Overview
The LM5109BMAX, produced by Texas Instruments, is a cost-effective, high-voltage gate driver designed to drive both the high-side and the low-side N-channel MOSFETs in a synchronous buck or a half-bridge configuration. This device is particularly useful in applications requiring high voltage and high current switching, such as power supplies, motor drives, and other high-power electronic systems. The LM5109BMAX features a floating high-side driver capable of working with rail voltages up to 90 V and includes robust level shift technology for high-speed operation with low power consumption.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Peak Output Current | 1 A (1.0 A Sink, 1.0 A Source) | A |
| Bootstrap Supply Voltage | Up to 108 V DC | V |
| Propagation Delay | 30 ns (Typical) | ns |
| Rise and Fall Times | 15 ns (Typical) for 1000 pF Load | ns |
| Delay Matching | 2 ns (Typical) | ns |
| Undervoltage Lockout (UVLO) | Yes, on both low-side and high-side power rails | |
| Input Compatibility | TTL and CMOS Compatible | |
| Package Types | 8-Pin SOIC, 8-Pin WSON | |
| Operating Temperature | -40°C to 125°C | °C |
Key Features
- Drives both high-side and low-side N-channel MOSFETs in synchronous buck or half-bridge configurations.
- Independent TTL and CMOS-compatible input thresholds.
- Robust level shift technology for high-speed operation with low power consumption.
- Undervoltage lockout (UVLO) on both low-side and high-side power rails.
- Fast propagation times and excellent delay matching.
- Low power consumption and high noise immunity.
- Available in 8-pin SOIC and thermally-enhanced 8-pin WSON packages.
Applications
- Synchronous buck converters.
- Half-bridge and full-bridge configurations.
- Power supplies and DC-DC converters.
- Motor drives and power inverters.
- High-power electronic systems requiring high voltage and high current switching.
Q & A
- What is the peak output current of the LM5109BMAX?
The peak output current of the LM5109BMAX is 1 A, with 1.0 A sink and 1.0 A source capabilities.
- What is the maximum bootstrap supply voltage for the LM5109BMAX?
The maximum bootstrap supply voltage for the LM5109BMAX is up to 108 V DC.
- What are the typical rise and fall times for the LM5109BMAX?
The typical rise and fall times for the LM5109BMAX are 15 ns for a 1000 pF load.
- Does the LM5109BMAX have undervoltage lockout (UVLO) protection?
Yes, the LM5109BMAX has UVLO protection on both the low-side and high-side power rails.
- What are the input compatibility options for the LM5109BMAX?
The inputs of the LM5109BMAX are compatible with both TTL and CMOS logic.
- In what packages is the LM5109BMAX available?
The LM5109BMAX is available in 8-pin SOIC and thermally-enhanced 8-pin WSON packages.
- What is the operating temperature range for the LM5109BMAX?
The operating temperature range for the LM5109BMAX is -40°C to 125°C.
- What types of applications is the LM5109BMAX suitable for?
The LM5109BMAX is suitable for synchronous buck converters, half-bridge and full-bridge configurations, power supplies, motor drives, and other high-power electronic systems.
- How does the level shift technology in the LM5109BMAX operate?
The level shift technology in the LM5109BMAX operates at high speed while consuming low power, providing clean level transitions from the control input logic to the high-side gate driver.
- What is the recommended bias supply voltage range for the LM5109BMAX?
The recommended bias supply voltage range for the LM5109BMAX is from 8 V to 14 V, with a recommended margin to allow for transient voltage spikes.
