MAX25512

Automotive 4-Channel Low-Voltage 120mA LED Backlight Driver with Integrated Boost Converter

Industry Best Efficiency Integrated Boost Converter LED Driver

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Overview

Features and Benefits
Product Details

Features and Benefits

Operates Down to 3V on Battery Input After Startup
- Wide Boost Duty Cycle to Support Low Input Voltage
Boost or SEPIC Current-Mode DC/DC Controller
- 400kHz to 2.2MHz Operating Frequency Range
- Spread Spectrum Available
- Ability to Synchronize to an External Clock
LED Current Sinks
- Up to 120mA Output Current per String
- Low OUT_ Regulation Voltage for Best Efficiency
- Optional Phase-Shifting of Outputs
I²C Control for Enhanced Flexibility
16667:1 Dimming Ratio at 200Hz
NTC Input For LED Current Foldback at High Temperature
Hybrid Dimming Capable
Built-in Programmable Automatic Fading Functionality
Detailed Diagnostic using I²C and FLTB Output
- Shorted or Open LEDs
- Thermal Shutdown
- Output Undervoltage
Compact 4x4mm TQFN Package
AECQ100 Grade 1

Product Details

The MAX25512 is a four-channel white LED backlight driver with an integrated current-mode boost converter which operates over a switching frequency range of 400kHz to 2.2MHz and incorporates spread spectrum. Phase-shifting of the output channels is included as an option to further reduce electromagnetic interference (EMI).

The device provides up to 120mA per channel and includes a control output for an external nMOS series switch. It is capable of operating down to 3V after startup.

The MAX25512 has an I²C interface to enable flexibility of control and detailed diagnostics.

The MAX25512 is available in a compact TQFN package and operates over the temperature range -40°C to +125°C.

Applications

Automotive Instrument Clusters
Automotive Central Information Displays
Automotive Head-Up Displays

Product Categories

Power Management
- Step-Up (Boost) LED Drivers

Markets and Technologies

Automotive (1)
- Cluster Display and Rear Seat Entertainment

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Product Lifecycle Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

MAX25512EVKIT

Evaluation Kit for the MAX25510/MAX25511/MAX25512

MAX25512EVKIT

View Detailed Evaluation Kit Information

The MAX25512 evaluation kit (EV kit) demonstrates the MAX25512 integrated 4-channel high-brightness LED driver with I²C interface for automotive displays, and its stand-alone mode counterparts, namely the MAX25510 and MAX25511. The EV kit operates from a DC supply voltage between 3V and 36V, and the switching frequency can be either set at 2.2MHz or at 400kHz. The EV kit can be configured to operate in stand-alone mode or in I²C mode. Spread-spectrum mode (SSM) is enabled by default for electromagnetic interference (EMI) improvement, but it can be disabled either by acting on a register bit (MAX25512) or by properly choosing the resistor to be connected to the SET pin (MAX25510 and MAX25511).

The EV kit demonstrates phase-shifted pulse-widthmodulation (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 (MAX25512 only). The hybrid dimming feature can be enabled through a register bit to reduce EMI (MAX25512 only). The EV kit features a LED current foldback option either as a function of the temperature, by means of a negative temperature coefficient (NTC) sensor (not provided), or through analog dimming. I²C-programmable (MAX25512) or resistor-programmable (MAX25510 and MAX25511) automatic fading functionality is also available.

Finally, the EV kit demonstrates short-LED, open-LED, LED short to ground, boost output short to ground/undervoltage and overvoltage, and overtemperature-fault protection. For operation at switching frequencies other than 2.2MHz or 400kHz, the external components should be chosen according to the calculations in the IC data sheet.

The EV kit provides an I²C interface that can operate in conjunction with the MINIQUSB+* adapter board or a thirdparty 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 (MAX25512 only).

Note: The MAX25512 EV kit schematic and bill of materials (BOM) show only the MAX25512 (MAX25512ATG/V+) as U2, but there are no other differences if the MAX25512 is replaced by the MAX25510 (MAX25510ATGA/V+) or MAX25511 (MAX25511ATGA/V+).

*Note: To be ordered separately.

Applications

Automotive Central Information Displays
Automotive Head-Up Displays
Automotive Instrument Clusters

Features & Benefits

Demonstrates Robustness the MAX25510, MAX25511, and MAX25512
Wide 3V to 36V Input Operating Range (Up to 40V Load Dump)
Powers High-Brightness (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 Hybrid Dimming for Better EMI and Acoustic Performance and Higher Dimming Ratio
Demonstrates Fade In/Out for Smooth Brightness Transition
Designed to Show Thermal Foldback Function
I²C Programmability (MAX25512 only)
Dedicated GUI
Proven PCB and Thermal Design
Fully Assembled and Tested

Resources

MAX25512EVKIT ODB File - Design Files

TGZ

1.05M

Documentation & Resources

Data Sheets

MAX25512: Automotive 4-Channel Low-Voltage 120mA LED Backlight Driver with Integrated Boost Converter Data Sheet (Rev. 0)
6/9/2021

PDF

877K

Videos

How to design MAX25512 video
11/10/2022
MAX25512 Video Series
7/1/2021

SERIES

Technical Articles

LED Driver for Automotive Display Applications
9/24/2021
Highly Integrated LED Driver Design for Automotive Displays
8/11/2021

Tools & Simulations

Software Development

MAX25512 EV kit Software, 1.0.0

ZIP

Design Resources

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.

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Buy Now Pricing

(**) Displayed Buy Now Price and Price Range is based on small quantity orders.

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(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.