company blog about Mingjiada Supply LM5108—A Robust, Compact 100V Half-Bridge Gate Driver for Motor Drive, Power Tool, and Switching Power Supply Designs

In high-performance power electronics applications such as motor drives, power tools, switch-mode power supplies (SMPS), and auxiliary inverters, the selection of a gate driver directly determines the system’s efficiency, reliability, and power density. Mingjiada Electronics is now officially supplying the LM5108, a robust and compact 100V half-bridge gate driver from Texas Instruments (TI), providing engineers with an ideal solution that combines high performance, a small package, and high system robustness.

I. LM5108 Product Overview

The LM5108 is a high-frequency half-bridge gate driver from Texas Instruments with a maximum switching node (HS) voltage rating of 100V and an absolute maximum turn-on voltage of 110V. This device supports the driving of two N-channel MOSFETs in various half-bridge topologies, including synchronous buck, full-bridge, active-clamped forward, LLC resonant, and synchronous boost, meeting a wide range of design requirements from consumer to industrial applications.

With its ultra-compact 3mm × 3mm VSON-10 package, the LM5108 delivers powerful drive capability within a minimal PCB footprint, making it particularly well-suited for compact power supply designs with stringent space constraints, such as power tools and handheld devices.

II. LM5108 Key Features and Advantages

1. Powerful Drive Capability

The LM5108 provides an output capability of 2.6 A sink current and 1.6 A source current, effectively driving the gate capacitance of high-power MOSFETs to achieve fast switching transitions. Combined with a typical rise time of 11 ns and a typical fall time of 8 ns (under a 1000 pF load), this significantly reduces switching losses and improves overall system efficiency.

2. Extremely Short Propagation Delay and Precise Delay Matching

The device features a typical propagation delay of 20 ns and a typical delay matching as low as 1 ns. The high degree of matching between the high-side and low-side outputs during turn-on and turn-off allows designers to precisely optimize dead-time, maximizing efficiency while preventing cross-conduction.

3. Interlock Protection Enhances System Robustness

The LM5108 incorporates an interlock or cross-turn-on protection feature that prevents both outputs from turning on simultaneously when both inputs are high. This feature significantly enhances system robustness in applications such as motor drivers and power tools, effectively preventing the risk of power transistor burnout caused by software or external interference.

4. Flexible Enable/Disable Control

The device provides an enable/disable function, allowing designers to flexibly and quickly control the power stage’s on/off state. For battery-powered portable tools, the disable function reduces standby current to just 7 µA, significantly extending battery life while enabling rapid response to system faults.

5. Integrated Bootstrap Diode for Simplified Design

The LM5108 integrates an on-board bootstrap diode, eliminating the need for external discrete diodes. This design not only reduces the number of components in the BOM but also improves PCB space utilization, lowering design complexity and system cost.

6. Excellent Noise Immunity

Both the input and enable pins feature sufficient hysteresis, improving system robustness in noise-prone applications such as motor drivers. Additionally, the HS pin can withstand an absolute maximum negative voltage of –7 V, enhancing survivability in harsh electrical environments.

7. Low-Voltage Operation Supports High-Frequency Switching

A typical 5V under-voltage lockout (UVLO) allows the driver to operate at lower bias voltages, enabling the power stage to operate at higher switching frequencies without significantly increasing switching losses. The VDD and HB UVLO thresholds are carefully designed to ensure that the high-side and low-side drivers typically turn on simultaneously at 5V.

III. Typical Application Scenarios

Thanks to its outstanding performance and compact package, the LM5108 is widely used in the following three major areas:

1. Motor Drivers and Power Tools

In applications such as 48V BLDC motor drives, power tools, drone ESCs, and robotic joint drives, the LM5108’s 100V voltage rating, interlock protection, noise immunity, and extremely short propagation delay make it an ideal choice. Battery-powered tools can also utilize its enable function to reduce standby power consumption.

2. Switch-Mode Power Supplies (SMPS)

In synchronous buck converters, active-clamped forward converters, LLC resonant converters, and synchronous boost converters, the LM5108’s high-frequency drive capability and precise dead-time optimization can significantly improve power conversion efficiency.

3. Auxiliary Inverters

In applications such as automotive auxiliary inverters and industrial inverters, the LM5108’s compact package and robust negative voltage tolerance help enable designs with high power density and high reliability.

IV. LM5108 Technical Specifications at a Glance

Maximum Switching Node Voltage (HS): 100 V

Absolute Maximum Boot Voltage (BOOT): 110 V

Sink Current (IOL): 2.6A

Source Current (IOH): 1.6A

Operating Voltage Range (VDD): 5.5V ~ 16V

Typical Propagation Delay: 20ns

Rise Time (1000pF Load): 11ns

Fall Time (1000pF Load): 8ns

Delay Matching: 1 ns

Quiescent Current (Disabled): 7 µA

Maximum Negative Voltage on HS Pin: –7 V

Package: VSON-10 (3 mm × 3 mm)

Operating Temperature Range: –40°C to +125°C

V. Mingjiada—Your Trusted LM5108 Supply Partner

Mingjiada Electronics has long been committed to providing high-quality electronic component supply services to customers worldwide. As a supplier of the LM5108 gate driver, Mingjiada promises:

Brand-new, genuine products: All LM5108 devices are sourced through official channels and are of reliable quality

Stable, in-stock supply: We guarantee continuous supply to meet customer needs during both R&D and mass production phases

Flexible Supply Solutions: We support both sample procurement and bulk orders to meet project needs at every stage

Whether you are designing the next generation of high-performance motor drivers, developing compact power tools, or optimizing switch-mode power supply and auxiliary inverter solutions, the LM5108 will deliver comprehensive improvements in efficiency, reliability, and power density for your designs.

VI. Conclusion

As a flagship device in Texas Instruments’ gate driver product line, the LM5108 combines high drive capability, ultra-low latency, a compact package, an integrated bootstrap diode, and multiple protection features, making it an ideal choice for 100V-class half-bridge driver applications.

Mingjiada Electronics now offers the full range of LM5108 series products. Engineers and buyers are welcome to contact us for pricing, samples, and volume quotes.

Tags: LM5108DRCR, LM5108DRC, LM5108DR, LM5108D, LM5108