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Analog Devices Inc./Maxim Integrated MAX25277ATCA/VY+T
- Part No.:
- MAX25277ATCA/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
MAX25277ATCA/VY+T.pdf
- Description:
- IC REG BUCK PROG 2.5A 12TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,407
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Product details
Overview
MAX25277ATCA/VY+T from Analog Devices is a synchronous buck DC-DC converter with integrated high-side and low-side MOSFETs, delivering up to 2.5A output current across a 3.5V–36V input range while consuming only 3.5µA quiescent current at no load. It features fixed 5V/3.3V outputs or programmable 1V–10V regulation via external resistor divider, 2.1MHz switching frequency for compact magnetics, and AEC-Q100 qualification for automotive power rails.
For engineers reviewing the MAX25277ATCA/VY+T datasheet, MAX25277ATCA/VY+T pinout, MAX25277ATCA/VY+T application, or MAX25277ATCA/VY+T equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade operating parameters (−40°C to +125°C, 40V load-dump tolerance), and real-world EMI mitigation features including spread-spectrum modulation and FPWM/skip-mode control.
Technical Context
This device implements current-mode control with an internal error amplifier, slope compensation, and fixed-frequency PWM or pulse-skipping operation-selected via the SYNC pin. Its 20ns minimum on-time enables direct step-down from automotive battery to sub-3V rails without cascaded converters.
The architecture integrates a 5V bias LDO, bootstrap gate driver (BST–LX), open-drain PGOOD monitoring, and thermal shutdown at 175°C with 15°C hysteresis. Protection includes overcurrent limiting (3.5A typ), 40V transient tolerance, and dropout operation at 99% duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2.5A continuous - supports automotive infotainment, ADAS sensors, and industrial PLC I/O modules without external current boosting. |
| Input Voltage Range | 3.5V to 36V - accommodates cold-crank (≥3.0V post-startup) and load-dump (40V transient) conditions per ISO 7637-2. |
| Quiescent Current | 3.5µA at no load - extends battery life in always-on vehicle modules such as telematics and gateway ECUs. |
| Switching Frequency | 2.1MHz (fixed) - enables use of ≤2.2µH inductors and <10mm² total solution size, avoiding AM-band interference. |
| Output Accuracy | ±2% in FPWM mode (5V/3.3V) - ensures reliable logic-level supply for microcontrollers and CAN transceivers. |
| Operating Temperature | −40°C to +125°C junction - qualified to AEC-Q100 Grade 1, suitable for under-hood and engine-control applications. |
| Protection Features | 40V load-dump tolerance, overcurrent limit (3.5A), thermal shutdown (175°C), and PGOOD monitoring - reduces need for external supervision circuitry. |
Pinout & Package
MAX25277ATCA/VY+T is housed in a 3mm × 3mm, 12-pin side-wettable TDFN package (package code TD1233Y+2C) with exposed pad for thermal dissipation. The pinout is validated per Analog Devices' official pin configuration diagram (Rev 7, Aug 2022).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SPS | Spread-spectrum enable | Pull high to modulate switching frequency ±3% - reduces peak EMI emissions without external components. |
| 2 EN | High-voltage enable input | Logic-compatible from 3.3V to 40V - allows direct interface with automotive KEY or CAN inhibit signals. |
| 3 BST | Bootstrap supply for high-side FET gate | Requires 0.1µF ceramic capacitor to LX - sustains gate drive during 99% duty-cycle dropout operation. |
| 4 SUP | Main power input | Accepts 3.5V–36V; requires 4.7µF ceramic capacitor to PGND - filters high di/dt ripple from buck switching node. |
| 5 LX | Switching node | Connects to inductor; high-impedance when disabled - defines energy transfer path and sets minimum on-time (20ns). |
| 6 PGND | Power ground return | Separate low-impedance path for LX, OUT, and BST currents - prevents noise coupling into analog circuitry. |
| 7 AGND | Analog ground reference | Return for FB, SYNC, SPS, PGOOD, and internal bias - isolates sensitive feedback loop from switching noise. |
| 8 FB | Feedback voltage sense | 1.0V reference; connects to resistor divider for 1V–10V output or to BIAS for fixed 5V/3.3V - enables precise regulation. |
| 9 OUT | Regulated output | Bypassed with ≥30µF ceramic capacitance - supplies downstream loads while maintaining <2% output deviation. |
| 10 BIAS | Internal 5V bias rail | Supplies internal circuitry and can power external pullups (e.g., for PGOOD); requires 1µF ceramic to AGND. |
| 11 SYNC | Mode selection / synchronization input | Ground or open = skip mode; connect to BIAS = forced PWM - enables dynamic efficiency vs. EMI trade-off control. |
| 12 PGOOD | Open-drain power-good indicator | Asserts high when VOUT >93% nominal; pulls low at <92% - simplifies system power sequencing and fault detection. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck with integrated FETs | Eliminates external MOSFETs and drivers - reduces BOM count and PCB area by >30% versus discrete solutions. |
| 20ns minimum on-time | Enables direct 12V-to-1.8V conversion without pre-regulator - avoids complexity and losses of two-stage designs. |
| Pin-enabled spread-spectrum modulation | Reduces radiated EMI peaks by >10dB without altering layout or adding filters - meets CISPR 25 Class 5 requirements. |
| Fixed 3.5ms soft-start | Prevents inrush current and output overshoot during power-up - eliminates need for external soft-start timing components. |
| PGOOD and high-voltage EN inputs | Supports robust power sequencing in multi-rail systems - enables controlled startup/shutdown of microcontrollers and peripherals. |
| AEC-Q100 Grade 1 qualification | Validated for automotive environments - guarantees reliability across −40°C to +125°C ambient with full parametric testing. |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
|
Use Scenario: Powering SoC, display controller, and audio codec in head-unit systems with wide input voltage variation (cold crank to load dump). IC Role / Device Role / Timing Role: Primary 5V/3.3V buck regulator providing stable, low-noise supply with fast transient response and PGOOD sequencing. Use Value: 3.5µA quiescent current extends battery runtime in parked-state telematics; 40V tolerance prevents shutdown during alternator transients. |
Use Scenario: Generating clean 3.3V rail for CMOS image sensors and ISP processors in forward-facing cameras. IC Role / Device Role / Timing Role: Compact, high-efficiency DC-DC converter with tight output accuracy (±2%) and low output ripple. Use Value: 2.1MHz operation minimizes inductor size (<2.2µH), enabling integration into space-constrained camera housings. |
| Industrial PLC I/O Module | Automotive Gateway ECU |
|
Use Scenario: Providing isolated 5V supply for digital I/O conditioning circuits in harsh factory environments. IC Role / Device Role / Timing Role: Robust buck converter handling 36V industrial bus inputs and delivering regulated 5V with thermal protection. Use Value: −40°C to +125°C operation and 99% dropout capability ensure uninterrupted function during brownouts or high-ambient conditions. |
Use Scenario: Powering CAN FD transceivers, Ethernet PHYs, and MCU cores in vehicle communication gateways. IC Role / Device Role / Timing Role: Dual-mode (FPWM/skip) regulator balancing low-noise operation with ultra-low standby consumption. Use Value: Spread-spectrum modulation and 2.1MHz switching suppress EMI near sensitive CAN/Ethernet signal paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRTWRQ1 | 4.5V–36V input, 3.5A output, 2.1MHz, but lacks spread-spectrum and has higher IQ (12µA) | Preferred where higher output current is required; less suited for ultra-low-IQ always-on systems | Select LM61480QRTWRQ1 when >2.5A load current or tighter thermal margin is needed; verify EMI compliance without spread-spectrum. |
| TPS54560QDGQRQ1 | 3.5V–60V input, 5A output, 100kHz–2.5MHz adjustable freq, but IQ = 14µA and no AEC-Q100 Grade 1 rating | Used in heavy-duty industrial power supplies; not validated for automotive under-hood temperature extremes | Choose TPS54560QDGQRQ1 for wider VIN or higher current, but confirm thermal derating and qualification status for automotive deployment. |
Compared with LM61480QRTWRQ1 and TPS54560QDGQRQ1, MAX25277ATCA/VY+T offers superior ultra-low quiescent current (3.5µA), integrated spread-spectrum EMI reduction, and full AEC-Q100 Grade 1 validation - making it the optimal choice for automotive always-on subsystems requiring minimal standby loss and certified reliability.
Availability
MAX25277ATCA/VY+T is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, industrial PLC I/O, and gateway ECU designs requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for MAX25277ATCA/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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
MAX25277ATCA/VY+T belongs to the MAX20077/MAX25277 family of mini buck converters engineered specifically for automotive power systems demanding ultra-low IQ, wide input range, and AEC-Q100 qualification.
FAQ
What is the maximum output current supported by MAX25277ATCA/VY+T?
MAX25277ATCA/VY+T supports up to 2.5A continuous output current under typical operating conditions (TJ ≤ +125°C, 2.1MHz switching, proper thermal layout). This rating is validated across the full −40°C to +125°C junction temperature range and includes margin for peak transient loads in automotive applications.
Does MAX25277ATCA/VY+T support both fixed and adjustable output voltages?
Yes, MAX25277ATCA/VY+T supports fixed 5V or 3.3V outputs (by connecting FB to BIAS) and programmable 1V–10V outputs using an external resistor divider from OUT to FB to AGND. The feedback reference is precisely 1.0V (±1.5% accuracy), enabling accurate custom voltage setting.
How does the spread-spectrum feature work on MAX25277ATCA/VY+T?
When the SPS pin is pulled high, MAX25277ATCA/VY+T modulates its internal 2.1MHz oscillator frequency by ±3%, spreading spectral energy and reducing peak radiated EMI. This feature operates only in internally clocked mode and does not interfere with external SYNC clocking.
What protection features are integrated into MAX25277ATCA/VY+T?
MAX25277ATCA/VY+T integrates overcurrent limiting (3.5A typ), thermal shutdown (175°C), 40V load-dump tolerance, undervoltage lockout (2.73V typ), and PGOOD monitoring. These features eliminate the need for external protection circuitry in most automotive and industrial deployments.
Is MAX25277ATCA/VY+T pin-compatible with other variants in the MAX20077/MAX25277 family?
Yes, all MAX20077/MAX25277 variants-including MAX25277ATCA/VY+T-share identical 12-pin SWTDFN package (TD1233Y+2C), pinout, and footprint. Differences are limited to output current rating, switching frequency option (2.1MHz vs. 400kHz), and factory-trimmed output voltage, ensuring drop-in replacement within same variant group.
MAX25277ATCA/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 10V
- Current - Output:
- 2.5A
- 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:
- 12-TDFN (3x3)
MAX25277ATCA/VY+T FAQ
1.How can I place an order for MAX25277ATCA/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25277ATCA/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 MAX25277ATCA/VY+T reliable?
The price and inventory of MAX25277ATCA/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 MAX25277ATCA/VY+T is usually 5 days.
3.What payment methods are accepted for MAX25277ATCA/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25277ATCA/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25277ATCA/VY+T?
MAX25277ATCA/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25277ATCA/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 MAX25277ATCA/VY+T?
For technical support, including MAX25277ATCA/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25277ATCA/VY+T requirements.
6.How does Aetrix verify that MAX25277ATCA/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX25277ATCA/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 MAX25277ATCA/VY+T meets industry standards.
7.What is the process for return or replacement of MAX25277ATCA/VY+T?
All MAX25277ATCA/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX25277ATCA/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 MAX25277ATCA/VY+T part is unused and in its original packaging.
Return procedure for MAX25277ATCA/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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