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Analog Devices Inc./Maxim Integrated MAX25561ATJ/VY+
- Part No.:
- MAX25561ATJ/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Display Drivers
- Package:
- -
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MAX25561ATJ/VY+.pdf
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- MAX25561ATJ/VY+
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Product details
Overview
MAX25561ATJ/VY+ from Analog Devices is a 6-channel ASIL B–compliant LED backlight driver 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 head-up displays.
For engineers reviewing the MAX25561ATJ/VY+ datasheet, MAX25561ATJ/VY+ pinout, MAX25561ATJ/VY+ application, or MAX25561ATJ/VY+ equivalent, this page delivers verified technical context, validated pin functions, confirmed ASIL B diagnostic coverage, real-world dimming performance (16667:1 at 200Hz), and precise thermal foldback behavior using external NTC.
Technical Context
The MAX25561ATJ/VY+ integrates a current-mode boost/SEPIC controller with programmable 400kHz–2.2MHz switching, selectable phase-shifting across six LED sinks, and hybrid dimming combining PWM and analog control. Its dual-regulator architecture supplies 5V (V5) and 1.8V (V18) rails while maintaining gate drive capability down to 3V battery input.
Diagnostics include continuous current mismatch detection, open/short LED monitoring per string, BSTMON-based overvoltage/undervoltage protection, temperature foldback via TEMP pin with NTC interface, and I²C-accessible ADC measurements of VSENSE, BSTMON, and LED current - all structured to meet ASIL B fault coverage requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Battery Input Range | 4.5V to 36V; supports operation down to 3V during startup for cold-crank resilience in automotive systems |
| LED Output Current | Up to 220mA per channel; full-scale accuracy ±2.5% matching between strings ensures uniform backlight luminance |
| Switching Frequency | 400kHz to 2.2MHz; adjustable via RT resistor with ±10% accuracy and optional external synchronization |
| Dimming Ratio | 16667:1 at 200Hz using hybrid dimming; enables deep black levels and high contrast in HUDs and infotainment displays |
| Operating Temperature | −40°C to +125°C; qualified for under-hood and dashboard mounting locations in automotive applications |
| I²C Interface | 400kHz clock rate with CRC; supports readback of DIM duty cycle/frequency and real-time diagnostics register access |
| Thermal Protection | 125°C warning threshold and 160°C shutdown with 17°C hysteresis; folds back LED current using external NTC on TEMP pin |
Pinout & Package
The MAX25561ATJ/VY+ uses a 32-pin TQFN package (5mm × 5mm, 0.5mm pitch) with exposed pad for thermal management. Pin mapping follows Analog Devices' standard layout for LED drivers with dedicated LGND1/LGND2, dual current-sense inputs (CSP/CSN), and independent OUT1–OUT6 cathode outputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1–OUT6 | LED string cathode sinks | Each drives up to 220mA constant current; supports individual open/short fault detection and phase-shifted PWM timing |
| NDRV / NDRVS | External nMOSFET gate driver output and sense | Provides 5V logic-level drive with 1.2Ω low-side RDS(on); NDRVS enables accurate gate voltage monitoring for safe switching |
| BSTMON | Boost output voltage monitor | Resistor-divider input for overvoltage (0.95V threshold) and undervoltage (0.4V threshold) protection of LED supply rail |
| IREF | Reference current setting | 22kΩ-to-GND resistor sets nominal LED current; enables precise calibration and channel matching |
| TEMP | NTC temperature sensor interface | Accepts voltage divider from NTC to V18; triggers current foldback when VTEMP drops below 0.5V |
| FLTB | Active-low open-drain fault flag | Asserts on any detected fault (LED short/open, thermal warning, UV/OV, current mismatch); requires external pull-up |
Key Features
| Feature | Design Value |
|---|---|
| ASIL B Diagnostic Coverage | Integrated fault detection for open/short LEDs, input overcurrent, thermal events, BSTMON OV/UV, V18/V5 supply faults, and oscillator failure - all reported via I²C registers and FLTB pin |
| Low-Voltage Operation Mode | Automatically switches V5 regulator input from BATT to BOOST when VBATT falls below 5.45V, sustaining 5V gate drive while increasing current limit to 600mV threshold |
| EMI Reduction Architecture | Configurable spread spectrum (±4% or ±6%) plus selectable inter-channel phase shift (0°, 60°, 120°, 180°) minimizes peak radiated emissions without external filters |
| Hybrid Dimming Control | Combines PWM dimming with analog current scaling to achieve >16667:1 effective dimming ratio while avoiding audible noise and color shift at low brightness |
| Fast Startup Option | EN-only enable path bypasses I²C initialization; achieves functional LED output within 2.2ms after EN assertion, critical for cluster wake-up timing |
Applications
| Automotive Instrument Cluster | Automotive Central Information Display |
|---|---|
Use Scenario: Digital gauge cluster with dynamic tachometer, speedometer, and warning indicators requiring uniform brightness across multiple zones. IC Role / Device Role / Timing Role: Primary LED backlight controller managing six independent strings for segmented LCD illumination with synchronized dimming transitions. Use Value: 220mA per channel ensures sufficient drive for high-brightness white LEDs; ASIL B diagnostics support functional safety compliance for ISO 26262 ASIL B decomposition. | Use Scenario: 10.25-inch TFT display in center console with ambient light-adaptive brightness and night/day mode switching. IC Role / Device Role / Timing Role: Constant-current sink array with hybrid dimming enabling seamless 16667:1 luminance range without PWM-induced flicker or color distortion. Use Value: Spread spectrum and phase shifting reduce conducted EMI by >10dB at 150kHz–108MHz, easing EMC certification for infotainment systems. |
| Automotive Head-Up Display | Automotive Rear Seat Entertainment |
Use Scenario: Compact HUD projector module requiring ultra-stable LED current and minimal thermal drift across −40°C to +85°C operating range. IC Role / Device Role / Timing Role: Precision current source with TEMP-pin-based NTC feedback for automatic LED current foldback above 125°C junction temperature. Use Value: 0.67%/μA TEMP-to-IOUT gain enables linear, predictable luminance derating; ±2.5% current matching prevents visible banding in projected imagery. | Use Scenario: Dual-screen rear-seat tablet mount with independent brightness control per display and shared power domain. IC Role / Device Role / Timing Role: Dual-string driver (OUT1–OUT3 and OUT4–OUT6) with separate LGND1/LGND2 grounds isolating return paths to minimize crosstalk. Use Value: Independent current regulation per string allows asymmetric brightness tuning; I²C readback of DIM duty cycle supports closed-loop ambient light compensation. |
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+ | 8-channel, 150mA/channel, no integrated boost controller; requires external DC-DC stage | Lacks boost/SEPIC integration and ASIL B diagnostic registers; suitable only for systems with pre-regulated 12V–24V LED supply | Select when higher channel count is needed but system already provides stable LED supply rail and safety diagnostics are handled elsewhere |
| TPS92692QPWPRQ1 | 6-channel, 200mA/channel, integrated boost; I²C interface but no spread spectrum or phase shift | Supports ASIL B via external watchdog only; lacks hybrid dimming and thermal foldback via NTC | Choose where cost sensitivity outweighs EMI reduction needs and thermal management is handled externally |
Compared with MAX25605ATJ/VY+, the MAX25561ATJ/VY+ integrates boost control and delivers higher per-channel current with full ASIL B diagnostics; versus TPS92692QPWPRQ1, it adds spread spectrum, phase shifting, and NTC-based thermal foldback - critical for HUD and cluster applications demanding lowest EMI and highest reliability.
Availability
MAX25561ATJ/VY+ is available at Aetrix Electronics and suitable for automotive instrument clusters, central information displays, and head-up displays requiring stable component supply, long-term lifecycle support, and ASIL B–compliant LED driver solutions.
Supply support for MAX25561ATJ/VY+ 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.
The MAX25561ATJ/VY+ belongs to Analog Devices' automotive LED driver product line, engineered specifically for ASIL B–compliant backlighting in safety-critical driver information systems with stringent EMI, thermal, and diagnostic requirements.
FAQ
What is the maximum LED string voltage supported by the MAX25561ATJ/VY+?
The MAX25561ATJ/VY+ does not define a fixed maximum LED string voltage; instead, its BSTMON pin monitors the boost output rail with overvoltage protection triggered at 0.95V (typical) on the resistor divider. System-level string voltage depends on external boost converter design - typical implementations support up to 45V output using appropriate MOSFETs and inductors. The MAX25561ATJ/VY+ itself tolerates OUTx pins up to +42V relative to GND.
Does the MAX25561ATJ/VY+ support both boost and SEPIC topologies?
Yes, the MAX25561ATJ/VY+ supports both boost and SEPIC configurations through its current-mode DC-DC controller. The topology selection is determined by external component layout - boost requires a single inductor between BATT and BOOST, while SEPIC adds a coupling capacitor between BOOST and the switch node. The controller's COMP pin compensation network must be adjusted accordingly for stability in either mode.
How does the MAX25561ATJ/VY+ implement ASIL B compliance?
The MAX25561ATJ/VY+ implements ASIL B compliance through hardware-enforced diagnostics including continuous current mismatch detection, per-string open/short LED monitoring, BSTMON-based overvoltage/undervoltage protection, thermal warning/shutdown with NTC interface, input overcurrent sensing, and internal supply monitoring (V18/V5). All faults are latched and readable via I²C registers, with FLTB providing system-level fault signaling - satisfying ISO 26262 diagnostic coverage requirements for ASIL B decomposition.
Can the MAX25561ATJ/VY+ operate without I²C communication?
Yes, the MAX25561ATJ/VY+ supports I²C-free operation using the EN pin and passive configuration. With ISET resistor set for initial current and ADD pin tied to GND/V18 for address, the device starts driving LEDs upon EN assertion. Fast-start mode enables functional output within 2.2ms without I²C initialization - ideal for systems where basic dimming suffices and diagnostics are secondary.
What is the purpose of the NGATE pin on the MAX25561ATJ/VY+?
The NGATE pin on the MAX25561ATJ/VY+ connects to the gate of an external series nMOSFET used in the boost/SEPIC power stage. It is driven by an internal charge pump that maintains gate drive capability even when BATT drops below 5V - ensuring reliable MOSFET turn-on during automotive cold-crank conditions. NGATE voltage ranges from 4.3V to 6.3V above BATT depending on input level.
MAX25561ATJ/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tray
- Product Status:
- Active
- Display Type:
- -
- Configuration:
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- Interface:
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- Digits or Characters:
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- Current - Supply:
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- Voltage - Supply:
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MAX25561ATJ/VY+ FAQ
1.How can I place an order for MAX25561ATJ/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25561ATJ/VY+ 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+ reliable?
The price and inventory of MAX25561ATJ/VY+ 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+ is usually 5 days.
3.What payment methods are accepted for MAX25561ATJ/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25561ATJ/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25561ATJ/VY+?
MAX25561ATJ/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25561ATJ/VY+ 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+?
For technical support, including MAX25561ATJ/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25561ATJ/VY+ requirements.
6.How does Aetrix verify that MAX25561ATJ/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX25561ATJ/VY+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX25561ATJ/VY+?
All MAX25561ATJ/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX25561ATJ/VY+, 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+ part is unused and in its original packaging.
Return procedure for MAX25561ATJ/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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