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Analog Devices Inc./Maxim Integrated MAX25277ATCB/VY+T
- Part No.:
- MAX25277ATCB/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
MAX25277ATCB/VY+T.pdf
- Description:
- IC REG BUCK PROG 2.5A 12TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,421
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Product details
Overview
MAX25277ATCB/VY+T 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 3.5V–36V input range while consuming only 3.5µA quiescent current at no load. It features fixed 3.3V output (±2% accuracy in FPWM mode), 2.1MHz switching frequency, 65ns minimum on-time, and AEC-Q100 qualification for automotive power rails.
For engineers reviewing the MAX25277ATCB/VY+T datasheet, MAX25277ATCB/VY+T pinout, MAX25277ATCB/VY+T application, or MAX25277ATCB/VY+T equivalent, this page delivers verified electrical specs, validated pin functions, confirmed automotive-grade thermal and protection behavior, and real-world design implications of its 99% dropout operation and spread-spectrum EMI reduction.
Technical Context
The MAX25277ATCB/VY+T implements current-mode control with internal slope compensation and a fixed 2.1MHz oscillator, enabling stable regulation down to 3.3V output directly from automotive battery transients. Its 65ns minimum on-time supports high input-to-output voltage ratios without pulse-skipping instability in FPWM mode.
It integrates a 5V bias LDO, PGOOD monitoring with 92–94% threshold hysteresis, and robust protection including 40V load-dump tolerance, thermal shutdown at 175°C, and peak current limiting at 2.9A (±12%). The device enters skip mode automatically when SYNC is grounded or floating, reducing IQ to 3.5µA under light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2.0A continuous - supports automotive infotainment and ADAS subsystems without external current boosting. |
| Input Voltage Range | 3.5V to 36V - accommodates cold-crank (≥3.0V post-startup) and 40V load-dump transients per ISO 7637-2. |
| Fixed Output Voltage | 3.3V ±2% in FPWM mode - meets I/O rail requirements for microcontrollers and CAN transceivers. |
| Switching Frequency | 2.1MHz (typ) - enables use of compact 2.2µH inductors and reduces EMI in AM band (0.53–1.71MHz). |
| Quiescent Current | 3.5µA at no load - extends battery life in always-on vehicle modules such as telematics and alarm systems. |
| Minimum On-Time | 65ns - allows direct 3.3V regulation from 24V nominal input without intermediate conversion stages. |
| Thermal Protection | 175°C shutdown with 15°C hysteresis - ensures safe operation under sustained high ambient + load conditions. |
Pinout & Package
MAX25277ATCB/VY+T is housed in a 3mm × 3mm, 12-pin side-wettable TDFN package (TD1233Y+2C) with exposed pad for thermal dissipation. The package supports automated optical inspection (AOI) and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SPS | Spread-spectrum enable | Logic-high enables ±3% frequency modulation to reduce peak EMI emissions; internal 1MΩ pulldown ensures default disable. |
| 2 EN | High-voltage enable input | Accepts 0–40V logic; enables device when >2.4V; no internal pullup/pulldown preserves ultra-low IQ. |
| 3 BST | Bootstrap supply for high-side gate driver | Requires 0.1µF ceramic capacitor to LX; sustains gate drive during 99% duty-cycle dropout operation. |
| 4 SUP | Main power input | 3.5–36V supply input; requires 4.7µF ceramic capacitor to PGND for transient suppression. |
| 5 LX | Switch node | Connects to inductor; high-impedance when disabled; clamped internally to PGND/SUP during fault conditions. |
| 6 PGND | Power ground | Return path for high-current switching paths; must be separated from AGND to minimize noise coupling. |
| 7 AGND | Analog ground | Reference for FB, PGOOD, and internal error amplifier; connects to system analog ground plane. |
| 8 FB | Feedback input | 1.0V reference point; tied to BIAS for fixed 3.3V output; supports resistor-divider for 1–10V programmable outputs. |
| 9 OUT | Regulated output | 3.3V output node; bypassed with ≥30µF effective capacitance (voltage-derated) for stability and ripple control. |
| 10 BIAS | Internal 5V bias supply | Provides gate drive and internal circuitry power; requires ≥1µF ceramic capacitor to AGND. |
| 11 SYNC | Synchronization/operation mode select | Ground or open = skip mode; connected to BIAS = forced PWM; internal 1MΩ pulldown sets default skip mode. |
| 12 PGOOD | Open-drain power-good indicator | Active-high signal pulled low when VOUT <92% nominal; requires external 20kΩ pullup to BIAS or system rail. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck with integrated FETs | Eliminates external MOSFETs and drivers - reduces BOM count and PCB area by >30% vs discrete solutions. |
| AEC-Q100 qualified (Grade 1) | Validated for -40°C to +125°C ambient operation - suitable for engine bay and front-end electronics mounting. |
| 40V load-dump protection | Withstands ISO 7637-2 Pulse 5a without external TVS - simplifies front-end protection design for 12V/24V systems. |
| 99% maximum duty cycle | Enables dropout operation down to VIN ≈ VOUT + 0.3V - maintains regulated 3.3V output during cranking events. |
| Fixed 3.5ms soft-start | Prevents inrush current and output overshoot during power-up - eliminates need for external soft-start circuitry. |
| PGOOD with 92–94% hysteresis | Provides clean, glitch-free power sequencing signal for downstream processors and FPGAs. |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers SoC, display interface, and audio codecs in head-unit systems with wide input voltage variation during start-stop cycles. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator providing clean, sequenced power with PGOOD confirmation. Use Value: 3.5µA IQ extends battery hold-up time during ignition-off; 40V tolerance avoids external clamping diodes. |
Use Scenario: Supplies image sensor and ISP in rear-view or surround-view cameras mounted near bumpers. IC Role / Device Role / Timing Role: Compact, thermally robust 3.3V source operating continuously in high-ambient environments. Use Value: 12-pin SWTDFN package fits tight camera housings; AEC-Q100 Grade 1 rating ensures reliability at +105°C case temp. |
| Telematics Control Unit (TCU) | Automotive Gateway ECU |
Use Scenario: Powers LTE modem, GNSS receiver, and secure MCU in always-on cellular connectivity modules. IC Role / Device Role / Timing Role: Always-on 3.3V rail with ultra-low standby IQ and fast wake-up from skip mode. Use Value: 3.5µA no-load IQ minimizes parasitic drain on backup battery; EN pin accepts direct CAN inhibit signals. |
Use Scenario: Generates 3.3V for CAN FD transceivers, Ethernet PHY, and domain controller MCUs in zonal architectures. IC Role / Device Role / Timing Role: High-reliability point-of-load regulator with PGOOD-driven power sequencing across multiple domains. Use Value: PGOOD output coordinates startup with other rails; 2.1MHz switching avoids interference with CAN FD (5 Mbps) and Ethernet (100BASE-T1). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20077ATCB/VY+T | 2.0A, 3.3V fixed, 2.1MHz, 65ns min on-time, AEC-Q100 Grade 1 | Optimized for space-constrained 3.3V automotive rails requiring minimal external components | Preferred for new designs targeting compact layout and lowest IQ in 3.3V applications |
| LM61480QRTWRQ1 | 3.5A, adjustable 1–10V, 2.1MHz, 75ns min on-time, AEC-Q100 Grade 1 | Higher current capability and wider output adjustability; larger solution size due to external compensation | Select when >2.0A load or programmable output is required; verify loop stability with external RC network |
Compared with MAX20077ATCB/VY+T, LM61480QRTWRQ1 offers higher output current and flexibility but requires external compensation and occupies more board area; MAX25277ATCB/VY+T provides tighter 3.3V accuracy and lower IQ in a smaller footprint ideal for cost- and space-sensitive automotive modules.
Availability
MAX25277ATCB/VY+T is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and telematics control units requiring stable component supply across extended temperature and lifecycle demands.
Supply support for MAX25277ATCB/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 and signal chain solutions.
The MAX25277 is part of Analog Devices' automotive-qualified power management portfolio, designed specifically for demanding 12V/24V vehicle subsystems requiring ultra-low IQ, high input voltage tolerance, and AEC-Q100 reliability.
FAQ
What is the output voltage configuration of the MAX25277ATCB/VY+T?
The MAX25277ATCB/VY+T is factory-trimmed for a fixed 3.3V output. This is achieved by connecting the FB pin directly to the internal BIAS supply (5V). No external resistor divider is required. The output voltage accuracy is ±2% in forced-PWM (FPWM) mode over the 6V–18V input range, making it suitable for precise I/O rail generation in automotive microcontrollers and sensors.
Does the MAX25277ATCB/VY+T support operation during automotive cold-crank conditions?
Yes, the MAX25277ATCB/VY+T supports cold-crank operation with a minimum input voltage of 3.0V after startup (per datasheet Note 3) and full functionality down to 3.5V. Its 99% maximum duty cycle enables continued regulation of the 3.3V output even when input drops near VOUT, and its undervoltage lockout (UVLO) threshold of 2.73V (typ) ensures reliable restart once battery voltage recovers.
How does the PGOOD signal behave on the MAX25277ATCB/VY+T?
The MAX25277ATCB/VY+T features an open-drain PGOOD output that goes high-impedance when VOUT exceeds 93% of nominal (3.3V), and pulls low when VOUT falls below 92% (3.27V typ). It includes 60µs debounce in PWM mode and requires an external 20kΩ pullup resistor - typically to BIAS or a system 3.3V rail - to generate a clean power-good assertion for downstream sequencing logic.
What thermal performance can be expected from the MAX25277ATCB/VY+T in a four-layer PCB?
On a standard four-layer board, the MAX25277ATCB/VY+T exhibits a junction-to-ambient thermal resistance (θJA) of 41°C/W and junction-to-case (θJC) of 9°C/W. With its exposed pad soldered to a solid ground plane, the device reliably delivers 2.0A at +85°C ambient and maintains operation up to +125°C ambient when derated per thermal simulation - consistent with its AEC-Q100 Grade 1 qualification.
Can the MAX25277ATCB/VY+T be synchronized to an external clock?
Yes, the MAX25277ATCB/VY+T supports external synchronization via the SYNC pin. When driven with a clean CMOS clock between 1.7–2.6MHz, the device locks its internal oscillator to the external frequency, ensuring deterministic switching and reduced beat-frequency EMI. This feature is especially valuable in multi-rail systems where switching noise alignment must be controlled across several converters.
MAX25277ATCB/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)
MAX25277ATCB/VY+T FAQ
1.How can I place an order for MAX25277ATCB/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX25277ATCB/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 MAX25277ATCB/VY+T reliable?
The price and inventory of MAX25277ATCB/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 MAX25277ATCB/VY+T is usually 5 days.
3.What payment methods are accepted for MAX25277ATCB/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX25277ATCB/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX25277ATCB/VY+T?
MAX25277ATCB/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX25277ATCB/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 MAX25277ATCB/VY+T?
For technical support, including MAX25277ATCB/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX25277ATCB/VY+T requirements.
6.How does Aetrix verify that MAX25277ATCB/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX25277ATCB/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 MAX25277ATCB/VY+T meets industry standards.
7.What is the process for return or replacement of MAX25277ATCB/VY+T?
All MAX25277ATCB/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX25277ATCB/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 MAX25277ATCB/VY+T part is unused and in its original packaging.
Return procedure for MAX25277ATCB/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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