Part Number: LM3481QMMX/NOPB

Manufacturer: Texas Instruments


Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of LM3481QMMX/NOPB

Datasheet  LM3481QMMX/NOPB datasheet
Category Integrated Circuits (ICs)
Family PMIC – Voltage Regulators – DC DC Switching Controllers
Manufacturer Texas Instruments
Series Automotive, AEC-Q100
Packaging Tape & Reel (TR)
Part Status Active
Output Type Transistor Driver
Function Step-Up, Step-Up/Step-Down
Output Configuration Positive
Topology Boost, Flyback, SEPIC
Number of Outputs 1
Output Phases 1
Voltage – Supply (Vcc/Vdd) 2.97 V ~ 40 V
Frequency – Switching 100kHz ~ 1MHz
Duty Cycle (Max) 85%
Synchronous Rectifier No
Clock Sync Yes
Serial Interfaces
Control Features Enable, Frequency Control, Ramp, Soft Start
Operating Temperature -40°C ~ 125°C (TJ)
Package / Case 10-TFSOP, 10-MSOP (0.118″, 3.00mm Width)
Supplier Device Package 10-VSSOP


The LM3481QMMX/NOPB is a high-performance low-side N-FET controller designed for switching regulators. If you want to properly grasp this device or use it in your projects, this detailed guide will help you make the most of its features and capabilities.

Introduction to the LM3481QMMX/NOPB

The LM3481QMMX/NOPB is a critical component in power electronics. This device is designed primarily for use in SEPIC, Boost, and Fly back converters, as well as other topologies that need a low-side FET as the primary switch. Let’s look at some of the most important components and functions of this fantastic controller.

Key Features

● Automotive-Grade Products

Some LM3481 variations, such as the LM3481QMM, are automotive-grade and AEC-Q100 Grade 1 rated. This means they can work in temperatures ranging from -40°C to +125°C, making them suited for use in tough automotive conditions.

● Compact 10-Lead VSSOP Package

The LM3481QMMX/NOPB is available in a 10-lead VSSOP (Very Small Outline Package) that is not only tiny but also simple to use in a variety of applications.

● High-Performance Internal Push-Pull Driver

A high-performance internal push-pull driver with a peak current capability of 1A is included in the device. This driver is required for efficient control of the associated FETs and power supply regulation.

● Current Mode Control

The LM3481QMMX/NOPB uses current mode control, which improves bandwidth and transient response. This attribute is critical for preserving stability and precision in a variety of applications.

● Adjustable Frequency

This controller’s changeable switching frequency, which can be set between 100kHz and 1MHz, is one of its notable features. This adaptability allows you to customize your design to meet the exact requirements of your application.

● Built-In Protection

In every power electronics application, safety is of the utmost importance. To protect your system from any damage, the LM3481QMMX/NOPB includes built-in protection features such as short-circuit protection, thermal shutdown, and overvoltage protection.

● Power-Saving Shutdown Mode

The gadget has a power-saving shutdown option that reduces the total supply current to just 5A. This mode is very important for power supply sequencing and energy-efficient operation.

● Internal Soft-Start

The LM3481QMMX/NOPB minimizes the inrush current at startup by using an inbuilt soft-start feature. This ensures a controlled and smooth power-up process.

● Current Slope Compensation

The design procedure is simplified by integrated current slope adjustment. You may fine-tune it even further with a single resistor, adapting your solution to the precise needs of your application.


The LM3481QMMX/NOPB is a versatile controller that can be used in a variety of applications. Among the major use cases are:

  • Automotive Start-Stop use: The device’s automotive-grade capabilities make it an excellent choice for use in automobiles, particularly in extreme temperatures.
  • ADAS (Advanced Driver Assistance Systems) in automobiles Driver Information: This device can be used in ADAS systems to improve vehicle safety and driver information systems.
  • Portable Audio Systems Powered by Batteries: The LM3481QMMX/NOPB’s effective power management can benefit one or two-cell Li-ion battery-powered Bluetooth audio systems.
  • Portable Electronics: Its compact design and high performance can benefit devices such as notebooks, PDAs, digital cameras, and other portable electronics.
  • Offline Power Sources: To provide efficient power conversion, the LM3481QMMX/NOPB can be employed in offline power supply.
  • Set-Top Boxes: It’s a good solution for managing power supplies in set-top boxes, assuring reliability and efficiency.
  • Boost for Audio Amplifiers: The device can improve audio amplifiers’ quality and performance.

In-Depth Features of LM3481QMMX/NOPB

Let’s take a closer look at the LM3481QMMX/NOPB’s specialized characteristics to get a better understanding of it:

Overvoltage Protection

Overvoltage protection is an important safety feature built into the LM3481QMMX/NOPB. Its purpose is to keep the voltage from exceeding a predetermined safe limit. This function is critical for protecting not just the gadget itself, but also all attached circuits.

Voltage spikes or fluctuations can arise in a variety of applications due to external influences or internal system dynamics. Overvoltage protection keeps the device operating within its safe voltage range, lowering the danger of component damage, system instability, or unexpected failures.

Bias Voltage

Bias voltage is a feature of the LM3481QMMX/NOPB that allows for accurate voltage control. This capability is especially useful in applications where keeping a constant voltage level is crucial.

To satisfy performance or regulatory requirements, certain applications necessitate precise voltage control. Because of the bias voltage function, the LM3481QMMX/NOPB can produce very steady and precisely regulated output voltage, making it suited for applications requiring constant power delivery.

Slope Compensation Ramp

The slope compensation ramp is a distinct and adaptable feature of the LM3481QMMX/NOPB. It can be customized to meet the exact design needs of your application.

Slope compensation is used to improve transient response and compensate for inadequate control loop dynamics. The LM3481QMMX/NOPB allows you the ability to maximize the controller’s performance in your application by allowing fine-tuning of the slope compensation ramp, especially when faced with severe load changes or operating conditions.

Device Functional Modes

The LM3481QMMX/NOPB has several operational modes, each of which serves a specific purpose:

  • Normal Operation: The device operates in its standard configuration, managing the power supply as intended.
  • Shutdown Mode: The shutdown mode significantly reduces the device’s power consumption to a mere 10-A (at over-temperature). This is quite useful for power savings and power supply scheduling.
  • Specific Frequency Settings: You can configure the LM3481QMMX/NOPB to operate at specific frequency settings within its adjustable range of 100kHz to 1MHz, according on the needs of your application. This adaptability allows you to fine-tune the controller to meet the requirements of your application.

Why are they important?

Understanding and successfully exploiting these functional modes is critical for maximizing the performance of the LM3481QMMX/NOPB. You can select the appropriate mode based on the individual operational requirements of your application to ensure efficient power management and control.

The LM3481QMMX/NOPB is a feature-rich controller with sophisticated capability to fulfill a wide range of application requirements. Because it incorporates overvoltage protection, bias voltage management, slope correction, and many operational modes, it is a versatile choice for power electronics designers and engineers. You may assure the stable and effective operation of your power supply systems while adapting them to your specific application demands by utilizing these specialist features.


The LM3481QMMX/NOPB is a versatile and powerful controller that offers a wide range of features for switching regulators. Its compact design, high-performance capabilities, and comprehensive protection features make it a valuable component in various applications, ranging from automotive systems to portable electronics. Understanding its key features and applications will enable you to harness its full potential in your projects, ensuring efficient and reliable power management.

For a more in-depth guide on using the LM3481QMMX/NOPB in your specific application, be sure to refer to the device’s datasheet and application notes provided by the manufacturer. This will help you tailor your design for optimal results and performance.

To delve deeper into the capabilities of this remarkable device, inquire about its functions, or place an order for the LM3481QMMX/NOPB, as well as other electronic components, we invite you to reach out to ICRFQ. As a prominent electronic component distributor based in China, ICRFQ is well-equipped to assist you.

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