MAX20069C

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

Industry's First Automotive TFT Bias with 4-Channel LED Driver

Product Details

The MAX20069C 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 +18V 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 (V_POS) is set by connecting an external resistor-divider on FBP or through I²C. The negative source-driver supply voltage (V_NEG) is always tightly regulated to -V_POS (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 from +28V to -21.5V and can deliver up to 3mA each.

The IC features a quad-string LED driver that operates from a separate input voltage (V_BATT) 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 one another. 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 MAX20069C 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.

See parametric specs for LED Drivers

See parametric specs for Multifunction PMICs

Key Features

See parametric specs for LED Drivers

See parametric specs for Multifunction PMICs

See parametric specs for LED Drivers

See parametric specs for Multifunction PMICs

Parametric specs for LED Drivers

V_IN (V) (min)	4.5
V_IN (V) (max)	42
Max. No. of LEDs	56
# LED Channels	4
Regulation Topology	Inductor Based
LED Configuration	Series-Parallel
I_LED per Channel (A) (max)	0.15
PWM Dimming Freq. (kHz) (max)	20
Dimming Ratio (max)	10000
Dimming Control	I2C Serial PWM
P_OUT (W)	40
I_CC (mA) (max)	10
LED String Volt. (V) (max)	52
Switching Frequency (kHz)	400 2200
Package/Pins	TQFN-CU/40
Budgetary Price (See Notes)	0

See parametric specs for LED Drivers

Parametric specs for Multifunction PMICs

V_IN (V) (min)	2.7
V_IN (V) (max)	3.6
# Step-Down Outputs	2
# Step-Up Outputs	2
# Inverting Outputs	1
V_OUT (V) (min)	-24
V_OUT (V) (max)	36
Package/Pins	TQFN-CU/40
Budgetary Price (See Notes)	0

See parametric specs for Multifunction PMICs

View Less

Simplified Block Diagram

Technical Docs

Data Sheet

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

Feb 07, 2022

Design & Development

Click any title below to view the detail page where available.

Hardware Development

Evaluation Board

MAX20069EVKIT

Data Sheet

$59.47

Description/Applications

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.

View Details

Features

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

Evaluation Board

MAX20069EVKIT

Data Sheet

$59.47

Description/Applications

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

*Note: To be ordered separately.

View Details

Features

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

Support & Training

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Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

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Parameters

Parametric specs for LED Drivers

V_IN (V) (min)	4.5
V_IN (V) (max)	42
Max. No. of LEDs	56
# LED Channels	4
Regulation Topology	Inductor Based
LED Configuration	Series-Parallel
I_LED per Channel (A) (max)	0.15
PWM Dimming Freq. (kHz) (max)	20
Dimming Ratio (max)	10000
Dimming Control	I2C Serial PWM
P_OUT (W)	40
I_CC (mA) (max)	10
LED String Volt. (V) (max)	52
Switching Frequency (kHz)	400 2200
Package/Pins	TQFN-CU/40
Budgetary Price (See Notes)	0

See parametric specs for LED Drivers

Parametric specs for Multifunction PMICs

V_IN (V) (min)	2.7
V_IN (V) (max)	3.6
# Step-Down Outputs	2
# Step-Up Outputs	2
# Inverting Outputs	1
V_OUT (V) (min)	-24
V_OUT (V) (max)	36
Package/Pins	TQFN-CU/40
Budgetary Price (See Notes)	0

See parametric specs for Multifunction PMICs

Key Features

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

Applications/Uses

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

Description

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

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 MAX20069C 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.

Simplified Block Diagram

Technical Docs

Data Sheet

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

Feb 07, 2022

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

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INTERACTIVE Data Sheet

MAX20069C

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

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

Technical Docs

Design & Development

Support & Training

Parameters

Key Features

Applications/Uses

Description

Simplified Block Diagram

Technical Docs

Support & Training

MAX20069C Related Videos

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