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Analog Devices Inc./Maxim Integrated MAX20499DAFOA/VY+
- Part No.:
- MAX20499DAFOA/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX20499DAFOA/VY+.pdf
- Description:
- IC REG BUCK 0.85V 12A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:549
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Product details
Overview
MAX20499DAFOA/VY+ from Analog Devices is an automotive-grade synchronous step-down converter delivering up to 12A peak output current, operating from 3.0V–5.5V input to generate 0.5V–1.275V output with ±1.5% accuracy over load, line, and temperature. It features I²C-controlled dynamic voltage scaling in 6.25mV steps, 2.2MHz fixed-frequency PWM operation, and integrated high- and low-side MOSFETs (RDS(ON) = 6.8mΩ / 4mΩ) for high-efficiency point-of-load power delivery in SoC core rails.
For engineers reviewing the MAX20499DAFOA/VY+ datasheet, MAX20499DAFOA/VY+ pinout, MAX20499DAFOA/VY+ application, or MAX20499DAFOA/VY+ equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade thermal performance (−40°C to +125°C), differential remote sensing capability, and real-world alternative selection guidance - all grounded in Analog Devices' official documentation and package specifications.
Technical Context
The MAX20499DAFOA/VY+ implements a current-mode, forced-PWM control architecture with programmable compensation and spread-spectrum frequency modulation to reduce EMI. Its internal 8-bit DAC enables precise I²C-adjustable output voltage across 129 discrete steps (0.5V–1.275V @ 6.25mV resolution).
It integrates dual N-channel MOSFETs with factory-trimmed RDS(ON), supports differential remote voltage sensing (RS+/RS−), and delivers RESET assertion with programmable timeout (default 3.7ms). The device operates in either 2.2MHz or 1.1MHz fixed-frequency mode via CONFIG.FSW register bit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 12A peak (MAX20499D variant); enables single-chip core power for mid-tier automotive SoCs without external current sharing. |
| Input Voltage Range | 3.0V–5.5V; compatible with automotive 5V rail and post-LDO 3.3V/5V supplies, eliminating need for pre-regulation stages. |
| Output Voltage Range | 0.5V–1.275V in 6.25mV steps; supports dynamic voltage scaling for ARM Cortex-A7x/A8x and similar processors requiring fine-grained VDD control. |
| Switching Frequency | 2.2MHz (default) or 1.1MHz; allows use of compact 0805/1206 ceramic inductors and eliminates bulk electrolytic capacitors. |
| Voltage Accuracy | ±1.5% over full load/line/temp range; ensures stable SoC operation under worst-case thermal and supply conditions without margining. |
| Thermal Rating | Grade 1 automotive: −40°C to +125°C ambient; qualified for engine bay–adjacent and infotainment module mounting locations. |
| Protection Features | Overcurrent (15–22A trip), overtemperature shutdown (165°C), short-circuit, UV/OV detection, and soft-start/soft-shutdown sequencing. |
Pinout & Package
MAX20499DAFOA/VY+ uses a 3.5mm × 4mm, 17-pin side-wettable FC2QFN package (package code F173A4FY+1) with exposed pad internally connected to PV. This thermally enhanced layout supports high-current routing and automated optical inspection (AOI) of solder joints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Active-high enable input | Starts soft-start on rising edge; initiates controlled soft-shutdown on falling edge - critical for power sequencing in multi-rail systems. |
| BST | Bootstrap supply | Provides gate drive voltage for high-side NMOS; requires 0.1µF ceramic capacitor to LX for reliable 12A switching. |
| PV (pins 3,9,16) | Main power input | Multiple parallel pins reduce IR drop and inductance; must be decoupled with ≥10µF ceramic per pin to PGND. |
| PGND (pins 4,5,7,8) | Power ground return | Low-inductance path for high di/dt currents; all pins must be tied together with wide copper pours to minimize noise coupling. |
| LX (pin 6) | Switch node | Connects directly to inductor; high dv/dt node requiring tight layout and minimized loop area to suppress EMI. |
| RS+, RS− (pins 10,11) | Differential remote sense inputs | Enable accurate regulation at load point by rejecting PCB trace IR drop; RS+ impedance ≤2Ω required for ±1.5% accuracy. |
| SYNC (pin 12) | Synchronization I/O | Configurable as input (for master clock sync) or output (to daisy-chain multiple converters); supports 1.8–2.6MHz external clocks. |
| RESET (pin 13) | Open-drain power-good signal | Asserts low until output reaches regulation + programmed hold time (default 3.7ms); requires external pull-up for logic-level interface. |
| AV (pin 15) | Analog supply | Separate 3.0–5.5V analog rail for precision reference and I²C circuitry; improves noise immunity vs. shared PV. |
| SDA/SCL (pins 16,17) | I²C bidirectional data/clock | Supports up to 1MHz clock rate; SDA is open-drain requiring ≥500Ω pull-up; SCL is input-only with internal 100kΩ pull-down. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 6.8mΩ/4mΩ MOSFETs | Eliminates external power stage components, reduces board area by >40%, and improves efficiency above 85% at 12A/1V. |
| I²C voltage programming (6.25mV steps) | Enables firmware-controlled DVS for adaptive power management in Linux-based automotive head units and ADAS SoCs. |
| Differential remote sensing | Compensates for up to 60mV IR drop across PCB traces, maintaining ±1.5% output accuracy even with 2-inch routing to processor VDD pins. |
| Spread-spectrum modulation | Reduces peak radiated emissions by >10dB at 2.2MHz fundamental, easing CISPR 25 Class 5 compliance without added shielding. |
| Programmable soft-start time | Prevents inrush current surges during cold start; configurable via register to avoid brown-out in 12V battery systems with weak alternators. |
Applications
| Automotive Infotainment SoC Core Rail | ADAS Domain Controller LDO Replacement |
|---|---|
|
Use Scenario: Powering ARM Cortex-A76/A78 cores in next-gen automotive head units with dynamic frequency scaling. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 12A peak current at 0.85V with <10µs load-transient response. Use Value: Replaces discrete buck + LDO cascade, reducing BOM count by 7 parts and improving PSRR by 20dB at 100kHz. |
Use Scenario: Supplying vision processor SoCs (e.g., NVIDIA Orin, Qualcomm SA8540P) in camera fusion modules. IC Role / Device Role / Timing Role: High-current, low-noise core supply with differential sensing to maintain voltage stability across long flex PCB runs. Use Value: Enables 100% duty-cycle operation during sustained AI inference bursts while meeting ISO 26262 ASIL-B timing constraints. |
| Telematics Control Unit (TCU) Application Processor | Automotive Ethernet Switch PHY Power |
|
Use Scenario: Providing regulated 1.1V core voltage to LTE/5G modems and application processors in telematics gateways. IC Role / Device Role / Timing Role: Synchronous buck converter with I²C-programmable slew rate for seamless voltage transitions during modem sleep/wake cycles. Use Value: Reduces wake-up latency by 15% versus fixed-output solutions through coordinated DVS with host MCU firmware. |
Use Scenario: Powering multi-port automotive Ethernet PHYs (e.g., Broadcom BCM54390, Marvell Alaska) requiring clean 1.0V/1.2V rails. IC Role / Device Role / Timing Role: Low-EMI, high-PWM-frequency regulator minimizing noise coupling into 100BASE-T1/1000BASE-T1 signal paths. Use Value: Achieves <−65dBc ripple at 2.2MHz, preventing PHY link flapping and enabling >99.9% packet success rate in ECU-to-ECU comms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current automotive buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4333GQ-AEC1 | 12A peak, 2.2MHz, but lacks I²C interface and differential sensing; ±2% accuracy; no spread spectrum. | Best suited for cost-sensitive, fixed-voltage applications where firmware control and precision remote sensing are unnecessary. | Select when system-level DVS is not required and layout space permits larger input/output capacitance for EMI filtering. |
| TPS62480QRVCTQ1 | 12A peak, 2.4MHz, includes I²C and remote sensing, but only ±2% accuracy and no spread-spectrum option; smaller 3.0mm × 4.0mm QFN. | Preferred for space-constrained clusters where footprint reduction outweighs EMI performance requirements. | Choose when board area is critical and CISPR 25 Class 5 compliance can be achieved via layout and shielding instead of spread spectrum. |
Compared with MPQ4333GQ-AEC1 and TPS62480QRVCTQ1, the MAX20499DAFOA/VY+ uniquely combines ±1.5% accuracy, I²C-programmable DVS in 6.25mV steps, and integrated spread-spectrum modulation - making it the only option among the three capable of meeting stringent automotive SoC core rail requirements without external compensation or EMI mitigation components.
Availability
MAX20499DAFOA/VY+ is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS domain controllers, and telematics control units requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for MAX20499DAFOA/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 with precision power, sensing, and connectivity solutions.
The MAX20499 series belongs to Analog Devices' automotive power management portfolio, designed specifically for high-current, low-noise, I²C-configurable DC-DC conversion in safety-critical vehicle subsystems operating across Grade 1 temperature range.
FAQ
What is the maximum output current rating for MAX20499DAFOA/VY+?
The MAX20499DAFOA/VY+ is the MAX20499D variant, rated for 12A peak output current. This is confirmed in the datasheet's Benefits and Features section and Electrical Characteristics table (HS NMOS current-limit threshold: 15–22A for MAX20499D). It is distinct from the MAX20499C (16A) variant and must not be substituted without verifying thermal derating and layout adequacy for the target load profile.
Does MAX20499DAFOA/VY+ support differential remote voltage sensing?
Yes, MAX20499DAFOA/VY+ supports differential remote sensing via dedicated RS+ (pin 11) and RS− (pin 10) inputs. As specified in the Pin Descriptions and Applications Information sections, this feature compensates for PCB trace resistance between the IC and load, maintaining ±1.5% output accuracy even with up to 60mV IR drop - essential for SoC core rail stability.
What I²C address does MAX20499DAFOA/VY+ use by default?
The MAX20499DAFOA/VY+ uses a factory-programmed 7-bit I²C address within the range 0x38–0x3F, as stated in the I²C Interface section. The exact address is defined in the Ordering Information table of the datasheet and varies by part number suffix; users must consult the specific device's ordering information or read the DEVICE_ID register (0x00) to confirm the active address.
Can MAX20499DAFOA/VY+ operate at 1.1MHz switching frequency?
Yes, MAX20499DAFOA/VY+ supports dual-frequency operation: 2.2MHz (default) and 1.1MHz, selected via the CONFIG.FSW register bit. The Electrical Characteristics table confirms fSW = 1.0–1.2MHz when CONFIG.FSW = 1. This lower frequency improves efficiency at light loads and relaxes inductor size constraints, though it increases output capacitor requirements.
Is MAX20499DAFOA/VY+ qualified for automotive Grade 1 temperature operation?
Yes, MAX20499DAFOA/VY+ is explicitly rated for −40°C to +125°C ambient temperature (Grade 1), as stated in the Benefits and Features list and Recommended Operating Conditions table. Its junction temperature is designed for continuous operation up to +150°C, supporting placement near heat-generating components in modern automotive ECUs without thermal throttling.
MAX20499DAFOA/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):
- 3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.85V
- Voltage - Output (Max):
- -
- Current - Output:
- 12A
- Frequency - Switching:
- 1.1MHz, 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 17-FC2QFN (3.5x4)
MAX20499DAFOA/VY+ FAQ
1.How can I place an order for MAX20499DAFOA/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20499DAFOA/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 MAX20499DAFOA/VY+ reliable?
The price and inventory of MAX20499DAFOA/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20499DAFOA/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20499DAFOA/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20499DAFOA/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20499DAFOA/VY+?
MAX20499DAFOA/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20499DAFOA/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 MAX20499DAFOA/VY+?
For technical support, including MAX20499DAFOA/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20499DAFOA/VY+ requirements.
6.How does Aetrix verify that MAX20499DAFOA/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20499DAFOA/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 MAX20499DAFOA/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20499DAFOA/VY+?
All MAX20499DAFOA/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20499DAFOA/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 MAX20499DAFOA/VY+ part is unused and in its original packaging.
Return procedure for MAX20499DAFOA/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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