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Analog Devices Inc./Maxim Integrated MAX25255DAFDA/VY+T
- Part No.:
- MAX25255DAFDA/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 23-PowerWFQFN
- Datasheet:
-
MAX25255DAFDA/VY+T.pdf
- Description:
- IC REG BCK 3.3V/3.3V DL 23FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,241
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Product details
Overview
MAX25255DAFDA/VY+T from Analog Devices is a dual-channel, automotive-grade synchronous buck converter IC with integrated 8A high-side/low-side MOSFETs per channel, 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 maintains regulation down to 99% duty cycle for automotive front-end power supplies such as head units and front camera modules.
For engineers reviewing the MAX25255DAFDA/VY+T datasheet, MAX25255DAFDA/VY+T pinout, MAX25255DAFDA/VY+T application, or MAX25255DAFDA/VY+T equivalent, key selection considerations include its AEC-Q100 qualification, ±1% output voltage accuracy in PWM mode, 24ns minimum on-time, 180° out-of-phase dual-channel operation, and support for quad-phase parallel configuration up to 32A with external synchronization.
Technical Context
The MAX25255DAFDA/VY+T implements two independent synchronous buck regulators sharing a common 4.50mm × 5.75mm 23-pin FC2QFN package, each with integrated 10mΩ high-side and 6mΩ low-side DMOS switches. Its MAXQ® power architecture enables precision transient response and stable phase margin across load and line variations.
It supports four fixed switching frequencies (200kHz/400kHz/1MHz/2MHz), spread-spectrum EMI reduction (±6%), and FPWM/skip-mode control via SYNC pin. The device features redundant reference circuitry, die temperature monitoring (TEMP pin), and programmable overvoltage/undervoltage thresholds compliant with ISO 26262 ASIL B requirements.
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; derated to 6A at 2MHz for thermal management. |
| Quiescent Current | 12µA typical with one channel enabled; enables always-on automotive systems with ultra-low standby power. |
| Output Voltage Accuracy | ±1% in PWM mode (–40°C to +125°C); ensures stable rail regulation for sensitive ADAS sensors and processors. |
| Switching Frequency Options | 200kHz / 400kHz / 1MHz / 2MHz; higher frequencies reduce external inductor/capacitor size but trade off efficiency. |
| ASIL Compliance | ASIL B certified (MAX25255 variant); includes redundant voltage reference, die temperature monitor, and precise OVP/UVP detection. |
| Minimum On-Time | 24ns typical; enables high step-down ratios (e.g., 12V→1.2V) without pulse skipping at light loads. |
| Thermal Shutdown | 175°C junction temperature with 15°C hysteresis; protects against sustained overload or poor PCB heatsinking. |
Pinout & Package
Package: 23-pin FC2QFN, 4.50mm × 5.75mm, exposed thermal pad (PGND pins 6, 9, 13). RoHS-compliant, AEC-Q100 qualified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SYNC) | Synchronization input | Configures FPWM (high) or skip mode (low); accepts external clock for frequency locking in multiphase systems. |
| 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 | Requires 0.1µF ceramic capacitor to LX; enables high-side gate drive above input rail for efficient synchronous rectification. |
| 4 (LX2), 11 (LX1) | Switch node outputs | Connect to external inductors; high-impedance when respective channel disabled; critical for EMI layout and thermal path. |
| 6 (PGND2), 9 (PGND1), 13 (PGND1) | Power ground terminals | Dedicated low-inductance paths for each buck stage; must be connected to thermal pad and ground plane with multiple vias. |
| 14 (SYNCOUT) | 90° out-of-phase clock output | Drives SYNC of secondary IC in quad-phase configuration; active only in FPWM mode; enables precise current sharing. |
| 15 (PGOOD1), 23 (PGOOD2) | Open-drain power-good indicators | Assert low during startup, undervoltage (<90–97.5%), or overvoltage (>102.5–110%); 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: use resistor divider to AGND for 0.8V–14V programming (FBx = 0.8V). |
| 17 (TEMP) | Die temperature monitor | Analog voltage output (0.75V @ 25°C, ~1V @ 125°C); used for thermal diagnostics and system-level thermal management. |
| 18 (VEA) | Error amplifier output | Shared between primary/secondary ICs in quad-phase operation to balance current and synchronize voltage regulation loops. |
| 20 (BIAS) | Internal 1.8V LDO output | Powers internal gate drivers; bypassed with ≥4.7µF ceramic capacitor; not intended for external loading. |
| 21 (EXTVCC) | Switchover input | Enables BIAS LDO sourcing from buck output instead of SUP1, reducing power dissipation and improving light-load efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 8A synchronous buck channels | Integrated 10mΩ/6mΩ HS/LS MOSFETs per channel eliminate external FETs and reduce BOM count for compact automotive power designs. |
| ASIL B safety architecture | Redundant reference, die temperature sensing, and ±1% OVP/UVP threshold accuracy meet ISO 26262 requirements for safety-critical subsystems. |
| Multiphase scalability | Supports dual-phase (16A) and quad-phase (32A) configurations using SYNCOUT-to-SYNC interconnect and shared VEA loop control. |
| Ultra-low quiescent current | 12µA typical with one channel active enables >10-year battery life in always-on telematics and infotainment modules. |
| Spread-spectrum EMI reduction | ±6% frequency modulation centered at fSW reduces peak radiated emissions without compromising regulation performance. |
| Dropout operation | 99% maximum duty cycle allows regulation even when VIN approaches VOUT, critical for cold-crank automotive conditions. |
Applications
| Front-End Power Supply for Head Units | ASIL-B Compliant Telematics Module |
|---|---|
Use Scenario: Powers SoC, display controller, and audio codec in automotive infotainment head units requiring stable 3.3V/5V/12V rails under wide input voltage swings (6V–16V battery). IC Role / Device Role / Timing Role: Dual-channel buck regulator delivering independent 5V@6A and 3.3V@4A outputs with PGOOD monitoring and thermal shutdown. Use Value: Eliminates need for discrete DC-DC stages; ASIL B diagnostics ensure safe failover during fault conditions per ISO 26262. |
Use Scenario: Supplies LTE modem, GNSS receiver, and CAN transceiver in vehicle-to-cloud communication modules operating in harsh thermal environments (–40°C to +105°C ambient). IC Role / Device Role / Timing Role: Primary power controller with die temperature monitoring (TEMP), redundant reference, and programmable OVP/UVP thresholds. Use Value: Enables single-chip compliance with ASIL B requirements-reducing validation effort and eliminating external safety monitors. |
| Front Camera Power System | General-Purpose Dual Buck Converter |
Use Scenario: Delivers clean, low-noise 1.2V core and 2.8V sensor bias rails to high-resolution automotive front cameras subject to EMI-sensitive image processing. IC Role / Device Role / Timing Role: Dual-phase configured buck providing 1.2V@4A and 2.8V@3A with 180° interleaving to halve input/output ripple current. Use Value: Spread-spectrum mode and 24ns min-on-time suppress switching noise near image sensor bandwidth, preserving SNR. |
Use Scenario: Replaces legacy discrete buck solutions in industrial HMIs, PLC I/O modules, and test equipment requiring dual regulated outputs with minimal external components. IC Role / Device Role / Timing Role: Compact, high-efficiency dual buck IC supporting adjustable outputs (0.8V–14V) and flexible frequency selection (200kHz–2MHz). Use Value: Reduces solution footprint by >40% vs. dual discrete converters while maintaining AEC-Q100 reliability for extended field life. |
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 |
|---|---|---|---|
| MAX25254DAFDA/VY+T | No ASIL B safety features; lacks redundant reference, die temp monitor, and programmable OVP/UVP thresholds. | Suitable for non-safety-critical automotive or industrial dual-buck applications where cost is prioritized over functional safety. | Select MAX25254DAFDA/VY+T only if ASIL B compliance is not required; identical pinout and electrical specs otherwise. |
| LM61480QRJNRQ1 | Single-channel 8A buck; no dual-channel integration, multiphase support, or ASIL B certification; lower quiescent current (15µA). | Requires two ICs to match dual-rail capability; lacks integrated TEMP/VEA/SYNCOUT for coordinated multiphase operation. | Choose LM61480QRJNRQ1 for simpler single-rail designs or when board space allows dual discrete layouts with separate control. |
Compared with MAX25255DAFDA/VY+T, the MAX25254DAFDA/VY+T offers identical performance without safety features-ideal for cost-sensitive non-ASIL designs-while the LM61480QRJNRQ1 provides higher efficiency per channel but requires duplication and external coordination for dual-rail functionality.
Availability
MAX25255DAFDA/VY+T is available at Aetrix Electronics and suitable for automotive front-end power supplies, ASIL-B telematics modules, and front camera power systems requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for MAX25255DAFDA/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 signal chain solutions.
The MAX25255DAFDA/VY+T belongs to Analog Devices' MAX25254/MAX25255 automotive power management family, designed specifically for ASIL B-compliant dual-buck applications in head units, ADAS cameras, and telematics systems demanding high reliability and functional safety.
FAQ
What is the ASIL B safety certification scope of the MAX25255DAFDA/VY+T?
The MAX25255DAFDA/VY+T is certified to ASIL B per ISO 26262, covering its integrated redundant voltage reference, die temperature monitoring (TEMP pin), and programmable overvoltage/undervoltage protection with ±1% threshold accuracy. These features enable diagnostic coverage for safety mechanisms in automotive power domains, and the device includes dedicated ASILB pin for safety state signaling. MAX25255DAFDA/VY+T does not cover full system-level ASIL B compliance-system integration and validation remain the responsibility of the end designer.
Can the MAX25255DAFDA/VY+T operate in dropout mode, and what is the minimum input-to-output voltage difference it supports?
Yes, the MAX25255DAFDA/VY+T supports dropout operation with up to 99.6% maximum duty cycle, enabling regulation when input voltage drops close to the output voltage-critical for automotive cold-crank conditions. It maintains regulation with VIN as low as VOUT + (VDS_ON × ILOAD)/η, typically supporting <300mV differential at light loads. This behavior is confirmed in the Electrical Characteristics table under "Maximum Duty Cycle" and validated across –40°C to +125°C ambient.
How does the EXTVCC pin improve efficiency in the MAX25255DAFDA/VY+T?
The EXTVCC pin allows the internal 1.8V BIAS LDO to switch its input source from SUP1 to an external supply (e.g., a buck output rail), reducing power dissipation in the LDO and improving light-load efficiency. When EXTVCC voltage exceeds 2.50V (typ), the switchover activates; if EXTVCC falls below 2.41V (typ), it reverts to SUP1. This feature lowers total IC supply current by scaling BIAS LDO input current with buck duty cycle-verified in the Electrical Characteristics table under "Supply Current" conditions.
What is the purpose of the VEA pin on the MAX25255DAFDA/VY+T, and how is it used in multiphase configurations?
The VEA (Error Amplifier Output) pin on the MAX25255DAFDA/VY+T provides access to the internal error amplifier output for current-sharing control in multiphase setups. In quad-phase operation, the VEA pins of primary and secondary ICs are tied together to force identical reference voltages and balanced current distribution. This ensures ±10% current sharing accuracy across up to 32A total output, as specified in the Benefits and Features section and validated in the Applications Information chapter.
Does the MAX25255DAFDA/VY+T support external clock synchronization, and what are the valid frequency ranges?
Yes, the MAX25255DAFDA/VY+T supports external clock synchronization via the SYNC pin. Valid input frequencies are 380–620kHz when configured for 400kHz internal switching, and 1.65–2.5MHz for 2MHz internal operation. The device locks its LX1 rising edge to the external SYNC rising edge and maintains 180° phase shift between channels. External synchronization disables internal spread-spectrum modulation but passes any modulation present on the external clock, as documented in the Detailed Description section.
MAX25255DAFDA/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:
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 23-FC2QFN (4.5x5.75)
MAX25255DAFDA/VY+T FAQ
1.How can I place an order for MAX25255DAFDA/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25255DAFDA/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 MAX25255DAFDA/VY+T reliable?
The price and inventory of MAX25255DAFDA/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 MAX25255DAFDA/VY+T is usually 5 days.
3.What payment methods are accepted for MAX25255DAFDA/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25255DAFDA/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25255DAFDA/VY+T?
MAX25255DAFDA/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25255DAFDA/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 MAX25255DAFDA/VY+T?
For technical support, including MAX25255DAFDA/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25255DAFDA/VY+T requirements.
6.How does Aetrix verify that MAX25255DAFDA/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX25255DAFDA/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 MAX25255DAFDA/VY+T meets industry standards.
7.What is the process for return or replacement of MAX25255DAFDA/VY+T?
All MAX25255DAFDA/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX25255DAFDA/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 MAX25255DAFDA/VY+T part is unused and in its original packaging.
Return procedure for MAX25255DAFDA/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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