TI LMG1020低边GaN FET驱动器解决方案

TI公司的LMG102是单个低边GaN和Si MOSFET驱动器，高达60MHz工作频率，输入脉冲宽度１ns，传输时延典型值2.5ns，上升和下降时间为400ps，7A峰值源电流和5A峰值沉电流，5V工作电压，主要用在激光雷达（LiDAR），TOF激光驱动器，面部识别，E类无线充电器，VHF谐振电源转换器，GaN同步整流器和增强现实（AR）。本文介绍了LMG1020主要特性，框图和典型应用电路图以及高压评估板LMG1020-HB-EVM主要特性，框图，电路图，材料清单和PCB设计图。

The LMG1020 device is a single， low-side driverdesigned for driving GaN FETs and logic-levelMOSFETs in high-speed applications includingLiDAR， time-of-flight， facial recognition， and anypower converters involving low side drivers. Thedesign simplicity of the LMG1020 enables extremelyfast propagation delays of 2.5 nanoseconds andminimum pulse width of 1 nanosecond. The drivestrength is independently adjustable for the pull-upand pull-down edges by connecting external resistorsbetween the gate and OUTH and OUTL， respectively.

The driver features undervoltage lockout （UVLO） andovertemperature protection （OTP） in the event ofoverload or fault conditions.

0.8-mm × 1.2-mm WCSP package of LMG1020minimizes gate loop inductance and maximizespower density in high-frequency applications.

LMG102主要特性：

• Low-Side， Ultra-Fast Gate Driver for GaN andSilicon FETs

• 1 ns Minimum Input Pulse Width

• Up to 60 MHz Operation

• 2.5 ns Typical， 4.5 ns Maximum PropagationDelay

• 400 ps Typical Rise and Fall Time

• 7-A Peak Source and 5-A Peak Sink Currents

• 5-V Supply Voltage

• UVLO and Overtemperature Protection

• 0.8 mm × 1.2 mm WCSP Package

LMG102应用：

• LiDAR

• Time-of-Flight Laser Drivers

• Facial Recognition

• Class-E Wireless Chargers

• VHF Resonant Power Converters

• GaN-Based Synchronous Rectifier

• Augmented Reality

图1. LMG102功能框图

图2. LMG102简化LiDAR驱动级框图

图3. LMG102典型应用电路图

通用高压评估板LMG1020-HB-EVM

The LMG1020-HB-EVM is designed to evaluate the LMG1020 Nano-second low-side driver for GaN FETs.

This EVM consists of one Gallium Nitride （GaN） eFET driven by one LMG1020 and with the sourceconnected to a resistive load emulating a laser diode for LiDAR （Light Detection And Ranging）applications.

The guide shows a circuit and the list of materials describing how to power the board up and how to setthe board up for a certain regulation voltage. The EVM board is designed to accelerate the evaluation ofthe LMG1020.

This board is not intended to be used as a standalone product but it intended to evaluate the switchingperformance of LMG1020.

This EVM guide describes correct operation and measurement of the EVM， as well as the EVMconstruction and typical performance.

The LMG1020-EVM is a small， easy-to-use power stage with integrated resistive load. It takes a shortpulseinput that can either be buffered （and shorten further）， or passed directly to the power stage.

The input pulse is signal is used to pulse the current through the load， to achieve 1-2ns wide currentpulses， which are the state-of-the-art target for LiDAR systems.

The EVM features a LMG1020 low side nano-second driver， driving a single EPC2039 FET referenced toground and with the drain connected to the resistive load.

The load is split between two current loops to reduce the effective inductance. The board has larger padson which a laser diode of choice can be mounted.

图4. LMG102 LiDAR功率级电路图

评估板LMG1020-HB-EVM电性能指标：

图5.评估板LMG1020-HB-EVM外形图

图6.评估板LMG1020-HB-EVM电路图

评估板LMG1020-HB-EVM材料清单：

图7.评估板LMG1020-HB-EVM PCB设计图（1）：顶层和元件图

图8.评估板LMG1020-HB-EVM PCB设计图（2）：底层和元件图