回到顶部

Automotive I2C-Controlled 4-Channel 150mA Backlight Driver and 4-Output TFT-LCD Bias

Industry's First Automotive TFT Bias with 4 CH LED Driver

产品详情

主要特征

Parametric specs for LED Drivers
VIN (V) (min) 4.75
VIN (V) (max) 42
Max. No. of LEDs 50
# LED Channels 4
Regulation Topology Boost
SEPIC
LED Configuration Series-Parallel
ILED per Channel (A) (max) 0.15
PWM Dimming Freq. (kHz) (max) 20
Dimming Ratio (max) 20000
Dimming Control Digital
I2C Serial
PWM
ICC (mA) (max) 10
LED String Volt. (V) (max) 52
Switching Frequency (kHz) 400
2200
Package/Pins TQFN/40
Budgetary
Price (See Notes)
4.61
Parametric specs for Multifunction PMICs
VIN (V) (min) 2.7
VIN (V) (max) 3.6
# Step-Down Outputs 2
# Step-Up Outputs 2
# Inverting Outputs 1
VOUT (V) (min) -24
VOUT (V) (max) 36
Package/Pins TQFN/40
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) 4.75
VIN (V) (max) 42
Max. No. of LEDs 50
# LED Channels 4
Regulation Topology Boost
SEPIC
LED Configuration Series-Parallel
ILED per Channel (A) (max) 0.15
PWM Dimming Freq. (kHz) (max) 20
Dimming Ratio (max) 20000
Dimming Control Digital
I2C Serial
PWM
ICC (mA) (max) 10
LED String Volt. (V) (max) 52
Switching Frequency (kHz) 400
2200
Package/Pins TQFN/40
Budgetary
Price (See Notes)
4.61
Parametric specs for Multifunction PMICs
VIN (V) (min) 2.7
VIN (V) (max) 3.6
# Step-Down Outputs 2
# Step-Up Outputs 2
# Inverting Outputs 1
VOUT (V) (min) -24
VOUT (V) (max) 36
Package/Pins TQFN/40

主要特征

  • 4-Output TFT-LCD Bias Power
    • 2.8V to 5.5V Input for the TFT-LCD Section
    • Integrated 440kHz or 2.2MHz Boost and Buck-Boost Converters
    • Positive and Negative 3mA Gate Voltage Regulators with Adjustable Output Voltage
    • Flexible Resistor-Programmable Sequencing through the SEQ Pin
    • Undervoltage Detection on All Outputs
    • Low-Quiescent-Current Standby Mode
  • 4-Channel LED Backlight Driver
    • Up to 150mA Current per Channel
    • 4.5V to 42V Input Voltage Range
    • Integrated Boost/SEPIC Controller (440kHz or 2.2MHz)
    • Dimming Ratio 10,000:1 at 200Hz
    • Adaptive Voltage Optimization to Reduce Power Dissipation in the LED Current Sinks
    • Open-String, Shorted-LED, and Short-to-GND Diagnostics
  • Low EMI
    • Phase-Shift Dimming of LED Strings
    • Spread Spectrum on LED Driver and TFT
    • Selectable Switching Frequency with Fine-Tuning via I2C
  • I2C Interface for Control and Diagnostics
    • Fault Indication through the FLTB pin and I2C
  • Overload and Thermal Protection
  • -40°C to +105°C Ambient Temperature Operation
  • 40-Pin (6mm x 6mm) TQFN Package with Exposed Pad

应用/用途

  • • Automotive Central Information Displays
  • • Automotive Dashboards
  • • Automotive Head Up Displays
  • • Automotive Navigation System

描述

The MAX20069B is a highly integrated TFT power supply and LED backlight driver IC for automotive TFT-LCD applications. The IC integrates one buck-boost converter, one boost converter, two gate-driver supplies, and a boost/SEPIC converter that can power one to four strings of LEDs in the display backlight.

The source-driver power supplies consist of a synchronous boost converter and an inverting buck-boost converter that can generate voltages up to +15V and down to -7V. The positive source driver can deliver up to 120mA, while the negative source driver is capable of 100mA. The positive source-driver supply regulation voltage (VPOS) is set by connecting an external resistor-divider on FBP or through I2C. The negative source-driver supply voltage (VNEG) is always tightly regulated to -VPOS (down to a minimum of -7V). The source-driver supplies operate from an input voltage between 2.8V and 5.5V.

The gate-driver power supplies consist of regulated charge pumps that generate up to +28V and -21.5V and can deliver up to 3mA each.

The IC features a quad-string LED driver that operates from a separate input voltage (VBATT) and can power up to four strings of LEDs with 150mA (max) of current per string. The IC features logic-controlled pulse-width-modulation (PWM) dimming, with minimum pulse widths as low as 500ns with the option of phase shifting the LED strings with respect to each other. When phase shifting is enabled, each string is turned on at a different time, reducing the input and output ripple as well as audible noise. With phase shifting disabled, the current sinks turn on simultaneously and parallel connection of current sinks is possible.

The startup and shutdown sequences for all power domains are controlled using one of the seven preset modes, which are selectable through a resistor on the SEQ pin or through the I2C interface.

The MAX20069B is available in a 40-pin (6mm x 6mm) TQFN package with an exposed pad, and operates over the -40°C to +105°C ambient temperature range.

简化框图

MAX20069B: Simplified Block Diagram MAX20069B: 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