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Analog Devices Inc./Maxim Integrated MAX26405AFOCY+
- Part No.:
- MAX26405AFOCY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX26405AFOCY+.pdf
- Description:
- 36V 4A/5A/6A SYNC LOW IQ BUCK CO
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX26405AFOCY+ from Analog Devices is a fully integrated, synchronous Silent Switcher® buck converter delivering up to 5A continuous output current with 3V–36V input range and fixed 5V output. It features 2.1MHz switching frequency, 10μA no-load quiescent current in skip mode, and PGOOD monitoring - designed for automotive and industrial point-of-load power supplies where low EMI and high efficiency across wide VIN are critical.
For engineers reviewing the MAX26405AFOCY+ datasheet, MAX26405AFOCY+ pinout, MAX26405AFOCY+ application, or MAX26405AFOCY+ equivalent, key selection considerations include its 17-pin FC2QFN package, dual-phase capability via VEA/SYNCOUT, spread-spectrum EMI reduction, forced-PWM/skip-mode control via SYNC pin, and ±1% output accuracy at no load in FPWM mode.
Technical Context
The MAX26405AFOCY+ implements average current-mode control with internal slope compensation, enabling robust noise immunity and precise dynamic current sharing in dual-phase configurations. Its architecture supports 99% duty-cycle dropout operation and integrates high-side (45mΩ typ) and low-side (22mΩ typ) DMOS FETs, eliminating external switch requirements.
It uses a fixed 2.1MHz oscillator (±5% tolerance) with optional spread-spectrum modulation (±3% deviation), and includes a 1.8V internal BIAS regulator with 2.2μF decoupling requirement. The device supports both single-phase operation and synchronized dual-phase operation using VEA error-amplifier coupling and 180° out-of-phase SYNCOUT clock.
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 | 5A continuous - matches MAX26405 variant rating per datasheet Table "Electrical Characteristics" under ILIM condition. |
| Switching Frequency | 2.1MHz (fixed) - enables use of sub-1μH inductors and compact ceramic output capacitors; avoids AM band interference. |
| Quiescent Current | 10μA at no load in skip mode - extends battery life in always-on systems such as telematics or sensor nodes. |
| Output Accuracy | ±1% at no load in FPWM mode - ensures reliable logic-level compliance for 5V I/O domains without post-regulation. |
| Thermal Range | −40°C to +125°C ambient - qualified for under-hood automotive and harsh industrial environments. |
| Protection Features | Overtemperature shutdown (165°C), hiccup-mode short-circuit protection, and input UVLO (2.945V–3.175V) - provides fault resilience without external supervision circuitry. |
Pinout & Package
MAX26405AFOCY+ is housed in a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (PGND-connected), symmetrical VIN/PGND layout for optimized EMI performance and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable control input | High-voltage-compatible (up to 42V) logic input; pulls device into ultra-low-IQ shutdown (4μA) when low. |
| BST | Bootstrap supply | Connects 0.1μF capacitor between BST and LX to drive high-side FET gate; critical for proper high-side conduction. |
| SUP | Main power input | Dual pins (3 & 9) reduce IR drop and improve EMI; requires parallel 1μF + 4.7μF ceramic input capacitance. |
| PGND | Power ground | Pins 4,5,7,8 form low-inductance return path for high di/dt switching currents; must be tied directly to thermal pad. |
| LX | Switch node | Connects to inductor switch node; carries full AC ripple current; requires tight layout to minimize EMI and voltage spikes. |
| GND | Analog ground | Separate AGND reference for feedback and error amplifier; must be connected to PGND at single point near IC. |
| BIAS | Internal LDO output | 1.8V regulated supply for internal circuitry; requires ≥2.2μF ceramic capacitor to PGND for stability. |
| FB | Feedback input | Connected to BIAS for fixed 5V output; used with resistor divider for adjustable outputs (0.8V–10V). |
| OUT | Output sense | Direct connection to output rail for accurate remote sensing; improves regulation under PCB trace resistance. |
| VEA | Voltage-error amplifier output | Used to share error signal between controller/target in dual-phase configuration; not used in single-phase. |
| PGOOD | Power-good indicator | Open-drain output asserting when VOUT reaches 92–96% of target; requires external pull-up for system sequencing. |
| SYNC | Mode selection & sync input | Pulled to BIAS for forced-PWM; pulled to GND for skip mode; accepts external clock up to 2.6MHz. |
| SYNCOUT | Phase clock output | 180° out-of-phase clock for dual-phase synchronization; inactive in skip mode or when EN = low. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Integrated dual-loop, symmetrical layout minimizes magnetic field emissions - achieves CISPR 25 Class 5 EMI compliance without shielding. |
| Spread-spectrum modulation | ±3% frequency dithering centered at 2.1MHz reduces peak radiated emissions by >10dB compared to fixed-frequency operation. |
| Dual-phase current sharing | Dynamic current matching <±3% between phases via shared VEA node - enables 10A total output with two MAX26405AFOCY+ units. |
| 99% dropout operation | Maintains regulation down to VIN = VOUT + 0.3V - supports cold-crank scenarios in 12V automotive systems (e.g., VIN = 5.5V → VOUT = 5V). |
| Fixed 2.5ms soft-start | Internally programmed ramp prevents inrush current damage to input capacitors and downstream circuitry during power-up. |
Applications
| Automotive ADAS Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powers image signal processor and radar transceiver in forward-facing camera module requiring clean, low-noise 5V rail. IC Role / Device Role / Timing Role: Primary buck regulator delivering 5V/4.5A with PGOOD sequencing and EMI-constrained layout. Use Value: Silent Switcher® design eliminates need for ferrite beads or metal shields, reducing BOM cost and board area by >30% vs. conventional buck solutions. | Use Scenario: Supplies isolated 5V logic power to digital I/O channels in modular programmable logic controller rack. IC Role / Device Role / Timing Role: Point-of-load regulator converting 24V backplane to 5V with wide-temp operation and overvoltage lockout. Use Value: −40°C to +125°C rating and 36V max input ensure uninterrupted operation during 24V brownouts or surge events per IEC 61000-4-5. |
| Telecom Remote Radio Unit | Medical Diagnostic Sensor Hub |
Use Scenario: Generates stable 5V for FPGA, ADC, and RF front-end in outdoor small-cell base station powered from 48V PoE-derived supply. IC Role / Device Role / Timing Role: High-efficiency buck stage operating at 2.1MHz to avoid interference with LTE/5G bands and enable compact magnetics. Use Value: 2.1MHz switching allows use of 1.0μH inductor (vs. 4.7μH at 400kHz), cutting solution size by 45% while maintaining <15mVpp output ripple. | Use Scenario: Provides ultra-low-noise 5V supply to precision analog front-end and low-power MCU in portable ultrasound probe. IC Role / Device Role / Timing Role: Low-quiescent-current buck converter supporting battery-backed operation with 10μA sleep current. Use Value: Skip-mode operation extends battery runtime by 2.8× vs. FPWM mode at 1mA load, validated per typical operating characteristics curves. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQR | 4.5V–36V input, 8A rated, 2.1MHz, no spread spectrum, 16-pin WQFN | Higher current capacity but larger package (4mm × 4mm); lacks dual-phase VEA coupling and PGOOD accuracy spec | Choose when >5A output or simpler dual-phase sync (via CLKOUT only) is required; not pin-compatible. |
| TPS54560RGTT | 3.5V–60V input, 5A, 100kHz–2.5MHz adjustable, no integrated spread spectrum, 16-pin QFN | Wider VIN range and frequency flexibility, but higher IQ (43μA), no Silent Switcher EMI advantage, no VEA pin | Prefer for high-input-voltage industrial systems where 60V tolerance is mandatory; requires external EMI filtering. |
Compared with LM61480RQR and TPS54560RGTT, the MAX26405AFOCY+ delivers superior EMI performance via Silent Switcher® layout and spread spectrum, tighter output accuracy (±1% vs. ±2%), and native dual-phase support - making it optimal for space-constrained, noise-sensitive automotive and telecom designs where 5A at 5V is sufficient.
Availability
MAX26405AFOCY+ is available at Aetrix Electronics and suitable for automotive ADAS modules, industrial PLC I/O power supplies, and telecom remote radio units requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX26405AFOCY+ 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 precision instrumentation, communications, and industrial markets since 1965.
The MAX26404/MAX26405/MAX26406 family was developed to address EMI-sensitive, high-density power conversion needs in automotive and industrial applications - integrating Silent Switcher® technology, dual-phase scalability, and wide-input operation into a single 3.5mm × 3.75mm package.
FAQ
What is the maximum output current supported by the MAX26405AFOCY+?
The MAX26405AFOCY+ is rated for 5A continuous output current, as confirmed by its ILIM threshold specification (6.5A min, 7.5A max) and thermal characterization in the datasheet's Electrical Characteristics table. This rating assumes operation within the recommended ambient temperature range (−40°C to +125°C), adequate PCB copper area for heat dissipation, and proper input/output capacitor selection per Analog Devices' Application Information section.
Does the MAX26405AFOCY+ support adjustable output voltages, or is it fixed at 5V?
The MAX26405AFOCY+ supports both fixed and adjustable outputs. When the FB pin is connected to BIAS, it delivers a factory-trimmed fixed 5V output with ±1% accuracy. For other voltages between 0.8V and 10V, an external resistor divider from OUT to GND is used - a configuration explicitly validated in the datasheet's "Setting the Output Voltage" section and Table 1.
How does the MAX26405AFOCY+ achieve low EMI performance?
The MAX26405AFOCY+ achieves low EMI through three integrated techniques: (1) Silent Switcher® architecture with symmetrical, balanced power loops minimizing magnetic field radiation; (2) spread-spectrum frequency modulation (±3% around 2.1MHz) reducing peak spectral energy; and (3) FC2QFN package with dual SUP/PGND pins and exposed thermal pad enabling optimal high-frequency grounding - all verified to meet CISPR 25 Class 5 limits without external shielding.
Can the MAX26405AFOCY+ operate in dropout mode, and what is the minimum input voltage for 5V output?
Yes, the MAX26405AFOCY+ supports dropout operation up to 99% duty cycle. For a 5V output, the minimum functional input voltage is approximately 5.05V (VOUT / 0.99), validated by the 99% DMAX specification and dropout behavior described in the General Description. This enables reliable operation during automotive cold-crank events where battery voltage dips to 5.5V while maintaining regulated 5V output.
What is the purpose of the VEA pin on the MAX26405AFOCY+?
The VEA pin on the MAX26405AFOCY+ serves as the voltage-error amplifier output in controller mode and the current-error amplifier input in target mode for dual-phase configurations. As specified in the Pin Descriptions and Detailed Description sections, connecting VEA pins between two MAX26405AFOCY+ devices enables precise dynamic current sharing (<±3%) - a function absent in most monolithic buck converters and critical for scalable high-current designs.
MAX26405AFOCY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Silent Switcher®
- Package/Case:
- 17-PowerWFQFN
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 5A
- Frequency - Switching:
- 400kHz
- 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)
MAX26405AFOCY+ FAQ
1.How can I place an order for MAX26405AFOCY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX26405AFOCY+ 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 MAX26405AFOCY+ reliable?
The price and inventory of MAX26405AFOCY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX26405AFOCY+ is usually 5 days.
3.What payment methods are accepted for MAX26405AFOCY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX26405AFOCY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX26405AFOCY+?
MAX26405AFOCY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX26405AFOCY+ 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 MAX26405AFOCY+?
For technical support, including MAX26405AFOCY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX26405AFOCY+ requirements.
6.How does Aetrix verify that MAX26405AFOCY+ is sourced from the original manufacturer or authorized distributors?
All MAX26405AFOCY+ 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 MAX26405AFOCY+ meets industry standards.
7.What is the process for return or replacement of MAX26405AFOCY+?
All MAX26405AFOCY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX26405AFOCY+, 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 MAX26405AFOCY+ part is unused and in its original packaging.
Return procedure for MAX26405AFOCY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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