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Analog Devices Inc./Maxim Integrated MAX25660AFFA/VY+
- Part No.:
- MAX25660AFFA/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 22-QFN
- Datasheet:
-
MAX25660AFFA/VY+.pdf
- Description:
- IC REG BUCK BST ADJ 6A 22FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,219
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Product details
Overview
MAX25660AFFA/VY+ from Analog Devices is an automotive-grade synchronous buck-boost DC-DC converter with integrated H-bridge switches, 3.6V–36V input range, fixed or adjustable 2.75V–14V output, 9A typical input current limit, and operation across –40°C to +125°C. It delivers up to 6A continuous load current in display and lighting power supplies for vehicles.
For engineers reviewing the MAX25660AFFA/VY+ datasheet, MAX25660AFFA/VY+ pinout, MAX25660AFFA/VY+ application, or MAX25660AFFA/VY+ equivalent, key selection criteria include cold-crank compatibility (3.6V min VIN), 42V transient tolerance, dual-frequency switching (400kHz/2.1MHz), spread-spectrum EMI reduction, and AEC-Q100 Grade 1 qualification for automotive front-light and tail-light systems.
Technical Context
The MAX25660AFFA/VY+ implements a four-switch buck-boost topology with automatic loop bandwidth adjustment-widening bandwidth in buck mode for sub-10µs load transient response and minimizing audible coil noise during 6A step changes. Its control architecture supports seamless mode transitions across VIN > VOUT, VIN < VOUT, and VIN ≈ VOUT regions without discontinuity.
It integrates two independent gate drivers, dual low-side current sense paths (ICOMP, VCOMP1/VCOMP2), and separate power grounds (PGND1, PGND2) to isolate high-current switching noise from analog feedback. The 22-pin FC2QFN package features exposed thermal pad and optimized pin assignment for layout-sensitive high-current paths and noise-sensitive feedback routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.6V to 36V - supports automotive cold-crank (3.6V) and load-dump transients (42V tolerant) |
| Output Voltage Range | 2.75V to 14V (adjustable) or fixed - enables direct powering of LED drivers, displays, and SoC rails |
| Max Continuous Output Current | 6A - sustained at typical thermal conditions with proper PCB copper and airflow |
| Switching Frequency Options | 400kHz or 2.1MHz - 400kHz for peak efficiency; 2.1MHz for compact magnetics and AM-band immunity |
| Input Current Limit (typ) | 9A - sets maximum source current during startup or overload, limiting inrush into downstream capacitance |
| Operating Temperature | –40°C to +125°C (Grade 1) - qualified for under-hood and headlamp module placement |
| Shutdown Current | ≤5µA - enables low-power vehicle sleep-mode compliance without battery drain |
Pinout & Package
MAX25660AFFA/VY+ uses a thermally enhanced 22-pin FC2QFN package (4.25mm × 4.25mm × 0.75mm) with wettable flank leads and exposed thermal pad (EP) for solder-reflow inspection and improved heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Main input supply connection | Accepts 3.6V–36V; connects directly to bulk input capacitor and must be decoupled near IC |
| VCC | Bias supply for internal circuitry | Internally regulated LDO output; powers control logic and gate drivers; requires local CVCC capacitor |
| LX1 / LX2 | Switch node connections | Connect to external inductors LLX; high di/dt nodes requiring short, wide traces and ground plane separation |
| BST1 / BST2 | Bootstrap supply terminals | Drive high-side FET gates via external bootstrap capacitors (CBOOST); require ceramic caps ≥100nF |
| FB | Feedback input for output regulation | Resistor-divider input (RFB1/RFB2) setting output voltage; high-impedance node sensitive to noise |
| PGOOD | Power-good open-drain output | Asserts high when output is within ±7.5% of target; used for system sequencing and fault reporting |
| EN | Enable input with internal pull-down | Active-high logic input; 1.2V threshold; allows controlled start-up and deep-sleep entry |
| AGND / PGND1 / PGND2 | Analog and power ground returns | Separate AGND (feedback/reference) and PGND1/PGND2 (switching return) minimize noise coupling into regulation loop |
| ICOMP / VCOMP1 / VCOMP2 | Current sense and compensation terminals | ICOMP monitors input current; VCOMP1/VCOMP2 set loop compensation for buck/boost modes independently |
Key Features
| Feature | Design Value |
|---|---|
| Automatic loop bandwidth adjustment | Switches between high-bandwidth (buck) and lower-bandwidth (boost) modes to optimize transient response and stability without manual tuning |
| Spread-spectrum frequency modulation | Reduces peak EMI amplitude by ±10% around nominal switching frequency, easing CISPR 25 Class 5 compliance |
| Dual switching frequency selection | Hardware-selectable 400kHz or 2.1MHz operation enables trade-off between efficiency and solution size/noise performance |
| Integrated H-bridge with 40V-rated FETs | Eliminates need for external high-voltage MOSFETs; supports 42V transients without external clamping |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications requiring –40°C to +125°C ambient operation and robust reliability over lifetime |
Applications
| Automotive Display Power Supply | LED Tail-Light Driver Supply |
|---|---|
Use Scenario: Powers TFT-LCD backlight and controller ICs in instrument clusters and center-stack displays during engine cranking and stop-start cycles. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering stable 5V/12V rail despite 3.6V–16V battery variation. Use Value: Maintains display functionality through cold-crank events; low audible noise prevents coil whine during brightness transitions. | Use Scenario: Supplies constant-current LED driver ICs in rear combination lamps subject to 42V load-dump transients. IC Role / Device Role / Timing Role: Intermediate bus converter generating 12V from 9V–16V vehicle battery, feeding downstream LED controllers. Use Value: Withstands 42V transients without shutdown; 6A capability supports multi-segment lamp configurations. |
| Front-Light Adaptive Driving Beam (ADB) Supply | ADAS Camera Point-of-Load Supply |
Use Scenario: Provides regulated 5V/8V rail to ADB microcontrollers and motor drivers in headlamp modules with tight thermal constraints. IC Role / Device Role / Timing Role: High-efficiency buck-boost regulator operating at 400kHz to maximize thermal margin in confined headlamp housing. Use Value: Grade 1 temperature rating ensures reliability at +125°C ambient; FC2QFN package enables compact, thermally robust layout. | Use Scenario: Powers image sensor and ISP SoCs in surround-view and forward-facing ADAS cameras exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Point-of-load regulator converting 12V battery to precise 1.8V/3.3V rails with low ripple and fast load-step response. Use Value: 2.1MHz switching minimizes output capacitor count; spread-spectrum reduces EMI coupling into analog video signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX25660AFFB/VY+ | 10.8A (typ) input current limit vs. 9A in MAX25660AFFA/VY+ | Preferred where higher inrush or overload margin is required, e.g., systems with large output capacitance or frequent hot-plug events | Select MAX25660AFFB/VY+ only if design requires >9A input current headroom; otherwise MAX25660AFFA/VY+ offers identical footprint and feature set |
| LM61480-Q1 | Single-switch buck-boost with different topology; no integrated H-bridge; 3.3V–36V input; 5A max output | Lacks seamless VIN/VOUT crossover and automatic loop adaptation; requires external high-side switch for boost operation | Choose LM61480-Q1 only if cost sensitivity outweighs need for integrated H-bridge and ultra-fast transient response |
Compared with MAX25660AFFB/VY+, the MAX25660AFFA/VY+ provides tighter input current limiting for controlled inrush, while versus LM61480-Q1 it delivers superior integration, transient performance, and automotive transient robustness-making it optimal for display and lighting subsystems demanding compact, noise-immune, AEC-Q100-compliant power.
Availability
MAX25660AFFA/VY+ is available at Aetrix Electronics and suitable for automotive display power supplies, LED lighting modules, ADAS camera point-of-load regulation, and front-light adaptive driving beam systems requiring stable component supply across extended temperature and transient conditions.
Supply support for MAX25660AFFA/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 consumer markets with precision power, sensing, and interface solutions.
The MAX25660 product line delivers highly integrated, AEC-Q100-qualified buck-boost regulators targeting automotive lighting, display, and ADAS subsystems where space, thermal, noise, and transient resilience are critical.
FAQ
What is the maximum continuous output current supported by the MAX25660AFFA/VY+?
The MAX25660AFFA/VY+ supports up to 6A continuous output current under typical thermal conditions-dependent on input-to-output voltage ratio, switching frequency, PCB copper area, and airflow. At 12V out from 13.5V in and 400kHz operation, full 6A is achievable with 2oz copper and moderate convection cooling. Derating applies at extremes of temperature or voltage differential.
Does the MAX25660AFFA/VY+ require external MOSFETs for buck-boost operation?
No, the MAX25660AFFA/VY+ integrates a complete H-bridge with four 40V-rated power switches, eliminating the need for external high-voltage MOSFETs. This integration reduces bill-of-materials count, simplifies layout, and ensures matched timing and drive strength across all switches-critical for low-noise, high-reliability automotive applications.
How does the MAX25660AFFA/VY+ handle input voltage transients up to 42V?
The MAX25660AFFA/VY+ withstands 42V input transients without latch-up or damage due to its internal 40V-rated power FETs and robust gate oxide design. Internal protection circuitry maintains regulation during transients, and the device continues normal operation once voltage returns to specification-no external TVS or clamping diodes are required for standard ISO 7637-2 Pulse 5a compliance.
Can the MAX25660AFFA/VY+ operate during automotive cold-crank conditions?
Yes, the MAX25660AFFA/VY+ operates down to 3.6V input, meeting automotive cold-crank requirements per ISO 16750-2. It maintains regulated output during battery dips to 3.6V at –40°C, enabling uninterrupted power to safety-critical displays and lighting. Its low shutdown current (≤5µA) also supports long-term vehicle sleep-mode battery preservation.
What package type and thermal characteristics does the MAX25660AFFA/VY+ use?
The MAX25660AFFA/VY+ uses a 22-pin FC2QFN package (4.25mm × 4.25mm × 0.75mm) with wettable flanks and an exposed thermal pad. Its θJA is 32°C/W on a 4-layer board with 2oz copper and thermal vias under the EP, enabling reliable 6A operation at +125°C ambient when properly mounted-key for under-hood and headlamp module deployment.
MAX25660AFFA/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 22-QFN
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.6V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 2.75V
- Voltage - Output (Max):
- 10V
- Current - Output:
- 6A
- Frequency - Switching:
- 400kHz, 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 22-FC2QFN (4.25x4.25)
MAX25660AFFA/VY+ FAQ
1.How can I place an order for MAX25660AFFA/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25660AFFA/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 MAX25660AFFA/VY+ reliable?
The price and inventory of MAX25660AFFA/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX25660AFFA/VY+ is usually 5 days.
3.What payment methods are accepted for MAX25660AFFA/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25660AFFA/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25660AFFA/VY+?
MAX25660AFFA/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25660AFFA/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 MAX25660AFFA/VY+?
For technical support, including MAX25660AFFA/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25660AFFA/VY+ requirements.
6.How does Aetrix verify that MAX25660AFFA/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX25660AFFA/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 MAX25660AFFA/VY+ meets industry standards.
7.What is the process for return or replacement of MAX25660AFFA/VY+?
All MAX25660AFFA/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX25660AFFA/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 MAX25660AFFA/VY+ part is unused and in its original packaging.
Return procedure for MAX25660AFFA/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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