MAX25561

RECOMMENDED FOR NEW DESIGNS

6 x 220mA, ASIL B LED Backlight Driver with Boost Controller

Data Sheet (Rev. 1) Product Selection Table

Part Models: 4
1ku List Price: Starting From $2.55

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Part Details

Operates down to 3V on Battery Input while Maintaining 5V Gate Drive
- Wide Boost Duty-Cycle Range
Boost or SEPIC Current-Mode DC-DC Controller
- 400kHz to 2.2MHz Operating Frequency Range
- Optional Spread Spectrum
- Can Be Synchronized to an External Clock
LED Current Sinks
- Up to 220mA Output Current per String
- Low OUT_ Regulation Voltage
- Optional Phase-Shifting Between Channels
16667:1 Dimming Ratio at 200Hz
External or Internal (I²C) Dimming
>16667:1 Dimming Ratio with Hybrid Dimming
Integrated Charge-Pump to Drive Series nMOSFET
Temperature Foldback Using External NTCTemperature Sensor
Fast Startup Option without I²C Intervention UsingEN Pin Only

FLTB Output Provides Diagnostic Information
- Shorted or Open LEDs
- Any OUT_ Pin Shorted to GND
- IREF/RT Resistor Out of Range
- Thermal Warning/Shutdown
- Undervoltage/Overvoltage on Boost Output
- Bandgap out-of-Range/Internal Oscillator Failure
- V18 Internal Supply out-of-Range
- Input Overcurrent (Measured at Boost InputUsing External Sense Resistor)
- Input/Output PWM Comparison
- Continuous Output Current Measurement andCurrent Mismatch (Shutdown/Flag)
I²C Interface with CRC
- Readback of Measured DIM Pin Duty Cycle andFrequency
Compact TQFN Package

Part Models: 4
1ku List Price: Starting From $2.55

Documentation

Data Sheet 1

MAX25561: 6 x 220mA, ASIL B LED Backlight Driver with Boost Controller Data Sheet (Rev.1) 01/09/2024

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
MAX25561ATJ/V+	32-LFCSP-5X5X0.75	Material Declaration Reliablity Data	Ultra Librarian SamacSys
MAX25561ATJ/V+T	32-LFCSP-5X5X0.75	Material Declaration Reliablity Data	Ultra Librarian SamacSys
MAX25561ATJ/VY+	32-LFCSP_SS-5X5X0.75	Material Declaration Reliablity Data	Ultra Librarian SamacSys
MAX25561ATJ/VY+T	32-LFCSP_SS-5X5X0.75	Material Declaration Reliablity Data	Ultra Librarian SamacSys

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

Tools & Simulations

SIMPLIS Models 1

MAX25561 SIMPLIS Schematic

Evaluation Kits

Evaluation Kit for MA25560 and MAX25561

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Features and Benefits

Demonstrates Robustness of MAX25561 and MAX25560
7V (4.5V if LED Current per String Is Set to 150mA orLess) to 36V Input Operating Range (up to 42V LoadDump)
Powers HB LEDs (up to Six Strings) for Medium-to-Large-Sized LCD Displays in Automotive and DisplayBacklight Applications
400kHz to 2.2MHz Resistor-Programmable SwitchingFrequency with Spread-Spectrum Option
Phase-Shift Dimming Option
Demonstrates Cycle-by-Cycle Current-Limit andThermal-Shutdown Features

Demonstrates Wide Dimming Ratio
Demonstrates Hybrid Dimming for Better EMI andAcoustic Performance and Higher Dimming Ratio
Demonstrates Fade in/out for Smooth BrightnessTransition
Designed to Show Thermal Foldback Function
I²C Programmability
Dedicated GUI
Proven PCB and Thermal Design
Fully Assembled and Tested

Product Details

The MAX25561 evaluation kit (EV kit) demonstrates the MAX25561 and MAX25560 integrated 6-channel high-brightness LED driver with boost controller and I²C interface for automotive displays supporting ASIL B (MAX25561 only).

The EV kit operates from a DC supply voltage between 7V (4.5V if the LED current per string is set to 150mA or less) and 36V, and the switching frequency can be either set at 2.2MHz or at 400kHz. The EV kit can only be configured to operate in I²C mode. Spread-spectrum mode (SSM) is enabled by default for EMI improvement, but it can be disabled by acting on a register bit. The EV kit demonstrates phase-shifted, pulse-width modulation (PWM) dimming. Dimming 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 through I²C. When the dimming signal is applied through the DIM PCB pad, readback of measured dimming duty cycle and frequency will be made available on dedicated I²C registers.

The hybrid dimming feature can also be enabled through a register bit to reduce EMI.

The EV kit features a LED current foldback option as a function of the temperature by means of an on-board NTC sensor. I²C-programmable automatic fading functionality is also available.

Finally, the EV kit demonstrates short-LED, open-LED, boost output undervoltage and overvoltage, boost input overcurrent, LED current/duty cycle mismatch, and overtemperature-fault protection. Additional ASIL B features like LED current measurement, boost input current measurement, and boost output voltage measurement are also demonstrated.

For operation at switching frequencies other than 2.2MHz or 400kHz, the external components should be chosen according to the calculations in the MAX25561 IC and MAX25560 IC data sheets.

The EV kit provides an I²C interface that can operate in conjunction with the MAX32625PICO adapter or a third-party I²C controller. Windows^®-based graphical-user interface (GUI) software is available for use with the EV kit and can be downloaded on the MAX25561 and MAX25560 product pages (under the Evaluation Kits tab). A Windows 7 or newer Windows operating system is required to use the EV kit software.

Resources

MAX25561EVKIT Gerber Files
1.11 M

Software

MAX25561EVKIT GUI (Rev.1)
21.08 M

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