MAX20056B

PRODUCTION

Integrated, 6-Channel High-Brightness LED Driver with Very Wide PWM Dimming Ratio and Phase Shifting for Automotive Displays

Multistring Driver Provides Highest Efficiency and Lowest External Component Count with Noise-Mitigating Features

Data Sheet (Rev. 0) Product Selection Table

Part Models: 4
1ku List Price: Starting From $1.20

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Overview

Robust with Respect to EMC and Automotive Battery Transients
- Wide 4.5V to 42V Input Operating Range Powers HB LEDs for Medium-to-Large-Sized LCD Displays in Automotive and Display Backlight Applications
- Withstands Automotive Load-Dump Events Up to 52V
- Integrated Spread Spectrum
Spread-Spectrum Mode Reduces Emission at the Switching Frequency and its Harmonics
- EMI Reduction Features Include Spread-Spectrum Modulation (±6% of the Switching Frequency Set by a Resistor Connected Between RT and SGND)
Phase-Shift Dimming of LED Strings
- Reduced Input and Output Ripple/Audible Noise
Wide Contrast Ratio Ideal for High-Quality TFT and Head-Up Displays
- PWM Dimming Ratio of 10,000:1 at 200Hz
Robust with Respect to Temperature and Fault Conditions
- LED-Open/Short Detection
- Overtemperature Protection
- Low Shutdown Current (< 15μA) through Enable Pin
- Thermally Enhanced 24-Pin TSSOP Package
- -40°C to +125°C AEC-Q100 compliance

The MAX20056B is a 6-channel LED driver that integrates a DC-DC switching boost/SEPIC controller and six 120mA current sinks. A current-mode switching DC-DC controller provides the necessary voltage to the strings of HB LEDs.

An internal current-mode switching DC-DC controller supports boost, SEPIC, or coupled-inductor buck-boost topologies and operates in a programmable frequency range between 400kHz and 2.2MHz. Current-mode control provides fast response and simplifies loop compensation. An adaptive output-voltage-adjustment scheme minimizes power dissipation in the LED current sinks.

An external resistor sets the channel currents to the same value in the range of 20mA to 120mA. The device features logic-controlled pulse-width modulation (PWM) dimming with minimum pulse widths as low as 500ns, and either phase-shifted LED strings or standard dimming control. 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, each current sink is turned on at the same time and allows parallel connection of current sinks for > 120mA per string.

Applications

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

Part Models: 4
1ku List Price: Starting From $1.20

Documentation

Data Sheet 1

MAX20056B: Integrated, 6-Channel High-Brightness LED Driver with Very Wide PWM Dimming Ratio and Phase Shifting for Automotive Displays Data Sheet (Rev.0) 11/05/2019

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
MAX20056BAUGA/V+	TSSOP_4.4 / TSSOP_6.1	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
MAX20056BAUGA/V+T	TSSOP_4.4 / TSSOP_6.1	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
MAX20056BAUGB/V+	TSSOP_4.4 / TSSOP_6.1	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
MAX20056BAUGB/V+T	TSSOP_4.4 / TSSOP_6.1	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

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

Software Resources

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Tools & Simulations

SIMPLIS Models 1

MAX20056B SIMPLIS Schematic

Evaluation Kits

Evaluation Kit for the MAX20056B

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Features and Benefits

Input Voltage: 4.5V to 36V (Up to 50V Load Dump)
Drives Six Strings of HB LEDs
LED Current: 20mA to 120mA
Demonstrates Both Phase-Shifted and Direct PWM Dimming
Demonstrates Undervoltage Lockout and Output Short Protection
Demonstrates Cycle-by-Cycle Current Limit and Thermal-Shutdown Feature
Demonstrates 5V, 30mA LDO Output Capability
Proven PCB and Thermal Design
Fully Assembled and Tested

Product Details

The MAX20056B evaluation kit (EV kit) demonstrates the MAX20056B, an integrated, 6-channel high-brightness LED driver with very wide PWM dimming ratio and phase shifting for automotive displays.

The EV kit operates from a DC supply voltage from 4.5V to 36V and the switching frequency is set at 400kHz. Spread-spectrum mode (SSM) is enabled for EMI improvement. The EV kit demonstrates direct dim and phase-shifted pulse-width modulation (PWM) dimming. The EV kit also demonstrates short-LED, open- LED, and overtemperature-fault protection.

For operation at switching frequencies other than 400kHz, the external components should be chosen according to the calculations in the MAX20056B IC data sheet.