LMG708B0QRXRQ1 - 80V 20A GaN Buck Converter | Texas Instruments
MPN: LMG708B0QRXRQ1 ✓ 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 LMG708B0QRXRQ1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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Request AlternativesLMG708B0QRXRQ1 Maximum Ratings & Electrical Characteristics
| Topology | Synchronous Buck DC/DC Converter |
| Technology | Integrated GaN FETs, near-zero deadtime switching |
| Maximum Output Current | 20 A |
| Input Voltage Range | 5 V to 80 V |
| Output Voltage Range | 1 V to 55 V (adjustable) or fixed 5 V / 12 V |
| Maximum Junction Temperature | 125 C |
| Package | [DATA_NEEDED: package type and dimensions] |
| Mounting Type | Surface Mount |
| Automotive Qualification | AEC-Q100 (Q1 grade) |
| Number of Outputs | 1 |
| Switching Frequency | [DATA_NEEDED: switching frequency] |
| RDS(on) | [DATA_NEEDED: GaN FET on-resistance] |
| Operating Temperature | [DATA_NEEDED: ambient operating range] |
| Quiescent Current | [DATA_NEEDED: quiescent current] |
| Control Topology | [DATA_NEEDED: control topology] |
| RoHS Status | [DATA_NEEDED: RoHS status] |
LMG708B0QRXRQ1 [data_needed: package type and dimensions] Pin Configuration Guide
Complete pinout information for LMG708B0QRXRQ1 ([data_needed: package type and dimensions] package). 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.
![[data_needed: package type and dimensions] package pinout diagram for LMG708B0QRXRQ1](/assets/package-diagrams/default.svg?v=1787929954)
No detailed pinout data available for LMG708B0QRXRQ1.
Refer to the datasheet for full pin configuration.
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
LMG708B0QRXRQ1 is suitable for 6 applications: 48V Automotive Power Distribution, Industrial 48V Robotics and Automation, Telecom and Server Power Stages, High-Current Point-of-Load Conversion, Solar and Energy Storage Input Conversion, Wireless Infrastructure and Test Equipment.
48V Automotive Power Distribution
In modern 48V vehicle architectures, the LMG708B0QRXRQ1 converts the 48V bus down to 12V or 5V point-of-load rails with up to 20A of output current. Its 80V maximum input provides headroom for load-dump transients, and the Q1 AEC-Q100 qualification supports automotive deployment. The integrated GaN FETs with near-zero deadtime switching keep efficiency high at high step-down ratios, reducing heatsinking and enabling compact zonal power modules.
Recommended
Industrial 48V Robotics and Automation
Robotics and factory automation systems increasingly use 48V motor and logic buses. The LMG708B0QRXRQ1 steps 48V down to 12V/5V rails at up to 20A with very high efficiency, thanks to its integrated low-RDS(on) GaN FETs and 125C junction rating. Its high power density allows smaller control boards, while the wide 5V-80V input tolerates industrial supply variation and inductive transients common on factory floors.
Recommended
Telecom and Server Power Stages
In telecom rectifiers and server baseboards, intermediate bus voltages in the 36V-60V range must be converted efficiently to point-of-load rails. The LMG708B0QRXRQ1 accepts 5V-80V inputs and delivers up to 20A, with fixed 5V and 12V output options simplifying standard rail designs. Near-zero deadtime GaN switching reduces losses at the high switching frequencies these dense power systems require, cutting total solution size.
Recommended
High-Current Point-of-Load Conversion
Where a single high-current rail is needed from a wide-range input, the LMG708B0QRXRQ1 provides a complete synchronous buck solution in one package - controller, gate drivers, and GaN power FETs integrated. Adjustable output from 1V to 55V covers logic, analog, and battery-charging rails up to 20A. Integration removes external power-stage layout parasitics, improving switching-node integrity and easing EMI compliance compared with controller-plus-discrete-FET designs.
Recommended
Solar and Energy Storage Input Conversion
Solar string inputs and battery stacks present wide-voltage sources where the LMG708B0QRXRQ1 5V-80V input range and 1V-55V adjustable output are valuable. Converting panel or stack voltage to system rails at up to 20A with GaN efficiency preserves harvested energy, and the 125C junction rating suits enclosed outdoor electronics. Verify input transient suppression for lightning and switching surge conditions per TI reference design guidance.
Recommended
Wireless Infrastructure and Test Equipment
RF amplifiers and instruments need clean, efficient supplies at moderate voltages and high current. The LMG708B0QRXRQ1 fixed 12V or adjustable output options feed PA rails directly from 24V-48V distribution buses at up to 20A. GaN near-zero deadtime operation minimizes switching ripple and EMI, easing filtering for noise-sensitive analog loads, while the compact integrated solution fits within dense instrument chassis.
Recommended
Recommended Products Summary
Engineering reference data for LMG708B0QRXRQ1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LMG708B0QRXR | LM70880QRRXRQ1 | TPS54360QDDARQ1 |
|---|---|---|---|---|
| Package | [DATA_NEEDED: package type] | [DATA_NEEDED] | 29-PowerVFQFN | SO-8 PowerPAD (DDA) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Voltage Range | 5 V to 80 V | 5 V to 80 V | 3.5 V to 80 V | 4.5 V to 60 V |
| Output Current | 20 A | 20 A | 8 A | 3.5 A |
| Output Voltage Range | 1 V to 55 V or fixed 5 V / 12 V | 1 V to 55 V or fixed 5 V / 12 V | 0.8 V adjustable or fixed 3.3 V / 5 V / 12 V | 0.8 V adjustable |
| Power FET Technology | Integrated GaN FETs | Integrated GaN FETs | Integrated silicon FETs | Integrated silicon FETs |
| Max Junction Temperature | 125 C | 125 C | [DATA_NEEDED] | [DATA_NEEDED] |
| Automotive Qualification | AEC-Q100 (Q1) | No (standard grade) | AEC-Q100 (Q1) | AEC-Q100 (Q1) |
| Price (1 pc, as of 2026-08-29) | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- Integrated GaN FETs with near-zero deadtime switching (vs LM70880QRRXRQ1)
- 80V input with 55V output capability (vs TPS54360QDDARQ1)
- Trade-off: fewer lower-current drop-in options (vs TPS54360QDDARQ1)
Design Notes
At 20A output the LMG708B0QRXRQ1 dissipates conduction and switching losses in its integrated GaN FETs, rated to a maximum junction temperature of 125C. Use heavy PCB copper pours on the exposed thermal connection and the power stage nodes, select a low-DCR inductor, and simulate junction temperature at worst-case VIN, load, and ambient. High step-down ratios (80V to low rails) increase switching-related loss; consider lowering switching frequency or improving airflow at full load.
Because the GaN power FETs are integrated, switching-node parasitics are largely set by PCB layout. Keep the input ceramic capacitor loop as short and wide as possible, place the inductor directly at the switch node, and pour solid ground planes under the IC. Follow the LMG708B0 datasheet layout section and TI reference design (e.g., the LMG708B0 evaluation module guidance) exactly; near-zero deadtime GaN switching leaves little margin for sloppy hot-loop design.
Never exceed the 80V maximum input voltage - automotive 48V systems can experience transients approaching or exceeding this limit, so add appropriate TVS/transient suppression on the input. Do not attempt to deliver full 20A without verifying thermal performance in the final enclosure. Set the output no higher than 55V, and use the feedback divider per the datasheet formula when operating in adjustable mode.
Compliance Information
Q1 suffix indicates AEC-Q100 automotive qualification per TI naming convention. RoHS/REACH status should be confirmed on the TI product page quality section.
