My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX26404AFOBY+
- Part No.:
- MAX26404AFOBY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX26404AFOBY+.pdf
- Description:
- 36V 4A/5A/6A SYNC LOW IQ BUCK CO
- Quantity:
- Payment:
- Shipping:
Inventory:3,731
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX26404AFOBY+ from Analog Devices is a fully integrated, synchronous Silent Switcher® buck converter with integrated high-side and low-side MOSFETs, delivering up to 4A continuous output current from a 3V–36V input. It features fixed 2.1MHz switching frequency, 10μA no-load quiescent current in skip mode, ±1% output voltage accuracy, and PGOOD monitoring - optimized for automotive point-of-load and industrial 12V/24V power rails.
For engineers reviewing the MAX26404AFOBY+ datasheet, MAX26404AFOBY+ pinout, MAX26404AFOBY+ application, or MAX26404AFOBY+ equivalent, key selection criteria include its 3.5mm × 3.75mm 17-pin FC2QFN package, 99% dropout duty cycle, spread-spectrum EMI reduction, dual-phase capability via VEA/SYNCOUT, and support for both fixed (3.3V/5V) and adjustable (0.8V–10V) outputs.
Technical Context
The MAX26404AFOBY+ implements average current-mode control with internal slope compensation, enabling robust noise immunity and precise dynamic current sharing in dual-phase configurations. Its MAXQ® power architecture delivers high phase margin and fast transient response while maintaining stability across wide VIN and load ranges.
It supports forced-PWM and skip-mode operation via the SYNC pin, integrates a 1.8V BIAS regulator with automatic switchover, and provides 33ns minimum on-time for high step-down ratios. Thermal shutdown at 165°C with 20°C hysteresis and hiccup-mode short-circuit protection ensure robust operation in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports direct connection to automotive battery (9V–16V) and industrial 24V rails without pre-regulation. |
| Output Current | 4A continuous - rated for MAX26404 variant; enables compact 5V/3.3V PoL supplies in space-constrained designs. |
| Switching Frequency | Fixed 2.1MHz - allows use of sub-1µH inductors and small ceramic capacitors, minimizing solution footprint and avoiding AM band interference. |
| Quiescent Current | 10μA in skip mode - extends battery life in always-on systems such as telematics and sensor nodes. |
| Output Voltage Accuracy | ±1% in FPWM mode at no load - ensures reliable logic-level compliance for FPGA, MCU, and ASIC core supplies. |
| Duty Cycle Max | 99% - sustains regulation during cold-crank (e.g., 4.5V VIN → 3.3V VOUT), critical for automotive start-stop systems. |
| PGOOD Threshold | 92–96% of VOUT - provides precise power-good assertion for system sequencing and fault detection. |
| Thermal Shutdown | 165°C with 20°C hysteresis - prevents thermal runaway while allowing recovery without full system reset. |
Pinout & Package
MAX26404AFOBY+ is housed in a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (pin 10 GND). The symmetrical layout of SUP and PGND pins minimizes loop area and enhances EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable input | High-voltage-compatible activation control; pulls device into ultra-low 4μA shutdown when low. |
| 2 BST | Bootstrap supply | Drives high-side gate via 0.1μF BST-to-LX capacitor; enables efficient 100% duty-cycle operation. |
| 3,9 SUP | Main power input | Dual-input pins reduce IR drop and improve EMI; require parallel 1μF + 4.7μF ceramic/low-ESR bulk capacitance. |
| 4,5,7,8 PGND | Power ground | Four dedicated low-impedance paths for high-current return; must be tied directly to thermal pad and input/output caps. |
| 6 LX | Switch node | Connects to inductor switch node; requires tight layout to minimize ringing and EMI radiation. |
| 10 GND | Analog ground | Reference for feedback and error amplifier; isolated from PGND except at single-point thermal pad connection. |
| 11 BIAS | Internal 1.8V LDO output | Powers internal circuitry; requires ≥2.2μF ceramic cap to PGND for stability and noise rejection. |
| 12 FB | Feedback input | Accepts resistor-divider for adjustable output (0.8V–10V) or connects to BIAS for fixed 3.3V/5V regulation. |
| 13 OUT | Output sense | Direct connection to regulated output rail; enables accurate remote sensing and PGOOD monitoring. |
| 14 VEA | Voltage-error amplifier output | Enables dual-phase current sharing when connected to target IC's VEA; not used in single-phase mode. |
| 15 PGOOD | Open-drain power-good | Asserts after soft-start and VOUT reaches 92–96%; requires external pull-up for system reset or sequencing. |
| 16 SYNC | Mode control | Pull to GND for skip mode (low IQ); pull to BIAS for forced-PWM (constant frequency); accepts external clock. |
| 17 SYNCOUT | 180° out-of-phase clock | Provides synchronized timing for dual-phase operation; disabled in skip mode. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs. conventional buck converters through balanced, low-loop-area layout and integrated hot-loop capacitors. |
| Spread-spectrum modulation | ±3% frequency dithering centered at 2.1MHz minimizes peak EMI emissions without affecting loop stability or output ripple. |
| Dual-phase capability | Enables up to 8A output using two MAX26404AFOBY+ ICs with <±3% current sharing accuracy via shared VEA pin. |
| Fixed 2.5ms soft-start | Prevents inrush current damage to input capacitors and downstream circuitry during power-up. |
| 99% dropout operation | Maintains regulation down to VIN = VOUT + 0.1V, supporting automotive cold-crank and brownout conditions. |
| Integrated protection | Includes overtemperature shutdown, hiccup-mode short-circuit response, and input UVLO with hysteresis for reliable field operation. |
Applications
| Automotive ADAS Camera Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering image sensor and ISP in rear-view or surround-view camera modules operating from 9V–16V vehicle battery with strict EMI limits. IC Role / Device Role / Timing Role: Primary 3.3V/5V point-of-load regulator delivering clean, low-noise power with PGOOD sequencing for sensor initialization. Use Value: Silent Switcher® EMI reduction eliminates need for ferrite beads or shielding, saving board space and cost while meeting CISPR 25 Class 5. | Use Scenario: Generating isolated 5V logic supply and 3.3V microcontroller core voltage in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: High-efficiency, wide-input buck converter supporting 12V/24V industrial bus inputs and providing stable output under variable load transients. Use Value: 99% duty cycle and -40°C to +125°C operation ensure uninterrupted function during voltage sags and ambient temperature extremes. |
| Telecom Remote Radio Unit | Medical Portable Diagnostic Device |
Use Scenario: Supplying 5V to FPGAs and RF front-end ICs in outdoor 4G/5G small cells powered by 48V PoE or DC distribution. IC Role / Device Role / Timing Role: Compact, high-frequency buck stage stepping 48V down to 5V with minimal external components and low thermal footprint. Use Value: 2.1MHz switching enables use of 1.0µH inductor and reduces total solution size by >40% vs. 400kHz alternatives. | Use Scenario: Battery-powered ultrasound or glucose monitor requiring long runtime and silent operation with no audible coil whine. IC Role / Device Role / Timing Role: Ultra-low-IQ (10μA) buck regulator powering mixed-signal analog front-end and ARM Cortex-M processor. Use Value: Skip-mode efficiency preserves battery capacity during standby; PGOOD enables safe low-power wake-up sequencing. |
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+ | 5A rated output current; higher ILIM threshold (6.5A typ); identical pinout and feature set. | Better suited for higher-load applications where 4A margin is insufficient, e.g., multi-rail FPGA power. | Select MAX26405AFOBY+ when sustained load exceeds 3.5A or peak transients demand >6A current limit. |
| LM61480RGER | 4A rating, 2.1MHz fixed frequency, but lacks spread-spectrum, dual-phase VEA interface, and Silent Switcher EMI architecture. | Lower EMI performance requires additional filtering; no native dual-phase support limits scalability beyond 4A. | Choose LM61480RGER only if cost sensitivity outweighs EMI certification requirements and dual-phase expansion is unnecessary. |
Compared with MAX26405AFOBY+, the MAX26404AFOBY+ offers tighter current-limit tolerance and lower thermal dissipation at 4A loads; versus LM61480RGER, it delivers superior EMI compliance and seamless dual-phase scalability without external controllers or complex layout constraints.
Availability
MAX26404AFOBY+ is available at Aetrix Electronics and suitable for automotive ADAS camera modules, industrial PLC I/O power, telecom remote radio units, and medical portable diagnostics requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX26404AFOBY+ 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, industrial automation, communications, and automotive markets.
The MAX26404AFOBY+ belongs to the MAX264xx Silent Switcher® buck converter family, designed specifically for high-density, low-EMI power conversion in automotive, industrial, and telecom applications where board space, thermal constraints, and regulatory EMI compliance are critical.
FAQ
What is the maximum output current supported by the MAX26404AFOBY+?
The MAX26404AFOBY+ is rated for 4A continuous output current. This rating is validated across the full -40°C to +125°C operating temperature range and accounts for thermal derating in the 3.5mm × 3.75mm FC2QFN package. Peak current capability reaches 6.25A before current-limit activation, per the ILIM specification for the MAX26404 variant.
Does the MAX26404AFOBY+ support adjustable output voltages?
Yes, the MAX26404AFOBY+ supports both fixed and adjustable outputs. Connect the FB pin to BIAS for factory-set 3.3V or 5.0V outputs. For other values between 0.8V and 10V, use an external resistor divider from OUT to GND, with RFB2 ≤ 100kΩ and RFB1 calculated per the equation RFB1 = RFB2 × (VOUT/VFB − 1), where VFB = 0.800V.
How does the MAX26404AFOBY+ achieve low EMI performance?
The MAX26404AFOBY+ achieves low EMI through Analog Devices' Silent Switcher® architecture: symmetrical FC2QFN pinout minimizes hot-loop area, integrated bootstrap and input capacitors reduce parasitic inductance, and optional spread-spectrum modulation dithers the 2.1MHz switching frequency by ±3% to lower peak radiated emissions - all without external filters or shielding.
Can the MAX26404AFOBY+ operate in dropout mode?
Yes, the MAX26404AFOBY+ supports 99% maximum duty cycle operation, enabling dropout mode where VIN approaches VOUT. This allows regulation during automotive cold-crank events (e.g., 4.5V input to 3.3V output) and maintains system uptime in brownout conditions common in industrial 24V systems.
What is the purpose of the VEA pin on the MAX26404AFOBY+?
The VEA pin on the MAX26404AFOBY+ serves as the voltage-error amplifier output in controller mode and the current-error amplifier input in target mode. When two MAX26404AFOBY+ ICs are configured in dual-phase, connecting their VEA pins enables precise dynamic current sharing (<±3%) and eliminates output voltage mismatch between phases.
MAX26404AFOBY+ 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):
- 3.3V
- Voltage - Output (Max):
- -
- 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+ FAQ
1.How can I place an order for MAX26404AFOBY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX26404AFOBY+ 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+ reliable?
The price and inventory of MAX26404AFOBY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX26404AFOBY+ is usually 5 days.
3.What payment methods are accepted for MAX26404AFOBY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX26404AFOBY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX26404AFOBY+?
MAX26404AFOBY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX26404AFOBY+ 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+?
For technical support, including MAX26404AFOBY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX26404AFOBY+ requirements.
6.How does Aetrix verify that MAX26404AFOBY+ is sourced from the original manufacturer or authorized distributors?
All MAX26404AFOBY+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX26404AFOBY+?
All MAX26404AFOBY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX26404AFOBY+, 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+ part is unused and in its original packaging.
Return procedure for MAX26404AFOBY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX26404AFOBY+ Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
