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Analog Devices Inc./Maxim Integrated MAX20079EATP/VY+T
- Part No.:
- MAX20079EATP/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX20079EATP/VY+T.pdf
- Description:
- IC REG BUCK PROG/3V 20SWTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,987
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Product details
Overview
MAX20079EATP/VY+T from Analog Devices is an automotive-grade synchronous buck converter with integrated high-side and low-side MOSFETs, delivering up to 3.5A output current across a 3V–36V input range while consuming only 3.5μA quiescent current at no load. It features ±2% output voltage accuracy (3.3V/5V fixed or 3V–12V programmable), 2.1MHz/400kHz selectable switching frequency, and AEC-Q100 qualification for under-hood automotive power rails.
For engineers reviewing the MAX20079EATP/VY+T datasheet, MAX20079EATP/VY+T pinout, MAX20079EATP/VY+T application, or MAX20079EATP/VY+T equivalent, key selection criteria include its 65ns minimum on-time for high VIN/VOUT ratios, 40V load-dump tolerance, 99% dropout duty cycle, spread-spectrum EMI reduction via SPS pin, and side-wettable 20-pin TQFN package optimized for thermal and EMI performance in space-constrained automotive modules.
Technical Context
The MAX20079EATP/VY+T implements a current-mode control architecture with internal slope compensation, eliminating external compensation components. Its dual-frequency capability (2.1MHz for compact size and AM-band immunity, or 400kHz for peak efficiency) is selected via SYNC pin logic state-ground/unconnected enables skip mode, BIAS-connected forces PWM mode.
It integrates a 5V internal BIAS LDO, undervoltage lockout (2.725V typ), thermal shutdown (175°C), and overcurrent protection (4.7A typ peak limit). The PGOOD output provides active-high monitoring with 92–95% threshold hysteresis, and the symmetrical 4mm × 4mm SWTQFN layout enables balanced high-frequency current loops for superior radiated EMI suppression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +3V to +36V continuous; withstands +40V transients (load-dump protection) |
| Output Current | Up to 3.5A DC; peak current limit 4.7A ±12% (enables robust short-circuit response) |
| Quiescent Current | 3.5μA at no load (enables >10-year battery standby in always-on automotive modules) |
| Switching Frequency | 2.1MHz (typ) or 400kHz (typ); fixed internally, selected by SYNC pin logic level |
| Output Voltage Accuracy | ±2% over +6V to +18V input range (ensures stable microcontroller/core voltage under nominal battery conditions) |
| Minimum On-Time | 65ns (typ); enables 12V→3.3V conversion at 2.1MHz without pulse-skipping instability) |
| Operating Temperature | −40°C to +125°C ambient (AEC-Q100 Grade 1 qualified for engine compartment deployment) |
Pinout & Package
The MAX20079EATP/VY+T is housed in a 4mm × 4mm, 20-pin Side-Wettable TQFN (SWTQFN) package with exposed thermal pad, optimized for automated optical inspection (AOI) and thermal dissipation in high-reliability automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | High-voltage enable input | Accepts 3.3V–36V logic; no internal pullup/pulldown (minimizes system-level leakage) |
| BST | Bootstrap supply for high-side gate driver | Requires 0.1μF ceramic capacitor to LX; enables efficient 100% duty-cycle operation in dropout |
| SUP (Pins 4,5,11) | Main input power supply | Three parallel pins reduce IR drop and improve EMI; requires 4.7μF ceramic bypass per pin |
| LX (Pins 8,9) | Switching node | Connects to inductor; internal clamp diodes to PGND/AGND/SUP require careful transient management |
| FB | Feedback input | 1.0V reference (±1.5%); connects to BIAS for fixed 3.3V/5V, or resistor divider for 3V–12V programming |
| BIAS | Internal 5V bias supply output | Supplies internal circuitry and external pullups (e.g., PGOOD); requires ≥1μF ceramic capacitor to AGND |
| PGOOD | Open-drain power-good indicator | Active-high; 92–95% VOUT threshold with 60–110μs debounce (supports reliable power sequencing) |
| SYNC | Mode control / synchronization input | Ground/unconnected = skip mode; BIAS = forced PWM; supports external clock injection up to 500kHz |
| SPS | Spread-spectrum enable | Logic-high enables ±3% frequency modulation (reduces peak EMI emissions without affecting regulation) |
| PGND (Pins 7,10,16,19) | Power ground return | Four dedicated pins minimize ground bounce; must be tied directly to exposed thermal pad |
| AGND | Analog ground reference | Separate from PGND to isolate sensitive feedback/control paths; connects to FB and SYNC/SPS inputs |
| OUT | Regulated output voltage sense | Connects to output capacitor bank; bypassed to PGND with low-ESR ceramics for transient response |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck with integrated FETs | Eliminates external MOSFETs and drivers; RDS(on) = 70mΩ (HS/LS) enables >92% efficiency at 3.5A |
| Ultra-low IQ standby mode | 3.5μA at no load extends battery life in always-on systems (e.g., telematics, ADAS sensors) |
| 65ns minimum on-time | Supports 12V→3.3V conversion at 2.1MHz without subharmonic oscillation or forced skip mode |
| Side-wettable TQFN package | Enables AOI-compatible solder joint inspection and 2°C/W θJC thermal resistance for under-hood reliability |
| Programmable soft-start | Fixed 3.5ms (2.1MHz) or 5.5ms (400kHz) ramp prevents inrush current during cold cranking |
| 40V load-dump protection | Withstands ISO 7637-2 Pulse 5a transients without external TVS, reducing BOM count and board area |
Applications
| Automotive Infotainment Power Rail | ADAS Camera Module Supply |
|---|---|
|
Use Scenario: Powers SoC, DDR memory, and display interface in head-unit systems exposed to cold-crank (4.5V) and load-dump (40V) events. IC Role / Device Role / Timing Role: Primary 5V/3.3V buck regulator with PGOOD sequencing and thermal shutdown. Use Value: 3.5μA IQ ensures <10μA system standby current; 99% duty cycle maintains regulation during cold crank. |
Use Scenario: Supplies image sensor and ISP in rear-view or surround-view cameras mounted near engine bay. IC Role / Device Role / Timing Role: High-efficiency, low-noise 3.3V source with spread-spectrum EMI control for CISPR 25 Class 5 compliance. Use Value: 2.1MHz operation avoids AM band; symmetrical layout + dual SUP/LX pins suppress radiated emissions below 100MHz. |
| Industrial CAN Gateway Power | Electric Power Steering (EPS) MCU Supply |
|
Use Scenario: Provides isolated 5V rail for CAN transceivers and microcontrollers in vehicle-to-infrastructure gateways. IC Role / Device Role / Timing Role: Input-filter tolerant buck with EN controlled by microcontroller wake-up signal. Use Value: 3V–36V input range accommodates wide industrial battery voltages; 400kHz option maximizes efficiency at 2A continuous load. |
Use Scenario: Delivers 3.3V to safety-critical EPS microcontroller requiring ASIL-B compliant power integrity. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 regulator with PGOOD monitoring and thermal shutdown for functional safety. Use Value: −40°C to +125°C operation and 175°C thermal shutdown ensure reliability in high-ambient EPS housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRHFRQ1 | 4.5V–36V input, 8A output, 15μA IQ, 2.1MHz fixed, no spread-spectrum, QFN-16 | Higher current capacity but larger solution size and higher quiescent current; lacks SPS pin and side-wettable leads | Choose when >3.5A output or simpler thermal design is required; avoid if ultra-low IQ or AOI inspection is critical |
| TPS543B20RTWR | 4.5V–18V input, 3A output, 12μA IQ, 400kHz–2.2MHz adjustable, PMBus interface, 20-pin QFN | Digital control adds complexity and cost; narrower input range excludes 24V industrial use; no load-dump rating | Choose for programmable voltage/sequencing in non-automotive industrial systems; not suitable for 36V automotive or 40V transients |
Compared with LM61480QRHFRQ1 and TPS543B20RTWR, the MAX20079EATP/VY+T uniquely combines AEC-Q100 Grade 1 qualification, 3.5μA IQ, 40V transient tolerance, and side-wettable packaging-making it the only option qualified for space-constrained, always-on automotive power rails requiring zero-layout rework for AOI and thermal reliability.
Availability
MAX20079EATP/VY+T is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and electric power steering systems requiring stable component supply across extended temperature and transient-voltage conditions.
Supply support for MAX20079EATP/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 MAX20079EATP/VY+T belongs to Analog Devices' automotive power management portfolio, designed specifically for high-reliability, low-IQ DC-DC conversion in engine compartment and ADAS applications where AEC-Q100 compliance, EMI robustness, and thermal resilience are mandatory.
FAQ
What is the maximum duty cycle supported by the MAX20079EATP/VY+T?
The MAX20079EATP/VY+T supports up to 99% duty cycle operation, enabling it to maintain regulated output voltage during automotive cold-crank conditions (as low as 3V input) without dropping out. This capability is achieved through adaptive gate drive and BST capacitor recharge timing, verified across −40°C to +125°C ambient temperatures per AEC-Q100 testing.
Does the MAX20079EATP/VY+T require external compensation components?
No, the MAX20079EATP/VY+T uses an internally compensated current-mode control architecture with fixed slope compensation, eliminating the need for external compensation networks. This simplifies design, reduces BOM count, and ensures stable loop response across all operating conditions-including 3V–36V input and 3.3V–12V output configurations-without user tuning.
How is spread-spectrum modulation enabled on the MAX20079EATP/VY+T?
Spread-spectrum modulation on the MAX20079EATP/VY+T is enabled by driving the SPS pin logic-high (≥1.4V), which modulates the internal oscillator frequency by ±3%. This feature operates only when the device uses its internal clock (SYNC unconnected or grounded); it does not interfere with externally synchronized operation and is confirmed to reduce peak radiated EMI by up to 10dB in CISPR 25 testing.
What is the recommended output capacitor for the MAX20079EATP/VY+T at 2.1MHz operation?
For 2.1MHz operation, the MAX20079EATP/VY+T recommends a nominal 35μF output capacitance (minimum 25μF after voltage derating), using low-ESR ceramic capacitors placed symmetrically around the OUT and PGND pins. This value ensures >60° phase margin, meets fast transient response requirements for automotive microcontrollers, and minimizes output voltage deviation during 1A step loads.
Is the MAX20079EATP/VY+T pin-compatible with other devices in the MAX20079 family?
Yes, all MAX20079 variants-including MAX20079EATP/VY+T, MAX20079BATP/VY+, and MAX20079AATP/VY+-share identical 20-pin SWTQFN pinout, electrical characteristics, and thermal footprint. Differences are limited to factory-trimmed output voltage (3.3V, 5V, or 3.395V) and switching frequency option (2.1MHz or 400kHz), allowing drop-in replacement within the same package variant without PCB changes.
MAX20079EATP/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3V (3.3V)
- Voltage - Output (Max):
- 12V
- Current - Output:
- 3.5A
- 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:
- 20-SWTQFN (4x4)
MAX20079EATP/VY+T FAQ
1.How can I place an order for MAX20079EATP/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20079EATP/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 MAX20079EATP/VY+T reliable?
The price and inventory of MAX20079EATP/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 MAX20079EATP/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20079EATP/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20079EATP/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20079EATP/VY+T?
MAX20079EATP/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20079EATP/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 MAX20079EATP/VY+T?
For technical support, including MAX20079EATP/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20079EATP/VY+T requirements.
6.How does Aetrix verify that MAX20079EATP/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20079EATP/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 MAX20079EATP/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20079EATP/VY+T?
All MAX20079EATP/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20079EATP/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 MAX20079EATP/VY+T part is unused and in its original packaging.
Return procedure for MAX20079EATP/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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