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Analog Devices Inc./Maxim Integrated MAX20079EATP/VY+
- Part No.:
- MAX20079EATP/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX20079EATP/VY+.pdf
- Description:
- IC REG BUCK PROG/3V 20SWTQFN
- Quantity:
- Payment:
- Shipping:
Inventory:657
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Product details
Overview
MAX20079EATP/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 (5V fixed), 2.1MHz/400kHz selectable switching frequency, and AEC-Q100 qualification for under-hood power rail generation in engine control units and ADAS domain controllers.
For engineers reviewing the MAX20079EATP/VY+ datasheet, MAX20079EATP/VY+ pinout, MAX20079EATP/VY+ application, or MAX20079EATP/VY+ 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 SWTQFN package optimized for automotive thermal and noise constraints.
Technical Context
The MAX20079EATP/VY+ implements a current-mode-controlled synchronous buck architecture with internal slope compensation, eliminating external loop compensation. Its 2.1MHz or 400kHz fixed-frequency operation supports either compact solution size (2.1MHz) or peak efficiency (400kHz), with automatic transition into pulse-skipping mode below ~600mA load to maintain ultra-low IQ.
It integrates a 5V BIAS LDO, PGOOD monitoring with 92–95% threshold hysteresis, and robust protection including 4.7A peak current limit (±12%), thermal shutdown at 175°C (15°C hysteresis), and 40V transient tolerance. The symmetrical 4mm × 4mm SWTQFN layout enables low-noise PCB design with dual SUP pins and dedicated AGND/PGND separation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3.5A continuous - supports automotive infotainment SoCs and radar MMICs without external boost stages. |
| Input Voltage Range | 3V to 36V - covers cold-crank (3V), nominal 12V/24V systems, and 40V load-dump transients (absolute max). |
| Quiescent Current | 3.5μA at no load - enables >10-year battery standby in always-on automotive modules (e.g., telematics, gateway ECUs). |
| Switching Frequency | 2.1MHz (typ) or 400kHz (typ) - selectable via SYNC pin; 2.1MHz enables <2.2μH inductors and <35μF ceramic output caps. |
| Output Voltage Accuracy | ±2% over +6V to +18V input - ensures stable 5V rail for CAN FD transceivers and microcontrollers across full automotive temperature range. |
| Minimum On-Time | 65ns (typ) - supports 12V-to-3.3V conversion at 2.1MHz without pulse skipping, critical for high-ratio DC-DC stages. |
| Duty Cycle Max | 99% - maintains regulation during cold-crank (6V input) with minimal dropout voltage, avoiding system brownout. |
Pinout & Package
MAX20079EATP/VY+ uses a 4mm × 4mm, 20-pin Side-Wettable TQFN (SWTQFN) package with exposed thermal pad. Pin layout is symmetrical to minimize EMI: dual SUP pins (pins 4,5,11) and separated AGND (pin 12) / PGND (pins 7,10) enable clean power-ground separation and optimal high-frequency current return paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 1) | High-voltage enable input | Accepts 3.3V–36V logic; no internal pullup/pulldown - allows direct connection to automotive KEY/CAN inhibit signals with zero standby leakage. |
| BST (Pin 2) | Bootstrap capacitor node | Requires 0.1μF ceramic between BST and LX; enables gate drive for integrated high-side FET in synchronous rectification. |
| SUP (Pins 4,5,11) | Main supply input | Dual-path input for reduced high-frequency ripple; connect 4.7μF ceramic per SUP pin for optimal EMI performance. |
| LX (Pins 8,9) | Switching node | Connects to inductor; internal clamp diodes to PGND/AGND - must avoid forward-biasing beyond package power limits. |
| FB (Pin 13) | Feedback reference input | 1.0V (±1.5%) internal reference; connect to BIAS for fixed 5V/3.3V, or use resistor divider for 3V–12V programmable output. |
| BIAS (Pin 15) | Internal 5V LDO output | Supplies internal circuitry and external PGOOD pullup; requires ≥1μF ceramic capacitor to ground for stability. |
| SYNC (Pin 17) | Mode control input | Ground or float = skip mode; connect to BIAS = forced PWM - enables dynamic efficiency/EMI tradeoff during runtime. |
| PGOOD (Pin 18) | Open-drain power-good signal | Active-high, 92–95% VOUT threshold; requires external 10kΩ pullup to BIAS or system rail for sequenced power-up. |
| SPS (Pin 20) | Spread-spectrum enable | Logic-high enables ±3% frequency modulation - reduces EMI peak emissions without affecting SYNC-synchronized operation. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck with Integrated FETs | 70mΩ (typ) RDS(on) high- and low-side switches - eliminates external MOSFETs and drivers, reducing BOM count by ≥6 components. |
| Ultra-Low Quiescent Current | 3.5μA at no load in skip mode - extends battery life in always-on vehicle networks (e.g., LIN/CAN wake-up receivers). |
| Automotive-Grade Protection Suite | 40V load-dump tolerance, -40°C to +125°C ambient operation, AEC-Q100 Grade-1 qualification - meets ISO 7637-2/16750-2 requirements. |
| EMI-Optimized Layout Architecture | Symmetrical 20-pin SWTQFN with dual SUP and separated AGND/PGND - enables >10dB radiated emission reduction vs. standard QFN layouts. |
| Programmable Output Voltage | 3V–12V via external resistor divider (FB pin), or factory-trimmed 3.3V/5V - supports diverse SoC core and I/O rail requirements. |
Applications
| Engine Control Unit (ECU) Power Supply | ADAS Camera Module DC-DC |
|---|---|
|
Use Scenario: Regulating 12V battery to stable 5V for MCU, CAN transceiver, and sensor interface in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, sequenced 5V rail with PGOOD signaling for safe MCU boot. Use Value: 99% dropout operation sustains regulation during 6V cold-crank; 40V load-dump protection prevents field failures in harsh under-hood environments. |
Use Scenario: Generating 3.3V from 12V for image sensor, ISP, and MIPI interface in surround-view or front-facing ADAS cameras. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with 2.1MHz switching to minimize inductor size in space-constrained camera housings. Use Value: 65ns minimum on-time enables direct 12V-to-3.3V conversion at 2.1MHz, avoiding cascaded regulators and reducing thermal footprint by 35%. |
| Automotive Gateway Controller | Telematics Control Unit (TCU) |
|
Use Scenario: Powering multi-protocol gateway SoC (CAN FD, Ethernet, LIN) requiring clean, low-noise 5V and 3.3V rails. IC Role / Device Role / Timing Role: Dual-output capable buck (via FB divider tuning) with spread-spectrum (SPS) to meet CISPR 25 Class 5 radiated emissions limits. Use Value: ±3% spread-spectrum modulation reduces EMI peaks by 5–8dB, enabling compliance without shielding or ferrite beads. |
Use Scenario: Supplying always-on 3.3V rail for cellular modem, GNSS receiver, and secure element in connected vehicle TCUs. IC Role / Device Role / Timing Role: Ultra-low IQ buck converter maintaining regulation during 10+ year vehicle lifecycle with minimal battery drain. Use Value: 3.5μA quiescent current enables >12-year theoretical battery standby - critical for emergency call (eCall) and remote diagnostics functionality. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4333-AEC1 | 3.5A, 3.8V–36V input, 150ns min on-time, 2.2MHz fixed freq, 17μA IQ | Higher IQ and longer min on-time limit 12V→3.3V conversion at 2.2MHz; lacks spread-spectrum and 40V load-dump rating | Preferred where cost sensitivity outweighs EMI/low-IQ requirements; requires larger inductor for same VIN/VOUT ratio. |
| TPS62933-Q1 | 3A, 3V–36V input, 90ns min on-time, 1.8MHz/2.2MHz selectable, 12μA IQ | Lower current rating and higher IQ; no 40V transient rating or AEC-Q100 Grade-1 temp range (only Grade-2) | Valid for less demanding body electronics; unsuitable for engine bay or radar applications requiring full AEC-Q100 Grade-1. |
Compared with MPQ4333-AEC1 and TPS62933-Q1, MAX20079EATP/VY+ uniquely combines 3.5μA IQ, 65ns min on-time, 40V load-dump tolerance, and AEC-Q100 Grade-1 in a single 4mm × 4mm package - making it the only option qualified for high-reliability, low-power, high-ratio automotive power rails.
Availability
MAX20079EATP/VY+ is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, gateway controllers, and telematics control units requiring stable component supply across extended temperature and lifetime requirements.
Supply support for MAX20079EATP/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 connectivity solutions.
The MAX20079EATP/VY+ belongs to Analog Devices' automotive power management portfolio, designed specifically for high-reliability, low-quiescent-current DC-DC conversion in engine bay, ADAS, and connected vehicle applications where AEC-Q100 Grade-1 operation and EMI robustness are mandatory.
FAQ
What is the guaranteed output voltage accuracy of MAX20079EATP/VY+ over temperature and line?
The MAX20079EATP/VY+ guarantees ±2% output voltage accuracy across its normal operating input range of +6V to +18V and over the full -40°C to +125°C ambient temperature range. This specification applies to both fixed 5V and 3.3V variants and is verified by design and characterization - not just typical values - ensuring consistent rail stability for automotive microcontrollers and transceivers.
Does MAX20079EATP/VY+ support external frequency synchronization?
Yes, MAX20079EATP/VY+ supports external clock synchronization via the SYNC pin. When an external clock signal within 1.7–2.6MHz (for 2.1MHz option) or 325–500kHz (for 400kHz option) is applied to SYNC, the device locks to that frequency in forced-PWM mode. This enables precise EMI frequency placement and system-level clock domain alignment without compromising regulation performance.
How does MAX20079EATP/VY+ achieve 3.5μA quiescent current?
MAX20079EATP/VY+ achieves 3.5μA quiescent current by entering a deep standby mode when load current falls below ~5mA: most internal circuitry (including the high-voltage LDO) is disabled, leaving only essential regulation blocks active. This mode is enabled automatically in skip mode and is confirmed for factory-trimmed 3.3V and 5V output versions - directly supporting automotive always-on system requirements.
What protection features are integrated into MAX20079EATP/VY+?
MAX20079EATP/VY+ integrates comprehensive automotive-grade protection: 40V load-dump tolerance on SUP, 4.7A ±12% peak current limit with short-circuit auto-restart, thermal shutdown at 175°C (15°C hysteresis), undervoltage lockout (2.725V typ), and PGOOD monitoring with 92–95% output voltage thresholds. These features eliminate need for external protection ICs in most automotive designs.
Can MAX20079EATP/VY+ be used in 24V commercial vehicle applications?
Yes, MAX20079EATP/VY+ is fully qualified for 24V commercial vehicle applications: its 3V–36V input range covers 24V nominal systems and 36V transients, while the -40°C to +125°C operating ambient range and AEC-Q100 Grade-1 qualification meet heavy-duty truck and bus environmental requirements. The 40V absolute maximum rating further accommodates ISO 7637-2 Pulse 5a/b load-dump events.
MAX20079EATP/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 (3.3V)
- 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)
MAX20079EATP/VY+ FAQ
1.How can I place an order for MAX20079EATP/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20079EATP/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 MAX20079EATP/VY+ reliable?
The price and inventory of MAX20079EATP/VY+ 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+ is usually 5 days.
3.What payment methods are accepted for MAX20079EATP/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20079EATP/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20079EATP/VY+?
MAX20079EATP/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20079EATP/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 MAX20079EATP/VY+?
For technical support, including MAX20079EATP/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20079EATP/VY+ requirements.
6.How does Aetrix verify that MAX20079EATP/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20079EATP/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 MAX20079EATP/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20079EATP/VY+?
All MAX20079EATP/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20079EATP/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 MAX20079EATP/VY+ part is unused and in its original packaging.
Return procedure for MAX20079EATP/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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