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Automotive 6-Channel Backlight Driver with Boost/SEPIC Controller and Hybrid Dimming

6-Channel 130mA LED Driver Provides Full Diagnostics and Hybrid Dimming

产品详情

主要特征

Parametric specs for LED Drivers
VIN (V) (min) 4.5
VIN (V) (max) 42
Max. No. of LEDs 80
# LED Channels 6
LED Configuration Series-Parallel
ILED per Channel (A) (max) 0.13
PWM Dimming Freq. (kHz) (max) 2
Dimming Ratio (max) 20000
Dimming Control PWM
POUT (W) 40
LED String Volt. (V) (max) 52
Switching Frequency (kHz) 2200
Package/Pins TQFN-CU/24
Budgetary
Price (See Notes)
3.12
缩小

简化框图

Technical Docs

支持和培训

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参量

Parametric specs for LED Drivers
VIN (V) (min) 4.5
VIN (V) (max) 42
Max. No. of LEDs 80
# LED Channels 6
LED Configuration Series-Parallel
ILED per Channel (A) (max) 0.13
PWM Dimming Freq. (kHz) (max) 2
Dimming Ratio (max) 20000
Dimming Control PWM
POUT (W) 40
LED String Volt. (V) (max) 52
Switching Frequency (kHz) 2200
Package/Pins TQFN-CU/24
Budgetary
Price (See Notes)
3.12

主要特征

  • Wide-Voltage-Range Operation
    • Operates Down to 4V Supply After Startup
    • Survives Load Dump Up to 52V
  • High Integration
    • Complete 6-Channel Solution Including Boost Controller
    • All Settings Performed with External Components, No Need for Microcontroller Intervention
  • Robust and Low EMI
    • Spread-Spectrum Oscillator
    • Phase Shifting
    • 400kHz to 2.2MHz Switching-Frequency Range
  • Versatile Dimming Scheme Allows Hybrid or PWM Dimming
    • Dimming Ratio > 10000:1 Using Hybrid Dimming
    • 10000:1 Dimming Ratio at 200Hz using PWM Dimming
  • Complete Fault Protection
    • LED Open/Short Detection and Protection
    • Boost Output Undervoltage and Overvoltage
    • Thermal Shutdown
  • Compact (4mm x 4mm) 24-Pin TQFN Package

应用/用途

  • 中央信息显示屏
  • 信息娱乐系统显示屏
  • 仪表盘

描述

The MAX20446 is a 6-channel backlight driver with boost controller for automotive displays. The integrated current outputs can sink up to 130mA LED current each. The device accepts a wide 4.5V to 36V input voltage range and withstands direct automotive load-dump events.

The internal current-mode switching DC-DC controller supports boost or SEPIC topologies and operates in the frequency range 400kHz to 2.2MHz. Integrated spread spectrum helps reduce EMI. An adaptive output-voltage control scheme minimizes power dissipation in the LED current-sink paths.

The device features pulse-width modulation (PWM) dimming and hybrid dimming. In either case the minimum pulse width is 500ns. Phase-shifted dimming of the strings is incorporated for lower EMI.

The MAX20446C is exceptionally easy to configure using a single resistor on the SET pin.

The device is available in a 24-pin TQFN package and operates over the -40 to +125°C temperature range.

简化框图

MAX20446C: Simplified Block Diagram MAX20446C: Simplified Block Diagram Zoom icon

Technical Docs

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心

采样:
选择上方“样片”按钮将重定向至第三方ADI样片网站。登录后,所选部件将转移到您在此网站上的购物车。如果您之前从未使用过此网站,请创建一个新帐户。有关此样片网站的任何问题,请联系SampleSupport@analog.com