MAX20070B

PRODUCTION

Integrated TFT Power Supply and LED Backlight Drivers

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

Data Sheet (Rev. 7) Product Selection Table

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

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Overview

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

The MAX20070/MAX20070B are highly integrated power supplies and LED backlight drivers for automotive TFT-LCD applications. The devices integrate one buck-boost converter, one boost converter, two gate-driver supplies, and a boost/SEPIC converter that can power one to two strings of LEDs in the display backlight.

The source-driver power supplies consist of a boost converter and an inverting buck-boost converter that can generate voltages up to +15V and -15V. Both source-driver power supplies can deliver up to 100mA. The positive source-driver supply regulation voltage (V_POS) is set by connecting an external resistor-divider on FBP. Connecting the FBP pin to ground sets the regulation voltage (V_POS) to +6.5V. The negative source-driver supply voltage (V_NEG) is always tightly regulated to -V_POS within ±50mV. The source-driver supplies use an input voltage from 2.7V to 5.5V to generate the output voltages.

The gate-driver power supplies consist of regulated charge pumps that generate up to +22V and -22V and can deliver up to 3mA each. The regulation voltage (V_GVDD) on the positive charge pump is set by a resistor-divider on FBPG; the regulation voltage (V_GVEE) on the negative charge pump is set by a resistor-divider on FBNG.

The ICs feature a dual-string LED driver that operates off a separate input voltage (V_BATT) and can power up to two strings of LEDs with 160mA (max) of current per string.

The startup and shutdown sequences for all power domains is controlled using one of the seven preset modes that are selectable through a resistor on SEQ.

The MAX20070/MAX20070B are available in a 32-pin, 5mm × 5mm TQFN package with an exposed pad, and operates over the -40°C to +105°C ambient temperature range.

Applications

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

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

Documentation

Data Sheet 1

MAX20070-MAX20070B: Integrated TFT Power Supply and LED Backlight Drivers Data Sheet (Rev.7) 08/22/2019

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX20070BGTJA/V+	32-LFCSP-5X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX20070BGTJA/V+T	32-LFCSP-5X5X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 18, 2021 - 2161 ASSEMBLY
		pcn_2161
MAX20070BGTJA/V+	PRODUCTION
MAX20070BGTJA/V+T	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

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

Evaluation Kits

Evaluation Kit for the MAX20070/MAX20070B

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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.