1.4 Ohm and 2kV ESD protection, making it suitable for automotive and industrial applications as well. Additionally, it features an adjustable output voltage from 0.8 V to 5.5 V, making it an ideal choice for automotive, lithium-ion battery and charging applications.

Working Principle

The S-1170B46PD-OUFTFG is composed of the NPN power MOSFET (output stage), the P-channel MOSFET (control stage) and the voltage reference. The NPN power MOSFET is responsible for power switching, while the P-channel device is used for voltage regulation as it senses the output voltage. The voltage reference is used to compare the output voltage with the reference voltage, to ensure the output voltage is stabilized.

The device is designed to accept a wide range of input voltage from 4.5 V to 56 V and can provide output voltage from 0.8 V to 5.5 V. The control stage detects the output voltage via the RDS(ON) of the P-channel MOSFET. The control stage then adjusts the ON-resistance to modify the output voltage, providing efficient and accurate power regulation. When the ON-resistance is increased, the voltage drop across the power MOSFET will also increase, which will lower the output voltage.

The S-1170B46PD-OUFTFG has an adjustable output voltage range of “fixed” or “height”. In “fixed” mode, the output voltage is fixed and the output current can be adjusted via a control pin. In “height” mode, the output current is fixed and the output voltage is programmed via a control pin. This feature allows the device to be used in applications where a constant output current and adjustable output voltage is required, such as in automotive and industrial systems.

The device also has built-in reverse-current protection, a soft-start feature and adjustable current limiter, which can be set to reduce power consumption under certain conditions. Due to the wide input voltage range, low noise, excellent thermal performance and low dropout, the S-1170B46PD-OUFTFG is a highly reliable and efficient voltage regulator, making it suitable for use in a wide range of applications.

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