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Analog Devices Inc./Maxim Integrated MAX20499AFOB/VY+T
- Part No.:
- MAX20499AFOB/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX20499AFOB/VY+T.pdf
- Description:
- IC REG BUCK PROG 8A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,226
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Product details
Overview
MAX20499AFOB/VY+T from Analog Devices is an AEC-Q100 Grade 1 automotive synchronous step-down converter delivering up to 8A peak output current, operating from 3.0V–5.5V input to 0.5V–1.275V output with ±1.5% voltage 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 low-RDS(ON) FETs for high efficiency in SoC core power applications.
For engineers reviewing the MAX20499AFOB/VY+T datasheet, MAX20499AFOB/VY+T pinout, MAX20499AFOB/VY+T application, or MAX20499AFOB/VY+T equivalent, key selection criteria include its 3.5mm × 3.75mm 17-pin FC2QFN package, differential remote sensing capability, spread-spectrum EMI reduction, programmable soft-start, and RESET output with configurable hold time.
Technical Context
The MAX20499AFOB/VY+T implements current-mode control with forced-PWM operation and supports synchronization via its bidirectional SYNC pin. Its internal architecture integrates an 8-bit DAC for I²C-programmable output voltage, dual compensation networks for stability across wide output capacitor ranges, and a dedicated UV/OV comparator with 15µs propagation delay.
It employs a high-side nMOS switch (8mΩ typical RDS(ON)) and low-side nMOS switch (4mΩ typical) optimized for 8A continuous operation. Thermal shutdown activates at +165°C with 15°C hysteresis, and overcurrent protection uses valley-current limiting with factory-trimmed thresholds of 11A–17A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 8A peak - supports demanding SoC core rails without external current sharing |
| Input Voltage Range | 3.0V to 5.5V - compatible with automotive 3.3V/5V supply domains and battery-backed systems |
| Output Voltage Range | 0.5V to 1.275V in 6.25mV steps - enables precise DVS for processor DVFS schemes |
| Voltage Accuracy | ±1.5% over load/line/temp - ensures stable core voltage under transient and thermal stress |
| Switching Frequency | 2.2MHz (default) or 1.1MHz - allows compact all-ceramic filter design and minimizes EMI filtering area |
| Package | 3.5mm × 3.75mm, 17-pin FC2QFN with side-wettable leads - supports automated optical inspection (AOI) and high-reliability automotive reflow |
| Temperature Range | −40°C to +125°C ambient - qualified per AEC-Q100 Grade 1 for in-cabin automotive environments |
Pinout & Package
MAX20499AFOB/VY+T is housed in a 3.5mm × 3.75mm, 17-pin FC2QFN package with side-wettable leads for solder joint inspection. The exposed thermal pad (pins 4, 5, 7, 8, 10, 11, 14, 16) connects to PGND for optimal thermal performance and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Active-high enable input | Initiates soft-start on rising edge; triggers controlled shutdown on falling edge - enables sequencing with system power controllers |
| BST | Bootstrap capacitor connection | Supplies gate drive for high-side FET; requires 0.1µF ceramic capacitor to LX - critical for maintaining 100% duty cycle capability |
| PV (pins 3, 9, 15) | Main power input supply | Accepts 3.0V–5.5V input; multiple pins reduce IR drop and improve current sharing - must be decoupled with ≥10µF ceramic per PV pin |
| PGND (pins 4, 5, 7, 8, 10, 11, 14, 16) | Power ground return | Low-impedance path for high di/dt switching currents; shared with LX and PV decoupling - requires solid copper pour beneath package |
| LX | Switch node connection | Drives external inductor; connects directly to internal HS/LS FETs - layout must minimize loop area to reduce EMI and voltage ringing |
| RS+, RS− | Differential remote sense inputs | Enable Kelvin sensing of VOUT at load point - eliminates PCB trace IR drop error for tight regulation at SoC pads |
| SYNC | Sync I/O pin | Configurable as input (for master clock sync) or open-drain output (for daisy-chained converters) - supports multi-phase interleaving |
| RESET | Open-drain power-good output | Asserts low until VOUT reaches regulation and holds for programmable timeout (0.5ms–14.9ms) - used for processor reset coordination |
| SDA / SCL | I²C serial interface | Supports up to 1MHz clock; 7-bit address range 0x38–0x3F - enables real-time DVS, telemetry, and fault logging in automotive ECUs |
Key Features
| Feature | Design Value |
|---|---|
| Differential Remote Sensing | Compensates for up to 100mV PCB trace IR drop, enabling ±1.5% regulation accuracy at the SoC power pin |
| Spread-Spectrum Modulation | Reduces peak radiated emissions by >10dB across 2.2MHz fundamental, easing CISPR 25 Class 5 compliance |
| Programmable Compensation | Allows tuning of loop response via external RC network on COMP pin - supports 10µF–150µF output capacitors without instability |
| I²C Dynamic Voltage Scaling | Enables software-controlled VDD scaling during CPU frequency transitions, reducing dynamic power by up to 30% in burst-mode workloads |
| Valley-Current Overcurrent Protection | Detects short-circuit faults within 2 switching cycles and latches off - prevents thermal runaway during load dump or board fault conditions |
Applications
| Automotive Infotainment SoC Power | ADAS Domain Controller Core Rail |
|---|---|
Use Scenario: Powers application processors (e.g., Qualcomm SA8155P, NXP i.MX 8QuadMax) in head units requiring dynamic voltage/frequency scaling. IC Role / Device Role / Timing Role: Primary buck regulator delivering 0.8V–1.2V core voltage with I²C-controlled DVS and fast load-transient response. Use Value: Enables sub-100ns VDD ramp during CPU wake-up, meeting ARM big.LITTLE transition timing requirements while maintaining <±15mV droop. | Use Scenario: Supplies vision processor cores (e.g., NVIDIA Orin, TI TDA4VM) in camera radar fusion ECUs with strict EMI limits. IC Role / Device Role / Timing Role: High-current, low-noise point-of-load regulator with spread-spectrum modulation and differential sensing. Use Value: Achieves CISPR 25 Class 5 radiated emissions margin without ferrite beads, reducing BOM cost and board space by 35% vs discrete solutions. |
| Automotive Digital Cockpit GPU Supply | Telematics Control Unit (TCU) Application Processor |
Use Scenario: Delivers 0.95V @ 6A to GPU subsystems (e.g., Mali-G78, Adreno 650) in digital instrument clusters with high ambient temperature. IC Role / Device Role / Timing Role: Thermally robust buck converter with −40°C to +125°C operation and thermal foldback. Use Value: Maintains full 8A output capability at +105°C ambient due to 6°C/W θJC and exposed thermal pad, eliminating need for airflow or heatsinks. | Use Scenario: Powers LTE/5G modem SoCs (e.g., Qualcomm Snapdragon Automotive 4G/5G) in TCUs requiring secure boot and firmware update support. IC Role / Device Role / Timing Role: I²C-configurable power rail with RESET assertion synchronized to VOUT regulation and programmable timeout. Use Value: Guarantees clean power-on reset sequence for modem firmware execution, preventing boot failures during cold cranking (4.5V battery dip). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4436AGL-A | 4A rated, 2.2MHz, no I²C interface, no remote sensing, smaller 3mm × 4mm QFN | Suitable for non-automotive consumer SoC rails where DVS and precision sensing are not required | Select when cost sensitivity outweighs need for automotive qualification, programmability, or 8A capability |
| TPS546D24RQF | 10A rated, PMBus interface, 3.3V–16V input, larger 5mm × 5.5mm QFN, higher quiescent current | Targeted at industrial servers and telecom with wider VIN and digital telemetry needs | Select when input exceeds 5.5V or PMBus telemetry (rail voltage/current/temp) is mandatory |
Compared with MPQ4436AGL-A and TPS546D24RQF, the MAX20499AFOB/VY+T uniquely balances AEC-Q100 Grade 1 qualification, 8A output, I²C-based DVS, and differential sensing in a compact FC2QFN - making it optimal for automotive SoC core rails where size, EMI, and dynamic power management are co-constrained.
Availability
MAX20499AFOB/VY+T is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS domain controllers, and digital cockpit electronics requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for MAX20499AFOB/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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The MAX20499 family was designed specifically for automotive SoC core power delivery, emphasizing AEC-Q100 reliability, low EMI, and I²C-based dynamic voltage scaling to meet evolving processor power management requirements.
FAQ
What is the factory-preset output voltage of the MAX20499AFOB/VY+T?
The MAX20499AFOB/VY+T has a factory-preset output voltage of 0.8V. This value is set at wafer test and can be dynamically adjusted via the I²C interface across the full 0.5V–1.275V range in 6.25mV increments. The preset voltage is stored in one-time-programmable (OTP) memory and remains active until overwritten by host firmware.
Does the MAX20499AFOB/VY+T support synchronization with other converters?
Yes, the MAX20499AFOB/VY+T supports synchronization through its bidirectional SYNC pin. When configured as an input, it locks switching to an external clock (1.1MHz or 2.2MHz). When configured as an output (via CONFIG.SO[1:0] = 2'b10), it drives SYNC to coordinate phase alignment with other MAX20499 devices - enabling interleaved operation to reduce input/output ripple.
What is the thermal resistance (θJA) of the MAX20499AFOB/VY+T on a four-layer PCB?
The MAX20499AFOB/VY+T exhibits a junction-to-ambient thermal resistance (θJA) of 26°C/W when mounted on a standard four-layer PCB with 2oz copper and optimized thermal vias under the exposed pad. This value assumes JEDEC JESD51-7 test conditions and enables full 8A operation at +105°C ambient without derating.
How does the differential remote sensing (RS+/RS−) improve regulation accuracy in the MAX20499AFOB/VY+T?
The MAX20499AFOB/VY+T uses differential remote sensing to measure output voltage directly at the load, rejecting voltage drop across PCB traces and connectors. This achieves ±1.5% regulation accuracy at the SoC power pins - a 5× improvement over single-point sensing - critical for processors with tight VDD tolerance (e.g., ±25mV at 0.8V).
Is the MAX20499AFOB/VY+T pin-compatible with other variants in the MAX20499 family?
No, the MAX20499AFOB/VY+T is not pin-compatible with MAX20499B variants (e.g., MAX20499BFOB/VY+T). While both share the same 17-pin FC2QFN package and pinout, the MAX20499B is rated for 12A peak output and uses different internal current-limit thresholds (15A–22A vs. 11A–17A). Electrical validation is required before substitution.
MAX20499AFOB/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 17-PowerWFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 1.275V
- Current - Output:
- 8A
- Frequency - Switching:
- 1.1MHz, 2.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 17-FC2QFN (3.5x3.75)
MAX20499AFOB/VY+T FAQ
1.How can I place an order for MAX20499AFOB/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20499AFOB/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 MAX20499AFOB/VY+T reliable?
The price and inventory of MAX20499AFOB/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 MAX20499AFOB/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20499AFOB/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20499AFOB/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20499AFOB/VY+T?
MAX20499AFOB/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20499AFOB/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 MAX20499AFOB/VY+T?
For technical support, including MAX20499AFOB/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20499AFOB/VY+T requirements.
6.How does Aetrix verify that MAX20499AFOB/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20499AFOB/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 MAX20499AFOB/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20499AFOB/VY+T?
All MAX20499AFOB/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20499AFOB/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 MAX20499AFOB/VY+T part is unused and in its original packaging.
Return procedure for MAX20499AFOB/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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