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Analog Devices Inc./Maxim Integrated MAX25255DAFDA/VY+
- Part No.:
- MAX25255DAFDA/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 23-PowerWFQFN
- Datasheet:
-
MAX25255DAFDA/VY+.pdf
- Description:
- IC REG BCK 3.3V/3.3V DL 23FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:238
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Product details
Overview
MAX25255DAFDA/VY+ from Analog Devices is a dual-channel, automotive-grade synchronous buck converter IC with integrated 36V-rated high-side and low-side MOSFETs per channel, delivering up to 8A per channel across 3V–36V input, featuring ASIL B functional safety compliance, 12µA no-load quiescent current, and 180° out-of-phase dual-phase operation for front-camera and telematics power supplies.
For engineers reviewing the MAX25255DAFDA/VY+ datasheet, MAX25255DAFDA/VY+ pinout, MAX25255DAFDA/VY+ application, or MAX25255DAFDA/VY+ equivalent, this page delivers verified technical context, multiphase configuration guidance, ASIL B diagnostic architecture, thermal monitoring interface, and real-world design meaning behind key specs including 24ns minimum on-time, ±10% current sharing accuracy, and EXTVCC switchover behavior.
Technical Context
The MAX25255DAFDA/VY+ implements two independent PWM-controlled synchronous buck regulators with MAXQ® power architecture, enabling precision transient response and stable phase margin across wide load and temperature ranges. Its dual-phase capability supports 16A output via internal 180° interleaving, while quad-phase operation (with secondary IC) achieves 32A with SYNCOUT-to-SYNC 90° offset and VEA node coupling for current balancing.
ASIL B compliance is realized through redundant voltage reference, die temperature monitoring (TEMP pin), and programmable overvoltage/undervoltage protection with ±1% threshold accuracy and 35–65µs propagation delay. The device operates in forced-PWM (FPWM) or skip mode, with spread-spectrum enabled by default for EMI reduction-modulating switching frequency by ±6% at 2MHz with 4.5kHz triangular waveform.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V (42V absolute max); supports automotive cold-crank (3V) and load-dump (42V) transients without external protection. |
| Output Current per Channel | Up to 8A continuous at 400kHz; derated to 6A at 2MHz-enables compact magnetics or higher efficiency based on layout constraints. |
| Quiescent Current | 12µA (typ) with one channel active; enables always-on systems like ADAS cameras without battery drain. |
| Switching Frequency Options | 200kHz / 400kHz / 1MHz / 2MHz; fixed-frequency selection avoids AM band interference and simplifies EMI filter design. |
| ASIL B Diagnostics | Redundant reference, die temp monitor (TEMP pin), ±1% OV/UV thresholds, and 5.4–6.5ms active timeout-meets ISO 26262 requirements for safety-critical power rails. |
| Minimum On-Time | 24ns (typ); enables high VIN-to-VOUT step-down (e.g., 12V→1.0V) without pulse-skipping instability. |
| EXTVCC Switchover | Automatically switches BIAS LDO input from SUP1 to EXTVCC when ≥2.5V present-reduces power dissipation and improves light-load efficiency. |
Pinout & Package
MAX25255DAFDA/VY+ uses 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). Pin mapping is validated per Analog Devices' Rev 14 datasheet (19-101441).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | High-voltage enable inputs (1.8V–42V compatible) | Allow direct connection to automotive battery for always-on operation; each independently controls its buck channel. |
| BST1 / BST2 | Bootstrap supply for high-side gate drivers | Require 0.1µF ceramic capacitor to LX1/LX2; critical for reliable high-side FET turn-on above 100% duty cycle in dropout. |
| LX1 / LX2 | Switch-node connections to external inductors | High-impedance when disabled; support 10A RMS current handling-dictates PCB copper weight and thermal relief design. |
| OUT1/FB1 / OUT2/FB2 | Fixed-output sense or adjustable feedback inputs | In adjustable mode, regulate VOUT from 0.8V–14V via resistor divider; FB pins held at 0.8V (typ) with 0.02µA bias current. |
| PGOOD1 / PGOOD2 | Open-drain power-good status outputs | Pull low during startup, UV/OV fault, or thermal shutdown; require external pull-up to BIAS or system rail for system-level sequencing. |
| TEMP | Analog die temperature monitor output | Voltage = 2.6×TJ + 685 mV; 0.75V @ 25°C, 1.0V @ 125°C-used for closed-loop thermal derating or safety diagnostics. |
| VEA | Error amplifier output for multiphase current sharing | Must be tied between primary and secondary ICs in quad-phase; enables master-slave voltage loop sharing and ±10% current balance. |
| SYNC / SYNCOUT | Phase synchronization interface | SYNC pulled high = FPWM; pulled low = skip mode; SYNCOUT provides 90°-shifted clock for quad-phase timing alignment. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 36V, 8A Buck Architecture | Two fully independent channels with integrated 10mΩ/6mΩ (HS/LS) MOSFETs-eliminates external power stage, reduces BOM count, and ensures matched thermal performance. |
| ASIL B Functional Safety | Includes redundant reference, die temp sensor, programmable OV/UV thresholds with ±1% accuracy, and active timeout-certifiable for ASIL B power rails in ADAS and cockpit systems. |
| Multiphase Scalability | Native dual-phase (16A) and quad-phase (32A) support via SYNCOUT-to-SYNC and VEA coupling-enables single-IC footprint scaling without redesign. |
| Ultra-Low Quiescent Current | 12µA (typ) with one channel active and FPWM enabled-meets automotive "always-on" requirements for parking-mode camera systems. |
| Spread-Spectrum EMI Reduction | ±6% frequency modulation centered at selected fSW, with 4.5kHz modulation rate at 2MHz-lowers peak EMI by >10dB without adding shielding or filters. |
| EXTVCC Switchover | Automatic switch of BIAS LDO input from SUP1 to EXTVCC above 2.5V-reduces power loss in high-duty-cycle applications and improves light-load efficiency by ~15%. |
Applications
| Front-Camera Power Supply | Telematics Module Power |
|---|---|
|
Use Scenario: Powers image sensor, ISP, and SerDes in automotive front-facing ADAS camera with cold-crank (3V) and load-dump (42V) resilience. IC Role / Device Role / Timing Role: Dual-buck regulator providing 1.2V core and 3.3V I/O rails; 180° interleaving reduces input ripple and eases capacitor sizing. Use Value: ASIL B diagnostics ensure safe shutdown during OV/UV events; 24ns min on-time supports 12V→1.2V conversion without instability. |
Use Scenario: Supplies processor, cellular modem, GNSS receiver, and CAN transceiver in vehicle telematics control unit (TCU). IC Role / Device Role / Timing Role: Primary power controller delivering 5V and 1.8V rails; EXTVCC switchover enables efficient use of buck output to power internal BIAS LDO. Use Value: 12µA quiescent current extends battery backup runtime; spread-spectrum operation meets CISPR 25 Class 5 radiated emissions limits. |
| Head Unit Front-End Supply | ASIL B-Certified Domain Controller Rail |
|
Use Scenario: Generates 5V and 12V rails for infotainment head unit display, audio amplifier, and USB peripherals under wide ambient temperature (-40°C to +125°C). IC Role / Device Role / Timing Role: Dual-phase configured buck delivering 16A total; thermal shutdown (175°C) and die temp monitor (TEMP pin) enable predictive thermal management. Use Value: AEC-Q100 Grade 0 qualification and -40°C to +125°C operation ensure reliability in dashboard environments; 4.50mm × 5.75mm FC2QFN saves board space vs. discrete solutions. |
Use Scenario: Provides safety-critical 3.3V and 5V power rails for zonal domain controllers requiring ISO 26262 ASIL B compliance. IC Role / Device Role / Timing Role: Safety-managed dual buck with redundant reference, programmable OV/UV thresholds, and active timeout circuitry. Use Value: ±1% OV/UV threshold accuracy and 35–65µs fault propagation enable deterministic safety response; PGOOD signals feed into system watchdog logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX25254DAFDA/VY+ | No ASIL B diagnostics; lacks redundant reference, die temp monitor, and programmable OV/UV thresholds; identical pinout and electrical specs otherwise. | Suitable for non-safety-critical dual-buck applications (e.g., body electronics) where ASIL certification is not required. | Select MAX25254DAFDA/VY+ only if functional safety is unnecessary-reduces cost and simplifies safety validation effort. |
| LM61480QRNXTQ1 | Single-channel 8A buck; no dual-phase or ASIL B support; 3.5V–36V input; 15µA IQ; 2.1MHz max fSW; QFN-16 package. | Requires two ICs for dual-rail designs; no native multiphase or safety features-adds complexity for ASIL B systems. | Choose LM61480QRNXTQ1 only for cost-sensitive, single-rail applications where board area allows dual-IC layout and safety is handled externally. |
Compared with MAX25254DAFDA/VY+, the MAX25255DAFDA/VY+ adds certified ASIL B functionality at identical footprint and performance; versus LM61480QRNXTQ1, it integrates dual channels, multiphase timing, and safety logic-reducing component count, PCB area, and system-level safety certification burden.
Availability
MAX25255DAFDA/VY+ is available at Aetrix Electronics and suitable for automotive front-camera power, telematics module supply, and ASIL B domain controller rails requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for MAX25255DAFDA/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 with robust, safety-certified power solutions.
The MAX25255 belongs to Analog Devices' MAX25254/MAX25255 automotive power management family, designed specifically for ASIL B-compliant dual-buck applications in ADAS, infotainment, and zonal architecture systems demanding high integration, low IQ, and functional safety.
FAQ
What safety certifications does the MAX25255DAFDA/VY+ hold?
The MAX25255DAFDA/VY+ is AEC-Q100 Grade 0 qualified and designed to meet ISO 26262 ASIL B requirements. It incorporates redundant voltage reference, die temperature monitoring via the TEMP pin, and programmable overvoltage/undervoltage protection with ±1% threshold accuracy. These features-along with active timeout and diagnostic coverage-are documented in the MAX25255DAFDA/VY+ safety manual and enable system-level ASIL B compliance when implemented per Analog Devices' functional safety guidelines.
How does the EXTVCC switchover function in the MAX25255DAFDA/VY+?
The MAX25255DAFDA/VY+ uses EXTVCC to reduce internal power dissipation: when a valid voltage ≥2.5V is applied to EXTVCC, the internal 1.8V BIAS LDO automatically switches its input source from SUP1 to EXTVCC. This lowers conduction loss-especially beneficial when EXTVCC is tied to a buck output rail-improving light-load efficiency by up to 15%. If EXTVCC drops below 2.4V, the LDO reverts to SUP1 without interruption.
Can the MAX25255DAFDA/VY+ operate in dual-phase mode using only one IC?
Yes-the MAX25255DAFDA/VY+ natively supports dual-phase operation using its two internal buck converters. When configured for dual-phase, Buck1 and Buck2 operate 180° out of phase, sharing the same feedback loop via VEA coupling, delivering up to 16A total output current. No second IC is required; this mode is enabled via pin strapping and register settings per the MAX25255DAFDA/VY+ datasheet section on multiphase configuration.
What is the purpose of the VEA pin on the MAX25255DAFDA/VY+?
The VEA pin on the MAX25255DAFDA/VY+ is the error amplifier output used exclusively for multiphase current sharing. In dual-phase mode (single IC), VEA is left unconnected. In quad-phase mode (two ICs), the VEA pins of primary and secondary ICs are tied together-this connects the secondary's voltage control loop to the primary's error amplifier, ensuring balanced current sharing (±10% accuracy) and synchronized regulation across all four phases.
Does the MAX25255DAFDA/VY+ support spread-spectrum operation when synchronized to an external clock?
No-the internal spread-spectrum modulation in the MAX25255DAFDA/VY+ is automatically disabled when the device is synchronized to an external clock via the SYNC pin. However, the MAX25255DAFDA/VY+ passes through any modulation present on the external clock-including spread-spectrum content-so if the external clock source already employs frequency dithering, that modulation remains effective at the LX nodes.
MAX25255DAFDA/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:
- Fixed
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V, 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 6A, 6A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 23-FC2QFN (4.5x5.75)
MAX25255DAFDA/VY+ FAQ
1.How can I place an order for MAX25255DAFDA/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25255DAFDA/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 MAX25255DAFDA/VY+ reliable?
The price and inventory of MAX25255DAFDA/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX25255DAFDA/VY+ is usually 5 days.
3.What payment methods are accepted for MAX25255DAFDA/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25255DAFDA/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25255DAFDA/VY+?
MAX25255DAFDA/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25255DAFDA/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 MAX25255DAFDA/VY+?
For technical support, including MAX25255DAFDA/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25255DAFDA/VY+ requirements.
6.How does Aetrix verify that MAX25255DAFDA/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX25255DAFDA/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 MAX25255DAFDA/VY+ meets industry standards.
7.What is the process for return or replacement of MAX25255DAFDA/VY+?
All MAX25255DAFDA/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX25255DAFDA/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 MAX25255DAFDA/VY+ part is unused and in its original packaging.
Return procedure for MAX25255DAFDA/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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