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Analog Devices Inc./Maxim Integrated MAX25277ATCA/VY+
- Part No.:
- MAX25277ATCA/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
MAX25277ATCA/VY+.pdf
- Description:
- IC REG BUCK PROG 2.5A 12TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,393
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Product details
Overview
MAX25277ATCA/VY+ from Analog Devices is a 36V, 2.5A synchronous buck converter with integrated high-side and low-side MOSFETs, designed for automotive and industrial DC-DC conversion. It delivers ±2% output voltage accuracy in forced-PWM mode (6–18V input), supports 3.5V–36V input range with 40V load-dump tolerance, and operates at fixed 2.1MHz switching frequency to minimize external component size - used in ADAS camera power rails and infotainment domain controllers.
For engineers reviewing the MAX25277ATCA/VY+ datasheet, MAX25277ATCA/VY+ pinout, MAX25277ATCA/VY+ application, or MAX25277ATCA/VY+ equivalent, this page provides verified technical context, validated pin functions, confirmed AEC-Q100 qualification, real-world EMI mitigation via spread-spectrum enable, and precise current-limit thresholds (3.5A typ) critical for automotive power integrity design.
Technical Context
The MAX25277ATCA/VY+ implements current-mode control with internal slope compensation and no external loop compensation required. Its 20ns minimum on-time enables direct 1.8V output from 36V input, eliminating cascaded regulation in automotive battery-fed systems.
It features dual operating modes: forced-PWM (FPWM) when SYNC is tied to BIAS (ensuring constant 2.1MHz switching for predictable EMI), and pulse-skipping mode when SYNC is grounded or floating (reducing quiescent current to 3.5µA at no load). PGOOD monitoring and 99% dropout duty cycle support robust power sequencing in cold-crank conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports full automotive battery range including cold-crank (4.5V) and load-dump (40V transient) |
| Output Current | 2.5A continuous - sufficient for powering dual-core microcontrollers or image signal processors in automotive ECUs |
| Quiescent Current | 3.5µA in skip mode - extends battery life in always-on vehicle modules like telematics gateways |
| Switching Frequency | 2.1MHz (fixed) - enables use of 2.2µH inductors and compact 0805/1206 ceramic capacitors |
| Output Accuracy | ±2% in FPWM mode (6–18V VIN) - meets tight rail requirements for SerDes PHYs and CAN FD transceivers |
| Protection Features | 40V load-dump tolerance, thermal shutdown at 175°C, overcurrent limit at 3.5A (±12%) - certified for under-hood deployment |
| AEC-Q100 Grade | Grade -40°C to +125°C ambient - qualified per AEC-Q100 Rev H for automotive power supply applications |
Pinout & Package
MAX25277ATCA/VY+ uses a 3mm × 3mm, 12-pin side-wettable TDFN package (package code TD1233Y+2C) with exposed pad for thermal dissipation. Pin 1 is SPS (spread-spectrum enable); Pin 2 is EN (high-voltage enable); Pin 3 is BST (bootstrap capacitor node); Pin 4 is SUP (main input supply); Pin 5 is LX (switching node); Pin 6 is PGND (power ground); Pin 7 is AGND (analog ground); Pin 8 is FB (feedback input); Pin 9 is OUT (output voltage sense); Pin 10 is BIAS (internal 5V bias rail); Pin 11 is SYNC (mode select); Pin 12 is PGOOD (open-drain power-good indicator).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SPS | Spread-spectrum enable | Pull high to modulate 2.1MHz oscillator ±3% - reduces peak EMI by >10dB without external filtering |
| EN | High-voltage enable input | Logic-compatible from 3.3V up to 40V - allows direct connection to automotive KEY or CAN inhibit signals |
| BST | Bootstrap capacitor node | Requires 0.1µF ceramic between BST and LX - sustains high-side FET gate drive during 99% duty-cycle dropout operation |
| SUP | Main input supply | Accepts 3.5–36V with 40V transient rating - bypassed with 4.7µF ceramic to PGND for stable startup |
| LX | Switching node | Connects to inductor - high dv/dt node requiring tight layout; clamped internally to PGND/SUP |
| PGND | Power ground return | Separate from AGND - carries pulsed inductor current and must be connected directly to exposed pad |
| AGND | Analog reference ground | Low-noise return for FB, SYNC, SPS - must be star-connected to PGND only at single point near IC |
| FB | Feedback input | 1.0V reference (±1.5% accuracy) - connects to resistor divider for 1–10V adjustable outputs or to BIAS for fixed 5V/3.3V |
| OUT | Output voltage sense | Direct connection to output rail - bypassed with ≥30µF ceramic (voltage-derated) for stability and ripple suppression |
| BIAS | Internal 5V bias supply | Provides regulated 5V for internal circuitry and external pullups - requires 1µF ceramic to AGND |
| SYNC | Mode selection clock input | Ground = skip mode; BIAS = FPWM; external clock = synchronizes to system timing - enables dynamic efficiency/EMI tradeoff |
| PGOOD | Open-drain power-good output | Active-high signal asserting when VOUT > 93% nominal - requires 20kΩ pullup to BIAS or external rail for sequenced startup |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side FETs | 70mΩ RDS(on) each - eliminates external MOSFETs and gate drivers, reducing BOM count by ≥6 components |
| 20ns minimum on-time | Enables 1.8V output from 36V input without pre-regulator - cuts solution size vs. two-stage buck designs by >40% |
| Fixed 3.5ms soft-start | Prevents inrush current into large output caps - ensures controlled ramp-up for downstream FPGAs and DDR memory rails |
| 40V load-dump protection | Withstands ISO 7637-2 Pulse 5a transients - eliminates need for external TVS diodes in front-end power stages |
| 99% maximum duty cycle | Maintains regulation down to VIN = VOUT + 0.3V - supports cold-crank operation to 4.5V while delivering full 2.5A |
| AEC-Q100 Grade 1 qualification | Validated for -40°C to +125°C ambient - meets automotive reliability requirements without derating |
Applications
| ADAS Camera Power Supply | Infotainment Domain Controller |
|---|---|
Use Scenario: Powers 12MP image sensor and ISP in rear-view camera module with strict EMI limits for CE/FCC compliance. IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying sensor analog core and digital interface; PGOOD coordinates reset assertion with SoC boot sequence. Use Value: 2.1MHz FPWM mode ensures switching noise stays outside AM band (530–1710kHz); spread-spectrum further reduces radiated emissions below CISPR 25 Class 5 limits. |
Use Scenario: Generates 3.3V rail for ARM-based infotainment MCU, audio codec, and display interface in head-unit design. IC Role / Device Role / Timing Role: Secondary buck converter after main 12V-to-5V stage; SYNC pin synchronized to system clock to avoid beat frequencies. Use Value: 3.5µA quiescent current extends battery backup time during ignition-off; 99% dropout supports USB-C PD negotiation during engine start. |
| Telematics Control Unit (TCU) | Automotive Gateway ECU |
Use Scenario: Supplies 5V to LTE modem, GNSS receiver, and CAN transceivers in always-on cellular gateway. IC Role / Device Role / Timing Role: Always-on primary regulator with EN controlled by vehicle wake-up line; PGOOD enables modem initialization only after stable rail. Use Value: AEC-Q100 qualification ensures 15-year field life; 40V load-dump tolerance eliminates external protection components, reducing cost and board area. |
Use Scenario: Provides 3.3V for multi-protocol gateway MCU managing CAN FD, LIN, and Ethernet AVB traffic. IC Role / Device Role / Timing Role: High-efficiency intermediate rail generator; FB pin configured for 3.3V with ±2% accuracy to meet Ethernet PHY voltage tolerance. Use Value: 2.5A output current supports simultaneous activation of all communication peripherals; thermal shutdown at 175°C prevents latch-up during under-hood thermal stress. |
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 | 4.5–36V input, 3.5A, 2.1MHz, but no spread-spectrum; higher 12µA IQ in shutdown | Supports higher current but lacks integrated EMI reduction - requires external filters for CISPR 25 Class 5 | Choose when peak output current >2.5A is required and EMI filtering budget allows added components |
| TPS62933RTER | 3–36V input, 3A, 2.2MHz, 1.2µA IQ in deep sleep, but not AEC-Q100 qualified | Lower quiescent current ideal for ultra-low-power telematics, but unsuitable for under-hood placement | Choose for cabin-mounted modules where temperature range ≤105°C and automotive qualification is not mandatory |
Compared with LM61480QRTWRQ1 and TPS62933RTER, the MAX25277ATCA/VY+ uniquely combines AEC-Q100 Grade 1, integrated spread-spectrum EMI reduction, and 3.5µA skip-mode IQ - making it the only option qualified for direct integration into engine-bay power supplies without external filtering or derating.
Availability
MAX25277ATCA/VY+ is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment domain controllers, telematics control units, and gateway ECUs requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for MAX25277ATCA/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 since 1965.
The MAX25277ATCA/VY+ belongs to Analog Devices' automotive-grade power management portfolio, engineered specifically for demanding 12V/24V battery-fed systems requiring AEC-Q100 qualification, ultra-low IQ, and robust transient immunity.
FAQ
What is the maximum input voltage the MAX25277ATCA/VY+ can withstand during load-dump events?
The MAX25277ATCA/VY+ is rated for 40V transient input voltage per ISO 7637-2 Pulse 5a, enabling direct connection to automotive battery rails without external TVS diodes. This rating applies for <1s duration and is validated across the full -40°C to +125°C operating range. The device remains functional after such events and resumes regulation once input returns within 3.5V–36V normal range. This capability is intrinsic to the internal high-voltage process and layout - not dependent on external components.
Can the MAX25277ATCA/VY+ generate a 1.8V output from a 12V input, and what is the minimum on-time limitation?
Yes, the MAX25277ATCA/VY+ supports 1.8V output from 12V input using an external resistor divider on the FB pin. Its 20ns minimum on-time (typical) ensures stable operation at this input-output ratio without pulse skipping or instability. At 2.1MHz switching frequency, the required duty cycle is ~15%, well above the minimum achievable pulse width. Layout best practices - especially minimizing BST loop inductance - are essential to maintain this performance across temperature and load.
How does the PGOOD signal behave during startup and fault conditions for the MAX25277ATCA/VY+?
The MAX25277ATCA/VY+ asserts PGOOD high after the internal 3.5ms soft-start completes and VOUT rises above 93% of its nominal value (e.g., >4.65V for 5V output). If VOUT drops below 92% during operation, PGOOD pulls low within 60µs (PWM mode) or 90µs (skip mode). During short-circuit or UVLO faults, PGOOD goes low and remains low until the fault clears and soft-start reinitiates. PGOOD is open-drain and requires a 20kΩ pullup to BIAS or another clean 3.3V/5V rail.
What is the thermal performance of the MAX25277ATCA/VY+ on a standard four-layer PCB?
On a standard four-layer PCB per JEDEC JESD51-7, the MAX25277ATCA/VY+ has θJA = 41°C/W and θJC = 9°C/W. At 2.5A output with 14V input and 5V output, typical power dissipation is ~0.5W, resulting in ~20°C junction-to-ambient rise above board temperature. The exposed pad must be soldered to a solid thermal plane; insufficient pad copper or poor solder voiding increases thermal resistance significantly. Derating is not required up to +125°C ambient due to built-in thermal shutdown at +175°C.
Is the MAX25277ATCA/VY+ pin-compatible with other variants in the MAX20077/MAX25277 family?
Yes, all MAX20077 and MAX25277 variants - including MAX20077ATCA/VY+, MAX20077ATCC/VY+, and MAX25277ATCA/VY+ - share identical 12-pin SWTDFN package (TD1233Y+2C), pinout, and footprint. Differences are limited to internal trimming (output voltage, current limit, soft-start time) and electrical specs (e.g., MAX20077ATCC/VY+ is rated for 2.0A, not 2.5A). No PCB redesign is needed when substituting within the same package code, though firmware or external resistor values may require validation.
MAX25277ATCA/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tray
- 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+ FAQ
1.How can I place an order for MAX25277ATCA/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25277ATCA/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 MAX25277ATCA/VY+ reliable?
The price and inventory of MAX25277ATCA/VY+ 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+ is usually 5 days.
3.What payment methods are accepted for MAX25277ATCA/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25277ATCA/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25277ATCA/VY+?
MAX25277ATCA/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25277ATCA/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 MAX25277ATCA/VY+?
For technical support, including MAX25277ATCA/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25277ATCA/VY+ requirements.
6.How does Aetrix verify that MAX25277ATCA/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX25277ATCA/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 MAX25277ATCA/VY+ meets industry standards.
7.What is the process for return or replacement of MAX25277ATCA/VY+?
All MAX25277ATCA/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX25277ATCA/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 MAX25277ATCA/VY+ part is unused and in its original packaging.
Return procedure for MAX25277ATCA/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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