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Analog Devices Inc./Maxim Integrated MAX20004AFOD/VY+
- Part No.:
- MAX20004AFOD/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX20004AFOD/VY+.pdf
- Description:
- IC REG BUCK 3.3V 4A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:569
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Product details
Overview
The MAX20004AFOD/VY+ from Maxim Integrated is a 4A, AEC-Q100 qualified automotive synchronous buck converter with integrated high-side and low-side MOSFETs, operating from 3.5V to 36V input and delivering fixed 5V or 3.3V output (or adjustable 1V–10V), 25µA quiescent current in skip mode, and resistor-programmable switching frequency from 220kHz to 2.2MHz - used in automotive navigation head units and point-of-load power rails.
For engineers reviewing the MAX20004AFOD/VY+ datasheet, MAX20004AFOD/VY+ pinout, MAX20004AFOD/VY+ application, or MAX20004AFOD/VY+ equivalent, key selection criteria include its 98% max duty cycle for cold-crank operation, ±2% output voltage accuracy, 40V load-dump tolerance, -40°C to +125°C junction temperature range, and FC2QFN 3.5mm × 3.75mm 17-pin package with integrated BIAS LDO and open-drain RESET output.
Technical Context
This device implements current-mode control with internal slope compensation, enabling stable operation across wide VIN and VOUT ranges. It supports dual operating modes: forced-PWM (FPWM) for EMI-sensitive systems and skip mode for ultra-low quiescent current at light loads - both selectable via the SYNC pin.
Thermal protection includes thermal shutdown at 175°C with 15°C hysteresis, while overcurrent protection uses cycle-by-cycle peak-current limiting on the LX node and hiccup-mode recovery during hard shorts. The integrated 5V BIAS regulator powers internal circuitry and transitions to OUT after startup in fixed-output versions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous - defines maximum sustained PoL rail capability under thermal limits |
| Input Voltage Range | 3.5V to 36V - supports full automotive battery range including cold-crank (3.5V) and load-dump (40V tolerant) |
| Quiescent Current | 25µA in skip mode - enables always-on subsystems without battery drain |
| Output Voltage Accuracy | ±2% - ensures reliable logic-level compliance for MCU, sensor, and interface ICs |
| Switching Frequency | 220kHz to 2.2MHz - allows optimization of inductor size vs. efficiency vs. EMI filtering |
| Duty Cycle Max | 98% - maintains regulation during undervoltage transients down to ~3.6V input for 5V output |
| Operating Temp | -40°C to +125°C - meets under-hood automotive ambient requirements |
| AEC-Q100 Grade | Grade -40°C to +125°C - certified for automotive safety-critical power rails |
Pinout & Package
Package: 3.5mm × 3.75mm, 17-pin FC2QFN with exposed thermal pad (package code F173A3FY+1); RoHS-compliant, 4-layer board θJA = 27°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT | Switching regulator output | Primary power rail output; supplies internal circuitry when BIAS is inactive |
| RESET | Open-drain active-low reset signal | Asserts when VOUT falls below 91% of target; requires external pullup for system reset coordination |
| BST | High-side gate driver bootstrap supply | Must be decoupled with 0.1µF ceramic capacitor between BST and LX for proper high-side FET turn-on |
| PGND (Pins 4,5,7,8) | Power ground return | Low-impedance path for inductor and MOSFET current; must be connected together and tied to thermal pad |
| LX | Switch node | Connects to inductor; carries high di/dt switching current - critical for EMI and layout |
| SUPSW | Internal switch supply input | Directly powers high/low-side FET drivers; bypassed with 0.1µF + 4.7µF ceramics near pin |
| SUP | Main supply input | Connected internally to SUPSW; powers internal bias regulator - must tie externally to SUPSW |
| EN | Enable control input | Logic-compatible enable; requires VSUP > 7.5V before asserting high for safe startup |
| SYNC | Mode select / clock sync input | Ground = skip mode; BIAS or external clock = FPWM; voltage ≤ BIAS required |
| BIAS | 5V linear regulator output | Supplies internal analog blocks; switches to OUT post-startup in fixed-output variants |
| GND | Analog ground reference | Separate from PGND; connects to error amplifier, feedback, and compensation network |
| COMP | Error amplifier output | Connect RC network to GND for loop stability; sets transient response and phase margin |
| FB | Feedback input | Connect to resistive divider (for adjustable VOUT) or directly to BIAS (for 3.3V/5V fixed) |
| FOSC | Frequency setting input | Resistor-to-GND sets fSW; 73.2kΩ → ~400kHz, 12kΩ → ~2.2MHz |
| - | Thermal pad | Internally connected to PGND; must be soldered to PCB copper for thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high/low-side MOSFETs | Eliminates external power switches and reduces BOM count by ≥4 components |
| Spread-spectrum switching (factory enabled) | Reduces peak EMI by ±3% frequency modulation - simplifies EMC filter design |
| Fixed 5ms soft-start | Prevents inrush current damage to input capacitors and downstream loads during power-up |
| 40V load-dump tolerance | Withstands ISO 7637-2 Pulse 5a without external TVS - lowers system protection cost |
| Current-mode control with slope compensation | Enables stable operation at any duty cycle up to 98%, even with low-inductance designs |
| BIAS regulator switchover | Improves light-load efficiency by sourcing internal bias from regulated output instead of linear LDO |
Applications
| Automotive Navigation Head Unit | ADAS Camera Power Rail |
|---|---|
Use Scenario: Powering display controller, touch processor, and audio codec in infotainment head units subject to cold-crank and load-dump events. IC Role / Device Role / Timing Role: Primary 5V PoL regulator delivering stable, low-noise power with fast transient response to digital subsystems. Use Value: 98% duty cycle maintains regulation during 3.5V cold-crank; ±2% accuracy ensures reliable I²C/SPI communication; AEC-Q100 qualification validates long-term reliability. | Use Scenario: Supplying image sensor and ISP in forward-facing ADAS cameras requiring low EMI and high PSRR. IC Role / Device Role / Timing Role: Fixed-frequency FPWM-mode buck converter synchronized to system clock to avoid beat frequencies with pixel readout timing. Use Value: Spread-spectrum option reduces radiated emissions; 2.2MHz operation minimizes inductor size; 40V load-dump tolerance eliminates need for external clamping. |
| Body Control Module (BCM) Core Logic | Automotive Telematics Gateway |
Use Scenario: Providing always-on 3.3V supply to microcontroller, CAN transceivers, and wake-up logic in BCMs with strict quiescent current budgets. IC Role / Device Role / Timing Role: Skip-mode buck converter maintaining 25µA IQ while supporting rapid wake-up and full-load response. Use Value: Ultra-low IQ extends battery life during vehicle sleep; RESET output coordinates MCU brownout recovery; -40°C to +125°C rating covers under-dash mounting. | Use Scenario: Generating isolated 5V rail for cellular modem, GNSS receiver, and Ethernet PHY in telematics control units. IC Role / Device Role / Timing Role: High-efficiency, high-reliability step-down converter interfacing with 12V/24V vehicle bus and supporting multiple load profiles. Use Value: Dual-supply architecture (SUP/SUPSW) improves noise isolation; thermal shutdown with hysteresis prevents latch-up in sealed enclosures; FC2QFN package enables compact 2-layer PCB layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRNXTQ1 | 4A, 3.5V–36V, 2.1MHz max, no integrated BIAS LDO, requires external bias supply | Lacks integrated 5V BIAS regulator - adds external component count and layout complexity | Choose when higher switching frequency (>2.2MHz) is required and BIAS supply is available elsewhere |
| TPS62933EVM-027 | 3A, 3V–36V, 1.8MHz max, 15µA IQ, but not AEC-Q100 qualified | Not automotive-qualified - unsuitable for production vehicles; lower current rating limits use cases | Consider only for non-safety prototyping where AEC-Q100 is not mandated |
Compared with LM61480QRNXTQ1 and TPS62933EVM-027, the MAX20004AFOD/VY+ uniquely integrates a 5V BIAS LDO, supports 98% duty cycle for cold-crank, and delivers AEC-Q100 Grade 0 certification - making it the only option among the three qualified for under-hood automotive core logic rails.
Availability
MAX20004AFOD/VY+ is available at Aetrix Electronics and suitable for automotive navigation head units, ADAS camera modules, and body control modules requiring stable component supply, AEC-Q100 compliance, and long-lifecycle support.
Supply support for MAX20004AFOD/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
Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.
The MAX20004 series belongs to Maxim's automotive-grade power management portfolio, engineered specifically for robust, high-efficiency DC-DC conversion in harsh vehicle environments - emphasizing cold-crank resilience, EMI reduction, and functional safety readiness.
FAQ
What is the maximum duty cycle supported by the MAX20004AFOD/VY+?
The MAX20004AFOD/VY+ supports a maximum duty cycle of 98% (typical), enabling operation during severe automotive undervoltage conditions such as cold-crank. This allows the device to maintain regulation even when input voltage drops close to the output voltage - for example, sustaining 5V output with as little as ~3.6V input. The internal control loop continuously monitors low-side FET conduction time to refresh the BST capacitor and sustain high-duty-cycle operation.
Does the MAX20004AFOD/VY+ require an external BIAS supply?
No, the MAX20004AFOD/VY+ integrates a 5V linear regulator (BIAS) that powers internal analog circuitry. A minimum 2.2µF ceramic capacitor must be placed between BIAS and GND. In fixed-output versions like the MAX20004AFOD/VY+, the BIAS pin transitions to the OUT rail after startup to improve light-load efficiency - eliminating the need for an external bias source and reducing system-level component count.
How is the switching frequency set on the MAX20004AFOD/VY+?
The switching frequency of the MAX20004AFOD/VY+ is set using a single resistor (RFOSC) connected from the FOSC pin to GND. Typical values include 73.2kΩ for ~400kHz and 12kΩ for ~2.2MHz. The relationship follows RFOSC(kΩ) ≈ 29,600 / fSW(kHz) − 1.48. Frequency can also be synchronized to an external clock applied to the SYNC pin, provided the external frequency stays within ±20% of the internal setting.
What protection features does the MAX20004AFOD/VY+ include?
The MAX20004AFOD/VY+ includes cycle-by-cycle current limiting on the LX node, thermal shutdown at 175°C with 15°C hysteresis, overvoltage protection (107% rising threshold), undervoltage lockout on BIAS (2.7V–3.3V), and hiccup-mode recovery during hard shorts. It also withstands 40V load-dump transients per ISO 7637-2 without external clamping - all verified under AEC-Q100 stress testing.
Can the MAX20004AFOD/VY+ operate in both PWM and skip modes?
Yes, the MAX20004AFOD/VY+ supports both forced-PWM (FPWM) and skip modes. Mode selection is controlled by the SYNC pin: connecting SYNC to GND enables automatic skip mode for ultra-low IQ at light loads, while connecting SYNC to BIAS or an external clock forces fixed-frequency PWM operation - essential for EMI-sensitive or timing-critical applications like camera sensors or radar processors.
MAX20004AFOD/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- 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):
- 3.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 4A
- Frequency - Switching:
- 220kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 17-FC2QFN (3.5x3.75)
MAX20004AFOD/VY+ FAQ
1.How can I place an order for MAX20004AFOD/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20004AFOD/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 MAX20004AFOD/VY+ reliable?
The price and inventory of MAX20004AFOD/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20004AFOD/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20004AFOD/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20004AFOD/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20004AFOD/VY+?
MAX20004AFOD/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20004AFOD/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 MAX20004AFOD/VY+?
For technical support, including MAX20004AFOD/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20004AFOD/VY+ requirements.
6.How does Aetrix verify that MAX20004AFOD/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20004AFOD/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 MAX20004AFOD/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20004AFOD/VY+?
All MAX20004AFOD/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20004AFOD/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 MAX20004AFOD/VY+ part is unused and in its original packaging.
Return procedure for MAX20004AFOD/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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