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MAX20078

MAX20078

同步buck、高亮度LED控制器

业界第一款具有超快响应和伪定频调节器的汽车级Buck控制器

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概述

说明

MAX20078为高压、同步、n沟道MOSFET控制器，适用于高电流buck LED驱动器。器件采用专有的平均电流模式控制结构调节电感电流。该控制方法不需要任何控制环路补偿，同时能够维持接近恒定的开关频率。通过检测底部同步n沟道MOSFET中的电流检测电感电流，不要求检测任何高压电流。器件工作在4.5V至65V较宽输入电压范围。器件设计用于高频操作，可工作在高达1MHz开关频率。高边和低边栅极驱动器具有2A峰值源出和吸入电流能力。驱动器电路也包括逻辑电路，提供自适应非重叠定时，防止瞬态期间的贯通电流。器件包括模拟和PWM调光。器件包括5V VCC稳压器，能够为外部电路提供10mA电流。器件也包括电流监测器，可提供与电感电流成比例的模拟电压。器件具有故障标识，指示输出开路和短路。保护特性包括电感限流保护、过压保护和热关断。MAX20078采用节省空间(3mm × 3mm)的16引脚TQFN封装或16引脚TSSOP封装，工作在-40°C至+125°C汽车级温度范围。

设计解决方案: DS52-Achieve Superior Automotive Exterior Lighting with a High-Power Buck LED Controller ›


MAX20078: Simplified Schematic MAX20078: Simplified Schematic 放大+

关键特性

  • 适用于汽车领域：通过AEC-Q100认证
  • 较宽输入电压范围：4.5V至65V
  • 设计简单
    • 无补偿元件
    • 可编程开关频率
  • 较宽调光比支持高对比度
    • 模拟调光
    • PWM调光
  • 适合矩阵照明
    • 灯串中个别LED短路/开路时可保持电流稳定
    • 超快响应控制环路防止过冲和下冲
  • 故障检测和保护
    • 过压保护
    • 开路和短路检测
    • 低功耗关断模式
    • 热关断
    • 电感电流监测器

应用

  • 汽车前灯
  • 汽车矩阵灯
  • 恒流调节器
  • 抬头显示

参数规格

Part NumberRegulation TopologyMax. No. of LEDsLED ChannelsLED ConfigurationILED per Channel
(A)		PWM Dimming Freq.
(kHz)		Dimming RatioDimming ControlVCURR_SENSE
(mV)		POUT
(W)		VIN
(V)		VIN
(V)		ICC
(mA)		LED String Volt.
(V)		Oper. Freq.
(kHz)		Package/PinsBudgetary
Price
maxmaxmaxminmaxmaxmaxSee Notes
MAX20078 Inductor Based151Series3020100000
Analog
Digital
PWM
2001004.5655060
250
262
300
500
750
1000
1200
1500
2000
2100
2200
4000
TQFN-CU/16
TSSOP/16
$1.92 @1k
查看所有LED Drivers (81)
Pricing Notes:
价格仅供参考，用于同类产品的比较。所提供报价为美元，需要依汇率折合成人民币。该价格将因当地关税、税率和汇率而异。有关特定订购量和指定版本的报价和供货问题，请参考：价格与供货网站或与指定代理商联系。

设计资源


MAX20078EVKIT: MAX20078评估板

质量和环境数据

申请可靠性报告: MAX20078 
无铅封装的锡（Sn）晶须报告

其它资源

Design Solution: Driver Monitoring Systems Need a New Breed of IR-LED Drivers ›

Blogs Driving Greater Performance and Safety from Advanced Automotive Lighting

Design Solution: Achieve Superior Automotive Exterior Lighting with a High-Power Buck LED Controller ›

质量与环境

型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C  

备注： 通过技术手段对故障率进行汇总，并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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参考设计

类型 编号 标题
评估板9343MAX20078EVKIT MAX20078评估板