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Analog Devices Inc./Maxim Integrated MAX20402AFLF/VY+
- Part No.:
- MAX20402AFLF/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-WFQFN
- Datasheet:
-
MAX20402AFLF/VY+.pdf
- Description:
- IC REG BUCK ADJ 2.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:315
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Product details
Overview
MAX20402AFLF/VY+ from Analog Devices is an automotive-grade, fully integrated synchronous buck converter with Silent Switcher® architecture, delivering up to 2.5A continuous output current across a 3V–36V input range, featuring adjustable 0.8V–14V output voltage, 2.1MHz fixed switching frequency, ±6% spread-spectrum modulation, and AEC-Q100 qualification for radar modules and ADAS power rails.
For engineers reviewing the MAX20402AFLF/VY+ datasheet, MAX20402AFLF/VY+ pinout, MAX20402AFLF/VY+ application, or MAX20402AFLF/VY+ equivalent, key selection considerations include its 2.1MHz operation enabling compact 1.5μH inductor use, 10μA no-load quiescent current in skip mode, 99% dropout duty cycle, ±1.5% output accuracy in FPWM mode, and FC2QFN-15 (3mm × 3mm) package with symmetrical EMI-optimized pinout.
Technical Context
The MAX20402AFLF/VY+ implements average current-mode control with internal slope compensation, supporting forced-PWM (FPWM), skip-mode, and external synchronization via SYNC pin. Its MAXQ® power architecture delivers precision transient response and stable phase margin without external compensation.
It integrates high-side (95–165mΩ) and low-side (45–85mΩ) DMOS FETs, a 1.8V BIAS LDO, and a 2.5ms internal soft-start. Protection includes overtemperature shutdown (175°C), hiccup-mode short-circuit response, overvoltage clamping, and 42V load-dump tolerance - all validated for -40°C to +125°C junction operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports cold-crank (3V) and load-dump (42V transient) conditions in automotive systems. |
| Output Current | 2.5A continuous - sufficient for powering SoCs, sensors, and interface ICs in ADAS ECUs. |
| Switching Frequency | 2.1MHz fixed - enables use of small 1.5μH inductors and reduces EMI fundamental below AM band. |
| Output Voltage Range | Adjustable 0.8V–14V - configured via external resistor divider on FB/OUT pin for flexible system rail generation. |
| Quiescent Current | 10μA in skip mode - extends battery life during vehicle sleep modes without compromising wake-up responsiveness. |
| Duty Cycle Max | 99% - maintains regulation down to VIN = VOUT + ~0.3V, critical for 12V-to-5V or 12V-to-3.3V conversion near dropout. |
| PGOOD Accuracy | ±2.25% windowed threshold - provides reliable system-level power sequencing and fault detection. |
Pinout & Package
The MAX20402AFLF/VY+ is housed in a 15-pin FC2QFN package (3mm × 3mm, 0.4mm pitch) with exposed thermal pad, optimized for low-inductance, symmetrical PCB layout to suppress magnetic-field EMI.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | High-voltage-tolerant (up to 42V), active-high logic input; enables converter only when pulled above 0.9V (typ). |
| SUP (Pins 3,7) | High-side supply input | Power source for internal gate drivers and bias circuitry; requires dual bypass (0.1μF + 2.2μF) per pin for low-impedance path. |
| PGND (Pins 4,6) | Power ground return | Low-impedance return path for high di/dt switch currents; must be connected directly to thermal pad and input/output capacitors. |
| LX (Pin 5) | Switch node | Connection to inductor's switched side; carries full AC ripple current and high dv/dt - requires minimal trace area. |
| BST (Pin 9) | Bootstrap capacitor terminal | Connects 0.1μF ceramic capacitor to LX to generate gate drive voltage for high-side FET. |
| BIAS (Pin 11) | Internal 1.8V LDO output | Powers analog blocks; requires ≥2.2μF ceramic capacitor to PGND for stability and noise rejection. |
| SPS (Pin 12) | Spread-spectrum enable | Logic-high enables ±6% triangular frequency modulation to reduce peak EMI emissions by spreading energy across spectrum. |
| FB/OUT (Pin 13) | Feedback/sense input | In adjustable mode, functions as error amplifier input (0.8V reference); connects to resistor divider from VOUT to set output voltage. |
| PGOOD (Pin 14) | Open-drain status output | Active-high signal indicating VOUT within ±2.25% window; requires external pull-up (e.g., 20kΩ to BIAS) for system monitoring. |
| SYNC (Pin 15) | Mode control & sync input | Pulled low → skip mode; pulled high → FPWM; driven by external clock → synchronized operation at 1.7–2.6MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Symmetrical FC2QFN pinout and integrated dual-loop layout minimize magnetic field coupling, achieving CISPR 25 Class 5 compliance without shielding. |
| MAXQ® power architecture | Guarantees >60° phase margin and fast transient response (<10μs recovery) without external compensation components. |
| Spread-spectrum modulation | ±6% frequency dithering at 1.25ms period (400kHz) or 200μs (2.1MHz) reduces radiated EMI peaks by up to 10dB. |
| Automotive robustness | AEC-Q100 Grade 1 qualification (-40°C to +125°C), 42V load-dump tolerance, and hiccup-mode short-circuit protection ensure reliability in harsh environments. |
| Flexible enable & sequencing | EN pin accepts 3V–42V logic levels; internal UVLO thresholds (2.9V rise / 2.725V fall) support clean start-up from degraded battery rails. |
Applications
| Radar Power Supply | ADAS Domain Controller Rail |
|---|---|
Use Scenario: Powers 77GHz radar transceiver ICs requiring ultra-low noise, tight voltage regulation, and rapid load transient response under wide temperature swings. IC Role / Device Role / Timing Role: Primary 5V or 3.3V point-of-load regulator with PGOOD signaling for radar SoC power sequencing and fault reporting. Use Value: 2.1MHz switching and Silent Switcher layout eliminate need for ferrite beads or shielded inductors, reducing BOM count and board area by >30%. | Use Scenario: Supplies core voltage to automotive domain controllers (e.g., NVIDIA Orin, TI Jacinto) operating in safety-critical ADAS applications. IC Role / Device Role / Timing Role: Adjustable-output buck converter generating 1.0V–1.8V rails with ±1.5% accuracy and windowed PGOOD for ASIL-B functional safety monitoring. Use Value: 99% duty cycle and 10μA quiescent current enable uninterrupted operation during cold-crank and extended vehicle sleep states. |
| Infotainment System PMIC Core | Industrial HV DC-DC Pre-regulator |
Use Scenario: Generates stable 5V/3.3V rails for display controllers, audio codecs, and USB interfaces in automotive infotainment head units. IC Role / Device Role / Timing Role: High-efficiency pre-regulator stepping down 12V/24V battery to intermediate rails before LDO post-regulation. Use Value: Spread-spectrum and forced-PWM modes suppress EMI that would otherwise interfere with AM/FM radio reception and Bluetooth/WiFi coexistence. | Use Scenario: Used in industrial battery-powered equipment (e.g., portable test gear, mobile robotics) requiring wide-input DC-DC conversion from 12V–36V nominal sources. IC Role / Device Role / Timing Role: Compact, thermally efficient buck stage delivering 2.5A at 3.3V/5V/12V with integrated protection against overvoltage, overtemperature, and short circuits. Use Value: FC2QFN-15 package with exposed thermal pad achieves 40.6°C/W θJA on 4-layer EV kit, enabling full-load operation without heatsink at +70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRPWRQ1 | 4.5V–36V input, 8A output, 2.1MHz, no spread-spectrum, larger 16-pin WQFN (3.5mm × 4.5mm) | Higher current capability but lacks integrated spread-spectrum EMI reduction and Silent Switcher layout benefits | Select when >2.5A output or higher thermal margin is required; not drop-in due to different pinout and footprint. |
| TPS6286418ARQYR | 3V–18V input, 4A output, 2.25MHz, integrated PMBus, smaller 12-pin QFN (2mm × 3mm), no AEC-Q100 | Targeted at non-automotive industrial/compute; lacks 42V load-dump tolerance and automotive qualification | Choose for space-constrained non-automotive designs needing digital control; unsuitable for automotive safety-critical use. |
Compared with LM61480QRPWRQ1 and TPS6286418ARQYR, the MAX20402AFLF/VY+ uniquely combines AEC-Q100 Grade 1 qualification, Silent Switcher EMI suppression, and 2.1MHz operation in a 3mm × 3mm FC2QFN - making it optimal for size- and noise-sensitive automotive ADAS power stages where regulatory compliance and board-area minimization are primary constraints.
Availability
MAX20402AFLF/VY+ is available at Aetrix Electronics and suitable for automotive radar modules, ADAS domain controllers, and industrial high-voltage DC-DC converters requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant performance.
Supply support for MAX20402AFLF/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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The MAX20402/MAX20403 family is part of Analog Devices' automotive power management portfolio, designed specifically for low-EMI, high-reliability DC-DC conversion in radar, camera, and domain controller subsystems operating under stringent CISPR 25 and AEC-Q100 requirements.
FAQ
What output voltage range does the MAX20402AFLF/VY+ support?
The MAX20402AFLF/VY+ supports an adjustable output voltage range of 0.8V to 14V, set using an external resistor divider connected to the FB/OUT pin. Its internal 0.8V feedback reference enables precise regulation across this range, with ±1.5% accuracy in forced-PWM mode. Unlike fixed-output variants (e.g., MAX20402AFLA/VY+ at 5V), the MAX20402AFLF/VY+ does not have internal voltage programming - all configuration is external. This flexibility allows the MAX20402AFLF/VY+ to serve diverse rail requirements in ADAS and infotainment systems.
Does the MAX20402AFLF/VY+ require external compensation components?
No, the MAX20402AFLF/VY+ does not require external compensation components. Its MAXQ® power architecture incorporates internal loop compensation optimized for stability across the full 0.8V–14V output range and recommended output capacitance values (e.g., 23μF effective COUT at 2.1MHz). This eliminates the need for external Type-II or Type-III compensation networks, simplifying design, reducing BOM count, and improving consistency across production units. The MAX20402AFLF/VY+ achieves >60° phase margin and robust transient response without user-adjustable compensation.
How does the MAX20402AFLF/VY+ handle light-load efficiency?
The MAX20402AFLF/VY+ automatically enters skip mode at light loads when the SYNC pin is pulled low, reducing quiescent current to 10μA (typ) at no load. In this mode, the device pulses the output only as needed to maintain regulation, minimizing switching losses. For applications requiring constant-frequency operation (e.g., EMI-sensitive systems), a logic-high SYNC signal forces fixed-PWM mode, maintaining 2.1MHz operation regardless of load. The MAX20402AFLF/VY+ thus offers selectable efficiency vs. EMI trade-offs without changing external components.
Is the MAX20402AFLF/VY+ qualified for automotive applications?
Yes, the MAX20402AFLF/VY+ is AEC-Q100 qualified (Grade 1: -40°C to +125°C TJ), 42V load-dump tolerant, and designed to meet CISPR 25 Class 5 radiated emissions limits. It includes automotive-specific protections: hiccup-mode short-circuit response, overtemperature shutdown with 15°C hysteresis, and precision windowed PGOOD for functional safety monitoring. These features make the MAX20402AFLF/VY+ suitable for safety-critical ADAS, radar, and infotainment applications where reliability under harsh electrical and thermal conditions is mandatory.
What package type and thermal performance does the MAX20402AFLF/VY+ use?
The MAX20402AFLF/VY+ uses a 15-pin FC2QFN package (3mm × 3mm, 0.4mm pitch) with exposed thermal pad. On a 4-layer evaluation kit board, it achieves a junction-to-ambient thermal resistance (θJA) of 40.6°C/W and junction-to-board (θJB) of 11.7°C/W. The symmetrical pinout and thermal pad design enable efficient heat transfer to internal copper planes, allowing full 2.5A output at +70°C ambient without external heatsinking. This compact, thermally robust package supports high-density automotive PCB layouts while maintaining EMI performance.
MAX20402AFLF/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 15-WFQFN
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 12V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 15-FC2QFN (3x3)
MAX20402AFLF/VY+ FAQ
1.How can I place an order for MAX20402AFLF/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20402AFLF/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 MAX20402AFLF/VY+ reliable?
The price and inventory of MAX20402AFLF/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20402AFLF/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20402AFLF/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20402AFLF/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20402AFLF/VY+?
MAX20402AFLF/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20402AFLF/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 MAX20402AFLF/VY+?
For technical support, including MAX20402AFLF/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20402AFLF/VY+ requirements.
6.How does Aetrix verify that MAX20402AFLF/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20402AFLF/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 MAX20402AFLF/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20402AFLF/VY+?
All MAX20402AFLF/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20402AFLF/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 MAX20402AFLF/VY+ part is unused and in its original packaging.
Return procedure for MAX20402AFLF/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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