MAX20069

PRODUCTION

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

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Part Models
4
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Part Details

  • 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
  • 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
MAX20069
Automotive I2C-Controlled 4-Channel 150mA Backlight Driver and 4-Output TFT-LCD Bias
MAX20069: Typical Application Circuit
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Documentation

Technical Articles 3

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Tools & Simulations

Software Development 1

Evaluation Kits

MAX20069EVKIT

Evaluation Kit for the MAX20069/MAX20069B/MAX20069C

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Features and Benefits

  • Demonstrates Robustness of MAX20069
  • 2.8V to 5.5V Input Range for TFT Power Section
  • 4.5V to 42V Input Range for LED Driver Section
  • 2.2MHz or 440kHz I2C programmable Boost and Inverted Buck-Boost Switching Frequency with Spread-Spectrum Option on TFT Power Section
  • 2.2MHz or 440kHz I2C programmable Boost Frequency with Spread-Spectrum Option on LED Driver Section with four 150mA LED drivers
  • TFT Section Default Output Voltages (Stand-alone Mode)
  • +6V Output at 150mA (Step-Up Switching Regulator)
  • -6V Output at 100mA (Inverting Buck-Boost Switching Regulator)
  • +16V Output at 3mA (Positive-Charge Pump)
  • -7V Output at 3mA (Negative-Charge Pump)
  • HB LED String Output Currents Configurable for 20mA, 50mA, 100mA, 120mA or 150mA
  • Demonstrates Cycle-by-Cycle Current-Limit and Thermal-Shutdown Features on Boost LED Driver
  • Demonstrates Adaptive Voltage Optimization on LED Driver Section
  • I2C Programmability
  • Dedicated GUI
  • Proven PCB Layout and Thermal Design
  • Fully Assembled and Tested

Product Details

The MAX20069 evaluation kit (EV kit) demonstrates the MAX20069 IC, which is a highly integrated power supply plus LED backlight driver for automotive TFT-LCD applications. The EV kit is a fully assembled and tested surface-mount PCB that provides a complete powermanagement solution for small-size automotive displays. The EV kit demonstrates one buck-boost converter, one boost converter, two gate-voltage controllers, and a boost converter that powers a quad-string LED driver.

The EV kit can be configured to operate in stand-alone mode or in I2C mode.

The TFT bias portion of the EV kit operates from a 2.8V to 5.5V DC supply voltage. The step-up switching regulator (POS) is configured for a 4V to 18V output that provides up to 150mA. The inverting buck-boost converter (NEG) generates a negative output that tracks the positive output (down to a minimum of -7V) and provides up to 100mA. The gate-driver power supplies consist of regulated charge pumps that generate +28V (GVDD) and -21.5V (GVEE) and can deliver up to 3mA each.

The LED driver portion of the EV kit operates from a DC supply voltage of 4.5V up to the HB LED string-forward voltage. The EV kit can withstand a 52V load-dump condition. The EV kit also demonstrates the IC’s features, such as adaptive voltage optimization, Overvoltage and Undervoltage protection, cycle-by-cycle current limit, thermal shutdown, and digital PWM dimming operation using a digital PWM input signal to control the brightness of the HB LEDs.

The EV kit provides an I2C interface that can operate in conjunction with the MINIQUSB+* adapter board or a third party I2C master. The EV kit also includes Windows®- compatible software that provides a simple graphical user interface (GUI) for exercising the features of the IC.

*Note: To be ordered separately.

Applications

  • Automotive Central Information Displays
  • Automotive Dashboards
  • Automotive Head Up Displays
  • Automotive Navigation System
MAX20069EVKIT
Evaluation Kit for the MAX20069/MAX20069B/MAX20069C

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