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MAX20444B

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Automotive 4-Channel 130mA Backlight Driver with Boost/SEPIC Controller and I²C Interface

4-Channel 130mA LED Driver Provides Full Diagnostics and Hybrid Dimming thru I²C

Printable Data Sheet

Product Details

See parametric specs for LED Drivers

Key Features

See parametric specs for LED Drivers

Parametric specs for LED Drivers

V_IN (V) (min)	4.5
V_IN (V) (max)	36
Max. No. of LEDs	15
# LED Channels	4
Regulation Topology	Inductor Based
LED Configuration	Series-Parallel
I_LED per Channel (A) (max)	0.13
PWM Dimming Freq. (kHz) (max)	20
Dimming Ratio (max)	20000
Dimming Control	I2C Serial PWM
P_OUT (W)	32
I_CC (mA) (max)	10
LED String Volt. (V) (max)	52
Switching Frequency (kHz)	500 700 750 1000 1200 1500 2000 2100 2200
Package/Pins	TQFN-CU/24
Budgetary Price (See Notes)	2.65

See parametric specs for LED Drivers

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Simplified Block Diagram

Technical Docs

	Data Sheet	Automotive 4-Channel 130mA Backlight Driver with Boost/SEPIC Controller and I²C Interface	Aug 06, 2021
	solution	LED Driver for Automotive Display Applications

Design & Development

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

Hardware Development

Evaluation Board

MAX20444BEVKIT

$57.24

Description/Applications

The MAX20444B evaluation kit (EV kit) demonstrates the MAX20444B integrated, 4-channel, high-brightness LED driver with boost controller and I²C interface for automotive displays.

The EV kit operates from a DC supply voltage between 4.5V and 36V, and the switching frequency can be set at either 2.2MHz or 400kHz. The EV kit can be configured to operate in stand-alone mode or in I²C mode. Spread-spectrum mode (SSM) for EMI improvement is enabled by default, but it can be disabled trough a register bit. The EV kit demonstrates phase-shifted pulse-width modulation (PWM) dimming, which can be performed either externally using a PWM signal applied to the DIM PCB pad or internally by programming the desired dimming frequency and individual duty cycle using I²C. The hybrid dimming feature can also be enabled through a register bit to reduce EMI. The EV kit also demonstrates fault protection for short LED, open LED, boost output undervoltage and overvoltage, and overtemperature.

For operation at switching frequencies other than 2.2MHz or 400kHz, the external components should be chosen according to the calculations in the MAX20444B IC data sheet.

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.

View Details

Features

Demonstrates Robustness of MAX20444B
Wide 4.5V to 36V Input Operating Range (Up to 52V Load Dump)
Powers HB LEDs (Up to four strings) for Medium-to-Large-Sized LCD Displays in Automotive and Display Backlight Applications
400kHz to 2.2MHz Resistor-Programmable Switching Frequency with Spread-Spectrum Option
Phase-Shift Dimming Option
Demonstrates Cycle-by-Cycle Current Limit and Thermal-Shutdown Features
Demonstrates Wide Dimming Ratio
Demonstrates Failsafe Operation
I²C Programmability
Dedicated GUI
Proven PCB and Thermal Design
Fully Assembled and Tested

Evaluation Board

MAX20444BEVKIT

$57.24

Description/Applications

The MAX20444B evaluation kit (EV kit) demonstrates the MAX20444B integrated, 4-channel, high-brightness LED driver with boost controller and I²C interface for automotive displays.

For operation at switching frequencies other than 2.2MHz or 400kHz, the external components should be chosen according to the calculations in the MAX20444B IC data sheet.

View Details

Features

Demonstrates Robustness of MAX20444B
Wide 4.5V to 36V Input Operating Range (Up to 52V Load Dump)
Powers HB LEDs (Up to four strings) for Medium-to-Large-Sized LCD Displays in Automotive and Display Backlight Applications
400kHz to 2.2MHz Resistor-Programmable Switching Frequency with Spread-Spectrum Option
Phase-Shift Dimming Option
Demonstrates Cycle-by-Cycle Current Limit and Thermal-Shutdown Features
Demonstrates Wide Dimming Ratio
Demonstrates Failsafe Operation
I²C Programmability
Dedicated GUI
Proven PCB and Thermal Design
Fully Assembled and Tested

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 .

Parameters

Parametric specs for LED Drivers

V_IN (V) (min)	4.5
V_IN (V) (max)	36
Max. No. of LEDs	15
# LED Channels	4
Regulation Topology	Inductor Based
LED Configuration	Series-Parallel
I_LED per Channel (A) (max)	0.13
PWM Dimming Freq. (kHz) (max)	20
Dimming Ratio (max)	20000
Dimming Control	I2C Serial PWM
P_OUT (W)	32
I_CC (mA) (max)	10
LED String Volt. (V) (max)	52
Switching Frequency (kHz)	500 700 750 1000 1200 1500 2000 2100 2200
Package/Pins	TQFN-CU/24
Budgetary Price (See Notes)	2.65

See parametric specs for LED Drivers

Key Features

Wide-Voltage-Range Operation
- Operates Down to 4V Supply After Startup
- Survives Load Dump Up to 52V
High Integration
- Complete 4-Channel Solution Including Boost Controller
- I²C Control for Minimum Parts Count
Robust and Low EMI
- Spread-Spectrum Oscillator
- Phase Shifting
- 400kHz to 2.2MHz Switching-Frequency Range
- Fail-Safe Operation Mode Using the FSEN Pin
Versatile Dimming Scheme Allows Hybrid or PWM-Only Dimming Using DIM Input or I²C
- Dimming Ratio > 10000:1 Using Hybrid Dimming
- 10000:1 Dimming Ratio at 200Hz using PWM Dimming
Complete Diagnostics
- LED Open/Short Detection and Protection
- Boost Output Undervoltage and Overvoltage
- Boost Voltage
- Individual String LED Current
- Thermal Shutdown
Compact (4mm x 4mm) 24-Pin TQFN and SWTQFN Packages

Applications/Uses

Central Information Displays
Infotainment Displays
Instrument Clusters

Description

The MAX20444B is a 4-channel backlight driver with boost controller for automotive displays. The integrated current outputs can sink up to 130mA LED current each. The device accepts a wide 4.5V to 36V input voltage range and withstands direct automotive load-dump events.

The internal current-mode switching DC-DC controller supports boost or SEPIC topologies and operates in the frequency range 400kHz to 2.2MHz. Integrated spread spectrum helps reduce EMI. An adaptive output-voltage control scheme minimizes power dissipation in the LED current-sink paths.

The device features I²C-controlled pulse-width modulation (PWM) dimming and hybrid dimming. In either case the minimum pulse width is 500ns. Phase-shifted dimming of the strings is incorporated for lower EMI.

Comprehensive diagnostic information is also available via the I²C interface, while stand-alone operation is also supported.

The MAX20444B is available in a 24-pin TQFN or 24-pin side-wettable TQFN (SWTQFN) package and operates over the -40°C to +125°C temperature range.

Simplified Block Diagram

MAX20444B: Typical Application Circuits

MAX20444B: TTypical Application Circuits

Technical Docs

	Data Sheet	Automotive 4-Channel 130mA Backlight Driver with Boost/SEPIC Controller and I²C Interface	Aug 06, 2021
	solution	LED Driver for Automotive Display Applications

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

MAX20444B

Automotive 4-Channel 130mA Backlight Driver with Boost/SEPIC Controller and I2C Interface

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

MAX20444B Related Videos

Automotive 4-Channel 130mA Backlight Driver with Boost/SEPIC Controller and I²C Interface