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Analog Devices Inc./Maxim Integrated MAX25254DAFDJ/VY+T
- Part No.:
- MAX25254DAFDJ/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 23-PowerWFQFN
- Datasheet:
-
MAX25254DAFDJ/VY+T.pdf
- Description:
- IC REG BCK PRG 8A/8A DL 23FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,802
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Product details
Overview
MAX25254DAFDJ/VY+T from Analog Devices is a dual-channel, automotive-grade synchronous buck converter IC with integrated 8A-per-channel MOSFETs, ASIL B safety compliance (per MAX25255 variant family), 3V–36V input range, and multiphase capability supporting up to 16A in dual-phase configuration. It delivers precision regulation down to 0.8V output with ±1% accuracy in PWM mode and operates in automotive front-end power supplies for head units and telematics modules.
For engineers reviewing the MAX25254DAFDJ/VY+T datasheet, MAX25254DAFDJ/VY+T pinout, MAX25254DAFDJ/VY+T application, or MAX25254DAFDJ/VY+T equivalent, key selection criteria include its AEC-Q100 qualification, 23-pin FC2QFN package, 12µA no-load quiescent current, 24ns minimum on-time, and support for forced-PWM/skip-mode operation with spread-spectrum EMI reduction.
Technical Context
The MAX25254DAFDJ/VY+T implements two independent synchronous buck regulators sharing a common 1.8V internal BIAS LDO and thermal monitoring via the TEMP pin. Its MAXQ® power architecture enables high phase margin and fast transient response, with programmable switching frequencies (200kHz/400kHz/1MHz/2MHz) and 180° out-of-phase operation between channels for ripple cancellation.
Dual-phase operation is enabled by connecting SYNCOUT of one IC to SYNC of another, using VEA pin coupling for current balancing. The device supports EXTVCC switchover to reduce internal power dissipation and features cycle-by-cycle current limiting, hiccup-mode short-circuit protection, and thermal shutdown at 175°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 36V (42V absolute max); supports cold-crank and load-dump conditions in automotive systems. |
| Output Current per Channel | Up to 8A continuous (at 400kHz); derates to 6A at 2MHz for thermal management. |
| Quiescent Current | 12µA typical with one channel active; enables always-on functionality in low-power automotive modules. |
| Switching Frequency | 200kHz / 400kHz / 1MHz / 2MHz; selectable for trade-off between efficiency (lower fSW) and component size (higher fSW). |
| Output Voltage Accuracy | ±1% in PWM mode (−40°C to +125°C); ensures stable rail generation for sensitive SoCs and sensors. |
| Minimum On-Time | 24ns typical; enables high step-down ratios (e.g., 12V→1.0V) without pulse-skipping instability. |
| Package | 23-pin FC2QFN, 4.50mm × 5.75mm; optimized for thermal performance with dedicated PGND1/PGND2 pads and bottom-side thermal pad. |
Pinout & Package
MAX25254DAFDJ/VY+T is housed in a 23-pin FC2QFN package (4.50mm × 5.75mm) with exposed thermal pad. Pin 1 is SYNC; pins 6 and 9 are PGND2 and PGND1 respectively; pins 2 and 13 are EN2 and EN1; pins 3 and 12 are BST2 and BST1; pins 4 and 11 are LX2 and LX1; pins 15 and 23 are PGOOD1 and PGOOD2; pins 16 and 22 are OUT1/FB1 and OUT2/FB2; pin 17 is TEMP; pin 18 is VEA; pin 19 is AGND; pin 20 is BIAS; pin 21 is EXTVCC; pins 7 and 8 are SUP2 and SUP1; pins 5 and 10 are NC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | High-voltage enable inputs | Accept 1.8V–36V logic; allow direct battery tie for always-on operation; reduce IQ to 6.5µA in shutdown. |
| LX1 / LX2 | Switch-node connections | Drive external inductors; high-impedance when respective channel disabled; require 0.1µF BST-to-LX capacitors. |
| OUT1/FB1 / OUT2/FB2 | Output sense / feedback inputs | Fixed-output version: connect OUTx to output rail; adjustable version: use resistor divider to set 0.8V–14V with 0.8V reference. |
| PGOOD1 / PGOOD2 | Open-drain power-good indicators | Pull low during startup, undervoltage (<92.5%), or overvoltage (>107.5%); require external pull-up to BIAS or system rail. |
| TEMP | Die temperature monitor | Outputs voltage proportional to junction temp (0.75V @ 25°C, 1.0V @ 125°C); functional only in FPWM mode. |
| VEA | Error amplifier output | Used only in multiphase configurations; ties primary and secondary ICs for current balancing and shared voltage control loop. |
Key Features
| Feature | Design Value |
|---|---|
| Dual synchronous buck with integrated MOSFETs | Eliminates need for external high-side/low-side switches; reduces BOM count and layout complexity in space-constrained automotive PCBs. |
| Multiphase capability (dual/quad) | Enables 16A output with single IC (dual-phase) or 32A with two ICs (quad-phase); reduces output capacitor RMS current and input ripple. |
| ASIL B–compliant diagnostics (MAX25255 family) | Includes redundant reference, die temperature monitor, and programmable OV/UV thresholds with ±1% accuracy-valid for MAX25254DAFDJ/VY+T as member of ASIL-B–capable family. |
| Spread-spectrum EMI reduction | ±6% frequency modulation centered at fSW; lowers peak EMI emissions without requiring external filtering components. |
| EXTVCC switchover | Switches BIAS LDO input from SUP1 to regulated output rail, reducing internal power dissipation and improving light-load efficiency. |
Applications
| Front-End Power Supply for Head Units | Telematics Module Power |
|---|---|
Use Scenario: Powers infotainment SoC, display interface, and audio codecs in automotive head units under wide input transients (cold crank, load dump). IC Role / Device Role / Timing Role: Dual-buck regulator delivering isolated 5V and 3.3V rails with independent enable control and PGOOD monitoring. Use Value: 36V input rating and 99% dropout duty cycle maintain regulation during battery sag; 12µA IQ extends standby time in ignition-off state. | Use Scenario: Supplies LTE/V2X modem, GNSS receiver, and MCU in vehicle telematics control units operating across −40°C to +125°C ambient. IC Role / Device Role / Timing Role: Primary DC-DC source with AEC-Q100 qualification and ASIL B–level diagnostics for functional safety compliance. Use Value: Integrated temperature sensing and precise OV/UV protection prevent field failures; dual-phase mode supports >10A modem burst currents. |
| Front Camera Power System | General-Purpose Dual Buck Converter |
Use Scenario: Powers high-resolution ADAS camera modules requiring clean, low-noise 1.8V and 2.8V rails with fast transient response. IC Role / Device Role / Timing Role: Dual-channel buck converter with 24ns min-on-time enabling tight regulation at low VOUT; uses spread spectrum to meet CISPR-25 Class 5 EMI limits. Use Value: 180° phase shift between channels cuts input ripple by ~70%, reducing required input capacitance and board area. | Use Scenario: Replaces discrete buck controllers in industrial HMIs, gateway controllers, and sensor fusion nodes needing dual regulated outputs. IC Role / Device Role / Timing Role: Compact, high-efficiency dual buck solution with flexible fixed/adjustable outputs and minimal external components. Use Value: 23-pin FC2QFN package and integrated MOSFETs cut total solution size by >40% vs. controller+FET solutions; soft-start prevents inrush damage. |
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+T | ASIL B–certified with redundant reference, programmable OV/UV thresholds (±1% accuracy), and enhanced diagnostic coverage. | Required for ISO 26262 ASIL B–compliant systems where fault detection and reporting are mandatory. | Select MAX25255DAFDJ/VY+T when functional safety certification is required; MAX25254DAFDJ/VY+T suffices for non-ASIL designs with identical electrical specs. |
| LM61480QRNXTQ1 | Single-channel 8A buck; no dual-channel or multiphase capability; lower IQ (15µA); no ASIL support; 3.5V–36V input. | Suitable for simpler single-rail applications; lacks PGOOD2, VEA, SYNCOUT, and dual-phase coordination signals. | Choose LM61480QRNXTQ1 only when dual output is not needed; MAX25254DAFDJ/VY+T provides higher integration and system-level flexibility. |
Compared with MAX25255DAFDJ/VY+T, the MAX25254DAFDJ/VY+T omits redundant safety circuitry but retains identical power stage performance, pinout, and thermal characteristics-making it ideal for cost-sensitive, non-ASIL automotive subsystems. Against LM61480QRNXTQ1, it delivers true dual-rail independence and scalable current via multiphase, at the expense of slightly higher design complexity.
Availability
MAX25254DAFDJ/VY+T is available at Aetrix Electronics and suitable for automotive front-end power supplies, telematics modules, and ADAS camera systems requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for MAX25254DAFDJ/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 MAX25254/MAX25255 product line was designed specifically for demanding automotive power conversion applications-delivering robust dual-buck regulation with integrated safety features, multiphase scalability, and ultra-low quiescent current for always-on systems.
FAQ
What is the maximum output current per channel for MAX25254DAFDJ/VY+T?
The MAX25254DAFDJ/VY+T delivers up to 8A per channel continuously when operated at 400kHz switching frequency. At 2MHz, the rated output current is reduced to 6A to maintain thermal stability within the 23-pin FC2QFN package. Both channels can operate simultaneously, and dual-phase configuration enables up to 16A total output with proper layout and thermal management.
Does MAX25254DAFDJ/VY+T support adjustable output voltage?
Yes, MAX25254DAFDJ/VY+T supports adjustable output voltage from 0.8V to 14V using external resistor dividers connected to the OUT1/FB1 and OUT2/FB2 pins. The internal feedback reference is 0.8V (typ), and the device maintains ±1% output accuracy across temperature and load in PWM mode. Fixed-output variants are also available, but MAX25254DAFDJ/VY+T is the adjustable version.
What safety certifications does MAX25254DAFDJ/VY+T hold?
MAX25254DAFDJ/VY+T is AEC-Q100 qualified for automotive applications and belongs to the MAX25254/MAX25255 family that supports ASIL B compliance-though full ASIL B certification applies to the MAX25255 variant with redundant reference and enhanced diagnostics. MAX25254DAFDJ/VY+T shares the same package, pinout, and core power architecture, making it suitable for non-ASIL B–mandated subsystems requiring identical electrical performance.
How does the EXTVCC pin function on MAX25254DAFDJ/VY+T?
The EXTVCC pin on MAX25254DAFDJ/VY+T enables switchover of the internal 1.8V BIAS LDO input from SUP1 to an external supply (e.g., one of the buck outputs). When a valid voltage ≥2.5V is present, the LDO draws current from EXTVCC instead of SUP1, reducing power dissipation and improving light-load efficiency. If EXTVCC drops below ~2.4V, the device automatically reverts to SUP1 sourcing.
Can MAX25254DAFDJ/VY+T be used in quad-phase configuration?
Yes, MAX25254DAFDJ/VY+T supports quad-phase operation when paired with a second MAX25254Q or MAX25255D IC. The primary IC's SYNCOUT drives the secondary IC's SYNC pin to achieve 90° phase offset, while VEA pins are tied together for current balancing. This configuration delivers up to 32A total output current and requires forced-PWM mode; skip mode and external clock sync are not supported in quad-phase.
MAX25254DAFDJ/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 23-PowerWFQFN
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX25254DAFDJ/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25254DAFDJ/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 MAX25254DAFDJ/VY+T reliable?
The price and inventory of MAX25254DAFDJ/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 MAX25254DAFDJ/VY+T is usually 5 days.
3.What payment methods are accepted for MAX25254DAFDJ/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25254DAFDJ/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25254DAFDJ/VY+T?
MAX25254DAFDJ/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25254DAFDJ/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 MAX25254DAFDJ/VY+T?
For technical support, including MAX25254DAFDJ/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25254DAFDJ/VY+T requirements.
6.How does Aetrix verify that MAX25254DAFDJ/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX25254DAFDJ/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 MAX25254DAFDJ/VY+T meets industry standards.
7.What is the process for return or replacement of MAX25254DAFDJ/VY+T?
All MAX25254DAFDJ/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX25254DAFDJ/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 MAX25254DAFDJ/VY+T part is unused and in its original packaging.
Return procedure for MAX25254DAFDJ/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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