SC4603IMSTRT

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The SC4603IMSTRT is a high performance switch mode power supply step-down DC-DC controller IC. It is designed for 48-volt applications requiring high current drive from 5 to 12V with minimal external components. It is classified as a PMIC – Voltage Regulator – DC-DC Switching Controller.

The SC4603IMSTRT offers an externally adjustable output voltage range of 5V to 12V with a continuous output current rating of up to 3A. Internal synchronization of various buck and boost topologies is supported along with an integrated Pulse Width Modulator (PWM) that allows for adjustable frequency and duty cycle control.

The SC4603IMSTRT also incorporates a variety of innovative features to provide a robust and reliable system. These include programmable under-voltage lockout (UVLO), integrated soft-start and adjustable current limit, as well as a programmable Compensation Network for accurate control of the output voltage. Additionally, the SC4603IMSTRT offers full protection against over-temperature and over-current faults, as well as fault diagnostic outputs.

The working principle of the SC4603IMSTRT is based on the buck-boost converter, which is a key component in any switch mode power supply (SMPS) system. The converter works by converting an input voltage to a regulated output voltage by using an inductor to store energy, then using a MOSFET to switch the energy between an input voltage source and the output voltage.

The SC4603IMSTRT can operate over a wide input voltage range from 4.5 to 38V and with adjustable output voltage range from 5V to 12V. It can achieve constant switching frequency at switching frequencies between 100KHz and 1MHz. The device also provides internal circuitry for the synchronization of multiple buck converter stages with aggregate output currents up to 3A.

To protect against over-temperature, the SC4603IMSTRT also incorporates an Over-Temperature Shutdown (OTS) block. When an OTS event occurs, the MOSFET switches off, preventing thermal runaway and protecting the IC from damage. Furthermore, the device features an adjustable output current limit that protects the MOSFET switch from excessive currents.

The SC4603IMSTRT is widely used in applications such as Point-of-load (PoL) AC/DC, DC/DC and 12V automotive systems, where it can provide compact, lower-cost and higher efficiency solutions than linear regulators. In automotive applications, the SC4603IMSTRT is ideal for providing 12V power supplies from 24V and 48V inputs, while meeting the stringent automotive requirements for automotive EMI, transients, and electro-magnetic compatibility (EMC).

The SC4603IMSTRT is an excellent choice for a wide range of applications due to its many features and benefits. It is able to deliver high levels of power conversion efficiency with minimal external components, making it an ideal solution for high current, low voltage applications. Furthermore, its adjustable output voltage, synchronization capability and temperature protection, makes for a robust and reliable system.

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