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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 V_CC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

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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 Number

Regulation Topology

Max. No. of LEDs

LED Channels

LED Configuration

I_LED per Channel
(A)

PWM Dimming Freq.
(kHz)

Dimming Ratio

Dimming Control

V_{CURR_SENSE}
(mV)

P_OUT
(W)

V_IN
(V)

I_CC
(mA)

LED String Volt.
(V)

Oper. Freq.
(kHz)

Package/Pins

Budgetary
Price

max

min

max

See Notes

MAX20078

Inductor Based

Series

100000

Analog

Digital

PWM

200

100

4.5

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 (80)

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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