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Analog Devices Inc./Maxim Integrated MAX25512ATG/V+T
- Part No.:
- MAX25512ATG/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
MAX25512ATG/V+T.pdf
- Description:
- 4CH, 120MA, HIGHLY INTEGRATED LE
- Quantity:
- Payment:
- Shipping:
Inventory:2,491
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Product details
Overview
The MAX25512ATG/V+T from Analog Devices is an AEC-Q100 Grade 1, I²C-controlled 4-channel white LED backlight driver with integrated current-mode boost converter. It delivers up to 120mA per channel, operates from 3V post-startup to 36V input, and supports 400kHz–2.2MHz switching with spread spectrum and optional phase-shifting for EMI reduction in automotive displays.
For engineers reviewing the MAX25512ATG/V+T datasheet, MAX25512ATG/V+T pinout, MAX25512ATG/V+T application, or MAX25512ATG/V+T equivalent, this device is selected for high-reliability automotive backlighting where precise dimming control (16667:1 ratio), thermal foldback, hybrid dimming, and fault diagnostics via I²C/FLTB are required.
Technical Context
The MAX25512ATG/V+T integrates a current-mode DC-DC controller supporting both boost and SEPIC topologies, with programmable switching frequency (via RT pin or external sync) and wide duty-cycle capability (up to 98%) to sustain regulation down to 3V input after startup. Its internal nMOS DRAIN switch (RDS(ON) = 0.075Ω typ.) and NGATE driver enable efficient high-side series MOSFET control.
Four independent LED current sinks feature matched output (±2.2% at 120mA), low OUT_ regulation voltage (0.55–0.875V), and support for analog, PWM, and hybrid dimming modes. Diagnostics include open/short LED detection, thermal warning (125°C) and shutdown (160°C), overvoltage/undervoltage protection, and NTC-based temperature foldback via TEMP pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Output Channels | 4 independent current sinks, each configurable up to 120mA for parallel LED strings |
| Input Voltage Range | 4.5V–36V operating; sustains operation down to 3V after startup for cold-crank resilience |
| Switching Frequency | 400kHz–2.2MHz, adjustable via RT resistor or external clock sync for EMI optimization |
| Dimming Ratio | 16667:1 at 200Hz using hybrid dimming-enables smooth, flicker-free brightness control |
| Thermal Protection | Thermal warning at 125°C and shutdown at 160°C with 17°C hysteresis for safe derating |
| Diagnostic Interface | I²C register access + FLTB open-drain fault flag pin reporting open/short LED, thermal, UV/OV faults |
| AEC-Q100 Grade | Grade 1 (–40°C to +125°C ambient), qualified for automotive instrument clusters and HUDs |
Pinout & Package
MAX25512ATG/V+T is housed in a 4mm × 4mm, 24-pin TQFN package (package code T2444+4C) with exposed thermal pad for enhanced power dissipation. The pinout supports compact automotive PCB layout with dedicated IN, DRAIN, NGATE, BSTMON, and four OUT_ outputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | DRAIN | Drain of internal nMOS power switch; connects to boost inductor and rectifier diode anode |
| 3 | IN | Main input supply (4.5–36V); requires local 2.2µF + 0.1µF bypass for stability |
| 4 | NGATE | Gate drive output for external high-side nMOS series switch; charge-pump boosted |
| 5 | BSTMON | Boost output voltage monitor input; sets OV threshold via resistor divider |
| 6 | RT | Oscillator timing node-sets fSW with resistor to GND or accepts AC-coupled sync clock |
| 7 | COMP | Current-mode compensation node; connects to GND via RC network for loop stability |
| 8 | RSDT | Adjustable LED short-detection threshold; sets sensitivity via V18-referenced divider |
| 9–12 | OUT1–OUT4 | Four independent LED current sink outputs; each sinks up to 120mA with matched accuracy |
| 13–14 | SDA, SCL | I²C bidirectional data and clock interface (400kHz max); supports address 0x60 (7-bit) |
| 15–16 | PGND, GND | Power ground (PGND) and signal ground (GND); separate pins minimize noise coupling |
| 17 | EN | Enable input with 5ms minimum pulse width; logic-high >0.9V enables device |
| 18 | V18 | Internal 1.8V LDO output; powers internal logic and serves as reference for RSDT/TEMP |
| 19 | TEMP | NTC thermistor interface; enables LED current foldback above programmed temperature |
| 20 | ISET | Current-setting reference input; 0.75V target sets full-scale LED current via external resistor |
| 21 | FLTB | Open-drain fault flag output; asserts low on thermal shutdown, open/short LED, or OV/UV |
| 22 | DIM | Analog dimming input; 0–1.6V range controls LED current linearly (0–100%) |
| 23 | LEDGND | Dedicated LED return path; isolated from PGND/GND to reduce noise in current sensing |
| 24 | SSDONE | Spread spectrum completion indicator; goes high when dithering stabilizes after startup |
Key Features
| Feature | Design Value |
|---|---|
| Hybrid Dimming | Combines analog and PWM dimming to achieve 16667:1 ratio without visible flicker or color shift |
| Programmable Phase-Shifting | Reduces peak input current and conducted EMI by staggering channel switching up to 90° |
| Integrated Boost Controller | Eliminates need for external controller IC; supports boost or SEPIC with single inductor |
| Automated Fade-In/Fade-Out | On-chip timing logic smoothly transitions brightness during dimming changes-no host MCU overhead |
| Comprehensive Fault Diagnostics | Real-time detection of open/short LEDs, thermal events, boost UV/OV, and OUT_ unused conditions via I²C registers |
| Low-Voltage Operation Mode | Activates below 5.7V input to extend runtime during battery brownout while maintaining LED regulation |
Applications
| Automotive Instrument Clusters | Automotive Central Information Displays |
|---|---|
Use Scenario: High-brightness, variable-contrast TFT-LCD backlighting behind analog gauges and digital readouts in vehicle dashboards. IC Role / Device Role / Timing Role: Primary LED driver managing four independent backlight zones with synchronized dimming and fault monitoring. Use Value: Enables AEC-Q100-compliant, flicker-free illumination across –40°C to +125°C with automatic thermal foldback to prevent LED degradation. |
Use Scenario: Backlighting for large-format infotainment touchscreens requiring uniform luminance and dynamic contrast adjustment. IC Role / Device Role / Timing Role: Four-channel current sink delivering matched 120mA per string with I²C-configurable dimming curves and fade timing. Use Value: Supports hybrid dimming for seamless brightness transitions and spread-spectrum switching to meet CISPR-25 Class 5 EMI limits. |
| Automotive Head-Up Displays | Advanced Driver Assistance Systems (ADAS) Displays |
Use Scenario: Compact, high-efficiency backlight for projection-based HUDs where thermal density and EMI must be minimized. IC Role / Device Role / Timing Role: Integrated boost + LED driver providing regulated current with phase-shifted outputs to suppress ripple-induced image artifacts. Use Value: Delivers stable 120mA per channel at 3V post-startup-critical for engine cranking scenarios-and includes short-to-GND detection for safety-critical systems. |
Use Scenario: Backlighting for ADAS warning indicators (e.g., lane departure, blind spot) requiring instant-on response and fault resilience. IC Role / Device Role / Timing Role: Fault-aware LED driver with FLTB assertion and I²C-readable status registers for ASIL-B–compatible diagnostics. Use Value: Provides open/short LED detection, thermal warning at 125°C, and shutdown at 160°C-enabling fail-safe display behavior per ISO 26262 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX25612ATG/V+T | Same pinout and feature set; adds integrated high-side switch for direct LED string disconnect (replaces external NMOS + NGATE) | Reduces BOM count and layout area; eliminates need for external series MOSFET and gate driver components | Select when simplifying power path design and reducing component count is prioritized over cost-sensitive discrete switch implementation |
| LM3409QMY/NOPB | Controller-only (no integrated FET or LED sinks); requires external MOSFET and current sense; no I²C or diagnostics | Targeted at cost-optimized, non-diagnostic designs with fixed dimming and manual fault handling | Select only if system-level diagnostics, multi-channel synchronization, and AEC-Q100 Grade 1 compliance are not required |
Compared with MAX25612ATG/V+T, the MAX25512ATG/V+T requires an external NMOS for string disconnect but offers identical dimming, diagnostics, and thermal management; versus LM3409QMY/NOPB, it provides full integration, I²C configurability, and automotive-grade fault coverage-making it suitable for safety-critical displays.
Availability
MAX25512ATG/V+T is available at Aetrix Electronics and suitable for automotive instrument clusters, central information displays, and head-up displays requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for MAX25512ATG/V+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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The MAX25512ATG/V+T belongs to Analog Devices' automotive LED driver product line, engineered specifically for high-reliability, EMI-conscious backlighting in instrument clusters, HUDs, and infotainment systems under extreme temperature and voltage conditions.
FAQ
What is the maximum LED current per channel supported by the MAX25512ATG/V+T?
The MAX25512ATG/V+T supports up to 120mA per channel, verified across temperature (–40°C to +125°C) and input voltage (3V–36V). At 120mA setting (RISET = 12.5kΩ), output current is guaranteed 116–124mA with ±2.2% channel-to-channel matching, enabling uniform brightness in multi-string automotive displays.
Does the MAX25512ATG/V+T support external clock synchronization?
Yes, the MAX25512ATG/V+T supports external clock synchronization via the RT pin. An AC-coupled external clock signal (400kHz–2.2MHz) can be applied to RT to lock the internal oscillator, reducing beat frequencies and improving EMI predictability in multi-converter systems-confirmed in the Electrical Characteristics table and Functional Diagrams section.
How does the MAX25512ATG/V+T handle thermal overload conditions?
The MAX25512ATG/V+T implements dual-stage thermal protection: a thermal warning flag asserts at +125°C (readable via I²C or monitored externally), and hard thermal shutdown occurs at +160°C with 17°C hysteresis. Both thresholds are AEC-Q100 Grade 1 qualified and tested across temperature, ensuring reliable operation in under-hood automotive environments.
Can the MAX25512ATG/V+T operate from a 3V supply after startup?
Yes-the MAX25512ATG/V+T maintains regulation and full functionality down to 3V on the IN pin after startup, as specified in the Electrical Characteristics table under "Operating Voltage Range after Startup." This enables continued backlight operation during automotive cold-crank events where battery voltage dips transiently below 4.5V.
What diagnostic functions are accessible through the I²C interface of the MAX25512ATG/V+T?
The MAX25512ATG/V+T exposes comprehensive diagnostics via its I²C interface, including real-time status of open/short LED faults per channel, thermal warning/shutdown, boost undervoltage/overvoltage, OUT_ unused detection, and RSDT threshold violations. All flags are individually readable in dedicated status registers (e.g., FAULT_STATUS_1/2), enabling precise root-cause analysis without additional hardware.
MAX25512ATG/V+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- -
- Current - Output / Channel:
- 120mA
- Frequency:
- 400kHz ~ 2.2MHz
- Dimming:
- Analog, I2C, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TQFN (4x4)
MAX25512ATG/V+T FAQ
1.How can I place an order for MAX25512ATG/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25512ATG/V+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 MAX25512ATG/V+T reliable?
The price and inventory of MAX25512ATG/V+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX25512ATG/V+T is usually 5 days.
3.What payment methods are accepted for MAX25512ATG/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25512ATG/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25512ATG/V+T?
MAX25512ATG/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25512ATG/V+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 MAX25512ATG/V+T?
For technical support, including MAX25512ATG/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25512ATG/V+T requirements.
6.How does Aetrix verify that MAX25512ATG/V+T is sourced from the original manufacturer or authorized distributors?
All MAX25512ATG/V+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 MAX25512ATG/V+T meets industry standards.
7.What is the process for return or replacement of MAX25512ATG/V+T?
All MAX25512ATG/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX25512ATG/V+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 MAX25512ATG/V+T part is unused and in its original packaging.
Return procedure for MAX25512ATG/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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