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Analog Devices Inc./Maxim Integrated MAX26404AFOBY+T
- Part No.:
- MAX26404AFOBY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX26404AFOBY+T.pdf
- Description:
- 36V 4A/5A/6A SYNC LOW IQ BUCK CO
- Quantity:
- Payment:
- Shipping:
Inventory:3,700
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Product details
Overview
MAX26404AFOBY+T from Analog Devices is a fully integrated, synchronous Silent Switcher® buck converter with 4A output current capability, 3V–36V input range, and fixed 2.1MHz switching frequency. It integrates high-side and low-side MOSFETs, features PGOOD monitoring, 99% dropout operation, and delivers regulated 5V or 3.3V output in automotive power rail conditioning.
For engineers reviewing the MAX26404AFOBY+T datasheet, MAX26404AFOBY+T pinout, MAX26404AFOBY+T application, or MAX26404AFOBY+T equivalent, this device supports compact, low-EMI point-of-load designs requiring ultra-low quiescent current (10μA), precise ±1% output accuracy, and dual-phase scalability up to 12A.
Technical Context
The MAX26404AFOBY+T implements average current-mode control with a 33ns minimum on-time, enabling stable operation across wide VIN/VOUT ratios without cycle skipping. Its MAXQ® power architecture delivers high phase margin and precision transient response while supporting forced-PWM or automatic skip-mode via SYNC pin logic.
It uses symmetrical FC2QFN package layout and integrated spread-spectrum modulation (±3% at 2.1MHz) to suppress radiated EMI. Dual-phase operation is enabled through VEA error-amplifier sharing and 180° out-of-phase SYNCOUT, with dynamic current sharing accuracy optimized for industrial and automotive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports direct connection to 12V/24V automotive and industrial rails without pre-regulation. |
| Output Current | 4A continuous - rated for sustained load delivery in thermally constrained PCB layouts. |
| Switching Frequency | 2.1MHz fixed - enables use of sub-1μH inductors and <10μF ceramic output capacitors for space-constrained designs. |
| Quiescent Current | 10μA in skip mode - extends battery life in always-on automotive modules and IoT edge nodes. |
| Output Accuracy | ±1% at no load in FPWM mode - ensures reliable voltage margining for sensitive microcontrollers and sensors. |
| Duty Cycle Max | 99% - maintains regulation down to VIN = VOUT + 0.36V, critical for cold-crank automotive conditions. |
| Thermal Range | −40°C to +125°C ambient - qualified for under-hood and industrial control cabinet deployment. |
Pinout & Package
MAX26404AFOBY+T is housed in a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (pin 10 GND). The symmetrical SUP/PGND pin arrangement minimizes loop area and enhances EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable input | High-voltage compatible (up to 42V); pulls device into shutdown (4μA IQ) when low. |
| 2 BST | Bootstrap supply | Drives high-side FET gate; requires 0.1μF capacitor between BST and LX for proper bootstrapping. |
| 3,9 SUP | Main supply input | Accepts 3V–36V; decoupled with parallel 1μF + 4.7μF ceramic capacitors to PGND. |
| 4,5,7,8 PGND | Power ground | Low-impedance return path for high-current switching; must be tied together and connected to thermal pad. |
| 6 LX | Switch node | Connects to inductor; carries high di/dt; requires short, low-inductance trace to minimize EMI. |
| 10 GND | Analog ground | Reference for feedback and internal circuitry; isolated from PGND except at single-point thermal pad. |
| 11 BIAS | Internal 1.8V LDO output | Powers internal bias circuits; requires ≥2.2μF ceramic capacitor to PGND for stability. |
| 12 FB | Feedback input | Connects to BIAS for fixed 3.3V/5V output; or to resistor divider for adjustable 0.8V–10V regulation. |
| 13 OUT | Output voltage sense | Monitors regulated output; used with FB for remote sensing in high-current applications. |
| 14 VEA | Voltage-error amplifier output | Shared between controller/target ICs in dual-phase configuration to enforce matched current sharing. |
| 15 PGOOD | Open-drain power-good flag | Asserts after soft-start and output reaches 92–96% of target; requires external pull-up for system sequencing. |
| 16 SYNC | Mode selection clock input | Pull to GND for skip mode; to BIAS for forced-PWM; accepts external clock up to 2.6MHz. |
| 17 SYNCOUT | 180° out-of-phase clock output | Enables dual-phase synchronization; inactive in skip mode; drives target IC's SYNC input. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs. conventional buck converters, eliminating need for metal shielding in Class B EMC environments. |
| Integrated high-/low-side FETs | RDSON_HS = 45mΩ (typ), RDSON_LS = 22mΩ (typ) - eliminates external MOSFET selection and gate driver design effort. |
| Fixed 2.5ms soft-start | Prevents inrush current damage to input capacitors and upstream power sources during cold start. |
| Spread-spectrum modulation | ±3% frequency dither centered at 2.1MHz - lowers peak EMI emissions without affecting loop stability or efficiency. |
| Dual-phase capability | VEA pin sharing and SYNCOUT phase alignment enable accurate current sharing (<±3%) between two MAX26404AFOBY+T devices. |
| Robust protection suite | Includes overtemperature shutdown (165°C), hiccup-mode short-circuit protection, and input UVLO with hysteresis (2.725V/2.870V). |
Applications
| Automotive ADAS Power Rail | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powers image signal processor and radar transceiver in 12V vehicle electrical system during cold-crank (VIN drops to 6V). IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3V/5V with 99% duty cycle and PGOOD sequencing for safety-critical subsystems. Use Value: Maintains regulation below 7V input while consuming only 10μA in standby - meets ISO 16750-2 pulse 4 requirements. |
Use Scenario: Supplies 5V to isolated digital I/O channels in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Point-of-load converter with spread-spectrum EMI reduction to pass EN 61000-6-4 industrial emission limits. Use Value: Eliminates need for ferrite beads or shielded inductors, reducing BOM cost and board area by >25% vs. legacy solutions. |
| Telecom Base Station RF Front-End | Medical Imaging Sensor Bias |
|
Use Scenario: Generates clean 5V supply for GaN PA bias and analog front-end in 48V-powered small cell radio unit. IC Role / Device Role / Timing Role: Low-noise synchronous buck with 2.1MHz switching to avoid interference with 2.4GHz/5GHz RF bands. Use Value: Achieves <10mVpp output ripple with ceramic output caps - meets stringent spectral purity requirements for LTE/5G transmission. |
Use Scenario: Provides ultra-stable 3.3V bias for CMOS image sensor array in portable ultrasound probe. IC Role / Device Role / Timing Role: Precision DC-DC converter with ±1% output accuracy and PGOOD monitoring for diagnostic self-test. Use Value: Ensures consistent pixel response across temperature (-40°C to +85°C), eliminating gain drift in time-of-flight measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX26405AFOBY+T | 5A rated output current; higher ILIM threshold (6.5A typ); identical pinout and feature set. | Better suited for applications requiring margin above 4A continuous load or higher peak current headroom. | Select MAX26405AFOBY+T when design load exceeds 3.6A RMS or requires >10% current derating for long-term reliability. |
| LM61480RQR | 4A rating, 3V–36V input, but uses voltage-mode control; no spread-spectrum; larger 4mm × 4mm QFN-16 package. | Lacks dual-phase support and Silent Switcher EMI performance; requires external compensation network. | Choose LM61480RQR only if cost sensitivity outweighs EMI compliance needs and board space allows larger footprint. |
Compared with MAX26405AFOBY+T, the MAX26404AFOBY+T offers tighter current-limit tolerance and lower conduction loss at 4A loads, while LM61480RQR trades EMI robustness and integration for broader distributor availability and simpler loop compensation.
Availability
MAX26404AFOBY+T is available at Aetrix Electronics and suitable for automotive ADAS power supplies, industrial PLC I/O modules, and telecom RF front-end designs requiring stable component supply, full RoHS compliance, and guaranteed long-term manufacturability.
Supply support for MAX26404AFOBY+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 industrial, automotive, communications, and healthcare markets with precision power, sensing, and signal chain solutions.
The MAX26404AFOBY+T belongs to the MAX264xx Silent Switcher® buck converter family, engineered specifically for high-reliability, low-EMI power conversion in space- and noise-constrained automotive and industrial environments.
FAQ
What is the maximum input voltage the MAX26404AFOBY+T can withstand?
The MAX26404AFOBY+T has an absolute maximum SUP rating of +42V. However, its recommended operating input range is 3V to 36V. Operation above 36V is not guaranteed and may trigger overvoltage protection or cause permanent damage. For automotive applications with load-dump transients, external TVS clamping is required before the SUP pin to limit voltage to ≤42V.
Does the MAX26404AFOBY+T support adjustable output voltages?
Yes, the MAX26404AFOBY+T supports adjustable output voltages from 0.8V to 10V using an external resistor divider connected between OUT, FB, and GND. When FB is tied directly to BIAS, it delivers fixed 3.3V or 5.0V output depending on factory configuration. The MAX26404AFOBY+T variant is specified for fixed 5V output per its ordering code.
How does the MAX26404AFOBY+T achieve low EMI performance?
The MAX26404AFOBY+T achieves low EMI through three integrated techniques: (1) Silent Switcher® architecture with balanced, symmetrical power loops; (2) spread-spectrum frequency modulation (±3% at 2.1MHz); and (3) FC2QFN package with dedicated PGND/SUP pin pairs that minimize switching loop inductance. These features collectively reduce peak radiated emissions by >30dB compared to standard buck converters.
Can the MAX26404AFOBY+T be used in dual-phase configurations?
Yes, the MAX26404AFOBY+T supports dual-phase operation via its VEA and SYNCOUT pins. One device acts as controller (driving SYNCOUT), the other as target (SYNCOUT tied to BIAS). This configuration enables up to 8A total output with precise current sharing (<±3%). The MAX26404AFOBY+T must operate in forced-PWM mode (SYNC = BIAS) for dual-phase synchronization.
What thermal management considerations apply to the MAX26404AFOBY+T?
The MAX26404AFOBY+T has a junction-to-board thermal resistance (θJB) of 9.9°C/W on a JEDEC 4-layer board. To maintain TJ ≤ 125°C at 4A load, ensure ≥100mm² of 2oz copper connected to the exposed thermal pad (pin 10 GND) with ≥4 thermal vias. Derate output current by 10% for every 10°C above +70°C ambient unless enhanced cooling is implemented.
MAX26404AFOBY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Silent Switcher®
- Package/Case:
- 17-PowerWFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V (3.3V)
- Voltage - Output (Max):
- 10V
- Current - Output:
- 4A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 17-FC2QFN (3.5x3.75)
MAX26404AFOBY+T FAQ
1.How can I place an order for MAX26404AFOBY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX26404AFOBY+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 MAX26404AFOBY+T reliable?
The price and inventory of MAX26404AFOBY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX26404AFOBY+T is usually 5 days.
3.What payment methods are accepted for MAX26404AFOBY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX26404AFOBY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX26404AFOBY+T?
MAX26404AFOBY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX26404AFOBY+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 MAX26404AFOBY+T?
For technical support, including MAX26404AFOBY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX26404AFOBY+T requirements.
6.How does Aetrix verify that MAX26404AFOBY+T is sourced from the original manufacturer or authorized distributors?
All MAX26404AFOBY+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 MAX26404AFOBY+T meets industry standards.
7.What is the process for return or replacement of MAX26404AFOBY+T?
All MAX26404AFOBY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX26404AFOBY+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 MAX26404AFOBY+T part is unused and in its original packaging.
Return procedure for MAX26404AFOBY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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