LMG708B0RXR - 20A GaN Synchronous Buck 80VIN | TI
MPN: LMG708B0RXR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
Drop-in alternatives for LMG708B0RXR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LMG708B0RXR-Q1
✅ Drop-In📋 Reference alternative (not in catalog)
LMG708A0RXR
⚡ Same Package📋 Reference alternative (not in catalog)
LMG5126RXR
⚡ Same Package✓ In Stock
$1.6 / Unit
View Datasheet →LMG708B0RXR Maximum Ratings & Electrical Characteristics
| Product Type | GaN synchronous buck DC/DC converter |
| Output Current | 20 A |
| Input Voltage Range | 5 V to 80 V |
| Adjustable Output Voltage Range | 1 V to 55 V |
| Fixed Output Voltage Options | 5 V or 12 V |
| Integrated FET Technology | GaN with low RDS(on) |
| Maximum Junction Temperature | 125 °C |
| Package | VQFN-28 (RXR) |
| Mounting Type | Surface Mount |
| Number of Pins | 28 |
| Switching Frequency | [DATA_NEEDED: switching frequency] |
| RDS(on) | [DATA_NEEDED: RDS(on) value] |
| Efficiency | [DATA_NEEDED: efficiency at nominal VIN/VOUT] |
| Quiescent Current | [DATA_NEEDED: quiescent current] |
| Operating Temperature Range | [DATA_NEEDED: operating temperature range] |
| RoHS | [DATA_NEEDED: RoHS status] |
| AEC-Q100 | Not qualified (standard part); see Q1 variant |
LMG708B0RXR vqfn-28 (rxr) Pin Configuration Guide
Complete pinout information for LMG708B0RXR (vqfn-28 (rxr) package) with 28 pins. This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for LMG708B0RXR.
Refer to the datasheet for full pin configuration.
Estimated pin count: 28 pins (power package)
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
LMG708B0RXR is suitable for 6 applications: Industrial 48V Bus Converters, Telecom and Networking Power, Server and Datacenter Power, Automotive 48V Mild-Hybrid and Light EV, Battery-Powered Portable/Industrial Equipment, High-Current LED Lighting Drivers.
Industrial 48V Bus Converters
The LMG708B0RXR converts 48V distribution buses down to 12V or 5V at up to 20A with integrated GaN FETs. Its 5-80V input range handles wide industrial voltage transients, while near-zero deadtime reduces switching losses at high frequency. In a typical 48V-to-12V design, the high step-down ratio benefits from low RDS(on) and high-side GaN switching. Use a 10uF-22uF ceramic input capacitor close to VIN and PGND, and a suitable inductor for 20A ripple current.
Recommended
Telecom and Networking Power
Telecom boards often operate from 48V rails and require high-efficiency conversion to 5V for logic circuits. The LMG708B0RXR supports 5V fixed output and up to 20A, with 80V input tolerance for surge protection. Its integrated GaN FETs allow small magnetic components, saving PCB area in densely packed line cards. Place the device close to the load and use a solid ground plane to minimize noise.
Recommended
Server and Datacenter Power
High-density server power shelves use 48V to 12V conversion. The LMG708B0RXR delivers 20A continuous with GaN efficiency, reducing cooling requirements. Near-zero deadtime minimizes body-diode losses, while the 125°C junction rating supports high ambient environments. For 12V output at 20A, power dissipation is dominated by inductor DCR and the low RDS(on) of GaN FETs, so use a low-loss inductor and thermal vias under the exposed pad.
Recommended
Automotive 48V Mild-Hybrid and Light EV
In 48V automotive systems, the LMG708B0RXR-Q1 handles load-dump transients up to 80V and provides 5V/12V rails for control units. The AEC-Q100 qualified version is available for under-hood temperature ranges. High switching frequency and integrated GaN reduce EMI filter size. Ensure input bulk capacitance is sized for 80V transients and prioritize thermal layout around the exposed pad.
Recommended
Battery-Powered Portable/Industrial Equipment
For equipment powered from multi-cell batteries (36V to 72V nominal), the LMG708B0RXR provides regulated lower voltage rails. Its 5-80V input range accommodates battery voltage changes during charging/discharging. The 20A output supports heavy loads, while the adjustable output down to 1V powers low-voltage digital cores. Choose an inductor rated for peak current and low DCR for efficiency.
Recommended
High-Current LED Lighting Drivers
LED lighting can benefit from a constant-current driver created by using the LMG708B0RXR as a buck current source. The wide 1V-55V output range and 20A capability support high-power LED strings. Accurate average current is set with a sense resistor in the feedback path. Thermal management is essential because the LED load must dissipate heat away from the converter; use a robust PCB copper area.
Recommended
Recommended Products Summary
Engineering reference data for LMG708B0RXR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LMG708B0RXR-Q1 | LMG708A0RXR | LMG5126RXR |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | VQFN-28 (RXR) | VQFN-28 (RXR) - same | VQFN-28 (RXR) - verify | VQFN-28 (RXR) - verify |
| Input Voltage Range | 5V to 80V | 5V to 80V | [DATA_NEEDED] | [DATA_NEEDED] |
| Output Current | 20A | 20A | [DATA_NEEDED] | [DATA_NEEDED] |
| Integrated GaN FETs | Yes | Yes | Yes | Yes |
| Output Voltage Options | Adjustable 1V-55V, fixed 5V/12V | Adjustable 1V-55V, fixed 5V/12V | [DATA_NEEDED] | [DATA_NEEDED] |
| Automotive Qualified | No (standard) | Yes (AEC-Q100) | [DATA_NEEDED] | [DATA_NEEDED] |
| Maximum Junction Temperature | 125°C | 125°C | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- Integrated 20A GaN power stage reduces component count (vs LMG708A0RXR)
- 80V input voltage range with integrated GaN FETs (vs Typical silicon MOSFET buck converters)
- Near-zero deadtime switching (vs Silicon-based synchronous buck converters)
Design Notes
At 20A output, thermal design is critical. Even with low RDS(on), high current can produce significant power dissipation. Use a minimum 2-ounce copper pour on all power layers and place 8-12 thermal vias under the exposed thermal pad. Maintain the recommended MSL and reflow profile to avoid package damage. Monitor junction temperature to stay below the 125°C absolute maximum.
Input decoupling must handle the high di/dt of GaN switching. Place multiple 10uF X7R ceramic capacitors directly between VIN and PGND, plus 100nF high-frequency caps. Minimize loop area from input caps to VIN and PGND pins. Keep the SW node copper short and wide, and use a solid ground plane beneath the device.
Do not leave the enable pin floating. Provide a proper sequencing signal or connect through a resistor to VIN if always-on operation is intended. For adjustable output versions, use precision 1% resistor dividers for accurate voltage setting. Always verify input voltage transients stay below the absolute maximum 80V rating, and add a TVS or input capacitance for load-dump protection in automotive systems.
Compliance Information
Compliance information was not included in the verified web data snapshot. The Q1 variant is expected to be AEC-Q100 qualified, but standard LMG708B0RXR is not.
