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Analog Devices Inc./Maxim Integrated MAX25277ATCB/VY+
- Part No.:
- MAX25277ATCB/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
MAX25277ATCB/VY+.pdf
- Description:
- IC REG BUCK PROG 2.5A 12TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,787
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Product details
Overview
MAX25277ATCB/VY+ from Analog Devices is a synchronous buck DC-DC converter with integrated high-side and low-side MOSFETs, delivering up to 2.0A output current across a 3.5V–36V input range while consuming only 3.5µA quiescent current at no load. It provides fixed 3.3V output with ±2% accuracy in forced-PWM mode, supports 99% duty-cycle dropout operation, and features 20ns minimum on-time for high step-down ratios - ideal for automotive body control modules requiring robust 12V/24V battery rail regulation.
For engineers reviewing the MAX25277ATCB/VY+ datasheet, MAX25277ATCB/VY+ pinout, MAX25277ATCB/VY+ application, or MAX25277ATCB/VY+ equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade specifications (AEC-Q100, -40°C to +125°C), and real-world EMI mitigation features including spread-spectrum modulation and 2.1MHz/400kHz selectable switching frequency.
Technical Context
The MAX25277ATCB/VY+ employs current-mode control architecture with internal slope compensation, enabling stable regulation without external compensation components. Its 20ns minimum on-time and 99% maximum duty cycle support direct conversion from automotive battery rails (e.g., 36V down to 3.3V) and seamless dropout operation during cold-crank transients.
It integrates dual FETs with 70mΩ typical RDS(on) for both high-side and low-side switches, operates in either forced-PWM (FPWM) or pulse-skipping mode via SYNC pin configuration, and includes PGOOD monitoring, thermal shutdown at 175°C, and 40V load-dump protection - all within an AEC-Q100 qualified design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2.0A continuous - sufficient for powering microcontrollers, CAN transceivers, and sensor interfaces in automotive ECUs |
| Input Voltage Range | 3.5V to 36V - covers full automotive battery range including cold-crank (≈4.5V) and load-dump (up to 40V transient) |
| Quiescent Current | 3.5µA at no load - enables always-on functionality in vehicle infotainment and telematics without battery drain |
| Output Voltage Accuracy | ±2% in FPWM mode (3.3V variant) - ensures reliable logic-level compliance for 3.3V I/O domains |
| Switching Frequency | 2.1MHz (typical) - allows use of compact 2.2µH inductors and reduces EMI in AM band-sensitive applications |
| Minimum On-Time | 20ns - enables direct 36V-to-3.3V conversion without intermediate stages, reducing BOM count and board space |
| Operating Temperature | -40°C to +125°C ambient - meets automotive under-hood thermal requirements per AEC-Q100 Grade 1 |
Pinout & Package
MAX25277ATCB/VY+ uses a 3mm × 3mm, 12-pin side-wettable TDFN package (package code TD1233Y+2C) with exposed pad for enhanced thermal dissipation in high-power-density automotive layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SPS | Spread-spectrum enable | Logic-high activates ±3% frequency modulation to reduce peak EMI emissions; internal 1MΩ pulldown ensures default disable |
| 2 EN | High-voltage enable input | Accepts 3.3V–36V logic; enables device startup and supports KEY/CAN inhibit sequencing in automotive power trees |
| 3 BST | Bootstrap supply for high-side gate driver | Requires 0.1µF ceramic capacitor to LX; sustains >99% duty cycle operation during dropout conditions |
| 4 SUP | Main power input | 3.5V–36V supply rail; requires 4.7µF ceramic decoupling to PGND for stable switching and UVLO immunity |
| 5 LX | Switch node | Connects to inductor; high dv/dt node requiring tight layout to minimize EMI; clamped internally to PGND/SUP |
| 6 PGND | Power ground | Return path for high-current switching loops; must be separated from AGND to prevent noise coupling into feedback |
| 7 AGND | Analog ground | Reference for FB, PGOOD, and internal bias circuitry; connects to clean ground plane near BIAS and FB pins |
| 8 FB | Feedback input | 1.0V reference point; tied to BIAS for fixed 3.3V output or configured with resistor divider for 1V–10V programmable outputs |
| 9 OUT | Regulated output | 3.3V output node; bypassed with ≥44µF effective capacitance (voltage-derated) for stability and ripple suppression |
| 10 BIAS | Internal 5V bias supply | Provides regulated 5V for internal circuitry and FB reference; requires 1µF ceramic cap to AGND |
| 11 SYNC | Mode selection clock input | Ground or open = skip mode (high efficiency at light loads); tied to BIAS = FPWM mode (fixed 2.1MHz, low EMI) |
| 12 PGOOD | Open-drain power-good indicator | Active-high signal asserting when VOUT is within 92–95% of nominal; requires external 20kΩ pullup for system power sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck with integrated FETs | Eliminates need for external MOSFETs and drivers, reducing solution size by >40% versus discrete controllers |
| AEC-Q100 qualified | Validated for automotive applications including engine bay and passenger compartment environments |
| 40V load-dump protection | Withstands ISO 7637-2 Pulse 5a transients without external TVS, simplifying front-end protection design |
| Fixed 3.5ms soft-start | Prevents inrush current during power-up; includes 7ms fault recovery timeout for short-circuit resilience |
| Spread-spectrum modulation | Reduces radiated EMI peaks by >10dB without altering PCB layout or adding shielding |
| Current-mode control | Enables fast transient response (<10µs recovery from 1A load step) and inherent cycle-by-cycle current limiting |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power Supply |
|---|---|
Use Scenario: Regulating 12V battery input to stable 3.3V for MCU, CAN transceiver, and LIN interface in door module. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, sequenced 3.3V rail with PGOOD signaling for safe MCU boot. Use Value: 3.5µA quiescent current prevents battery drain during vehicle sleep mode; 99% duty cycle maintains regulation during 6V cold-crank. |
Use Scenario: Generating 3.3V from 24V industrial bus to power field-programmable gate array (FPGA) configuration memory and sensors. IC Role / Device Role / Timing Role: High-efficiency, wide-input DC-DC converter with thermal shutdown protecting against enclosure overheating. Use Value: 40V transient tolerance eliminates need for upstream TVS; AEC-Q100 qualification ensures reliability in harsh factory environments. |
| Automotive ADAS Camera Power | Smart Sensor Node Regulator |
Use Scenario: Supplying 3.3V to image sensor and ISP in rear-view camera exposed to under-bumper temperature extremes. IC Role / Device Role / Timing Role: Automotive-grade buck converter with -40°C to +125°C operation and PGOOD monitoring for fail-safe imaging. Use Value: 20ns minimum on-time enables single-stage 12V→3.3V conversion, avoiding complexity and cost of cascaded regulators. |
Use Scenario: Powering ultra-low-power IoT sensor nodes (e.g., pressure, temperature) from 12V vehicle battery or 24V industrial supply. IC Role / Device Role / Timing Role: Always-on regulator with standby IQ < 4µA, supporting multi-year battery life in wireless telemetry applications. Use Value: Skip-mode operation automatically engages below 600mA load, maintaining >85% efficiency at 100µA output current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20077ATCB/VY+ | Same pinout, same 3.3V fixed output, but rated for 2.5A and uses 65ns min on-time | Higher current capability suits heavier loads (e.g., multi-sensor clusters); less suitable for space-constrained 2.0A designs | Select when >2.0A peak load or higher thermal margin is required; verify layout compatibility with larger current paths |
| LM61480QWRNRQ1 | 4.5V–36V input, 3.3V fixed, 3.5A output; 1.5MHz switching; no spread spectrum; different pinout | Lacks SPS pin and FPWM/skip mode flexibility; requires external compensation; higher IQ (12µA) | Choose for higher current headroom and TI ecosystem support; re-layout required due to non-pin-compatible 16-pin WQFN |
Compared with MAX25277ATCB/VY+, the MAX20077ATCB/VY+ offers higher current but reduced miniaturization benefit, while the LM61480QWRNRQ1 trades EMI control and layout simplicity for raw output capability - making MAX25277ATCB/VY+ optimal for compact, EMI-sensitive automotive modules needing precise 2.0A delivery.
Availability
MAX25277ATCB/VY+ is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O power supplies, and ADAS camera subsystems requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle assurance.
Supply support for MAX25277ATCB/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 with precision power, sensing, and timing solutions.
The MAX25277ATCB/VY+ belongs to Analog Devices' automotive-qualified mini-buck converter family, designed specifically for space-constrained, thermally demanding vehicle subsystems requiring ultra-low IQ, wide VIN, and robust transient immunity.
FAQ
What is the output voltage configuration of the MAX25277ATCB/VY+?
The MAX25277ATCB/VY+ is factory-trimmed for fixed 3.3V output. To use this setting, connect the FB pin directly to the BIAS pin. No external resistor divider is needed. This configuration delivers ±2% output accuracy in forced-PWM mode across the 6V–18V input range, and remains stable under automotive temperature extremes (-40°C to +125°C). The MAX25277ATCB/VY+ does not support adjustable output voltages - for programmable 1V–10V operation, select MAX20077ATCA/VY+ or other variants with external feedback capability.
Does the MAX25277ATCB/VY+ support forced-PWM (FPWM) mode, and how is it enabled?
Yes, the MAX25277ATCB/VY+ supports forced-PWM mode to ensure constant switching frequency and improved EMI performance. FPWM is enabled by connecting the SYNC pin to the BIAS pin (5V internal supply). When SYNC is pulled high to BIAS, the device operates at its nominal 2.1MHz switching frequency regardless of load, eliminating frequency variation seen in skip mode. This behavior is confirmed in the Electrical Characteristics table and Detailed Description section of the MAX25277ATCB/VY+ datasheet.
What is the minimum recommended output capacitance for the MAX25277ATCB/VY+?
The MAX25277ATCB/VY+ requires a minimum of 44µF effective output capacitance (after voltage derating) for stable operation with the 3.3V fixed output. This value is specified in Table 2 of the Applications Information section and accounts for ESL, ESR, and DC bias effects of ceramic capacitors. Using less than 44µF may cause instability or excessive output ripple, especially under dynamic load steps. For best transient response, place low-ESR X7R/X5R ceramics close to the OUT and PGND pins.
How does the MAX25277ATCB/VY+ handle automotive load-dump transients?
The MAX25277ATCB/VY+ withstands 40V load-dump transients per ISO 7637-2 Pulse 5a without external protection components. Its absolute maximum rating for SUP is +40V, and internal circuitry remains functional during these events. During a 40V transient, the device continues regulating if input stays within operational limits, and thermal protection prevents damage. This eliminates the need for external TVS diodes in many automotive front-end designs, reducing BOM cost and board area - a key advantage confirmed in the Absolute Maximum Ratings and Applications sections.
Is the MAX25277ATCB/VY+ pin-compatible with other devices in the MAX20077/MAX25277 family?
The MAX25277ATCB/VY+ shares the identical 12-pin side-wettable TDFN package (TD1233Y+2C) and pinout with MAX20077ATCB/VY+, MAX20077ATCC/VY+, and other members of the family. All variants use the same PCB footprint, thermal pad connection, and signal assignments - enabling drop-in replacement for design reuse. However, electrical differences exist: MAX25277ATCB/VY+ is optimized for 3.3V/2.0A with 20ns min on-time, while MAX20077ATCB/VY+ supports 2.5A and 65ns min on-time. Always verify current, thermal, and timing requirements before substitution.
MAX25277ATCB/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)
MAX25277ATCB/VY+ FAQ
1.How can I place an order for MAX25277ATCB/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25277ATCB/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 MAX25277ATCB/VY+ reliable?
The price and inventory of MAX25277ATCB/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX25277ATCB/VY+ is usually 5 days.
3.What payment methods are accepted for MAX25277ATCB/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25277ATCB/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25277ATCB/VY+?
MAX25277ATCB/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25277ATCB/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 MAX25277ATCB/VY+?
For technical support, including MAX25277ATCB/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25277ATCB/VY+ requirements.
6.How does Aetrix verify that MAX25277ATCB/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX25277ATCB/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 MAX25277ATCB/VY+ meets industry standards.
7.What is the process for return or replacement of MAX25277ATCB/VY+?
All MAX25277ATCB/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX25277ATCB/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 MAX25277ATCB/VY+ part is unused and in its original packaging.
Return procedure for MAX25277ATCB/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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