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Analog Devices Inc./Maxim Integrated MAX20079FATP/VY+T
- Part No.:
- MAX20079FATP/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX20079FATP/VY+T.pdf
- Description:
- IC REG BUCK PROG/3V 20SWTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,906
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Product details
Overview
The MAX20079FATP/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 provides ±2% output voltage accuracy over 6V–18V input, supports fixed 5V output or programmable 3V–12V via external resistor divider, and operates at either 2.1MHz or 400kHz switching frequency - enabling compact, low-EMI DC-DC conversion in automotive body control modules.
For engineers reviewing the MAX20079FATP/VY+T datasheet, MAX20079FATP/VY+T pinout, MAX20079FATP/VY+T application, or MAX20079FATP/VY+T equivalent, key selection criteria include its AEC-Q100 qualification, 40V load-dump protection, 65ns minimum on-time for high VIN/VOUT ratios, PGOOD monitoring, and side-wettable 20-pin TQFN package optimized for thermal and EMI performance in space-constrained automotive systems.
Technical Context
The MAX20079FATP/VY+T implements current-mode control with internal slope compensation, eliminating need for external loop compensation. Its 2.1MHz/400kHz fixed-frequency operation supports both forced-PWM (via SYNC pin) and ultra-low-Iq skip mode - automatically engaging at light loads to maintain efficiency down to microamp-level standby.
It integrates a 5V internal BIAS LDO, undervoltage lockout (2.725V typ), thermal shutdown (175°C), and overcurrent protection (4.7A peak limit). The symmetrical 4mm × 4mm SWTQFN layout enables dual-input-capacitor placement to cancel magnetic fields, directly supporting low-radiated EMI design without added filtering components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.5A continuous - sufficient for powering automotive infotainment SoCs or ADAS sensor rails. |
| Input Voltage Range | 3V to 36V - covers cold-crank (3V) to load-dump (40V transient) conditions per ISO 7637-2. |
| Quiescent Current | 3.5μA at no load - enables >10-year battery life in always-on automotive modules. |
| Switching Frequency | 2.1MHz (typ) - allows use of sub-3μH inductors and <10μF ceramic output caps, minimizing solution size. |
| Output Voltage Accuracy | ±2% over 6V–18V input - ensures stable logic supply under wide battery and alternator variation. |
| Minimum On-Time | 65ns - supports 12V-to-1.8V conversion at 2.1MHz without pulse-skipping instability. |
| Duty Cycle Max | 99% - maintains regulation during automotive dropout (e.g., 5.5V input → 5V output). |
Pinout & Package
The MAX20079FATP/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 (θJA = 33°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | High-voltage enable input | Accepts 3.3V–36V logic; no internal pullup - enables direct connection to automotive KEY/CAN inhibit signals. |
| BST | Bootstrap capacitor node | Requires 0.1μF ceramic between BST and LX to drive high-side FET gate above SUP rail. |
| SUP (Pins 4,5,11) | Main power input | Three parallel pins reduce IR drop and improve high-current path robustness for 36V transients. |
| LX (Pins 8,9) | Switching node | Drives external inductor; internal clamp diodes protect against inductive kickback during shutdown. |
| FB | Voltage feedback input | 1.0V reference; connects to BIAS for fixed 5V output or to resistor divider for 3V–12V programming. |
| BIAS | Internal 5V bias supply | Powers internal circuitry; requires ≥1μF ceramic cap to ground for stability and noise rejection. |
| PGOOD | Open-drain power-good flag | Active-high signal debounced at 60–110μs; requires external 10kΩ pullup for system power sequencing. |
| SYNC | Mode control / clock sync | Ground = skip mode; BIAS = forced PWM; enables dynamic efficiency/EMI tradeoff during runtime. |
| SPS | Spread-spectrum enable | Logic-high enables ±3% frequency dithering - reduces peak EMI by >10dB without affecting regulation. |
| PGND (Pins 7,10,16,19) | Power ground return | Four dedicated pins minimize ground bounce and improve current sharing under 3.5A load steps. |
| AGND | Analog ground reference | Separate from PGND to isolate sensitive feedback and oscillator circuits from switching noise. |
| OUT | Output voltage sense | Connects to output capacitor bank; bypassed with ceramics to PGND for low-noise regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Integrated 70mΩ high-side + 70mΩ low-side MOSFETs eliminate external FETs and drivers - reducing BOM count by ≥6 components. |
| AEC-Q100 Qualified | Rated for -40°C to +125°C ambient, with 175°C thermal shutdown and 15°C hysteresis - meets automotive reliability and safety requirements. |
| 40V Load-Dump Protection | Withstands ISO 7637-2 Pulse 5a (40V/350ms) without external TVS - simplifies front-end protection in 12V/24V vehicle systems. |
| Side-Wettable TQFN | 20-pin 4mm × 4mm package with solderable side walls - enables automated AOI and improves solder-joint reliability in high-vibration environments. |
| Programmable Soft-Start | Fixed 3.5ms (2.1MHz) or 5.5ms (400kHz) ramp - prevents inrush current and ensures clean power-up of downstream processors and sensors. |
Applications
| Body Control Module (BCM) | ADAS Camera Power Supply |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and LED drivers in door module or lighting controller. IC Role / Device Role / Timing Role: Primary 5V rail regulator with PGOOD sequencing and load-dump survival. Use Value: 3.5μA quiescent current extends battery life during vehicle sleep mode; 99% duty cycle sustains output during cranking. | Use Scenario: Supplies clean 3.3V to image sensor and ISP in forward-facing camera system. IC Role / Device Role / Timing Role: Low-noise, high-PSRR buck converter with spread-spectrum EMI reduction for CISPR-25 Class 5 compliance. Use Value: 2.1MHz operation minimizes inductor size; symmetrical PCB layout cancels magnetic fields - reducing radiated emissions by >8dB. |
| Infotainment Head Unit | Automotive Telematics Control Unit (TCU) |
Use Scenario: Generates 5V for display interface, audio codec, and USB PHY in center-stack head unit. IC Role / Device Role / Timing Role: High-efficiency main DC-DC stage with EN-controlled power gating and thermal fault reporting. Use Value: Forced-PWM mode (via SYNC) ensures constant switching frequency for predictable EMI filtering; PGOOD enables safe processor reset sequencing. | Use Scenario: Provides 5V rail to cellular modem, GNSS receiver, and secure MCU in embedded telematics gateway. IC Role / Device Role / Timing Role: Automotive-qualified buck converter with 40V transient tolerance and AEC-Q100 Grade 1 certification. Use Value: Integrated 4.7A current limit and thermal shutdown prevent field failures under sustained overload or high-ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRNXTQ1 | 4.5V–36V input, 8A output, 12μA Iq, 2.1MHz fixed freq, no spread spectrum | Higher current, higher Iq, no SPS - suited for higher-power domains but less optimal for ultra-low-power wake-up states | Select when >5A output or tighter thermal margin is required; verify PCB layout for higher current density. |
| TPS62933RTER | 3V–36V input, 3.5A output, 1.2μA Iq, 2.25MHz freq, no AEC-Q100 rating | Lower Iq, higher frequency, non-automotive qualified - suitable for industrial IoT but not for production automotive ECUs | Consider only for non-safety-critical, non-AEC-Q100 applications where lowest possible standby current is prioritized over qualification. |
Compared with LM61480QRNXTQ1 and TPS62933RTER, the MAX20079FATP/VY+T uniquely balances AEC-Q100 Grade 1 compliance, 3.5μA Iq, integrated spread spectrum, and side-wettable packaging - making it the only option among the three qualified for volume automotive deployment with stringent EMI and long-term reliability requirements.
Availability
The MAX20079FATP/VY+T is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera power supplies, infotainment head units, and telematics control units requiring stable component supply across extended temperature and transient-voltage conditions.
Supply support for MAX20079FATP/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 MAX20079FATP/VY+T belongs to Analog Devices' automotive power management portfolio, designed specifically to replace discrete buck solutions in 12V/24V vehicle systems - emphasizing ultra-low quiescent current, AEC-Q100 reliability, and EMI-hardened integration for next-generation E/E architectures.
FAQ
What is the output voltage configuration of the MAX20079FATP/VY+T?
The MAX20079FATP/VY+T is factory-trimmed for fixed 5V output. To configure this, connect the FB pin directly to the BIAS pin. This eliminates external resistors and ensures ±2% regulation accuracy across temperature and line variations. The MAX20079FATP/VY+T does not support adjustable output out-of-box - external resistor dividers require reconfiguration not enabled in this variant.
Does the MAX20079FATP/VY+T support spread-spectrum operation?
Yes, the MAX20079FATP/VY+T supports spread-spectrum frequency modulation via the SPS pin. When SPS is pulled high to BIAS, the internal oscillator dithers ±3% around its nominal frequency (2.1MHz or 400kHz), reducing peak radiated EMI by up to 10dB. Spread spectrum is active only when using the internal oscillator - it does not interfere with external SYNC clocking.
What package type and thermal characteristics does the MAX20079FATP/VY+T use?
The MAX20079FATP/VY+T uses a 4mm × 4mm, 20-pin Side-Wettable TQFN (SWTQFN) package with exposed thermal pad. Its thermal resistance is θJA = 33°C/W on a 4-layer board and θJC = 2°C/W, enabling reliable operation at full 3.5A load in +125°C ambient. The side-wettable feature supports automated optical inspection of solder joints - critical for automotive manufacturing traceability.
How does the MAX20079FATP/VY+T handle automotive load-dump transients?
The MAX20079FATP/VY+T withstands 40V load-dump transients per ISO 7637-2 Pulse 5a without external protection components. Its absolute maximum SUP rating is +40V, and internal circuitry remains functional during the 350ms transient event. This eliminates need for external TVS diodes in many 12V automotive applications, reducing cost and board area while maintaining AEC-Q100 compliance.
Can the MAX20079FATP/VY+T operate in dropout mode, and what is its minimum dropout voltage?
Yes, the MAX20079FATP/VY+T operates in dropout by achieving up to 99% duty cycle, allowing regulation even when input voltage drops near the output level (e.g., 5.5V input → 5V output). Its effective dropout voltage is ~100mV at 3.5A due to combined RDS(on) of high-side and low-side FETs (~140mΩ total), enabling stable operation during cold-crank events down to 3V input without rail collapse.
MAX20079FATP/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 (3.395V)
- Voltage - Output (Max):
- 12V
- 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:
- 20-SWTQFN (4x4)
MAX20079FATP/VY+T FAQ
1.How can I place an order for MAX20079FATP/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20079FATP/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 MAX20079FATP/VY+T reliable?
The price and inventory of MAX20079FATP/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 MAX20079FATP/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20079FATP/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20079FATP/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20079FATP/VY+T?
MAX20079FATP/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20079FATP/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 MAX20079FATP/VY+T?
For technical support, including MAX20079FATP/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20079FATP/VY+T requirements.
6.How does Aetrix verify that MAX20079FATP/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20079FATP/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 MAX20079FATP/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20079FATP/VY+T?
All MAX20079FATP/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20079FATP/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 MAX20079FATP/VY+T part is unused and in its original packaging.
Return procedure for MAX20079FATP/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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