Overview
The LM5105SDX is a high-voltage gate driver designed by Texas Instruments to drive both the high-side and low-side N-Channel MOSFETs in synchronous buck or half-bridge configurations. This device is capable of operating with rail voltages up to 100 V and features a single TTL-compatible input. It includes a high-voltage diode for charging the high-side gate-drive bootstrap capacitor and offers programmable turn-on delays (dead time) through tightly matched turn-on delay circuits. The LM5105SDX is packaged in a thermally enhanced 10-pin WSON (4 mm × 4 mm) package, ensuring efficient thermal dissipation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | 10-Pin WSON (DPR) | |
| Operating Temperature Range | -40 to 125 | °C |
| Peak Gate Drive Current | 1.8 A | |
| Bootstrap Supply Voltage Range | Up to 118 V DC | |
| Input Type | Single TTL Compatible | |
| Turnoff Propagation Delays | 26 ns (Typical) | |
| Rise and Fall Time | 15 ns (CL = 1000 pF) | |
| Supply Rail Undervoltage Lockout | Yes | |
| Power Consumption | Low | |
| Junction Temperature Range | -40 to 125 | °C |
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.
Q & A
- What is the primary function of the LM5105SDX?
The LM5105SDX 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. - What is the maximum operating temperature range for the LM5105SDX?
The operating temperature range is -40°C to 125°C. - What is the peak gate drive current of the LM5105SDX?
The peak gate drive current is 1.8 A. - What is the bootstrap supply voltage range for the LM5105SDX?
The bootstrap supply voltage range is up to 118 V DC. - Does the LM5105SDX have an integrated bootstrap diode?
Yes, it has an integrated bootstrap diode. - What type of input does the LM5105SDX support?
The LM5105SDX supports a single TTL-compatible input. - Can the turn-on delays (dead time) be programmed on the LM5105SDX?
Yes, the turn-on delays (dead time) can be programmed using a single external resistor. - What is the typical turnoff propagation delay of the LM5105SDX?
The typical turnoff propagation delay is 26 ns. - How does the LM5105SDX handle undervoltage conditions?
The LM5105SDX features supply rail undervoltage lockout, which disables the gate driver when either the low-side or the bootstrapped high-side supply voltage is below the operating threshold. - In what package is the LM5105SDX offered?
The LM5105SDX is offered in a thermally enhanced 10-pin WSON plastic package (4 mm × 4 mm).
