MAX20070B

PRODUCTION

Integrated TFT Power Supply and LED Backlight Drivers

Integrated TFT Power Supplies and LED Backlight Driver Reduce System Component Count

Part Models
2
1ku List Price
Starting From $6.09
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Part Details

  • Integrates Both TFT Power Supplies and LED Backlight Driver in One IC, Reducing Component Count
  • Alleviates EMI Due to Spread Spectrum on Both Source Driver Supplies and LED Driver
  • 10000:1 Dimming Ratio at 200Hz Dimming Frequency
  • Available in a 32-Pin (5mm × 5mm) TQFN with an Exposed Pad for Heat Dissipation and Operates Over the -40°C to +105°C Ambient Temperature Range
MAX20070B
Integrated TFT Power Supply and LED Backlight Drivers
MAX20070, MAX20070B:Simplified Operating Circuit
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Hardware Ecosystem

Parts Product Life Cycle Description
LCD/CCD/OLED Bias 1
MAX8614 PRODUCTION Dual-Output (+ and -) DC-DC Converters for CCD
Product 1
MAX16927 Automotive TFT-LCD Power Supply with Boost, Buck, and Cuk Converters, VCOM Buffers, Gate Drivers, and SPI Interface
Step-Up (Boost) LED Drivers 1
MAX16838 PRODUCTION Integrated, 2-Channel, High-Brightness LED Driver with High-Voltage Boost and SEPIC Controller
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Evaluation Kits

MAX20070EVKIT

Evaluation Kit for the MAX20070/MAX20070B

Features and Benefits

  • 2.7V to 5.5V Input Range for TFT Power Section
  • 4.5V to 16V Input Range for LED Driver Section
  • 1MHz Boost and Inverted Buck-Boost Switching Frequency on TFT Power Section
  • TFT Section Output Voltages
    • +6.5V Output at 100mA (Step-Up Switching Regulator)
    • -6.5V 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 80mA or 160mA
  • Demonstrates Cycle-by-Cycle Current-Limit and Thermal-Shutdown Features on Boost LED Driver
  • Demonstrates Adaptive Voltage Optimization on LED Driver Section
  • Proven PCB Layout and Thermal Design
  • Fully Assembled and Tested

Product Details

The MAX20070 evaluation kit (EV kit) demonstrates the MAX20070 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 power-management 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 dual-string LED driver.

The DC-DC converter portion of the EV kit operates from a 2.7V to 5.5V DC supply voltage. The step-up switching regulator (POS) is configured for a 6.5V or 15V output that provides 100mA. The inverting buck-boost converter (NEG) generates a negative output that tracks the positive output and provides 100mA. The gate-driver power supplies consist of regulated charge pumps that generate +16V (GVDD) and -7V (GVEE) and can deliver up to 3mA each. It is also possible to completely turn off the inverting buck-boost regulator by changing the value of the R15 resistor to 140kΩ.

The LED driver section demonstrates a step-up DC-DC preregulator followed by two channels of linear current sinks. The step-up preregulator switches at 1MHz and operates as a current-mode-controlled regulator capable of providing up to 300mA for the linear circuits. Each channel is capable of operating up to 38V and provides up to 160mA. The channels are configurable for 80mA or 160mA HB LED output current.

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 40V load-dump condition. The EV kit also demonstrates the IC’s features, such as adaptive voltage optimization, overvoltage protection (OVP), 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 is shipped with the MAX20070, but can also be used to evaluate the MAX20070B with IC replacement of U1.

Applications

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

MAX20070EVKIT
Evaluation Kit for the MAX20070/MAX20070B

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