S-1131B28UA-N4NTFG

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S-1131B28UA-N4NTFG PMIC - Voltage Regulators - Linear Application Field and Working Principle

The S-1131B28UA-N4NTFG is a PMIC (Power Management IC) belonging to the Voltage Regulators - Linear category and serves as a buck converter. It is housed in a molded PSOT30-L3 package, measuring 2.5×3.5×2.5 mm with an output voltage range of 0.7 V-5.5 V, and an input voltage range of 3.7 V-28 V. It is specifically designed to provide efficient, synchronous, regulated DC/DC converter functions for portable, handheld products. It also includes one of the most advanced technologies for load transient performance.

Applications

The S-1131B28UA-N4NTFG is suitable for a variety of mobile devices, including but not limited to:

• Cellular phones
• Portable multimedia players
• GPS receivers
• Digital cameras
• Game players
• Microcontroller systems
• Wireless local area networks

Features

• Integrated synchronous rectifier
• Output current limit
• Over-voltage protection and current foldback
• Operating frequency range from 10 kHz to 700 kHz
• High efficiency up to 95% @ 3.2 V IN and 1.2 V OUT
• Under-voltage lockout
• Short-circuit protection
• Phase-shift technology for low noise operation
• Hiccup/latching mode over-current protection
• Operating temperature range of -40℃ to +85℃
• Smaller footprint due to the combination of voltage regulator, synchronous rectifier, switches, and inductor into a single device

Working Principle

The S-1131B28UA-N4NTFG is a buck converter, which converts an input voltage to a regulated lower output voltage. Buck converters are widely used to power integrated circuits with a single supply. By controlling the output of the converter, it is able to maintain a constant output voltage even when the input supply voltage changes.

The S-1131B28UA-N4NTFG implements switching and synchronous rectification, allowing it to achieve fast response, high efficiency, and low output noise. It utilises a single inductor to reduce the bill of materials. The S-1131B28UA-N4NTFG can operate in both the continuous conduction mode (CCM) and discontinuous conduction mode (DCM).

The S-1131B28UA-N4NTFG also incorporates a number of integrated protection features. These include current limit, thermal overload protection, under-voltage lock-out and short-circuit protection. It also includes over-voltage protection and current foldback. These features help protect the converter against faults and ensure safe operation.

The S-1131B28UA-N4NTFG has a wide array of other features suitable for portable and handheld applications. These include the ability to operate at a wide input voltage range, low quiescent current and low output noise. The device also incorporates an enable function, making it suitable for power saving applications.

In conclusion, the S-1131B28UA-N4NTFG is a PMIC manufactured by STMicroelectronics. It belongs to the Voltage Regulators - Linear category and is designed to provide efficient, synchronous, regulated DC/DC conversion solutions for portable, handheld products. It features a wide input voltage range, low quiescent current, low output noise, and various protection features. The combination of these features makes the S-1131B28UA-N4NTFG an ideal choice for a variety of low voltage, low power applications in a small footprint.

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