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Analog Devices Inc./Maxim Integrated MAX25255DAFDG/VY+
- Part No.:
- MAX25255DAFDG/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 23-PowerWFQFN
- Datasheet:
-
MAX25255DAFDG/VY+.pdf
- Description:
- IC REG BUCK 5V/5V DL 23FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:389
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Product details
Overview
MAX25255DAFDG/VY+ from Analog Devices is a dual-channel, automotive-grade synchronous buck converter IC with integrated 8A-per-channel MOSFETs, ASIL B functional safety certification, and multiphase capability. It operates from 3V to 36V input, delivers up to 8A per channel (16A in dual-phase), and features 12µA no-load quiescent current, 24ns minimum on-time, and 2MHz max switching frequency - optimized for front-camera and telematics power supplies in harsh automotive environments.
For engineers reviewing the MAX25255DAFDG/VY+ datasheet, MAX25255DAFDG/VY+ pinout, MAX25255DAFDG/VY+ application, or MAX25255DAFDG/VY+ equivalent, this page provides verified technical context, validated pin functions, confirmed ASIL B diagnostic architecture, real-world multiphase implementation constraints, and precise thermal and EMI performance data directly traceable to Analog Devices' official documentation.
Technical Context
The MAX25255DAFDG/VY+ implements two independent synchronous buck regulators sharing a common 4.50mm × 5.75mm 23-pin FC2QFN package, each with integrated high-side (10–50mΩ RDS(ON)) and low-side (6–24mΩ) DMOS switches. Its MAXQ® power architecture enables precision transient response and stable phase margin across 200kHz–2MHz programmable frequencies.
ASIL B compliance is achieved via redundant voltage reference, die temperature monitoring (TEMP pin), precision ±1% overvoltage/undervoltage protection with configurable thresholds (90–97.5% UV, 102.5–110% OV), and active timeout (6.0ms typ). Dual-phase operation requires SYNCOUT-to-SYNC interconnection and VEA node tying for ±10% current sharing accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 36V (42V absolute max); supports cold-crank and load-dump transients without external protection. |
| Output Current per Channel | Up to 8A continuous (at 400kHz); derates to 6A at 2MHz for thermal management in compact layouts. |
| Quiescent Current | 12µA (typ) with one channel enabled; enables always-on systems meeting ISO 16750-2 sleep-mode requirements. |
| Switching Frequency | 200kHz / 400kHz / 1MHz / 2MHz options; fixed-frequency PWM mode avoids AM-band interference. |
| ASIL B Diagnostics | Redundant reference, die temp monitor (0.75V @ 25°C), ±1% OV/UV accuracy, 50µs propagation delay for fault reporting. |
| Thermal Performance | θJC(bottom) = 4.8°C/W; θJA = 27.2°C/W on 4-layer JEDEC board - enables 16A dual-phase operation with minimal heatsinking. |
| Minimum On-Time | 24ns (typ); supports high VIN-to-VOUT conversion ratios (e.g., 24V→3.3V) without pulse-skipping instability. |
Pinout & Package
Package: 23-pin FC2QFN, 4.50mm × 5.75mm, exposed thermal pad (PGND1/PGND2 connected internally).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | High-voltage enable inputs | Direct battery connection (≥1.8V logic threshold); enable/disable Buck1/Buck2 independently for sequenced power-up. |
| BST1 / BST2 | Bootstrap supply terminals | Require 0.1µF ceramic capacitor to LX1/LX2; gate drive voltage source for integrated high-side MOSFETs. |
| LX1 / LX2 | Switch-node outputs | Connect to external inductors; high-impedance when respective channel disabled - prevents shoot-through in multiphase sync. |
| OUT1/FB1 / OUT2/FB2 | Feedback or fixed-output terminals | Fixed-output version: connect OUTx to output rail; adjustable version: FBx accepts resistor divider for 0.8V–14V programming. |
| VEA | Error amplifier output | Tied between primary/secondary ICs in quad-phase to force current sharing and extend control-loop bandwidth. |
| TEMP | Digital die temperature sensor | Outputs 0.75V @ 25°C, 1.00V @ 125°C (VTEMP = 2.6×TJ + 685 mV); active only in FPWM mode. |
| SYNC / SYNCOUT | Phase synchronization interface | SYNC: configure FPWM/skip mode or accept external clock; SYNCOUT: 90° out-of-phase clock for quad-phase stacking. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase operation | Two MAX25255DAFDG/VY+ ICs support 16A output with 180° interleaving - reduces input/output ripple by >70% vs. single-phase. |
| ASIL B safety architecture | Includes redundant voltage reference, independent OV/UV comparators with 50µs fault propagation, and die-temp-based thermal shutdown (175°C, 15°C hysteresis). |
| Spread-spectrum EMI reduction | ±6% frequency modulation centered at fSW; reduces peak radiated emissions by 10dB without altering filter design. |
| EXTVCC switchover | Automatically switches BIAS LDO input from SUP1 to EXTVCC (e.g., buck output) when VEXTVCC ≥ 2.5V - cuts internal power dissipation by >40% at light loads. |
| Ultra-low dropout operation | 99.6% max duty cycle enables regulation down to VIN – 0.3V (e.g., 3.6V→3.3V), critical for automotive cold-crank scenarios. |
Applications
| Front-Camera Power Supply | Telematics Module Core Rail |
|---|---|
|
Use Scenario: Powers image sensor, ISP, and SerDes in ADAS front-camera ECU under wide temperature (-40°C to +125°C) and load-dump conditions. IC Role / Device Role / Timing Role: Dual-buck regulator delivering 3.3V/1.8V rails with PGOOD1/PGOOD2 monitoring and ASIL B diagnostics for functional safety compliance. Use Value: 12µA quiescent current meets OEM sleep-mode leakage budgets; 24ns min on-time ensures stable 3.3V output during 6V cold-crank. |
Use Scenario: Supplies CPU, cellular modem, and GNSS receiver in vehicle telematics gateway with strict EMI limits and thermal constraints. IC Role / Device Role / Timing Role: Dual-phase configured MAX25255DAFDG/VY+ providing 16A at 1.1V with spread-spectrum clocking to pass CISPR 25 Class 5 radiated emissions. Use Value: ±10% current sharing accuracy and VEA-tied control loop eliminate need for external current-sense amplifiers, reducing BOM cost by $0.32. |
| Head-Unit Front-End Supply | ASIL B Domain Controller Auxiliary Rail |
|
Use Scenario: Generates 5V/12V auxiliary rails for infotainment head-unit display backlight, audio amplifier, and USB-C PD negotiation. IC Role / Device Role / Timing Role: Fixed-output variant operating in FPWM mode with 2MHz switching to minimize inductor size (<1.0mm height) in space-constrained dash layout. Use Value: Integrated 8A switches eliminate 4 external MOSFETs and drivers; 4.50mm × 5.75mm footprint saves 32mm² vs. discrete solution. |
Use Scenario: Provides safety-critical 3.3V rail for MCU watchdog, CAN transceiver, and ASIL B-compliant sensor interface in zonal domain controller. IC Role / Device Role / Timing Role: ASIL B-certified regulator with redundant reference and die-temp monitoring feeding dedicated safety island power domain. Use Value: Precision ±1% OV/UV thresholds and 6ms active timeout enable ISO 26262 FMEDA-compliant fault reaction within 10ms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX25254DAFDG/VY+ | No ASIL B diagnostics; lacks redundant reference, die-temp monitor, and programmable OV/UV thresholds. | Suitable for non-safety-critical dual-buck applications (e.g., body electronics) where cost sensitivity outweighs functional safety needs. | Select MAX25254DAFDG/VY+ only if ASIL B compliance is not required - identical pinout and electrical specs otherwise. |
| TPS65321C-Q1 | Single 3A buck + dual LDO; no multiphase capability; AEC-Q100 Grade 1 only (−40°C to +125°C ambient, not junction). | Targeted at MCU core supply in lower-power ASIL B systems; cannot replace 8A/channel requirement of MAX25255DAFDG/VY+. | Choose TPS65321C-Q1 only for mixed-rail (buck + LDO) applications below 3A; not a functional or pin-compatible alternative. |
Compared with MAX25254DAFDG/VY+, the MAX25255DAFDG/VY+ adds certified ASIL B diagnostics at identical cost and footprint - making it the mandatory choice for safety-critical rails. Against TPS65321C-Q1, it delivers 2.7× higher current per channel and true dual-buck multiphase scalability, but requires separate LDOs for auxiliary rails.
Availability
MAX25255DAFDG/VY+ is available at Aetrix Electronics and suitable for automotive front-camera systems, telematics modules, and ASIL B domain controllers requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 Grade 0 qualification.
Supply support for MAX25255DAFDG/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, and communications markets with safety-certified solutions.
The MAX25255DAFDG/VY+ belongs to Analog Devices' MAX25254/MAX25255 automotive power management family, designed specifically for ASIL B-compliant dual-buck conversion in ADAS, infotainment, and zonal ECU applications.
FAQ
What safety certifications does the MAX25255DAFDG/VY+ hold?
The MAX25255DAFDG/VY+ is ASIL B compliant per ISO 26262, with documented fault coverage for its redundant reference, die temperature monitor, and precision overvoltage/undervoltage protection circuits. It carries AEC-Q100 Grade 0 qualification (−40°C to +150°C junction) and is manufactured in IATF 16949-certified facilities. No additional third-party certification reports are required to claim ASIL B functionality - all diagnostics are implemented on-die and validated in the datasheet.
Can the MAX25255DAFDG/VY+ operate in single-channel mode?
Yes, the MAX25255DAFDG/VY+ supports independent channel control: EN1 and EN2 can be driven separately to enable only Buck1 or Buck2 while the other remains in shutdown (6.5µA quiescent current). Each channel retains full functionality - including PGOOD, soft-start, and current limiting - making it suitable for asymmetric rail generation (e.g., 5V + 1.8V) without external sequencing circuitry.
What is the purpose of the VEA pin on the MAX25255DAFDG/VY+?
On the MAX25255DAFDG/VY+, the VEA pin is the error amplifier output used exclusively for multiphase configurations. In dual-IC quad-phase operation, the VEA pins of primary and secondary ICs are tied together to force current sharing and extend the control-loop bandwidth across both devices. In single-IC operation, VEA must remain unconnected - floating - as it has no function and may cause instability if loaded.
Does the MAX25255DAFDG/VY+ support external frequency synchronization?
Yes, the MAX25255DAFDG/VY+ supports external clock synchronization via the SYNC pin. When an external clock (380–620kHz for 400kHz mode; 1.65–2.5MHz for 2MHz mode) is applied, Buck1 aligns its LX1 rising edge to the SYNC rising edge, and Buck2 operates 180° out of phase. Spread spectrum is automatically disabled during external sync, but any modulation present on the input clock passes through to the output.
How does the EXTVCC switchover function improve efficiency in the MAX25255DAFDG/VY+?
The EXTVCC switchover in the MAX25255DAFDG/VY+ reduces internal power dissipation by switching the BIAS LDO input from SUP1 to EXTVCC (e.g., a buck output rail) when VEXTVCC ≥ 2.5V. This lowers the LDO dropout voltage, cutting bias current consumption by >40% at light loads. Efficiency gain is most pronounced in always-on systems where the buck output powers EXTVCC - enabling longer battery runtime in telematics modules.
MAX25255DAFDG/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):
- 5V, 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 6A, 6A
- Frequency - Switching:
- 2MHz
- 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)
MAX25255DAFDG/VY+ FAQ
1.How can I place an order for MAX25255DAFDG/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25255DAFDG/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 MAX25255DAFDG/VY+ reliable?
The price and inventory of MAX25255DAFDG/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX25255DAFDG/VY+ is usually 5 days.
3.What payment methods are accepted for MAX25255DAFDG/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25255DAFDG/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25255DAFDG/VY+?
MAX25255DAFDG/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25255DAFDG/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 MAX25255DAFDG/VY+?
For technical support, including MAX25255DAFDG/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25255DAFDG/VY+ requirements.
6.How does Aetrix verify that MAX25255DAFDG/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX25255DAFDG/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 MAX25255DAFDG/VY+ meets industry standards.
7.What is the process for return or replacement of MAX25255DAFDG/VY+?
All MAX25255DAFDG/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX25255DAFDG/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 MAX25255DAFDG/VY+ part is unused and in its original packaging.
Return procedure for MAX25255DAFDG/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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