Overview
The LMG1205YFXT is a high-performance, half-bridge gate driver IC designed by Texas Instruments to drive both high-side and low-side enhancement mode Gallium Nitride (GaN) FETs. This device is optimized for use in synchronous buck, boost, or half-bridge configurations. It features an integrated 100-V bootstrap diode and independent inputs for the high-side and low-side outputs, providing maximum control flexibility. The high-side bias voltage is generated using a bootstrap technique and is internally clamped at 5 V to prevent the gate voltage from exceeding the maximum gate-source voltage rating of the GaN FETs. The inputs are TTL logic compatible and can handle input voltages up to 14 V regardless of the VDD voltage. The LMG1205YFXT is available in a compact 12-pin DSBGA package, which minimizes package inductance and enhances overall efficiency and effectiveness.
Key Specifications
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| Package | DSBGA (12-pin) | Operating Temperature Range (°C) | -40 to 125 |
| Input VCC (min) (V) | 4.5 | Input VCC (max) (V) | 5.5 |
| Peak Output Current (A) | 5 | Undervoltage Lockout (typ) (V) | 4 |
| Propagation Delay Time (µs) | 0.035 | Rise Time (ns) | 7 |
| Fall Time (ns) | 3.5 | Iq (mA) | 0.09 |
| Input Threshold | TTL | Channel Input Logic | TTL |
| Negative Voltage Handling at HS Pin (V) | -5 | Features | Bootstrap supply voltage clamp, Split outputs on high and low side |
Key Features
- Independent high-side and low-side TTL logic inputs
- 1.2-A peak source, 5-A sink current
- High-side floating bias voltage rail operates up to 100 VDC
- Internal bootstrap supply voltage clamping
- Split outputs for adjustable turn-on, turn-off strength
- 0.6-Ω pulldown, 2.1-Ω pullup resistance
- Fast propagation times (35 ns typical)
- Excellent propagation delay matching (1.5 ns typical)
- Supply rail undervoltage lockout
- Low power consumption
- Strong sink capability to maintain the gate in the low state during switching
Applications
- Current-fed push-pull converters
- Half and full-bridge converters
- Synchronous buck converters
- Two-switch forward converters
- Forward with active clamp converters
- Automotive and industrial applications for controlling power distribution to various loads
- High-frequency, high-efficiency power conversion applications such as DC-DC converters and motor drives
Q & A
- What is the LMG1205YFXT used for?
The LMG1205YFXT is used to drive high-side and low-side enhancement mode Gallium Nitride (GaN) FETs in synchronous buck, boost, or half-bridge configurations.
- What is the package type of the LMG1205YFXT?
The LMG1205YFXT is available in a 12-pin DSBGA package.
- What are the key features of the LMG1205YFXT?
Key features include independent high-side and low-side TTL logic inputs, 1.2-A peak source and 5-A sink current, internal bootstrap supply voltage clamping, and split outputs for adjustable turn-on and turn-off strength.
- What is the operating temperature range of the LMG1205YFXT?
The operating temperature range is -40°C to 125°C.
- What is the propagation delay time of the LMG1205YFXT?
The propagation delay time is typically 35 ns.
- Does the LMG1205YFXT have undervoltage lockout protection?
Yes, the LMG1205YFXT has supply rail undervoltage lockout protection.
- What are the typical applications of the LMG1205YFXT?
Typical applications include current-fed push-pull converters, half and full-bridge converters, synchronous buck converters, and automotive and industrial power distribution systems.
- How does the LMG1205YFXT handle input voltages?
The inputs are TTL logic compatible and can handle input voltages up to 14 V regardless of the VDD voltage.
- What is the purpose of the internal bootstrap supply voltage clamping in the LMG1205YFXT?
The internal bootstrap supply voltage clamping prevents the gate voltage from exceeding the maximum gate-source voltage rating of the GaN FETs.
- Does the LMG1205YFXT support high-frequency operations?
Yes, the LMG1205YFXT can operate up to several MHz.
