Overview
The LM5109ASDX, 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 synchronous buck or half-bridge configurations. This device is particularly suited for applications requiring high voltage and high current handling. The floating high-side driver can operate with rail voltages up to 90V, and the outputs are independently controlled with TTL compatible input thresholds. The robust level shift technology ensures high-speed operation with low power consumption and clean level transitions from the control input logic to the high-side gate driver. Under-voltage lockout (UVLO) is provided on both the low-side and the high-side power rails to ensure reliable operation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Peak Output Current | 1.0 A (Sink / 1.0 A Source) | A |
| Bootstrap Supply Voltage | Up to 108 V DC | V |
| Input Type | Independent TTL Compatible Inputs | |
| Propagation Times | 30 ns Typical | ns |
| Rise and Fall Times | 15 ns (CL = 1000 pF) | ns |
| Delay Matching | 2 ns Typical | ns |
| Operating Temperature | -40°C to 125°C (TJ) | °C |
| Package | SOIC-8, WSON-8 (4x4 mm) | |
| Input Voltage Thresholds | 0.8 V to 2.2 V | V |
| Thermal Resistance (θJA) | 160 °C/W (SOIC), 40 °C/W (WSON) | °C/W |
Key Features
- Drives both high-side and low-side N-Channel MOSFETs in synchronous buck or half-bridge configurations.
- 1A peak output current (1.0A sink / 1.0A source).
- Independent TTL compatible inputs.
- Bootstrap supply voltage up to 108V DC.
- Fast propagation times (30 ns typical) and excellent propagation delay matching (2 ns typical).
- Drives 1000 pF load with 15ns rise and fall times.
- Under-voltage lockout (UVLO) on both low-side and high-side power rails.
- Low power consumption.
- Pin compatible with ISL6700.
- Available in industry standard SOIC-8 and thermally enhanced WSON-8 packages.
Applications
- Current Fed Push-Pull Converters.
- Half and Full Bridge Power Converters.
- Solid State Motor Drives.
- Two Switch Forward Power Converters.
Q & A
- What is the peak output current of the LM5109ASDX?
The peak output current is 1.0 A (1.0 A sink / 1.0 A source).
- What is the maximum bootstrap supply voltage for the LM5109ASDX?
The maximum bootstrap supply voltage is up to 108 V DC.
- What type of input thresholds does the LM5109ASDX have?
The LM5109ASDX has independent TTL compatible input thresholds.
- What are the typical propagation times for the LM5109ASDX?
The typical propagation times are 30 ns.
- What is the rise and fall time for a 1000 pF load?
The rise and fall times are 15 ns for a 1000 pF load.
- Does the LM5109ASDX have under-voltage lockout protection?
- What are the available package types for the LM5109ASDX?
The device is available in SOIC-8 and thermally enhanced WSON-8 packages.
- What is the operating temperature range for the LM5109ASDX?
The operating temperature range is -40°C to 125°C (TJ).
- Is the LM5109ASDX pin compatible with other devices?
- What are some typical applications for the LM5109ASDX?
Typical applications include current fed push-pull converters, half and full bridge power converters, solid state motor drives, and two switch forward power converters.
