My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX20403AFLB/VY+
- Part No.:
- MAX20403AFLB/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-WFQFN
- Datasheet:
-
MAX20403AFLB/VY+.pdf
- Description:
- IC REG BUCK 3.3V 3.5A 15FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:390
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX20403AFLB/VY+ from Analog Devices is an automotive-grade, fully integrated synchronous buck converter with Silent Switcher® architecture, delivering up to 3.5A output at 3.3V fixed output voltage across a 3V–36V input range. It features 2.1MHz switching frequency, ±6% spread-spectrum modulation, 10μA quiescent current in skip mode, and AEC-Q100 qualification for radar modules and ADAS power rails.
For engineers reviewing the MAX20403AFLB/VY+ datasheet, MAX20403AFLB/VY+ pinout, MAX20403AFLB/VY+ application, or MAX20403AFLB/VY+ equivalent, key selection criteria include its 3.3V fixed output, 2.1MHz/±6% EMI-optimized operation, 99% dropout capability, FC2QFN-15 (3mm × 3mm) package, and integrated high-side/low-side FETs with 95mΩ/45mΩ RDS(ON).
Technical Context
The MAX20403AFLB/VY+ implements average current-mode control with internal slope compensation, enabling stable operation down to 0.8V output and supporting fast transient response via MAXQ® power architecture. Its symmetrical FC2QFN-15 layout minimizes magnetic field coupling, while the 2.1MHz fixed-frequency PWM mode ensures predictable EMI behavior without AM band interference.
It integrates a 1.8V BIAS LDO powered from SUP during startup and from VOUT thereafter, supports external synchronization via SYNC pin, and uses a fixed 2.5ms soft-start ramp. Protection includes overtemperature shutdown (175°C), hiccup-mode short-circuit response, and accurate windowed PGOOD with ±1.5% output voltage regulation in FPWM mode.
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 Voltage | Fixed 3.3V - eliminates external feedback resistors; ±1.5% accuracy over -40°C to +125°C |
| Max Output Current | 3.5A - enabled by low RDS(ON) (95mΩ HS / 45mΩ LS) and optimized thermal resistance (θJCb = 21.4°C/W) |
| Switching Frequency | 2.1MHz - enables compact 1.5μH inductor and <25μF effective output capacitance for minimal board area |
| Quiescent Current | 10μA in skip mode - extends battery runtime in always-on vehicle subsystems |
| EMI Mitigation | ±6% spread spectrum + symmetrical FC2QFN layout - meets CISPR 25 Class 5 without shielding or ferrites |
| Duty Cycle Max | 99% - sustains regulated 3.3V output even at 3.33V input (e.g., post-buck battery monitoring) |
Pinout & Package
Package: FC2QFN-15, 3mm × 3mm, 0.5mm pitch, exposed thermal pad (PGND-connected). Pin 1 marked by dot; pins 2 & 8 are NC; pins 4 & 6 are PGND; pins 3 & 7 are SUP; pin 10 is GND; pin 11 is BIAS; pin 13 is FB/OUT (configured as output sense for fixed 3.3V).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable input | High-voltage-tolerant (up to 42V); activates converter when pulled ≥0.9V; draws only 1μA leakage |
| SUP (pins 3,7) | High-side supply input | Power source for internal gate drivers; requires dual bypass (0.1μF + 2.2μF ceramic) per pin for EMI suppression |
| LX (pin 5) | Switch node | Connects to inductor; carries high di/dt; must be minimized in loop area to reduce radiated EMI |
| BST (pin 9) | Bootstrap capacitor terminal | Drives high-side FET gate; requires 0.1μF ceramic capacitor between BST and LX with short, wide traces |
| FB/OUT (pin 13) | Output voltage sense | For MAX20403AFLB/VY+, configured as output monitor (not feedback); connects directly to VOUT rail |
| PGOOD (pin 14) | Open-drain status signal | Asserts high when VOUT is within 93–105% of 3.3V; requires 20kΩ pull-up to BIAS or external supply |
| SYNC (pin 15) | Mode/frequency control | Pulled high → FPWM; pulled low → skip mode; driven externally → synchronizes to 1.7–2.6MHz clock |
| SPS (pin 12) | Spread-spectrum enable | Logic-high enables ±6% frequency dithering; disabled automatically during external sync |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Symmetrical FC2QFN-15 layout cancels magnetic fields, reducing peak radiated emissions by >20dB vs conventional QFN |
| MAXQ® power architecture | Delivers >85% efficiency at 1A–3.5A loads and ±1.5% output regulation without external compensation components |
| Automotive robustness | AEC-Q100 Grade 1 (−40°C to +125°C), 42V load-dump tolerant, and hiccup-mode short-circuit protection |
| Low-noise operation | 2.1MHz fixed frequency avoids AM radio band (530–1710kHz); spread spectrum further lowers EMI peaks by 10dB |
| Dropout performance | 99% duty cycle allows regulation down to VIN = 3.33V for 3.3V output - critical for start-stop and battery monitoring circuits |
Applications
| Radar Module Power Supply | ADAS Camera Core Rail |
|---|---|
Use Scenario: Powers 77GHz radar transceiver SoCs requiring clean, low-noise 3.3V at up to 3A with minimal EMI impact on RF front-end. IC Role / Device Role / Timing Role: Primary DC-DC regulator supplying core logic and ADC reference voltage; operates in forced-PWM to suppress subharmonic noise. Use Value: ±1.5% output accuracy and 10μA quiescent current ensure precise sensor biasing and extended sleep-mode battery life. | Use Scenario: Supplies image signal processor (ISP) and MIPI interface in automotive surround-view cameras operating across wide temperature and input voltage ranges. IC Role / Device Role / Timing Role: Fixed-output buck converter providing stable 3.3V rail; uses PGOOD to sequence ISP boot and validate power integrity before frame capture. Use Value: 99% dropout capability maintains regulation during cold-crank (3V battery), preventing camera reset during engine start. |
| Infotainment System MCU Core | Automotive Gateway Microcontroller |
Use Scenario: Delivers 3.3V to application processors and memory interfaces in head-unit infotainment systems subject to load-dump transients. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator; leverages spread-spectrum mode to pass CISPR 25 Class 5 radiated emissions testing. Use Value: Integrated 3.5A FETs and 2.1MHz switching eliminate need for external MOSFETs and reduce solution size by 40% vs discrete controllers. | Use Scenario: Powers ARM Cortex-M7 microcontroller and CAN FD transceivers in domain controller gateways requiring functional safety compliance. IC Role / Device Role / Timing Role: Safety-critical power stage with windowed PGOOD and overtemperature shutdown; supports ASIL-B system-level diagnostics. Use Value: AEC-Q100 qualification and ±1.5% output accuracy enable use in ISO 26262-compliant power domains without additional monitoring circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62933RQWR | 3.3V fixed, 3.5A, 2.2MHz, no spread spectrum, 12-pin WQFN (2.5mm × 2.5mm) | Lacks CISPR 25 Class 5 compliance; smaller package but higher EMI requires filtering | Choose for space-constrained non-radar applications where EMI filtering is acceptable |
| MPQ4433AGL-A-Z | 3.3V fixed, 3.5A, 2.2MHz, no Silent Switcher, AEC-Q100 Grade 2 (−40°C to +105°C) | Lower junction temperature rating; no integrated spread spectrum or MAXQ architecture | Choose for cost-sensitive industrial or non-safety-critical automotive modules |
Compared with TPS62933RQWR and MPQ4433AGL-A-Z, the MAX20403AFLB/VY+ uniquely combines AEC-Q100 Grade 1, CISPR 25 Class 5 compliance, and 99% dropout in a single 3mm × 3mm FC2QFN package - making it the only option qualified for radar and high-reliability ADAS subsystems without external EMI mitigation.
Availability
MAX20403AFLB/VY+ is available at Aetrix Electronics and suitable for automotive radar modules, ADAS camera systems, and infotainment head-units requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for MAX20403AFLB/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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The MAX20403AFLB/VY+ belongs to the MAX20402/MAX20403 Silent Switcher® buck converter family, designed specifically for EMI-sensitive automotive power applications including radar, camera, and domain controller subsystems.
FAQ
What is the maximum continuous output current of the MAX20403AFLB/VY+?
The MAX20403AFLB/VY+ delivers up to 3.5A continuous output current at 3.3V with proper PCB thermal design (4-layer board, exposed thermal pad soldered to PGND plane). This rating assumes ambient temperature ≤+70°C and full derating above that per θJA = 40.6°C/W on EV kit layout. The device enters thermal shutdown at 175°C junction temperature.
Does the MAX20403AFLB/VY+ require external feedback resistors for its 3.3V output?
No. The MAX20403AFLB/VY+ is a fixed-output variant with internal 3.3V regulation; pin 13 (FB/OUT) functions solely as an output voltage sense input and must be connected directly to the VOUT rail. External resistor dividers are unnecessary and not supported for this part number.
How does the MAX20403AFLB/VY+ achieve CISPR 25 Class 5 compliance?
The MAX20403AFLB/VY+ achieves CISPR 25 Class 5 compliance through three integrated features: Silent Switcher® symmetrical FC2QFN-15 layout that cancels magnetic fields, ±6% spread-spectrum frequency modulation that lowers peak EMI by 10dB, and 2.1MHz fixed switching frequency that avoids the AM radio band entirely - all without requiring external shielding or ferrite beads.
Can the MAX20403AFLB/VY+ operate with a 3.33V input voltage and still regulate 3.3V output?
Yes. The MAX20403AFLB/VY+ supports 99% maximum duty cycle operation, enabling regulation at input voltages as low as 3.33V for a 3.3V output. This dropout capability is essential for automotive cold-crank conditions and battery monitoring circuits where input may dip near the output voltage.
What is the purpose of the SPS pin on the MAX20403AFLB/VY+?
The SPS (Spread Spectrum) pin on the MAX20403AFLB/VY+ enables or disables internal frequency dithering: logic-high activates ±6% triangular modulation of the 2.1MHz switching frequency to reduce radiated EMI peaks, while logic-low disables it. Spread spectrum is automatically disabled when SYNC is driven by an external clock.
MAX20403AFLB/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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 3.5A
- Frequency - Switching:
- 2.1MHz
- 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)
MAX20403AFLB/VY+ FAQ
1.How can I place an order for MAX20403AFLB/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20403AFLB/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 MAX20403AFLB/VY+ reliable?
The price and inventory of MAX20403AFLB/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20403AFLB/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20403AFLB/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20403AFLB/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20403AFLB/VY+?
MAX20403AFLB/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20403AFLB/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 MAX20403AFLB/VY+?
For technical support, including MAX20403AFLB/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20403AFLB/VY+ requirements.
6.How does Aetrix verify that MAX20403AFLB/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20403AFLB/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 MAX20403AFLB/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20403AFLB/VY+?
All MAX20403AFLB/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20403AFLB/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 MAX20403AFLB/VY+ part is unused and in its original packaging.
Return procedure for MAX20403AFLB/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX20403AFLB/VY+ 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…
