Texas Instruments

LM3481MM/NOPB  

DC DC Switching Controllers

The LM3481MM/NOPB is a high-efficiency synchronous step-down (buck) regulator from Texas Instruments. It is designed to provide a stable and regulated output voltage from a higher input voltage source. Here's a brief description, features, and applications of the LM3481MM/NOPB:

Description:

The LM3481 is a monolithic step-down switching regulator that uses a constant-frequency, current-mode architecture. This design allows for high efficiency and excellent transient response over a wide input voltage range. The device operates at a switching frequency of 1.2 MHz, which enables the use of smaller external components and allows for a more compact solution.

Features:

1. High Efficiency: The LM3481 offers high efficiency across a wide load range, with up to 98% efficiency achievable under optimal conditions.
2. Wide Input Voltage Range: The regulator is designed to work with input voltages from 4V to 60V, making it suitable for various power supply applications.
3. Synchronous Rectification: The use of synchronous rectification in the output stage minimizes power losses and contributes to the high efficiency of the device.
4. Constant-Frequency Operation: The 1.2 MHz switching frequency allows for smaller inductor and capacitor sizes, reducing the overall solution size.
5. Low Quiescent Current: The LM3481 has a low quiescent current of 35µA, which is beneficial for battery-powered applications.
6. Soft Start and Over-current Protection: The device includes soft-start and over-current protection features to enhance system reliability and safety.
7. Thermal Shutdown: The LM3481 features thermal shutdown protection to prevent damage due to overheating.
8. Spread Spectrum: The regulator offers spread spectrum frequency modulation to reduce electromagnetic interference (EMI).
9. Adjustable Output Voltage: The output voltage can be adjusted using an external resistor divider, providing flexibility for different output voltage requirements.

Applications:

1. Portable Electronics: Due to its high efficiency and low quiescent current, the LM3481 is well-suited for battery-powered devices such as smartphones, tablets, and wearables.
2. Power Adapters: The regulator can be used in power adapters for a wide range of electronic devices, providing efficient power conversion.
3. Telecommunications Equipment: The LM3481 can be used in power supply applications for telecommunications equipment, where efficiency and thermal management are critical.
4. Industrial Control Systems: The device can be used in industrial control systems, providing stable and regulated power to various components.
5. LED Lighting: The LM3481 can be used in LED lighting applications to provide efficient power conversion and control for LED drivers.
6. Medical Devices: The regulator can be used in medical devices that require a stable and regulated power supply.

The LM3481MM/NOPB is available in a thermally enhanced 5mm x 6mm QFN package, which is suitable for space-constrained applications. It is essential to refer to the datasheet for detailed information on electrical characteristics, operating conditions, and design guidelines.

LM3481MM/NOPB Documents

Download datasheets and manufacturer documentation for LM3481MM/NOPB

PCN Assembly/Origin :

Assembly Site 25/Sep/2020      

Datasheets :

LM3481, LM3481-Q1 Datasheet      

PCN Other :

Multiple Changes 12/Feb/2015      

Design Resources :

LM3481 Design with WEBENCH® Power Designer      

HTML Datasheet :

LM3481, LM3481-Q1 Datasheet