回到顶部

Automotive 6-Channel Backlight Driver with Boost/SEPIC Controller and I2C Interface

6-Channel 130mA LED Driver Provides Full Diagnostics and Hybrid Dimming thru I2C

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 Digital
I2C Serial
POUT (W) 40
ICC (mA) (max) 10
LED String Volt. (V) (max) 52
Switching Frequency (kHz) 2200
Package/Pins TQFN-CU/24
Budgetary
Price (See Notes)
2.65
缩小

简化框图

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

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 Digital
I2C Serial
POUT (W) 40
ICC (mA) (max) 10
LED String Volt. (V) (max) 52
Switching Frequency (kHz) 2200
Package/Pins TQFN-CU/24
Budgetary
Price (See Notes)
2.65

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
    • I2C Control for Minimum Parts Count
  • Robust and Low EMI
    • Spread-Spectrum Oscillator
    • Phase Shifting
    • 400kHz to 2.2MHz Switching-Frequency Range
    • Fail-Safe Operation Mode Using the FSEN Pin
  • Versatile Dimming Scheme Allows Hybrid or PWM-Only Dimming Using DIM Input or I2C
    • Dimming Ratio > 10000:1 Using Hybrid Dimming
    • 10000:1 Dimming Ratio at 200Hz using PWM Dimming
  • Complete Diagnostics
    • LED Open/Short Detection and Protection
    • Boost Output Undervoltage and Overvoltage
    • Boost Voltage
    • Individual String LED Current
    • 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 I2C-controlled 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.

Comprehensive diagnostic information is also available through the I2C interface.

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

Design Solution: Overcome the Design Challenges of New Automotive Display Backlights ›

简化框图

MAX20446B: Typical Application Circuit MAX20446B: Typical Application Circuit 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