LMG708B0QRXRQ1 - 80V 20A GaN Buck Converter | Texas Instruments
料号： LMG708B0QRXRQ1 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
LMG708B0QRXRQ1 概述
A synchronous buck converter (also called a step-down switching regulator) is a power management IC that uses switching elements and an inductor to efficiently convert a higher input voltage to a lower output voltage. Within the power supply hierarchy - semiconductor, power management IC, DC/DC converter, buck regulator - synchronous buck converters achieve the highest efficiency by replacing the freewheeling diode with a second actively controlled FET. Integrated GaN FETs push this efficiency further: gallium nitride transistors switch faster and exhibit near-zero reverse-recovery losses compared to silicon MOSFETs, dramatically reducing both switching losses and deadtime requirements.
Key features of the LMG708B0QRXRQ1 include the 20A output capability, the 80V maximum input for industrial and automotive 48V-class rails, low-RDS(on) integrated GaN power stages, and an operating envelope that supports outputs up to 55V. The Q1 suffix indicates Texas Instruments AEC-Q100 automotive qualification discipline, supporting deployment in vehicle power architectures such as 48V-to-12V point-of-load conversion.
Technical strengths center on power density: by combining controller, gate drivers, and GaN FETs in one package, the device eliminates external power stage layout parasitics, minimizes switching-node ringing, and simplifies EMI management. Near-zero deadtime operation avoids the body-diode conduction period that dominates silicon designs, cutting losses at high frequency and high current simultaneously.
Typical applications include 48V automotive and industrial power distribution, high-current point-of-load conversion, telecom and server power stages, and robotics/automation drive supplies where high efficiency and compact size are mandatory.
Design consideration: with 20A of output current, PCB thermal design and inductor selection dominate system performance - follow the TI datasheet layout guidance closely, and as of 2026-08-29 confirm current pricing and stock via authorized distributors.
直接替换替代料： LMG708B0QRXRQ1 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LMG708B0QRXRQ1 （相同外形与封装尺寸） ——差异在于 Output Voltage Range, Topology.
快速对比工具——选择替代料号进行并排对比：
该产品暂无直接替换替代料。
请求替代料LMG708B0QRXRQ1 最大额定值与电气特性
| 拓扑 | Synchronous Buck DC/DC Converter |
| Technology | Integrated GaN FETs, near-zero deadtime switching |
| 最大输出电流 | 20 A |
| 输入电压范围 | 5 V to 80 V |
| 输出电压范围 | 1 V to 55 V (adjustable) or fixed 5 V / 12 V |
| Maximum Junction Temperature | 125 C |
| 安装类型 | Surface Mount |
| Automotive Qualification | AEC-Q100 (Q1 grade) |
| 输出数量 | 1 |
LMG708B0QRXRQ1 standard 引脚配置指南
LMG708B0QRXRQ1（standard 封装）的引脚配置。 该功率器件具有栅极、漏极和源极端子。对于无极性封装，请参阅制造商数据手册以了解确切的引脚 1 方向和封装尺寸细节。常见应用包括电源设计、电机驱动和负载开关。
暂无详细引脚数据： LMG708B0QRXRQ1.
请参阅 数据手册 以查看完整引脚配置。
典型应用
LMG708B0QRXRQ1 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： LMG708B0QRXRQ1 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | LMG708B0QRXR | LM70880QRRXRQ1 | TPS54360QDDARQ1 |
|---|---|---|---|---|
| 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 |
| Automotive Qualification | AEC-Q100 (Q1) | No (standard grade) | AEC-Q100 (Q1) | AEC-Q100 (Q1) |
关键差异点
- Integrated GaN FETs with near-zero deadtime switching （对比 LM70880QRRXRQ1)
- 80V input with 55V output capability （对比 TPS54360QDDARQ1)
- Trade-off: fewer lower-current drop-in options （对比 TPS54360QDDARQ1)
设计说明
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.
合规信息
Q1 suffix indicates AEC-Q100 automotive qualification per TI naming convention. RoHS/REACH status should be confirmed on the TI product page quality section.
