Overview
The LM5105SD from Texas Instruments is a high-voltage 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 part of the latest generation of high-voltage gate drivers and is capable of operating with rail voltages up to 100 V. It features a single TTL-compatible input and an enable input pin, allowing for precise control over the MOSFETs. The LM5105SD also includes an integrated bootstrap diode and robust level shift technology, ensuring high-speed operation with low power consumption.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | WSON (10-pin) | |
| Operating Temperature Range | -40 to 125 | °C |
| Peak Gate Drive Current | 1.8 A | |
| Bootstrap Supply Voltage Range | Up to 118 V DC | |
| Rise and Fall Time | 15 ns | |
| Turnoff Propagation Delays | 26 ns (Typical) | |
| Supply Rail Undervoltage Lockout | Yes | |
| Power Consumption | Low | |
| Output Capacitance Drive | 1000 pF |
Key Features
- Drives both high-side and low-side N-Channel MOSFETs
- 1.8-A peak gate drive current
- Bootstrap supply voltage range up to 118 V DC
- Integrated bootstrap diode
- Single TTL-compatible input
- Programmable turn-on delays (dead time)
- Enable input pin
- Fast turnoff propagation delays (26 ns typical)
- Drives 1000 pF with 15-ns rise and fall time
- Supply rail undervoltage lockout
- Low power consumption
- Thermally enhanced 10-pin WSON package (4 mm × 4 mm)
Applications
- Solid-state motor drives
- Half- and full-bridge power converters
- Push-pull, two-switch forward, and active clamp topologies
Q & A
- What is the LM5105SD used for?
The LM5105SD is used to drive both the high-side and low-side N-Channel MOSFETs in synchronous buck or half-bridge configurations.
- What is the maximum operating temperature of the LM5105SD?
The maximum operating temperature of the LM5105SD is 125°C.
- What is the peak gate drive current of the LM5105SD?
The peak gate drive current of the LM5105SD is 1.8 A.
- Does the LM5105SD have an integrated bootstrap diode?
Yes, the LM5105SD has an integrated bootstrap diode.
- How is the dead time programmed in the LM5105SD?
The dead time in the LM5105SD is programmed using a resistor at the RDT pin, allowing for adjustments from 100 ns to 600 ns.
- What is the typical turnoff propagation delay of the LM5105SD?
The typical turnoff propagation delay of the LM5105SD is 26 ns.
- Does the LM5105SD have undervoltage lockout protection?
Yes, the LM5105SD has supply rail undervoltage lockout protection.
- What is the package type and size of the LM5105SD?
The LM5105SD is offered in a thermally enhanced 10-pin WSON package (4 mm × 4 mm).
- What are some common applications of the LM5105SD?
The LM5105SD is commonly used in solid-state motor drives, half- and full-bridge power converters, and other topologies such as push-pull and active clamp.
- Is the LM5105SD still in production?
No, the LM5105SD is no longer manufactured, but substitutes or alternative products may be available.
