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Analog Devices Inc./Maxim Integrated MAX25254DAFDJ/VY+
- Part No.:
- MAX25254DAFDJ/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 23-PowerWFQFN
- Datasheet:
-
MAX25254DAFDJ/VY+.pdf
- Description:
- IC REG BCK PRG 8A/8A DL 23FC2QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX25254DAFDJ/VY+ from Analog Devices is a dual-channel, automotive-grade synchronous buck converter IC with integrated high-side and low-side MOSFETs, delivering up to 8A per channel across 3V–36V input, featuring ASIL B safety compliance, 12µA no-load quiescent current, and 23-pin FC2QFN (4.50mm × 5.75mm) packaging - deployed in front-end power supplies for automotive head units and telematics modules.
For engineers reviewing the MAX25254DAFDJ/VY+ datasheet, MAX25254DAFDJ/VY+ pinout, MAX25254DAFDJ/VY+ application, or MAX25254DAFDJ/VY+ equivalent, key selection criteria include dual-phase capability (up to 16A), programmable output (0.8V–14V), 2MHz switching frequency option, spread-spectrum EMI reduction, and die temperature monitoring via TEMP pin - all validated for AEC-Q100 Grade 1 (-40°C to +125°C ambient).
Technical Context
The MAX25254DAFDJ/VY+ implements two independent PWM-controlled buck regulators sharing a common BIAS LDO and thermal sensing circuitry, each supporting forced-PWM or skip-mode operation via SYNC pin control. Its MAXQ® power architecture delivers precision transient response and phase margin optimization without external compensation.
Dual-phase configuration uses 180° out-of-phase switching between channels, while quad-phase operation (with companion ICs like MAX25254Q) leverages SYNCOUT-to-SYNC cascading and VEA node coupling for ±10% current sharing accuracy. Diagnostics include PGOOD1/PGOOD2 open-drain outputs with programmable UV/OV thresholds and internal die temperature monitoring (0.75V @ 25°C, 1.0V @ 125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 36V (42V absolute max); supports automotive battery transients including load dump. |
| Output Current per Channel | Up to 8A continuous at 400kHz; 6A at 2MHz - enables compact magnetics or higher efficiency trade-offs. |
| Quiescent Current | 12µA (typ) with one channel enabled - critical for always-on automotive systems with strict sleep-mode budgets. |
| Switching Frequency Options | 200kHz / 400kHz / 1MHz / 2MHz; fixed-frequency selection avoids AM band interference and simplifies EMI filtering. |
| Output Voltage Range | 0.8V to 14V (adjustable via external resistor divider on FB1/FB2); fixed options also available - supports diverse SoC core and I/O rail requirements. |
| Safety Certification | ASIL B compliant (per MAX25255 variant); MAX25254DAFDJ/VY+ is the non-ASIL B version but shares identical architecture, package, and pinout - suitable for non-safety-critical dual-buck applications. |
| Thermal Protection | Thermal shutdown at 175°C with 15°C hysteresis; junction-to-board θJB = 6.9°C/W on 4-layer JEDEC board - enables high-power density layout without forced air. |
Pinout & Package
MAX25254DAFDJ/VY+ is housed in a 23-pin FC2QFN package (4.50mm × 5.75mm, 0.5mm pitch) with exposed thermal pad. Pin 1 is SYNC (top-left corner, marked dot). The package supports high-current routing via dedicated PGND1/PGND2 pins and separate SUP1/SUP2 supplies for optimal noise isolation and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SYNC) | Synchronization input | Configures FPWM (high) or skip mode (low); accepts external clock for frequency synchronization - essential for multiphase timing alignment. |
| 2 (EN2), 13 (EN1) | Channel enable inputs | High-voltage tolerant (≥1.8V logic); allow independent channel control and battery-direct connection for always-on operation. |
| 3 (BST2), 12 (BST1) | Bootstrap supply terminals | Require 0.1µF ceramic capacitor to LXx; enable high-side gate drive for integrated MOSFETs - critical for duty cycle >95% dropout operation. |
| 4 (LX2), 11 (LX1) | Power switch nodes | Connect to external inductors; high-impedance when respective channel disabled - prevents shoot-through during sequencing. |
| 6 (PGND2), 9 (PGND1) | Power ground returns | Separate low-impedance paths for each channel's return current - minimizes ground bounce and improves current sharing in dual-phase mode. |
| 14 (SYNCOUT) | 90° out-of-phase clock output | Drives SYNC of secondary IC in quad-phase configuration; active only in FPWM mode - enables precise interleaving without external timing IC. |
| 15 (PGOOD1), 23 (PGOOD2) | Open-drain power-good indicators | Assert low during startup, UV/OV fault, or thermal shutdown - provides system-level fault signaling without additional supervision circuitry. |
| 16 (OUT1/FB1), 22 (OUT2/FB2) | Output sense / feedback inputs | Fixed-output mode: connect OUTx to VOUT; adjustable mode: use resistor divider to AGND - sets regulation point with ±1% accuracy (PWM mode). |
| 17 (TEMP) | Die temperature monitor | Analog voltage output (0.75V @ 25°C, scales linearly: VTEMP = 2.6×TJ + 685 mV); enables real-time thermal derating in firmware. |
| 18 (VEA) | Error amplifier output | Used only in multiphase configurations; ties primary and secondary ICs' control loops together for balanced current sharing - eliminates need for external current-sense amplifiers. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase operation support | Two channels operate 180° out-of-phase within single IC - reduces input/output ripple by ~70% vs. single-phase, enabling smaller bulk capacitors. |
| Spread-spectrum modulation | ±6% frequency dithering centered at fSW; lowers peak EMI by spreading energy across spectrum - meets CISPR 25 Class 5 without added shielding. |
| EXTVCC switchover | Automatically switches BIAS LDO input from SUP1 to EXTVCC (e.g., buck output) when valid voltage present - cuts LDO power loss and improves light-load efficiency. |
| Ultra-low dropout operation | Supports 99% duty cycle in dropout region - maintains regulation down to VIN − VOUT < 100mV, critical for cold-crank automotive scenarios. |
| Integrated current-limit protection | Programmable high-side ILIM (9.0–14.0A depending on fSW) and low-side negative current limit (−2.5A to −4.1A) - enables robust short-circuit recovery without external sensing. |
Applications
| Front-End Power Supply for Head Units | Telematics Module Power |
|---|---|
|
Use Scenario: Powers ADAS processor, display controller, and audio DSP in automotive infotainment head units requiring dual regulated rails (e.g., 1.1V core + 3.3V I/O) under wide battery voltage range (6V–16V). IC Role / Device Role / Timing Role: Dual synchronous buck regulator providing independent, tightly regulated DC outputs with PGOOD monitoring and thermal derating via TEMP pin. Use Value: Eliminates need for discrete controllers + external MOSFETs; 12µA quiescent current extends battery life in parked mode; 23-pin QFN fits space-constrained dash layouts. |
Use Scenario: Supplies LTE modem, GNSS receiver, and CAN transceiver in vehicle telematics control units operating continuously with strict EMC and thermal constraints. IC Role / Device Role / Timing Role: Dual-phase configured buck delivering 12V→5V/3.3V with interleaved switching to reduce conducted emissions on shared PCB power planes. Use Value: Spread-spectrum mode suppresses narrowband EMI peaks; ASIL-ready architecture (shared with MAX25255) simplifies functional safety documentation for ISO 26262 compliance. |
| Front Camera Power System | General-Purpose Dual Buck Converter |
|
Use Scenario: Powers high-resolution CMOS image sensor and ISP in automotive front camera modules where EMI must not interfere with RF receivers (e.g., GPS, cellular). IC Role / Device Role / Timing Role: Synchronous buck converter running at 2MHz with spread spectrum and 24ns minimum on-time - enables ultra-small 0.47µH inductors and minimal footprint. Use Value: Low EMI profile avoids desensitizing adjacent RF front-ends; 180° phase shift between channels halves input capacitor RMS current - extends capacitor lifetime. |
Use Scenario: Provides dual isolated DC rails in industrial HMIs, gateway controllers, or test equipment needing flexible, high-current step-down conversion outside automotive environments. IC Role / Device Role / Timing Role: Programmable dual buck regulator with adjustable outputs (0.8V–14V), external sync capability, and robust overvoltage/undervoltage protection. Use Value: Pin-compatible with MAX25255 variants allows design reuse across safety and non-safety platforms; EXTVCC switchover improves efficiency when powered from intermediate bus rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX25255DAFDJ/VY+ | Identical pinout, package, and electrical specs except ASIL B certification, redundant reference, and programmable UV/OV thresholds (±1% vs. ±3% for MAX25254). | Required for ASIL B–compliant subsystems (e.g., ADAS domain controllers); adds diagnostic coverage but increases cost and validation effort. | Select MAX25255DAFDJ/VY+ only if functional safety certification is mandated; otherwise MAX25254DAFDJ/VY+ offers full performance at lower BOM cost. |
| TPS653211AQPWPRQ1 | Single-chip dual buck (3A + 3A), 3.5V–36V input, AEC-Q100 qualified; lacks multiphase capability, spread spectrum, and die temperature monitor - no VEA or TEMP pins. | Suitable for lower-current (<6A/channel), cost-sensitive automotive body electronics; no support for >8A/channel or quad-phase scaling. | Choose TPS653211AQPWPRQ1 for simpler, lower-power designs where 8A/channel and advanced EMI/thermal features are unnecessary. |
Compared with MAX25255DAFDJ/VY+, the MAX25254DAFDJ/VY+ omits safety-critical diagnostics but retains identical power stage, thermal performance, and multiphase scalability - making it optimal for non-ASIL applications demanding maximum current density and EMI control. Versus TPS653211AQPWPRQ1, it delivers 33% higher per-channel current, quad-phase readiness, and superior thermal monitoring - justifying its use in high-performance automotive power rails.
Availability
MAX25254DAFDJ/VY+ is available at Aetrix Electronics and suitable for automotive head unit power supplies, telematics module designs, and front-camera power systems requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for MAX25254DAFDJ/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 power management semiconductors, serving automotive, industrial, communications, and healthcare markets with robust, reliability-tested components.
The MAX25254/MAX25255 product line was designed specifically for demanding automotive power conversion - emphasizing low IQ, wide VIN, ASIL-ready architecture, and multiphase scalability to replace discrete DC-DC solutions in next-generation E/E architectures.
FAQ
What is the maximum output current per channel for MAX25254DAFDJ/VY+?
The MAX25254DAFDJ/VY+ delivers up to 8A per channel continuously. This rating is achieved at 400kHz switching frequency; at 2MHz, the continuous current is 6A due to increased switching losses. The device supports dual-phase operation internally (16A total) and quad-phase externally (32A total) using multiple ICs - all verified in the datasheet's Electrical Characteristics and Applications Information sections.
Does MAX25254DAFDJ/VY+ support adjustable output voltage?
Yes, MAX25254DAFDJ/VY+ supports adjustable output voltage from 0.8V to 14V using external resistor dividers on FB1 and FB2 pins. The feedback reference voltage is 0.8V (typ), and accuracy is ±1% in PWM mode. Fixed-output versions are also available, but MAX25254DAFDJ/VY+ is the adjustable variant - confirmed by pin descriptions, Electrical Characteristics table (VFB_PWM_EXT), and Applications Information section.
How does the EXTVCC pin function on MAX25254DAFDJ/VY+?
The EXTVCC pin on MAX25254DAFDJ/VY+ enables switchover of the internal 1.8V BIAS LDO input from SUP1 to an external supply (e.g., a buck output rail). When VEXTVCC exceeds 2.50V (typ), the LDO automatically switches to EXTVCC, reducing power dissipation and improving light-load efficiency. If VEXTVCC drops below 2.41V (typ), it reverts to SUP1 - fully detailed in the Detailed Description and Applications Information sections.
Is MAX25254DAFDJ/VY+ AEC-Q100 qualified and what grade does it meet?
Yes, MAX25254DAFDJ/VY+ is AEC-Q100 qualified and meets Grade 1 specifications, supporting operation from −40°C to +125°C ambient temperature. This qualification is explicitly stated in the Benefits and Features list and confirmed in the Absolute Maximum Ratings and Thermal Parameters tables - ensuring suitability for under-hood and dashboard automotive applications.
Can MAX25254DAFDJ/VY+ be used in multiphase configurations?
Yes, MAX25254DAFDJ/VY+ supports both dual-phase (within one IC, 180° out-of-phase) and quad-phase (two ICs, 90° out-of-phase) operation. Dual-phase uses internal channel interleaving; quad-phase requires connecting SYNCOUT of the primary IC to SYNC of the secondary IC and tying VEA pins together - all documented in the Multiphase Operation section and Functional Diagrams.
MAX25254DAFDJ/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 23-PowerWFQFN
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 14V
- Current - Output:
- 8A, 8A
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 23-FC2QFN (4.5x5.75)
MAX25254DAFDJ/VY+ FAQ
1.How can I place an order for MAX25254DAFDJ/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25254DAFDJ/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 MAX25254DAFDJ/VY+ reliable?
The price and inventory of MAX25254DAFDJ/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX25254DAFDJ/VY+ is usually 5 days.
3.What payment methods are accepted for MAX25254DAFDJ/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25254DAFDJ/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25254DAFDJ/VY+?
MAX25254DAFDJ/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25254DAFDJ/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 MAX25254DAFDJ/VY+?
For technical support, including MAX25254DAFDJ/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25254DAFDJ/VY+ requirements.
6.How does Aetrix verify that MAX25254DAFDJ/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX25254DAFDJ/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 MAX25254DAFDJ/VY+ meets industry standards.
7.What is the process for return or replacement of MAX25254DAFDJ/VY+?
All MAX25254DAFDJ/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX25254DAFDJ/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 MAX25254DAFDJ/VY+ part is unused and in its original packaging.
Return procedure for MAX25254DAFDJ/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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