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Analog Devices Inc./Maxim Integrated MAX25254AFDE/VY+T
- Part No.:
- MAX25254AFDE/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 23-PowerWFQFN
- Datasheet:
-
MAX25254AFDE/VY+T.pdf
- Description:
- IC REG BCK PRG 8A/8A DL 23FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,246
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Product details
Overview
MAX25254AFDE/VY+T from Analog Devices is a dual-channel, AEC-Q100 qualified synchronous buck converter IC with integrated high-side and low-side MOSFETs, delivering up to 8A per channel across 3V–36V input range, featuring 12µA no-load quiescent current, ASIL B safety compliance (via MAX25255 variant), and multiphase capability for automotive front-end power supplies.
For engineers reviewing the MAX25254AFDE/VY+T datasheet, MAX25254AFDE/VY+T pinout, MAX25254AFDE/VY+T application, or MAX25254AFDE/VY+T equivalent, this page delivers verified technical context, exact pin functions, real-world multiphase design constraints, and validated alternative options for head unit, telematics, and front-camera power systems.
Technical Context
The MAX25254AFDE/VY+T implements two independent PWM-controlled buck regulators sharing a common 1.8V internal BIAS LDO, with programmable switching frequencies (200kHz/400kHz/1MHz/2MHz), forced-PWM or skip-mode operation via SYNC pin, and 180° out-of-phase dual-phase configuration within a single die. It supports EXTVCC switchover to reduce internal power dissipation and uses MAXQ® architecture for precision transient response and phase margin control.
Each channel features cycle-by-cycle current limiting (9.0–12.5A high-side ILIM), ±1% output voltage accuracy in PWM mode, 24ns minimum on-time, 99.6% max duty cycle for dropout operation, and integrated die temperature monitoring via TEMP pin (0.75V at +25°C, scaling linearly to 1.0V at +125°C). PGOOD1/PGOOD2 provide open-drain fault reporting with configurable UV/OV thresholds only in MAX25255 - the MAX25254AFDE/VY+T uses fixed thresholds (92.5% UV / 107.5% OV).
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 without external protection. |
| Output Current per Channel | Up to 8A continuous; derated to 6A at 2MHz, full 8A at ≤400kHz; enables compact 12V→3.3V/5V conversion in space-constrained modules. |
| Quiescent Current | 12µA (typ) with one channel enabled; meets ultra-low-power always-on requirements for infotainment and ADAS subsystems. |
| Switching Frequency | 200kHz / 400kHz / 1MHz / 2MHz; selectable via pin-strapping; 2MHz enables smallest inductor/capacitor footprint but trades efficiency. |
| Output Voltage Options | Fixed (e.g., 3.3V, 5V) or adjustable (0.8V–14V via external resistor divider on FB1/FB2); FB voltage regulated to 0.8V (±1%) in adjustable mode. |
| Thermal Protection | Thermal shutdown at +175°C with 15°C hysteresis; junction-to-board thermal resistance θJB = 6.9°C/W on 4-layer JEDEC board. |
| Safety Certification | AEC-Q100 Grade 1 (−40°C to +125°C ambient); MAX25254AFDE/VY+T is non-ASIL-B - diagnostics and redundant circuits are exclusive to MAX25255 variants. |
Pinout & Package
MAX25254AFDE/VY+T is housed in a 4.50mm × 5.75mm, 23-pin FC2QFN package with exposed thermal pad (pin 13 PGND1 and pin 6 PGND2 serve as primary thermal paths). The package supports high-current routing and efficient heat dissipation in automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SYNC) | Synchronization control input | Drives FPWM (high) or skip mode (low); accepts external clock for frequency synchronization; no clock output in skip mode. |
| 2 (EN2), 13 (EN1) | Independent enable inputs | High-voltage compatible (down to 1.8V logic); allow battery-direct connection for always-on Buck2/Buck1 operation. |
| 3 (BST2), 12 (BST1) | Bootstrap supply terminals | Require 0.1µF ceramic capacitor to respective LX pin; enable high-side gate drive for integrated MOSFETs. |
| 4 (LX2), 11 (LX1) | Switch-node outputs | Connect to inductors; high-impedance when corresponding buck is disabled; support 10A RMS continuous current. |
| 6 (PGND2), 9 (PGND1), 13 (PGND1) | Power ground returns | Dedicated low-inductance paths for each buck's return current; require multiple vias to inner ground plane for thermal and EMI performance. |
| 7 (SUP2), 8 (SUP1) | High-side MOSFET supply inputs | Bypassed with 0.1µF + 4.7µF ceramics; SUP1 also powers internal BIAS LDO unless EXTVCC is active. |
| 14 (SYNCOUT) | 90° out-of-phase clock output | Used only in quad-phase configurations (with secondary IC); inactive in skip mode or external sync; requires FPWM operation. |
| 15 (PGOOD1), 23 (PGOOD2) | Open-drain power-good indicators | Pull low during startup, UV (92.5% nominal), or OV (107.5% nominal); require external pull-up to BIAS or system rail. |
| 16 (OUT1/FB1), 22 (OUT2/FB2) | Output sense / feedback inputs | Fixed-output version: connect OUTx to VOUT; adjustable version: connect FBx to resistor divider (0.8V reference). |
| 17 (TEMP) | Die temperature monitor | Analog voltage output (0.75V @ +25°C, 1.0V @ +125°C); enables real-time thermal management; functional only in FPWM mode. |
| 18 (VEA) | Error amplifier output | Used only in multiphase (dual/quad) setups; ties primary and secondary VEA nodes for current balancing and shared loop control. |
| 20 (BIAS) | Internal 1.8V LDO output | Supplies gate drivers and analog circuitry; bypass with ≥4.7µF ceramic; not intended for external loads. |
| 21 (EXTVCC) | BIAS LDO switchover input | When valid voltage (>2.4V) applied, reduces internal power dissipation by sourcing BIAS from buck output instead of SUP1. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck regulation | Two fully autonomous 36V-input, 8A-output channels with separate EN, PGOOD, and feedback - enables split-rail or redundant power domains. |
| Multiphase scalability | Single-IC dual-phase (16A) or dual-IC quad-phase (32A) operation supported via SYNCOUT→SYNC chaining and VEA node tying - no external controller needed. |
| Ultra-low IQ operation | 12µA quiescent current with one channel active - sustains battery life in parked vehicle scenarios without compromising wake-up responsiveness. |
| Dropout-capable regulation | 99.6% maximum duty cycle allows stable output even when VIN drops near VOUT (e.g., 5.5V input → 5.0V output), critical for cold-crank conditions. |
| Robust protection suite | Cycle-by-cycle current limit, hiccup-mode short-circuit protection, thermal shutdown (+175°C), and precise UV/OV monitoring on both outputs. |
| EMI-optimized design | Spread-spectrum option (±6% frequency dither) and 24ns min on-time enable clean switching in noise-sensitive RF zones like camera modules. |
Applications
| Front-End Power Supply for Head Units | Telematics Modules |
|---|---|
Use Scenario: Powers SoC, display interface, audio codec, and USB peripherals in automotive infotainment head units with strict 12V battery input and thermal envelope limits. IC Role / Device Role / Timing Role: Dual-buck regulator delivering isolated 3.3V (SoC I/O) and 5.0V (USB/host) rails; operates in FPWM mode for low noise and tight transient response. Use Value: Eliminates need for discrete controllers + MOSFETs; 12µA IQ extends battery runtime during key-off; 4.5×5.75mm FC2QFN saves >40% board area vs. dual discrete solutions. |
Use Scenario: Supplies LTE/V2X modem, GNSS receiver, and MCU in vehicle connectivity gateways requiring high reliability and ASIL-aware power sequencing. IC Role / Device Role / Timing Role: Primary power source for modem subsystem; EN1/EN2 enable independent power-up sequencing; PGOOD1/PGOOD2 feed system health monitoring. Use Value: AEC-Q100 qualification ensures field reliability; 36V input withstands jump-start surges; dual-phase capability scales to 16A for future 5G modems without redesign. |
| Front Camera Power | General-Purpose Dual Buck Converters |
Use Scenario: Powers image sensor, ISP, and serializer in ADAS front-facing cameras where EMI must not interfere with pixel data integrity. IC Role / Device Role / Timing Role: Low-noise dual buck providing 1.2V (sensor core) and 2.8V (I/O) rails; spread-spectrum enabled to suppress narrowband EMI peaks near pixel clock harmonics. Use Value: 24ns min on-time supports high-frequency 2MHz operation for minimal inductor size; thermal shutdown protects against lens-heating-induced junction rise. |
Use Scenario: Replaces discrete DC-DC designs in industrial HMIs, medical displays, and test equipment needing dual regulated outputs from wide-input sources. IC Role / Device Role / Timing Role: Compact, self-contained dual buck solution with adjustable outputs (0.8V–14V); simplifies BOM and layout versus controller+FET+driver combos. Use Value: Reduces component count by ≥12 parts per channel; EXTVCC switchover improves light-load efficiency by shifting BIAS supply from SUP1 to VOUT. |
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 |
|---|---|---|---|
| MAX25255AFDE/VY+T | ASIL B-compliant variant with redundant reference, die temp monitor, and programmable UV/OV thresholds (±1% accuracy); adds ~$0.35 cost premium. | Required for ISO 26262 ASIL B automotive safety goals; supports diagnostic logging and fail-safe shutdown sequences. | Select MAX25255AFDE/VY+T when functional safety certification is mandatory; MAX25254AFDE/VY+T suffices for non-safety-critical head unit or telematics rails. |
| LM61480QRNXTQ1 | Single-channel 36V, 8A buck (not dual); 12µA IQ; AEC-Q100; no multiphase support; 1.5V–18V adjustable output; no EXTVCC switchover. | Suitable for point-of-load where only one rail is needed; lacks dual-phase scalability and die temperature monitoring. | Choose LM61480QRNXTQ1 for simpler, lower-cost single-rail designs; use MAX25254AFDE/VY+T when dual independent rails or future 16A scalability are required. |
Compared with MAX25255AFDE/VY+T, the MAX25254AFDE/VY+T omits safety-critical diagnostics but retains identical power stage, thermal, and multiphase capabilities - making it optimal for cost-sensitive non-ASIL applications. Versus LM61480QRNXTQ1, it delivers true dual-channel integration and quad-phase extensibility at the expense of higher channel count complexity.
Availability
MAX25254AFDE/VY+T 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 MAX25254AFDE/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 robust, reliable components.
The MAX25254/MAX25255 product line targets automotive power management, specifically engineered for ASIL-ready front-end DC-DC conversion in head units, ADAS sensors, and telematics gateways - emphasizing low IQ, wide VIN, and multiphase scalability.
FAQ
What is the maximum continuous output current per channel for MAX25254AFDE/VY+T?
The MAX25254AFDE/VY+T delivers up to 8A continuous output current per channel. This rating applies at switching frequencies ≤400kHz; at 2MHz, the current capability is derated to 6A due to increased conduction and switching losses. Both channels can operate simultaneously at full 8A under proper thermal management using the 4.50mm × 5.75mm FC2QFN package's thermal pad and recommended PCB layout.
Does MAX25254AFDE/VY+T support ASIL B functional safety requirements?
No, MAX25254AFDE/VY+T does not support ASIL B. It is AEC-Q100 qualified but lacks the redundant reference, programmable UV/OV thresholds, and diagnostic monitoring features required for ASIL B compliance. Those capabilities are exclusive to the MAX25255 variant (e.g., MAX25255AFDE/VY+T). For safety-critical applications, select the MAX25255 part number instead.
Can MAX25254AFDE/VY+T be used in dual-phase or quad-phase configurations?
Yes, MAX25254AFDE/VY+T supports both dual-phase (within a single IC, up to 16A) and quad-phase (two ICs, up to 32A) operation. Dual-phase uses internal 180° phase shift between Buck1 and Buck2. Quad-phase requires connecting SYNCOUT of the primary IC to SYNC of the secondary IC and tying VEA pins together for current balancing - all without external controllers.
What is the purpose of the EXTVCC pin on MAX25254AFDE/VY+T?
The EXTVCC pin on MAX25254AFDE/VY+T enables switchover of the internal 1.8V BIAS LDO supply from SUP1 to an external source (e.g., one of the buck outputs). When a valid voltage (>2.4V) is present, EXTVCC reduces internal power dissipation and improves light-load efficiency - especially useful when powering downstream circuitry from the same buck rail.
How does the PGOOD functionality differ between MAX25254AFDE/VY+T and MAX25255 variants?
MAX25254AFDE/VY+T uses fixed PGOOD thresholds: undervoltage at 92.5% and overvoltage at 107.5% of nominal output. In contrast, MAX25255 offers four programmable UV/OV threshold options (90–97.5% UV, 102.5–110% OV) with ±1% accuracy - a key differentiator for ASIL B diagnostic coverage. Both variants assert PGOOD low during soft-start and fault conditions.
MAX25254AFDE/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):
- 36V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 14V
- Current - Output:
- 8A, 8A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 23-FC2QFN (4.5x5.75)
MAX25254AFDE/VY+T FAQ
1.How can I place an order for MAX25254AFDE/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25254AFDE/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 MAX25254AFDE/VY+T reliable?
The price and inventory of MAX25254AFDE/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 MAX25254AFDE/VY+T is usually 5 days.
3.What payment methods are accepted for MAX25254AFDE/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25254AFDE/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25254AFDE/VY+T?
MAX25254AFDE/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25254AFDE/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 MAX25254AFDE/VY+T?
For technical support, including MAX25254AFDE/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25254AFDE/VY+T requirements.
6.How does Aetrix verify that MAX25254AFDE/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX25254AFDE/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 MAX25254AFDE/VY+T meets industry standards.
7.What is the process for return or replacement of MAX25254AFDE/VY+T?
All MAX25254AFDE/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX25254AFDE/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 MAX25254AFDE/VY+T part is unused and in its original packaging.
Return procedure for MAX25254AFDE/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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