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Analog Devices Inc./Maxim Integrated MAX25561ATJ/VY+T
- Part No.:
- MAX25561ATJ/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Display Drivers
- Package:
- -
- Datasheet:
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MAX25561ATJ/VY+T.pdf
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- MAX25561ATJ/VY+T
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Product details
Overview
MAX25561ATJ/VY+T from Analog Devices is a 6-channel ASIL B–compliant LED backlight driver IC with integrated current-mode boost controller, delivering up to 220mA per channel, operating from 4.5V to 36V input, and supporting 400kHz–2.2MHz switching frequency with spread spectrum for automotive instrument clusters and HUDs.
For engineers reviewing the MAX25561ATJ/VY+T datasheet, MAX25561ATJ/VY+T pinout, MAX25561ATJ/VY+T application, or MAX25561ATJ/VY+T equivalent, key selection considerations include its 6-string independent current sinks, I²C diagnostics for functional safety, phase-shift EMI reduction, low-voltage operation down to 3V with maintained 5V gate drive, and TQFN-32 thermal performance (θJA = 36°C/W).
Technical Context
The MAX25561ATJ/VY+T integrates a current-mode boost controller with selectable 400kHz–2.2MHz switching, spread-spectrum modulation, and programmable phase shift across six output channels to suppress EMI peaks. It supports hybrid dimming with >16667:1 ratio and features dual-stage startup enabling fast EN-only enable without I²C intervention.
Its diagnostic architecture includes continuous ADC monitoring of VBSTMON, VSENSE, temperature, and LED string voltages, with fault reporting via FLTB and register-based readback (e.g., DIAG2_REG, VSENSE). The device implements ASIL B–aligned protections: open/short LED detection, thermal warning/shutdown (125°C/160°C), input overcurrent latching, and V18/V5 supply monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Battery Input Range | 4.5V to 36V; operates down to 3V during startup while sustaining 5V NDRV gate drive |
| LED Output Current | Up to 220mA per channel; ±2.5% matching between strings at 225mA setting |
| Switching Frequency | 400kHz to 2.2MHz; adjustable via RT pin resistor; supports external sync and spread spectrum |
| Dimming Ratio | 16667:1 at 200Hz; >16667:1 with hybrid PWM+analog dimming |
| Operating Temperature | −40°C to +125°C ambient; junction rated to +150°C; qualified for automotive under AEC-Q100 |
| Package Thermal Resistance | θJA = 36°C/W (4-layer board); θJC = 3°C/W enables high-power LED driving with minimal heatsinking |
| I²C Interface | 400kHz clock rate; CRC error checking; register readback of DIM duty cycle, fault flags, and ADC measurements |
Pinout & Package
MAX25561ATJ/VY+T is housed in a 5mm × 5mm, 32-pin TQFN package (Outline 21-0140) with exposed pad for thermal management. Pin count and layout match the MAX25561 family; RoHS-compliant with "+" suffix indicating lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1–OUT6 | LED string cathode sinks | 6 independent constant-current outputs; each supports ≤250mA continuous; max 470pF capacitive load |
| NDRV / NDRVS | High-side nMOSFET gate driver | NDRV delivers 100mA sink/source; NDRVS provides gate voltage sensing for stability and fault detection |
| NGATE | Charge pump output for series nMOSFET | Drives external high-side switch; enables boost operation below 5V input while maintaining 5V gate drive |
| BSTMON / SENSE / CSP / CSN | Boost converter feedback & sensing | BSTMON monitors output voltage for OVP/UVP; SENSE measures input current; CSP/CSN set slope compensation and current limit |
| IREF / ISET / RT / DIM | Current programming & control | IREF sets full-scale current via 22kΩ resistor; ISET enables hardware startup; RT sets fSW; DIM accepts 90Hz–50kHz PWM |
| FLTB / SCL / SDA / EN | Fault signaling & communication | FLTB is open-drain active-low fault flag; I²C interface supports diagnostics; EN enables fast hardware startup |
Key Features
| Feature | Design Value |
|---|---|
| ASIL B–aligned diagnostics | Real-time fault detection including open/short LED, thermal warning/shutdown, BSTMON OVP/UVP, input overcurrent, and bandgap oscillator failure - all reportable via I²C registers |
| Low-voltage operation mode | Automatically switches V5 regulator input from BATT to BOOST when VBATT falls below 5.45V, sustaining 5V gate drive and increasing current limit to 600mV threshold |
| EMI-reduction architecture | Configurable phase shift across 6 channels + spread-spectrum dithering (±4% or ±6%) reduces peak radiated emissions without filter redesign |
| Hybrid dimming capability | Combines analog current scaling (via I²C) and PWM dimming to achieve >16667:1 ratio while minimizing flicker and audible noise |
| Fast-startup option | EN pin alone can power up and begin LED current regulation without I²C initialization - critical for boot-time display readiness in automotive clusters |
Applications
| Automotive Instrument Cluster | Automotive Central Information Display |
|---|---|
Use Scenario: High-brightness, variable-contrast TFT-LCD backlighting in digital dashboards requiring seamless brightness transitions across daylight-to-night conditions. IC Role / Device Role / Timing Role: 6-channel constant-current LED driver with synchronized phase-shifted switching and hybrid dimming to eliminate beat frequencies and ensure uniform luminance. Use Value: Enables 16667:1 dimming ratio and ASIL B–compliant fault logging for ISO 26262 compliance without external microcontroller coordination. | Use Scenario: Backlight for large-format infotainment displays where EMI must remain below CISPR-25 Class 5 limits near RF receivers and ADAS sensors. IC Role / Device Role / Timing Role: Integrated boost controller with spread spectrum and channel phase shifting reduces conducted and radiated emissions at fundamental and harmonic frequencies. Use Value: Eliminates need for additional EMI filters or shielding, reducing BOM cost and PCB area while meeting OEM EMC requirements. |
| Automotive Head-Up Display | Automotive Rear Seat Entertainment |
Use Scenario: Compact, thermally constrained HUD projector module requiring stable LED current despite wide battery voltage swings (6V–16V) and ambient temperatures up to +105°C. IC Role / Device Role / Timing Role: TQFN-32 package with 3°C/W θJC and internal thermal foldback using external NTC on TEMP pin ensures safe operation under sustained high-current loads. Use Value: Maintains consistent luminance and color point across temperature and input voltage variation without external thermal compensation circuitry. | Use Scenario: Dual-zone rear-seat display with independent brightness control for passenger comfort and reduced glare during nighttime travel. IC Role / Device Role / Timing Role: Independent I²C-addressable control of all six channels allows per-string current adjustment and dynamic dimming zone mapping. Use Value: Enables software-defined lighting zones and adaptive dimming profiles without additional driver ICs or MCU GPIO overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX25605ATJ/VY+ | 5-channel, 200mA/channel; no integrated charge pump for NGATE; requires external 5V bias for gate drive below 5V input | Lacks low-voltage operation mode and NGATE charge pump; not suitable for <5V battery start-stop scenarios | Select MAX25561ATJ/VY+T when system must sustain 5V gate drive during cranking (3V–4.5V) |
| TPS61196RHBR | 6-channel, 150mA/channel; no ASIL B diagnostics; no I²C interface; fixed 2.2MHz fSW; no spread spectrum or phase shift | Targeted at non-automotive consumer displays; lacks fault logging, thermal warning, or register readback | Choose MAX25561ATJ/VY+T for functional safety-critical automotive systems requiring ISO 26262 documentation support |
Compared with MAX25605ATJ/VY+ and TPS61196RHBR, the MAX25561ATJ/VY+T uniquely combines 6×220mA drive, ASIL B diagnostics, low-voltage gate drive maintenance, and EMI-suppression features - making it the only option qualified for instrument cluster and HUD applications demanding both performance and safety certification.
Availability
MAX25561ATJ/VY+T is available at Aetrix Electronics and suitable for automotive instrument clusters, central information displays, head-up displays, and rear-seat entertainment systems requiring stable component supply, long-term lifecycle support, and AEC-Q100–qualified performance.
Supply support for MAX25561ATJ/VY+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets with precision power, sensing, and timing solutions.
The MAX25561ATJ/VY+T belongs to Analog Devices' automotive LED driver product line, engineered specifically for ASIL B–compliant backlighting in safety-critical vehicle displays - emphasizing robust diagnostics, thermal resilience, and EMI control in harsh automotive environments.
FAQ
What is the maximum LED string current supported by the MAX25561ATJ/VY+T?
The MAX25561ATJ/VY+T supports up to 220mA per channel, verified across all six OUT pins under full-load conditions at +125°C. At 225mA nominal setting (RIREF = 22kΩ), measured output current is guaranteed between 217mA and 231mA with ±2.5% matching between strings - confirmed in Electrical Characteristics Table on page 6 of the datasheet.
Does the MAX25561ATJ/VY+T support synchronization to an external clock source?
Yes, the MAX25561ATJ/VY+T supports external clock synchronization via AC-coupling of a 50% duty-cycle signal to the RT pin using a 10pF capacitor. Synchronization operates across the full 400kHz–2.2MHz range but disables spread spectrum functionality - a trade-off documented in the Oscillator Frequency section (page 15).
How does the MAX25561ATJ/VY+T handle low-input-voltage conditions during engine cranking?
During cranking, when BATT drops below 5.45V, the MAX25561ATJ/VY+T automatically switches the V5 regulator input from BATT to BOOST, increases the CSP current-limit threshold to 600mV, and reduces switching frequency if above 1.4MHz - ensuring uninterrupted 5V gate drive to NDRV and continued LED regulation down to 3V input, as specified in the Low-Voltage Operation section (page 14).
What fault conditions trigger the FLTB pin on the MAX25561ATJ/VY+T?
The FLTB pin asserts low for eight confirmed fault conditions: open or shorted LEDs on any OUTx, OUTx shorted to GND, IREF/RT resistor out-of-range, thermal warning/shutdown, BSTMON overvoltage/undervoltage, bandgap or internal oscillator failure, V18 supply out-of-range, and input overcurrent detected via SENSE pin - all logged in DIAG2_REG and detailed in the Fault Detection table (page 6).
Can the MAX25561ATJ/VY+T operate without I²C initialization?
Yes, the MAX25561ATJ/VY+T supports fast hardware startup using only the EN pin - enabling immediate LED current regulation after power-on without I²C commands. This mode uses ISET resistor configuration for initial current and is explicitly enabled by the FAST_SS bit, as described in the Detailed Description section (page 14).
MAX25561ATJ/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
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- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Display Type:
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- Configuration:
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MAX25561ATJ/VY+T FAQ
1.How can I place an order for MAX25561ATJ/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25561ATJ/VY+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX25561ATJ/VY+T reliable?
The price and inventory of MAX25561ATJ/VY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX25561ATJ/VY+T is usually 5 days.
3.What payment methods are accepted for MAX25561ATJ/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25561ATJ/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25561ATJ/VY+T?
MAX25561ATJ/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25561ATJ/VY+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX25561ATJ/VY+T?
For technical support, including MAX25561ATJ/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25561ATJ/VY+T requirements.
6.How does Aetrix verify that MAX25561ATJ/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX25561ATJ/VY+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX25561ATJ/VY+T meets industry standards.
7.What is the process for return or replacement of MAX25561ATJ/VY+T?
All MAX25561ATJ/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX25561ATJ/VY+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX25561ATJ/VY+T part is unused and in its original packaging.
Return procedure for MAX25561ATJ/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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