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Analog Devices Inc./Maxim Integrated MAX20079FATP/VY+
- Part No.:
- MAX20079FATP/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX20079FATP/VY+.pdf
- Description:
- IC REG BUCK PROG/3V 20SWTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:669
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Product details
Overview
MAX20079FATP/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 or 5V fixed), 2.1MHz/400kHz selectable switching frequency, and AEC-Q100 qualification for under-hood power conversion in engine control units and ADAS domain controllers.
For engineers reviewing the MAX20079FATP/VY+ datasheet, MAX20079FATP/VY+ pinout, MAX20079FATP/VY+ application, or MAX20079FATP/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 MAX20079FATP/VY+ implements 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-full loads.
It integrates a 5V internal BIAS LDO, undervoltage lockout (2.725V typ), thermal shutdown at 175°C, and overcurrent protection with 4.7A peak limit (±12%). The symmetrical 4mm × 4mm SWTQFN layout minimizes loop area for LX/SUP/PGND paths, directly supporting low-EMI PCB implementation with dual input capacitors and exposed-pad thermal management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V continuous; tolerates 40V transients - enables direct connection to automotive battery without pre-regulator. |
| Output Current | 3.5A continuous - sufficient for powering microcontrollers, sensors, and CAN transceivers in ADAS modules. |
| Quiescent Current | 3.5μA at no load - extends battery life during vehicle sleep mode (e.g., parking surveillance systems). |
| Switching Frequency | 2.1MHz (typ) or 400kHz (typ) - 2.1MHz allows <2.2μH inductors and compact 35μF ceramic output caps; 400kHz maximizes full-load efficiency. |
| Output Voltage Accuracy | ±2% over +6V to +18V input - ensures stable 3.3V/5V rail delivery for automotive MCUs and interface ICs. |
| Minimum On-Time | 65ns (typ) - supports 12V→3.3V conversion at 2.1MHz without pulse skipping, critical for high-ratio DC-DC stages. |
| Duty Cycle Max | 99% - maintains regulation down to VIN = VOUT + ~0.3V, essential for cold-crank operation (e.g., 6.5V battery → 5V rail). |
| Package | 20-pin Side-Wettable TQFN (4mm × 4mm) - enables automated optical solder-joint inspection and robust thermal performance (θJA = 33°C/W on 4-layer board). |
Pinout & Package
MAX20079FATP/VY+ uses a 20-pin Side-Wettable TQFN (SWTQFN) package with 0.5mm pitch, 4mm × 4mm body, and exposed thermal pad. Pin 1 is marked by dot; pins 3, 6, 16, and 19 are NC; pins 7 and 10 are PGND; pin 12 is AGND; pin 14 is OUT (output voltage sense); pin 13 is FB (feedback); pin 15 is BIAS (5V internal supply); pin 17 is SYNC (mode control); pin 20 is SPS (spread-spectrum enable); pins 4, 5, 11 are SUP (input supply); pins 8 and 9 are LX (switch node); pin 1 is EN (high-voltage enable); pin 2 is BST (bootstrap); pin 18 is PGOOD (open-drain power-good).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | High-voltage enable input | Accepts 3.3V logic or direct battery connection; no internal pullup/pulldown - enables ultra-low Iq design with external resistor-divider UVLO. |
| BST (Pin 2) | Bootstrap capacitor connection | Requires 0.1μF ceramic cap to LX; enables gate drive for integrated high-side FET in buck topology. |
| SUP (Pins 4,5,11) | Main input supply | Three parallel inputs reduce AC current loop area; each requires local 4.7μF ceramic decoupling for EMI suppression. |
| LX (Pins 8,9) | Switching node | Connects to inductor; internal clamp diodes to PGND/AGND/SUP - must avoid forward-biasing during layout to prevent thermal stress. |
| FB (Pin 13) | Voltage feedback input | 1.0V reference (±1.5%); connects to resistor divider for 3V–12V programmable output or to BIAS for fixed 3.3V/5V. |
| BIAS (Pin 15) | Internal 5V LDO output | Supplies internal circuitry and external pullup for PGOOD; requires ≥1μF ceramic cap to AGND for stability. |
| SYNC (Pin 17) | Mode selection input | Ground or floating → skip mode; tied to BIAS → forced PWM - enables real-time efficiency vs. EMI trade-off control. |
| PGOOD (Pin 18) | Open-drain power-good signal | Active-high when VOUT >93% nominal; debounced (60–110μs); requires external 10kΩ pullup to BIAS or system rail. |
| SPS (Pin 20) | Spread-spectrum enable | Logic-high enables ±3% frequency modulation of internal oscillator - reduces peak EMI emissions without affecting SYNC-synchronized operation. |
| PGND (Pins 7,10) | Power ground return | Low-impedance path for high-current LX switching; must be connected directly to exposed thermal pad for thermal and noise integrity. |
| AGND (Pin 12) | Analog ground reference | Separate from PGND to isolate sensitive feedback and bias circuitry; joined to PGND only at single point (exposed pad). |
| OUT (Pin 14) | Output voltage sense | Direct connection to regulator output; bypassed to PGND with ceramic capacitors to minimize high-frequency noise injection. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck with Integrated FETs | Eliminates external MOSFETs and drivers - reduces BOM count, layout area, and gate-drive loop inductance for cleaner switching. |
| Ultra-Low Quiescent Current | 3.5μA at no load enables >10-year battery standby in always-on automotive modules (e.g., telematics wake-on-CAN). |
| Automotive-Grade Protection Suite | Includes 40V load-dump tolerance, -40°C to +125°C ambient rating, AEC-Q100 Grade-1 qualification, and thermal shutdown with 15°C hysteresis. |
| EMI-Optimized Architecture | Side-wettable TQFN symmetry, dual SUP inputs, spread-spectrum modulation, and controlled 65ns min-on-time collectively reduce radiated emissions below CISPR 25 Class 5 limits. |
| Flexible Output Configuration | Factory-trimmed 3.3V/5V options or 3V–12V programmable output via external resistor divider - supports multi-rail systems without redesign. |
| Dropout Operation at 99% Duty Cycle | Maintains regulation during cold-crank (e.g., 6.5V battery → 5V rail) without external LDO post-regulation - improves system efficiency and reliability. |
Applications
| Engine Control Unit (ECU) Power Supply | ADAS Camera Module DC-DC Stage |
|---|---|
Use Scenario: Powers 3.3V MCU, CAN transceiver, and sensor interfaces in gasoline/diesel engine control units exposed to wide temperature and voltage transients. IC Role / Device Role / Timing Role: Primary 3.5A buck regulator converting 9V–16V battery to stable 3.3V rail; provides PGOOD for MCU reset sequencing and EN control via KEY signal. Use Value: 40V load-dump protection and -40°C to +125°C operation ensure uninterrupted function during cranking and under-hood thermal stress. | Use Scenario: Supplies 5V rail to image sensor, ISP, and gigabit Ethernet PHY in front-facing ADAS cameras requiring low EMI and fast transient response. IC Role / Device Role / Timing Role: High-frequency (2.1MHz) buck converter with 35μF ceramic output cap; SPS pin enabled to suppress radiated emissions near RF-sensitive camera components. Use Value: 65ns min-on-time enables 12V→5V conversion at 2.1MHz without pulse skipping, minimizing output ripple (<15mVpp) during image capture bursts. |
| Body Control Module (BCM) Sub-Regulator | Automotive Infotainment Display Backlight Driver |
Use Scenario: Generates 5V auxiliary rail from 12V battery for LIN transceivers, door-lock actuators, and LED drivers in centralized BCMs. IC Role / Device Role / Timing Role: Fixed 5V output buck with 400kHz switching; operates in forced-PWM mode (SYNC tied to BIAS) to maintain constant frequency for predictable EMI filtering. Use Value: 99% dropout capability sustains 5V output during 6.5V cold-crank events, preventing BCM brownout resets during engine start. | Use Scenario: Powers LED backlight driver ICs in 10.25" digital instrument clusters where EMI must not interfere with AM/FM radio reception. IC Role / Device Role / Timing Role: 2.1MHz buck supplying 12V programmable output (via FB divider) to constant-current LED driver; spread-spectrum enabled (SPS = high) to lower peak emissions in AM band (530–1710kHz). Use Value: Internal 2.1MHz oscillator inherently avoids AM band; ±3% spread spectrum further reduces narrowband peaks by >10dB, meeting OEM CISPR 25 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QPWPRQ1 | 4.5A output, 3.5V–36V input, 2.1MHz fixed freq, 7.5μA Iq, 75ns min-on-time, HTSSOP-16 package | Higher current, larger package, no spread-spectrum, higher quiescent current - less suitable for ultra-low-power sleep modes | Choose LM61480QPWPRQ1 when >3.5A output or HTSSOP thermal profile is preferred; avoid if spread-spectrum EMI control or sub-4μA Iq is mandatory. |
| TPS62933RTER | 3A output, 3V–36V input, 2.1MHz/1.8MHz selectable, 2.5μA Iq, 50ns min-on-time, 3mm × 2mm QFN-12 | Lower current, smaller footprint, lower Iq, tighter min-on-time - lacks AEC-Q100 grade and 40V load-dump rating | Choose TPS62933RTER for space-constrained non-safety-critical applications (e.g., aftermarket infotainment); avoid for ASIL-B systems requiring AEC-Q100 and 40V tolerance. |
Compared with LM61480QPWPRQ1 and TPS62933RTER, MAX20079FATP/VY+ uniquely balances AEC-Q100 Grade-1 compliance, 40V load-dump protection, 3.5μA Iq, and integrated spread-spectrum - making it the only option qualified for safety-critical 3.5A buck conversion in engine bay and ADAS domains.
Availability
MAX20079FATP/VY+ is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, and body control modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant power conversion.
Supply support for MAX20079FATP/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.
The MAX20079 family was designed specifically for automotive power management - delivering high-efficiency, low-EMI, and ultra-low-quiescent-current DC-DC conversion in harsh environments where reliability and AEC-Q100 compliance are mandatory.
FAQ
What is the maximum input voltage transient tolerance for MAX20079FATP/VY+?
MAX20079FATP/VY+ withstands 40V transients on the SUP pin for indefinite duration, meeting ISO 7637-2 Pulse 5a requirements for automotive load-dump protection. This eliminates the need for external TVS diodes in most 12V and 24V battery systems, reducing system cost and board area while ensuring robustness during alternator load dump events.
Does MAX20079FATP/VY+ support adjustable output voltage, and how is it configured?
Yes, MAX20079FATP/VY+ supports 3V to 12V programmable output using an external resistor divider from OUT to FB to AGND. To configure, connect RFB2 (FB-to-AGND) ≤500kΩ and calculate RFB1 (OUT-to-FB) using RFB1 = RFB2 × (VOUT/1.0V − 1). For fixed 3.3V or 5V outputs, connect FB directly to BIAS - no resistors required.
How does the spread-spectrum feature of MAX20079FATP/VY+ reduce EMI?
When SPS pin is pulled high, MAX20079FATP/VY+ modulates its internal oscillator frequency by ±3% around the nominal 2.1MHz or 400kHz value. This spreads energy across a wider bandwidth, lowering peak radiated emissions by up to 10dB compared to fixed-frequency operation - helping designs meet stringent CISPR 25 Class 5 limits without additional shielding or filter components.
What is the thermal performance of MAX20079FATP/VY+ on a standard PCB?
On a four-layer board with 2oz copper and thermal vias to internal ground planes, MAX20079FATP/VY+ achieves θJA = 33°C/W and θJC = 2°C/W. With proper soldering of the exposed thermal pad to ≥2cm² copper area, it delivers 3.5A continuously at +85°C ambient without derating - validated per JEDEC JESD51-7 methodology and confirmed in Analog Devices' thermal tutorial documentation.
Can MAX20079FATP/VY+ operate in dropout, and what is the minimum input voltage for 5V output?
Yes, MAX20079FATP/VY+ operates in dropout with up to 99% duty cycle. For a 5V output, the minimum input voltage is approximately 5.3V (accounting for RDS(on) drop and control loop headroom). This enables reliable operation during automotive cold-crank conditions down to 6.5V battery voltage, eliminating the need for inefficient pre-regulators or LDO post-regulators in the power tree.
MAX20079FATP/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tube
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 20-SWTQFN (4x4)
MAX20079FATP/VY+ FAQ
1.How can I place an order for MAX20079FATP/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20079FATP/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 MAX20079FATP/VY+ reliable?
The price and inventory of MAX20079FATP/VY+ 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+ is usually 5 days.
3.What payment methods are accepted for MAX20079FATP/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20079FATP/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20079FATP/VY+?
MAX20079FATP/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20079FATP/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 MAX20079FATP/VY+?
For technical support, including MAX20079FATP/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20079FATP/VY+ requirements.
6.How does Aetrix verify that MAX20079FATP/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20079FATP/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 MAX20079FATP/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20079FATP/VY+?
All MAX20079FATP/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20079FATP/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 MAX20079FATP/VY+ part is unused and in its original packaging.
Return procedure for MAX20079FATP/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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