SC2738IMSTRT

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The SC2738IMSTRT is a linear regulator controller (LRC) integrated circuit (IC) manufactured by Samsung, which provides the control functions for a linear regulator. The IC is especially suited for implementing low-noise, low-dropout, and low-power linear regulators in a variety of power supply applications. The IC simplifies designs and increases efficiency for space-constraint circuits.

The SC2738IMSTRT is an ultra low-power LRC for noise-critical applications running on operating voltages from 2.7V to 16V. It has an adjustable output voltage and a current overload protection circuit. It is designed to reduce the technological hurdles of quick changing noise requirements and the complex design of multi-phase linear regulators. The SC2738IMSTRT allows almost any set of supply voltages, supplied current, load current and desired output voltage to be realized, providing a design flexibility that has not been matched before.

The SC2738IMSTRT has an input voltage range between 2.7V and 16V and offers a wide range of adjustable output voltages from 0.5V to 15V. Its maximum output current is programmable up to 100mA. Its adjustable operating frequency up to 2MHz allows higher efficiency with small-sized components, providing smaller form factor designs. The IC features a high-impedance input, enabling the use of low cost capacitors for loop stabilization and provides a low noise reference output for remote sensing applications.

The SC2738IMSTRT linear regulator controller can be used in a variety of applications such as AC-DC power adapters, battery chargers, notebook computers, mobile phones, lighting system, and other portable systems. It is also suitable for switching power supply applications as a low noise and flexible on/off regulator for low dropout linear voltage mode regulation. As a low-noise, low-dropout, and low-power linear regulator, the SC2738IMSTRT is designed to deliver clean, low-ripple output power and is suitable for audio, video and high-speed digital systems with power requirements within its range.

The SC2738IMSTRT is designed with advanced linear technology, making it expandable up to four independent supply rails, allowing the design and implementation of miniature ideal diode linear regulators, ideal diode arrays, and general purpose linear regulators. With the capability of switching between buck and boost modes, the IC is suitable for multiple output applications. It also features programmable loop compensation option and adjustable output voltage sequencing. The IC has an adjustable soft-start feature, allowing it to be integrated into power supply and battery charger systems for enhanced system performance.

The working principle of the SC2738IMSTRT is based on a current mode control loop, where the linear regulator controller monitors the voltage of the output through an error amplifier. Once the error amplifier evaluates the potential difference between the output voltage and the reference voltage, a reference current is generated. This current is then used to adjust the linear regulator’s output voltage by modulating the internal oscillator with a width modulation (PWM) signal.

In the PWM signal generation stage, the voltage difference between the inverting and non-inverting inputs of the error amplifier is monitored to determine the width modulation level. The PWM signal generated will have a pulse-width that is proportional to this difference. Based on this information, the cycle-by-cycle current limit is adjusted accordingly to generate the required output current.

The SC2738IMSTRT linear regulator controller also features a light load current feature, which allows the load current to follow changes in the output voltage. This allows for faster response times for light load applications, which reduces the output voltage dip due to increased load demands. The IC also features power-on reset and over-temperature protection, allowing it to operate reliably even in harsh conditions.

In conclusion, the Samsung SC2738IMSTRT linear regulator controller is a versatile and efficient IC suitable for a variety of power supply applications. It is designed to provide low-noise, low-dropout, and low-power linear regulation for noise-critical applications running on operating voltages from 2.7V to 16V. Its adjustable output voltage, current overload protection, and programmable frequency allow for small-sized components and designs that have flexible design options and improved efficiency. With power-on reset, adjustable soft-start and over-temperature protection, the SC2738IMSTRT is capable of reliably operating even in harsh conditions.

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