LM5109MA

Product Overview

Category: Integrated Circuit (IC)

Use: The LM5109MA is a high-voltage gate driver IC designed for driving both the high-side and low-side N-channel MOSFETs in a synchronous buck or half-bridge configuration. It provides robust and efficient switching control for various power applications.

Characteristics: - High voltage capability - Fast switching speed - Low quiescent current - Thermal shutdown protection - Wide operating temperature range

Package: The LM5109MA is available in a small 8-pin SOIC (Small Outline Integrated Circuit) package, which offers ease of integration into circuit designs.

Essence: The essence of the LM5109MA lies in its ability to efficiently drive high-side and low-side MOSFETs, enabling precise control over power switching operations.

Packaging/Quantity: The LM5109MA is typically sold in reels or tubes containing a specified quantity of ICs, such as 250 or 1000 units per reel/tube.

Specifications

• Supply Voltage Range: 10V to 100V
• Maximum Output Current: 2A
• Operating Temperature Range: -40°C to 125°C
• Quiescent Current: 1.5mA (typical)
• Rise/Fall Time: 15ns (typical)
• Package Type: 8-pin SOIC

Detailed Pin Configuration

The LM5109MA features the following pin configuration:

1. VDD: Power supply input for the IC.
2. HO: High-side gate driver output.
3. LO: Low-side gate driver output.
4. VSS: Ground reference for the IC.
5. SD: Shutdown input for disabling the IC.
6. RT: External resistor connected to set the dead time.
7. CT: External capacitor connected to set the oscillator frequency.
8. HB: Half-bridge node connection.

Functional Features

• High-Voltage Gate Driver: The LM5109MA is capable of driving high-side and low-side MOSFETs with voltages up to 100V, making it suitable for a wide range of power applications.
• Fast Switching Speed: With a rise/fall time of 15ns, the LM5109MA ensures efficient switching transitions, minimizing power losses.
• Thermal Shutdown Protection: The IC incorporates thermal shutdown circuitry to prevent damage due to excessive temperature.
• Low Quiescent Current: The LM5109MA consumes minimal current when not actively switching, reducing power consumption.

Advantages and Disadvantages

Advantages: - High voltage capability enables use in various power applications. - Fast switching speed improves overall efficiency. - Thermal shutdown protection enhances reliability. - Low quiescent current reduces power consumption.

Disadvantages: - Limited output current (maximum 2A). - Requires external components for setting dead time and oscillator frequency.

Working Principles

The LM5109MA operates by receiving control signals from a microcontroller or PWM controller. It generates complementary gate drive signals for the high-side and low-side MOSFETs, ensuring proper switching operation. The external resistor (RT) and capacitor (CT) connected to the IC determine the dead time and oscillator frequency, respectively.

Detailed Application Field Plans

The LM5109MA finds application in various fields, including: 1. Power supplies 2. Motor drives 3. Solar inverters 4. LED lighting systems 5. Electric vehicle charging stations

Detailed and Complete Alternative Models

1. IR2104: High and low-side driver IC with similar specifications.
2. IRS21844: Half-bridge driver IC with integrated bootstrap functionality.
3. MAX15062: High-voltage, half-bridge driver IC with adjustable dead time.

These alternative models offer similar functionality and can be considered as substitutes for the LM5109MA in specific applications.

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