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Analog Devices Inc./Maxim Integrated MAX20402AFLF/VY+T
- Part No.:
- MAX20402AFLF/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-WFQFN
- Datasheet:
-
MAX20402AFLF/VY+T.pdf
- Description:
- IC REG BUCK ADJ 2.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,091
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Product details
Overview
MAX20402AFLF/VY+T 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. It features adjustable output voltage (0.8V–14V), 2.1MHz fixed switching frequency, ±6% spread-spectrum modulation, and AEC-Q100 qualification for ADAS and radar power rails.
For engineers reviewing the MAX20402AFLF/VY+T datasheet, MAX20402AFLF/VY+T pinout, MAX20402AFLF/VY+T application, or MAX20402AFLF/VY+T equivalent, this page delivers verified technical context, validated pin functions, real-world automotive use cases, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The MAX20402AFLF/VY+T implements average current-mode control with internal slope compensation, enabling stable operation down to 1% duty cycle and supporting 99% dropout mode. Its MAXQ® power architecture ensures precise transient response and ≥60° phase margin without external compensation.
It integrates high-side (95mΩ typ) and low-side (45mΩ typ) DMOS FETs, a 1.8V BIAS LDO, and a 2.5ms internal soft-start. Operation modes-skip (10μA IQ) and forced-PWM-are selected via SYNC pin, while SPS enables ±6% triangular spread-spectrum modulation synchronized to the internal oscillator.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V - supports cold-crank (3V) and load-dump (42V transient-tolerant) in automotive systems |
| Output Current | 2.5A continuous - sufficient for powering SoCs, sensors, and transceivers in ADAS modules |
| Switching Frequency | 2.1MHz fixed - enables compact 1.5μH inductor and <25μF effective output capacitance |
| Output Voltage Range | 0.8V to 14V adjustable - configured via external resistor divider on FB/OUT pin |
| Quiescent Current | 10μA in skip mode - meets automotive idle-current requirements for always-on domains |
| EMI Performance | CISPR 25 Class 5 compliant - achieved via symmetrical FC2QFN layout and spread-spectrum modulation |
| Thermal Protection | 175°C shutdown with 15°C hysteresis - ensures robust operation in under-hood environments |
| AEC-Q100 Grade | Grade -40°C to +125°C - qualified for engine bay and front-end radar ECU placement |
Pinout & Package
MAX20402AFLF/VY+T is housed in a 3mm × 3mm, 15-pin FC2QFN package with exposed thermal pad (package code F153B3FY+1). The symmetrical pin arrangement minimizes magnetic field coupling and improves EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | High-voltage-tolerant (up to 42V), active-high logic input; enables BIAS LDO and converter startup when >0.9V |
| SUP (Pins 3,7) | High-side supply rail | Dual-input for balanced input capacitor placement; powers internal gate drivers and high-side FET |
| PGND (Pins 4,6) | Power ground return | Dedicated low-impedance path for high di/dt switching currents; must be connected directly to thermal pad |
| LX (Pin 5) | Switch node | Connection point for external inductor; carries full switching current and high dv/dt transients |
| 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 circuitry; requires ≥2.2μF ceramic capacitor to PGND for stability and noise rejection |
| SPS (Pin 12) | Spread-spectrum enable | Logic-high enables ±6% frequency dithering; disabled during external clock sync |
| FB/OUT (Pin 13) | Feedback/sense input | Configured as adjustable feedback node (0.8V reference); connects to resistor divider for VOUT programming |
| PGOOD (Pin 14) | Open-drain status output | Active-high signal indicating VOUT within ±5% window; requires external 20kΩ pull-up to BIAS or VOUT |
| SYNC (Pin 15) | Mode control & sync input | Low = skip mode; high = forced PWM; external clock input (1.7–3.4MHz) enables synchronization |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Symmetrical 15-pin FC2QFN layout cancels magnetic fields, reducing radiated EMI by >20dB vs. conventional QFN |
| MAXQ® power architecture | Guarantees ≥60° phase margin and fast transient response (<10μs recovery) without external compensation components |
| 99% duty-cycle dropout operation | Enables regulation down to VIN − VOUT = 200mV, critical for automotive cold-crank (3V start) scenarios |
| 42V load-dump tolerance | Withstands ISO 7637-2 Pulse 5a transients without external TVS, simplifying front-end protection design |
| Accurate PGOOD window | ±1.25% UV/OV thresholds (93%–105% of nominal VOUT) with 100μs debounce ensure reliable system power sequencing |
| AEC-Q100 Grade 1 | Qualified for -40°C to +125°C junction temperature, meeting reliability requirements for safety-critical ADAS ECUs |
Applications
| Radar Power Supply | ADAS Domain Controller Rail |
|---|---|
Use Scenario: Supplies clean, low-noise 1.2V/1.8V core power to 77GHz radar transceivers in front-bumper modules. IC Role / Device Role / Timing Role: Primary DC-DC regulator converting 12V battery to sub-2V processor rails with <10mVpp ripple at 2.1MHz. Use Value: Spread-spectrum modulation avoids interference with radar chirp frequencies; 99% duty cycle sustains operation during engine cranking. | Use Scenario: Powers vision-processing SoC (e.g., NVIDIA Orin) I/O and memory rails in centralized ADAS domain controllers. IC Role / Device Role / Timing Role: Secondary buck stage generating 3.3V/5V from intermediate 5V rail, synchronized to system clock via SYNC pin. Use Value: Forced-PWM mode eliminates audible noise; PGOOD enables safe boot sequencing before SoC initialization. |
| Automotive Infotainment Display | Camera Module Power |
Use Scenario: Delivers 5V/2A to LCD backlight drivers and touch controller in digital instrument clusters. IC Role / Device Role / Timing Role: Fixed-output buck converter operating in skip mode during display sleep to meet <50μA system standby budget. Use Value: 10μA quiescent current extends battery life in key-off state; AEC-Q100 qualification ensures long-term reliability in dashboard environment. | Use Scenario: Provides 1.2V core and 2.8V I/O rails to 8MP automotive camera sensors (e.g., Sony IMX570) in surround-view systems. IC Role / Device Role / Timing Role: Adjustable-output buck converter programmed to 1.2V with tight ±1.5% accuracy in FPWM mode. Use Value: ±1.5% output accuracy prevents sensor ADC gain drift; thermal shutdown protects against enclosed housing overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRNXTQ1 | 4.5V–36V input, 8A output, 2.1MHz, no spread spectrum, 14-pin WQFN | Higher current capability but larger solution size; lacks CISPR 25 Class 5 compliance out-of-box | Select when >2.5A load or lower cost per amp is required; revalidate EMI with external filters |
| TPS6286418RTERQ1 | 3V–16V input, 4A output, 2.25MHz, integrated ferrite-bead filter, 16-pin VQFN | Lower VIN max excludes load-dump resilience; includes integrated EMI filter but higher BOM count | Select for space-constrained infotainment apps where 16V max VIN is acceptable and board area is premium |
Compared with LM61480QRNXTQ1 and TPS6286418RTERQ1, the MAX20402AFLF/VY+T uniquely combines AEC-Q100 Grade 1, 42V transient tolerance, and built-in CISPR 25 Class 5 compliance in a 3mm × 3mm footprint-making it optimal for radar and safety-critical power rails where EMI, size, and automotive robustness are non-negotiable.
Availability
MAX20402AFLF/VY+T is available at Aetrix Electronics and suitable for automotive ADAS, radar modules, and infotainment systems requiring stable component supply, long lifecycle support, and AEC-Q100-compliant performance.
Supply support for MAX20402AFLF/VY+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 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 product line was designed specifically for automotive power conversion in safety-critical ADAS and radar systems, emphasizing ultra-low EMI, wide input range, and AEC-Q100 reliability.
FAQ
What output voltage range does the MAX20402AFLF/VY+T support?
The MAX20402AFLF/VY+T supports an adjustable output voltage range of 0.8V to 14V, set using an external resistor divider on the FB/OUT pin. Its internal 0.8V feedback reference enables precise regulation across this range, with ±1.5% accuracy in forced-PWM mode. This flexibility allows the MAX20402AFLF/VY+T to replace multiple fixed-output variants in designs requiring programmable rails for processors, sensors, or interfaces.
How does the MAX20402AFLF/VY+T achieve CISPR 25 Class 5 compliance?
The MAX20402AFLF/VY+T achieves CISPR 25 Class 5 compliance through three integrated features: Silent Switcher® symmetrical FC2QFN pinout that cancels magnetic fields, ±6% spread-spectrum frequency modulation to reduce peak emissions, and optimized internal gate drive timing that minimizes dv/dt noise. These features eliminate the need for external EMI filters in most automotive layouts, unlike conventional buck converters requiring ferrite beads or common-mode chokes to pass Class 5 testing.
Can the MAX20402AFLF/VY+T operate during automotive cold-crank conditions?
Yes, the MAX20402AFLF/VY+T operates continuously during cold-crank conditions with input voltages as low as 3V. Its 99% maximum duty cycle enables regulation even when VIN approaches VOUT, and its undervoltage lockout (UVLO) has a falling threshold of 2.725V - well below typical 3V cold-crank minimums. This ensures uninterrupted power to radar or camera modules during engine start, a critical requirement validated in AEC-Q100 stress testing.
What protection features are integrated into the MAX20402AFLF/VY+T?
The MAX20402AFLF/VY+T integrates overcurrent protection (OCP) with hiccup-mode short-circuit response, thermal shutdown at 175°C with 15°C hysteresis, output overvoltage protection (OVP), and input UVLO with hysteresis. Its average current-mode control inherently rejects noise on the current sense path, and the PGOOD pin provides accurate windowed monitoring (93%–105% of VOUT) with 100μs debounce - all essential for fault-tolerant automotive power systems.
Is the MAX20402AFLF/VY+T pin-compatible with other devices in the MAX20402/MAX20403 family?
Yes, the MAX20402AFLF/VY+T shares identical 15-pin FC2QFN pinout and footprint with all MAX20402 and MAX20403 variants, including fixed-output versions (e.g., MAX20402AFLA/VY+) and MAX20403 3.5A derivatives. This enables drop-in replacement during design iteration or qualification - for example, upgrading to MAX20403 for higher current or switching to a fixed 5V version - without PCB layout changes, provided thermal and inductor current ratings are revalidated.
MAX20402AFLF/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 15-WFQFN
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX20402AFLF/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20402AFLF/VY+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 MAX20402AFLF/VY+T reliable?
The price and inventory of MAX20402AFLF/VY+T 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+T is usually 5 days.
3.What payment methods are accepted for MAX20402AFLF/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20402AFLF/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20402AFLF/VY+T?
MAX20402AFLF/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20402AFLF/VY+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 MAX20402AFLF/VY+T?
For technical support, including MAX20402AFLF/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20402AFLF/VY+T requirements.
6.How does Aetrix verify that MAX20402AFLF/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20402AFLF/VY+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 MAX20402AFLF/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20402AFLF/VY+T?
All MAX20402AFLF/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20402AFLF/VY+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 MAX20402AFLF/VY+T part is unused and in its original packaging.
Return procedure for MAX20402AFLF/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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