SC185LULTRT

The SC185LULTRT is a low voltage regulator circuit which can be used to control the output voltage of a direct current (DC) to DC power supply. It is a member of the PMIC - Voltage Regulators - DC DC Switching Regulators family and is designed to provide highly accurate voltage regulation even when subjected to steep input to output voltage ratio changes, low ripple, and fast transient response. This voltage regulator is suitable for applications that require an adjustable output voltage in the range of 1.2 to 15V.

Features

• High efficient step-up/down switching regulator;
• Wide input voltage range: 2.5V to 40V;
• Output voltage range: 1.2 to 15V;
• Output current up to 5A;
• High efficiency up to 92%;
• Very low quiescent current consumption at light load;
• Fast load transient response;
• Small size (3.3mmx2.6mm footprint);
• Low voltage start-up;
• Low ripple and noise;
• High accuracy;
• Integrated protection functions like short circuit, current limit, thermal protection.

Application

The SC185LULTRT voltage regulator is designed to provide highly accurate voltage regulation even when subjected to steep input to output voltage ratio changes, and is suitable for a wide range of applications that require an adjustable output voltage ranging from 1.2 to 15V. Applications include point-of-load (POL) regulators, solar-panel supplied systems, LCD displays, battery-powered systems, and DC-to-DC converters for charging mobile phone batteries, and many more.

Working Principle

The SC185LULTRT voltage regulator works on a switching regulator principle. In this configuration, the input voltage is passed through an inductor, which stores energy in the form of a magnetic field. When the switch is turned on, this stored energy is transferred to the output voltage rail, resulting in an output voltage that is higher than the input voltage. When the switch is turned off, the opposite process is initiated, and the output voltage will fall back to below the input voltage.

By adjusting the duty cycle of the switch, the average output voltage of the power supply can be accurately controlled. The SC185LULTRT voltage regulator features a built-in frequency compensation scheme, which allows it to maintain a constant frequency, regardless of load or input voltage changes. This ensures stable and accurate output voltage regulation, even in the presence of significant noise or load variations.

Conclusion

The SC185LULTRT voltage regulator is a highly efficient and accurate DC-to-DC switching regulator. It is suitable for a wide range of applications, from POL regulators to battery-powered systems. The integrated protection functions and frequency compensation scheme help ensure excellent load and line regulation, as well as fast transient response and low ripple and noise. All these advantages make this voltage regulator an ideal choice for modern power electronic systems.