Overview
The LM5109BSD from Texas Instruments is a high-voltage, 1-A peak half-bridge gate driver designed to drive both the high-side and low-side N-channel MOSFETs in synchronous buck or half-bridge configurations. This device is cost-effective and features robust level shift technology that operates at high speed while consuming low power. It provides clean level transitions from the control input logic to the high-side gate driver and includes undervoltage lockout (UVLO) protection on both the low-side and high-side power rails.
Key Specifications
| Parameter | Value |
|---|---|
| Output Current | 1 A (1.0 A Sink and 1.0 A Source) |
| Supply Voltage | 8 V to 14 V |
| Bootstrap Supply Voltage | Up to 108 V DC |
| Logic Type | TTL and CMOS-compatible |
| Pin Count | 8 |
| Package Type | 8-Pin SOIC and 8-Pin WSON |
| Topology | Half Bridge |
| Propagation Times | 30 ns Typical |
| Rise and Fall Times | 15 ns Typical for 1000-pF Load |
| Propagation Delay Matching | 2 ns Typical |
| Mounting Type | Surface Mount |
| Dimensions | 4 x 4 x 0.8 mm |
Key Features
- Drives both high-side and low-side N-channel MOSFETs in synchronous buck or half-bridge configurations.
- 1-A peak output current with 1.0-A sink and 1.0-A source capabilities.
- Inputs compatible with independent TTL and CMOS logic thresholds.
- Bootstrap supply voltage up to 108 V DC.
- Fast propagation times (30 ns typical) and excellent propagation delay matching (2 ns typical).
- Drives 1000-pF load with 15-ns rise and fall times.
- Undervoltage lockout (UVLO) protection on both low-side and high-side power rails.
- Low power consumption and robust level shift technology.
- Available in 8-pin SOIC and thermally-enhanced 8-pin WSON packages.
Applications
The LM5109BSD is suitable for a variety of high-voltage applications, including:
- Synchronous buck converters.
- Half-bridge configurations.
- Power supplies requiring high efficiency and reliability.
- Motor control and drive systems.
- Industrial power systems and renewable energy applications.
Q & A
- What is the output current capability of the LM5109BSD?
The LM5109BSD has a 1-A peak output current with 1.0-A sink and 1.0-A source capabilities. - What is the recommended supply voltage range for the LM5109BSD?
The recommended supply voltage range is from 8 V to 14 V. - What type of logic inputs does the LM5109BSD support?
The LM5109BSD supports TTL and CMOS-compatible input thresholds. - What is the maximum bootstrap supply voltage for the LM5109BSD?
The maximum bootstrap supply voltage is up to 108 V DC. - What are the typical propagation times for the LM5109BSD?
The typical propagation times are 30 ns. - How does the LM5109BSD handle undervoltage conditions?
The LM5109BSD includes undervoltage lockout (UVLO) protection on both the low-side and high-side power rails. - What are the package options available for the LM5109BSD?
The device is available in 8-pin SOIC and thermally-enhanced 8-pin WSON packages. - What is the typical rise and fall time for a 1000-pF load?
The typical rise and fall times are 15 ns for a 1000-pF load. - What is the propagation delay matching for the LM5109BSD?
The propagation delay matching is typically 2 ns. - What kind of mounting type does the LM5109BSD use?
The LM5109BSD uses surface mount technology.
