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Analog Devices Inc./Maxim Integrated MAX20079AATP/VY+
- Part No.:
- MAX20079AATP/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX20079AATP/VY+.pdf
- Description:
- IC REG BCK PROG 3.5A 20SWTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:450
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Product details
Overview
MAX20079AATP/VY+ 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 power conversion in engine control units and ADAS modules.
For engineers reviewing the MAX20079AATP/VY+ datasheet, MAX20079AATP/VY+ pinout, MAX20079AATP/VY+ application, or MAX20079AATP/VY+ equivalent, key selection criteria include its 65ns minimum on-time for high VIN/VOUT ratios, 40V load-dump protection, 99% dropout duty cycle, spread-spectrum EMI reduction via SPS pin, and side-wettable 20-pin TQFN package optimized for automotive thermal and noise constraints.
Technical Context
The MAX20079AATP/VY+ employs current-mode control with internal slope compensation and no external compensation required. Its architecture supports both forced-PWM (via SYNC pin tied to BIAS) and pulse-skipping modes, enabling dynamic efficiency optimization across light-to-heavy loads.
It integrates a 5V internal BIAS LDO, undervoltage lockout (2.725V typ), thermal shutdown (175°C), and overcurrent protection (4.7A peak limit). The device exits dropout with clamped error-amplifier discharge to suppress output overshoot, and uses symmetrical SUP pin placement to cancel magnetic fields and reduce radiated EMI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.5A continuous - supports automotive infotainment processors and radar SoCs without external current boosting. |
| Input Voltage Range | 3V to 36V - accommodates cold-crank (3V) and load-dump (40V transient) conditions per ISO 7637-2. |
| Quiescent Current | 3.5μA at no load - enables >10-year battery standby in always-on vehicle modules (e.g., telematics, gateway ECUs). |
| Switching Frequency | 2.1MHz (typ) or 400kHz (typ) - 2.1MHz enables <2.2μH inductors and compact 35μF ceramic output caps; 400kHz maximizes full-load efficiency. |
| Output Accuracy | ±2% over +6V to +18V input - ensures stable 5V/3.3V rail delivery to CAN transceivers and microcontrollers across battery voltage swings. |
| Minimum On-Time | 65ns (typ) - enables 12V→1.0V conversion at 2.1MHz without pulse skipping, critical for high-ratio point-of-load regulation. |
| Package | 20-pin Side-Wettable TQFN (4mm × 4mm) - supports automated optical inspection (AOI) and improves solder joint reliability in automotive reflow profiles. |
Pinout & Package
MAX20079AATP/VY+ is housed in a 20-pin Side-Wettable TQFN (SWTQFN) package measuring 4mm × 4mm with exposed thermal pad. The symmetrical layout of SUP (pins 4,5,11), PGND (pins 7,10), and LX (pins 8,9) minimizes loop area and enhances EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | High-voltage enable input | Accepts 3.3V–36V logic; enables direct connection to automotive KEY or CAN inhibit signals without level-shifting. |
| BST (Pin 2) | Bootstrap supply for high-side gate driver | Requires 0.1μF ceramic capacitor to LX; enables efficient 100% duty-cycle operation during dropout. |
| SUP (Pins 4,5,11) | Main input supply | Dual-path input routing reduces high-frequency ripple; each accepts 4.7μF ceramic decoupling for optimal EMI suppression. |
| LX (Pins 8,9) | Switch node | Connects to inductor; internal clamp diodes to PGND/AGND require careful layout to avoid exceeding thermal limits. |
| FB (Pin 13) | Feedback reference input | 1.0V (±1.5%) internal reference; connects to resistor divider for 3V–12V programming or to BIAS for fixed 3.3V/5V outputs. |
| BIAS (Pin 15) | Internal 5V bias supply | Powers internal circuitry; requires ≥1μF ceramic bypass to AGND; supplies PGOOD pullup and SYNC/SPS logic thresholds. |
| SYNC (Pin 17) | Mode control input | Ground or floating → skip mode; tied to BIAS → forced PWM; enables real-time efficiency/EMI tradeoff adjustment. |
| PGOOD (Pin 18) | Open-drain power-good indicator | Active-high signal debounced at 60–110μs; asserts when VOUT reaches 93% of nominal; requires external 10kΩ pullup. |
| SPS (Pin 20) | Spread-spectrum enable | Logic-high enables ±3% frequency modulation of internal oscillator - reduces peak EMI by >10dB without affecting SYNC synchronization. |
| PGND (Pins 7,10) | Power ground return | Low-impedance path for high-current switching loops; must be connected directly to exposed thermal pad. |
| AGND (Pin 12) | Analog ground reference | Separate from PGND to isolate sensitive feedback and oscillator circuits; joined at single-point near exposed pad. |
| OUT (Pin 14) | Regulated output voltage sense | Connects to output capacitor bank; bypassed to PGND with low-ESR ceramics to minimize transient droop during load steps. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-MOSFET power stage | 70mΩ high-side + 70mΩ low-side RDS(ON) - eliminates external FETs and gate drivers, reducing BOM count and PCB area by >40% vs discrete solutions. |
| Automotive-grade protection suite | 40V load-dump tolerance, -40°C to +125°C ambient operation, AEC-Q100 Grade 0 qualification - certified for front-end power in ADAS cameras and domain controllers. |
| Adaptive light-load efficiency | 3.5μA IQ in standby mode + automatic skip-mode entry below 600mA - extends battery life in always-on telematics without compromising wake-up response time. |
| EMI-optimized layout architecture | Symmetrical SUP/LX/PGND pin pairing + side-wettable leads - enables >6dB radiated emission reduction vs standard QFN, meeting CISPR 25 Class 5 requirements. |
| Programmable soft-start | Fixed 3.5ms (2.1MHz) / 5.5ms (400kHz) ramp - prevents inrush current damage to downstream capacitors and avoids false PGOOD assertion during cold-crank. |
Applications
| Engine Control Unit (ECU) Power Supply | ADAS Camera Module DC-DC |
|---|---|
|
Use Scenario: Provides stable 5V rail to MCU, CAN transceiver, and sensor interface in gasoline/diesel engine management systems exposed to wide temperature and voltage transients. IC Role / Device Role / Timing Role: Primary buck regulator converting 12V battery to 5V; handles cold-crank (3V) and load-dump (40V) events without reset or dropout. Use Value: 99% duty cycle maintains regulation during cranking; 3.5μA IQ preserves battery charge during extended parking; AEC-Q100 ensures 15-year field reliability. |
Use Scenario: Powers image signal processor (ISP) and MIPI serializer in forward-facing camera modules requiring low-noise, high-efficiency 3.3V supply. IC Role / Device Role / Timing Role: Point-of-load regulator with 2.1MHz switching to minimize inductor size; spread-spectrum mode suppresses EMI near high-speed video lines. Use Value: 65ns min-on-time enables 12V→3.3V conversion at 2.1MHz; symmetrical layout reduces coupling into MIPI clock lanes; PGOOD enables safe ISP boot sequencing. |
| Radar Sensor Power Management | Automotive Gateway ECU Core Supply |
|
Use Scenario: Delivers clean 3.3V to RF transceiver and DSP in 77GHz radar units operating in high-temperature engine bay environments. IC Role / Device Role / Timing Role: High-reliability buck converter with thermal shutdown (175°C) and overcurrent limiting (4.7A) to protect against antenna mismatch faults. Use Value: 40V load-dump rating withstands alternator surge; 5V BIAS rail powers radar's analog front-end; side-wettable package ensures solder joint integrity after thermal cycling. |
Use Scenario: Generates 5V core supply for multi-protocol gateway (CAN FD, Ethernet, LIN) managing communication between vehicle domains. IC Role / Device Role / Timing Role: Always-on primary regulator supporting sleep/wake transitions; EN pin controlled by vehicle wake-up bus (e.g., CAN or LIN). Use Value: Ultra-low 3.5μA IQ meets OEM <100μA total gateway sleep current targets; PGOOD synchronizes microcontroller reset with power stabilization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRTWRQ1 | 4.5V–36V input, 8A output, 15μA IQ, fixed 2.1MHz, no spread-spectrum, QFN-16 | Higher current, higher IQ, no SPS pin - suited for higher-power domain controllers but less optimal for ultra-low-IQ telematics. | Select LM61480QRTWRQ1 when >5A output or integrated PMBus telemetry is required; MAX20079AATP/VY+ preferred for IQ-sensitive always-on nodes. |
| TPS62933QPWRRQ1 | 3V–36V input, 3.5A output, 2.5μA IQ, 2.2MHz, spread-spectrum, WQFN-20 | Lower IQ, tighter output accuracy (±1%), same package footprint - offers marginal IQ advantage but lacks 40V load-dump rating. | Select TPS62933QPWRRQ1 for non-load-dump applications where sub-3μA IQ is critical; MAX20079AATP/VY+ remains optimal for full automotive transients. |
Compared with LM61480QRTWRQ1 and TPS62933QPWRRQ1, MAX20079AATP/VY+ uniquely balances 40V load-dump robustness, 3.5μA IQ, and spread-spectrum EMI control in a side-wettable package-making it the most suitable choice for cost-sensitive, space-constrained automotive power nodes requiring full ISO 7637-2 compliance.
Availability
MAX20079AATP/VY+ is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, radar sensors, and gateway ECUs requiring stable component supply with AEC-Q100 assurance and long-term production continuity.
Supply support for MAX20079AATP/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, Inc. 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 timing solutions.
The MAX20079AATP/VY+ belongs to Analog Devices' automotive power management portfolio, designed specifically for high-reliability, low-quiescent-current DC-DC conversion in harsh vehicle environments - emphasizing transient robustness, thermal resilience, and EMI control.
FAQ
What is the maximum input voltage transient tolerance for MAX20079AATP/VY+?
MAX20079AATP/VY+ supports 40V transient input voltage per ISO 7637-2 Pulse 5a (load-dump), verified across -40°C to +125°C ambient. This rating applies to the SUP pin and is sustained continuously without latch-off. The device remains functional during 40V events due to internal clamping and thermal derating design, making MAX20079AATP/VY+ suitable for direct battery connection in engine compartments.
Does MAX20079AATP/VY+ support adjustable output voltage, and what is the supported range?
Yes, MAX20079AATP/VY+ supports programmable output voltage from 3V to 12V using an external resistor divider connected to the FB pin. The internal feedback reference is precisely 1.0V (±1.5%), enabling accurate scaling. For fixed outputs, factory-trimmed 3.3V and 5V variants are available; MAX20079AATP/VY+ itself is configured for 5V via internal trimming, confirmed in its ordering code suffix "A" (5V fixed).
How does the spread-spectrum feature of MAX20079AATP/VY+ reduce EMI?
When the SPS pin of MAX20079AATP/VY+ is pulled high, the internal oscillator frequency modulates ±3% around its nominal value (2.1MHz or 400kHz), spreading energy across a wider bandwidth. This reduces peak radiated emissions by up to 10dB compared to fixed-frequency operation - critical for passing CISPR 25 Class 5 in automotive camera and radar modules. Spread-spectrum remains active even when SYNC is used for external clocking.
What is the thermal performance of MAX20079AATP/VY+ on a standard four-layer PCB?
On a standard four-layer PCB with 2oz copper and thermal vias to internal ground planes, MAX20079AATP/VY+ achieves θJA = 33°C/W and θJC = 2°C/W. At 3.5A output and 14V input, junction temperature rise is ~115°C above ambient - well within the 150°C max rating. The exposed thermal pad must be soldered to ≥2cm² copper area with ≥6 thermal vias (0.3mm diameter) for optimal performance.
Can MAX20079AATP/VY+ operate in dropout, and what is the minimum dropout voltage?
Yes, MAX20079AATP/VY+ operates in dropout with up to 99% duty cycle, enabling regulation when VIN approaches VOUT. At 5V output, dropout occurs at VIN ≈ 5.2V (accounting for RDS(ON) losses), verified down to -40°C. During dropout, the device pulses the low-side FET briefly every 20μs to recharge the BST capacitor, sustaining gate drive and maintaining regulation stability without external intervention.
MAX20079AATP/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tray
- 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, 5V
- Voltage - Output (Max):
- 12V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 20-SWTQFN (4x4)
MAX20079AATP/VY+ FAQ
1.How can I place an order for MAX20079AATP/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20079AATP/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 MAX20079AATP/VY+ reliable?
The price and inventory of MAX20079AATP/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20079AATP/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20079AATP/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20079AATP/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20079AATP/VY+?
MAX20079AATP/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20079AATP/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 MAX20079AATP/VY+?
For technical support, including MAX20079AATP/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20079AATP/VY+ requirements.
6.How does Aetrix verify that MAX20079AATP/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20079AATP/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 MAX20079AATP/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20079AATP/VY+?
All MAX20079AATP/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20079AATP/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 MAX20079AATP/VY+ part is unused and in its original packaging.
Return procedure for MAX20079AATP/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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