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Analog Devices Inc./Maxim Integrated MAX16939ATESB/V+T
- Part No.:
- MAX16939ATESB/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16939ATESB/V+T.pdf
- Description:
- IC REG BUCK ADJ/1V 3.5A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,889
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Product details
Overview
MAX16939ATESB/V+T from Maxim Integrated is a 3.5A, 36V input current-mode synchronous step-down converter with integrated high-side and low-side MOSFETs, fixed 5V output (±2%), 28µA no-load quiescent current, and resistor-programmable switching frequency up to 2.2MHz - designed for automotive power rails in navigation head units and RF-sensitive infotainment systems.
For engineers reviewing the MAX16939ATESB/V+T datasheet, MAX16939ATESB/V+T pinout, MAX16939ATESB/V+T application, or MAX16939ATESB/V+T equivalent, key selection criteria include its AEC-Q100 qualification, 98% max duty cycle for cold-crank support, tight ±2% output accuracy, 180° out-of-phase SYNCOUT for cascaded supplies, and MAX16939-specific 105% overvoltage protection threshold.
Technical Context
The MAX16939ATESB/V+T implements current-mode control with cycle-by-cycle current limiting and automatic LX slew-rate adjustment (4ns at >1.1MHz) to balance EMI and efficiency. Its dual supply inputs (SUP/SUPSW) enable operation down to 3.5V while maintaining regulation during undervoltage transients.
It supports three operating modes via FSYNC: skip mode (FSYNC = AGND), forced PWM (FSYNC = BIAS or external clock), and external synchronization (FSYNC = clock signal within ±20% of fOSC). The 180° phase-shifted SYNCOUT enables interleaved multi-phase designs without external delay circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V (42V tolerant); supports automotive battery transients including load dump and cold crank. |
| Output Voltage | Fixed 5V ±2% (no external resistors required); regulated at FB pin with 1.0V reference. |
| Max Output Current | 3.5A continuous; peak LX current limit 4.2–6.2A ensures robust overload handling. |
| Quiescent Current | 28µA at no load; enables always-on functionality in automotive body electronics. |
| Switching Frequency | 220kHz–2.2MHz (resistor-programmable); 2.2MHz operation enables compact 2.2µH inductors and reduced output capacitance. |
| OVP Threshold | 105% of VOUT rising (monitored at FB); tighter than MAX16935's 107%, critical for protecting downstream 5V logic. |
| Thermal Protection | 175°C shutdown with 15°C hysteresis; ensures safe operation under sustained high-temperature automotive conditions. |
Pinout & Package
MAX16939ATESB/V+T is housed in a 16-pin 5mm × 5mm TQFN-EP package with exposed pad connected to PGND for thermal dissipation. Pin functions are validated per Maxim's official datasheet revision 17 (1/18).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – SYNCOUT | Open-drain clock output | 180° out-of-phase with internal oscillator; enables synchronized cascaded buck stages without external phase shifters. |
| 2 – FSYNC | Mode select & sync input | Logic-controlled entry into skip mode (AGND) or FPWM (BIAS/clock); synchronizes to external clocks within ±20% frequency tolerance. |
| 3 – FOSC | Frequency programming node | Resistor-to-AGND sets fSW (e.g., 12kΩ → 2.2MHz); enables precise EMI optimization across board designs. |
| 4 – OUT | Power output & internal supply | Delivers regulated 5V; powers internal circuitry when VOUT ≥ 3V, eliminating need for separate bias rail. |
| 5 – FB | Feedback sensing input | Monitors output via internal 1.0V reference; tied to BIAS for fixed 5V operation; enables adjustable outputs (1V–10V) with external divider. |
| 6 – COMP | Error amplifier output | Drives external RC compensation network; stabilizes loop response across line/load/temperature variations. |
| 7 – BIAS | 5V linear regulator output | Supplies internal analog blocks; requires 1µF ceramic bypass to AGND; UVLO at 2.95–3.40V ensures clean startup. |
| 8 – AGND | Analog ground reference | Separate from PGND to minimize noise coupling into feedback and error amplifier paths. |
| 9 – BST | High-side gate driver supply | Bootstrap capacitor (0.1µF) between BST and LX enables N-channel high-side MOSFET drive without external charge pump. |
| 10 – EN | Enable control input | 3.3V–42V compatible; 2.4V HI threshold allows direct connection to KL30 or CAN transceiver INH pins. |
| 11 – SUP | Main supply input | Powers internal LDO; bypassed with 4.7µF ceramic; supports full 3.5V–36V range including cold-crank dips. |
| 12 – SUPSW | Switch supply input | Independent rail for high-side switch; bypassed with 0.1µF + 4.7µF ceramics to suppress switching noise on power path. |
| 13–14 – LX | Switching node | Connects to Schottky diode cathode and inductor; automatic slew-rate control (4ns/8ns) minimizes EMI at high/low frequencies. |
| 15 – PGND | Power ground return | Low-impedance return for high-current LX path; must be connected to exposed pad (EP) and system PGND plane. |
| 16 – PGOOD | Open-drain power-good flag | Asserts high when VOUT > 95% of regulation (4.75V); deasserts at <92% (4.6V); enables safe power sequencing with µC or FPGA. |
| EP – Exposed Pad | Thermal & electrical ground | Must be soldered to large contiguous copper PGND plane; not a substitute for pin 15 connection; reduces θJA to 35°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.5A MOSFETs | Eliminates external high-side/low-side switches and associated gate drivers, reducing BOM count by ≥6 components. |
| 180° SYNCOUT clock | Enables two-stage interleaved buck conversion with 50% ripple cancellation, cutting output capacitor requirements by ~30%. |
| AEC-Q100 qualified | Validated for automotive temperature range (−40°C to +125°C junction), ensuring reliability in engine bay and dashboard environments. |
| 98% max duty cycle | Maintains regulation during 3.5V cold-crank events without dropout, supporting always-on telematics and ADAS modules. |
| Tight 105% OVP (MAX16939) | Reduces output overshoot during transient faults versus MAX16935 (107%), protecting 5V microcontrollers and interface ICs. |
| 28µA quiescent current | Meets ISO 16750-2 standby current limits for automotive ECUs, enabling >1-year battery life in parked vehicle scenarios. |
Applications
| Navigation Head Units | RF Transceiver Power Rails |
|---|---|
|
Use Scenario: Powering display controllers, touch processors, and GPS receivers in automotive infotainment systems. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering stable, low-noise power with fast transient response to dynamic CPU loads. Use Value: 28µA IQ enables always-on GPS wake-up; 98% duty cycle sustains operation during engine start; AEC-Q100 ensures field reliability. |
Use Scenario: Supplying clean 5V power to cellular/V2X modems and Wi-Fi/BT SoCs where EMI must meet CISPR 25 Class 5 limits. IC Role / Device Role / Timing Role: Fixed-frequency FPWM mode eliminates spectral spreading, enabling predictable EMI filtering design. Use Value: Synchronization capability (FSYNC/SYNCOUT) allows multi-rail coordination; 2.2MHz operation shifts noise above sensitive RF bands. |
| ADAS Camera Modules | Body Control Modules (BCM) |
|
Use Scenario: Providing regulated 5V to image sensors and ISP processors in rear-view and surround-view camera systems. IC Role / Device Role / Timing Role: High-efficiency buck converter with thermal shutdown and overvoltage protection for harsh under-hood environments. Use Value: 175°C thermal shutdown prevents latch-up during prolonged sun exposure; 42V tolerance handles load-dump transients. |
Use Scenario: Powering microcontrollers, LIN transceivers, and LED drivers in door modules, seat controls, and lighting nodes. IC Role / Device Role / Timing Role: Always-on power supply with programmable soft-start and PGOOD sequencing for multi-rail subsystems. Use Value: PGOOD output coordinates startup with MCU reset; EN pin compatibility with 3.3V logic simplifies interface to low-voltage MCUs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16935ATESB/V+T | Same pinout and footprint; 107% OVP threshold; higher skip-mode current threshold (150–400mA vs. 200–500mA). | Preferred where looser OVP margin is acceptable and lower light-load current threshold improves efficiency at sub-200mA loads. | Select MAX16935ATESB/V+T only if system-level OVP testing confirms 107% threshold suffices for downstream 5V ICs. |
| LM61480QRNXTQ1 | 3.5A, 36V automotive buck; 12µA IQ; no integrated low-side FET; requires external diode or synchronous rectifier. | Lacks integrated low-side MOSFET and 180° SYNCOUT; supports spread-spectrum but no FPWM/skip mode selection via FSYNC. | Choose LM61480QRNXTQ1 when ultra-low IQ is mandatory and board space allows external FET/diode; avoid if cascaded supply timing is required. |
Compared with MAX16935ATESB/V+T and LM61480QRNXTQ1, the MAX16939ATESB/V+T uniquely combines AEC-Q100 qualification, integrated low-side FET for true FPWM light-load operation, 105% OVP for tighter fault containment, and 180° SYNCOUT for deterministic multi-phase design - making it optimal for safety-critical automotive power rails where precision and coordination are non-negotiable.
Availability
MAX16939ATESB/V+T is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera power, and body control module applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for MAX16939ATESB/V+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
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.
The MAX16935/MAX16939 product line delivers high-efficiency, high-reliability DC-DC conversion for automotive power systems - engineered specifically for cold-crank resilience, EMI control in RF-dense environments, and seamless integration into ASIL-B compliant architectures.
FAQ
What is the output voltage configuration of the MAX16939ATESB/V+T?
The MAX16939ATESB/V+T features a factory-set fixed 5V output with ±2% accuracy over temperature and line. It achieves this by internally connecting the FB pin to the 5V BIAS rail - no external resistors are needed. This configuration is confirmed in the Electrical Characteristics table (VOUT_5V = 4.9V to 5.1V) and General Description section of the datasheet.
How does the MAX16939ATESB/V+T handle cold-crank conditions?
The MAX16939ATESB/V+T maintains regulation during cold-crank events (down to 3.5V input) using its 98% maximum duty cycle and dual-supply architecture (SUP/SUPSW). When input drops, the controller extends on-time to sustain 5V output without dropout - verified in Typical Operating Characteristics figure "VOUT vs. VIN" (toc12/toc13) and explicitly stated in the General Description.
What is the key difference between MAX16939ATESB/V+T and MAX16935ATESB/V+T?
The primary functional difference is overvoltage protection: MAX16939ATESB/V+T triggers at 105% of VOUT (rising), while MAX16935ATESB/V+T triggers at 107%. Additionally, MAX16939ATESB/V+T has a higher skip-mode current threshold (200–500mA vs. 150–400mA), optimizing light-load efficiency in higher-current automotive subsystems.
Does the MAX16939ATESB/V+T require an external Schottky diode?
Yes - despite integrating both high-side and low-side MOSFETs, the MAX16939ATESB/V+T requires an external Schottky diode connected from LX to AGND. This is explicitly stated in the General Description and Detailed Description sections, and confirmed in the Pin Descriptions (LX function). The diode supports full-load operation and improves efficiency over diode-only topologies.
What package type and thermal performance does the MAX16939ATESB/V+T use?
The MAX16939ATESB/V+T uses a 16-pin 5mm × 5mm TQFN-EP package with exposed pad. Its thermal resistance is θJA = 35°C/W (JEDEC 51 multilayer board), and θJC = 2.7°C/W. These values are specified in the Package Thermal Characteristics table and validated per JEDEC JESD51-7 methodology - critical for thermal design in sealed automotive enclosures.
MAX16939ATESB/V+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V (3.3V)
- Voltage - Output (Max):
- 10V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 220kHz ~ 2.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (5x5)
MAX16939ATESB/V+T FAQ
1.How can I place an order for MAX16939ATESB/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16939ATESB/V+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 MAX16939ATESB/V+T reliable?
The price and inventory of MAX16939ATESB/V+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16939ATESB/V+T is usually 5 days.
3.What payment methods are accepted for MAX16939ATESB/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16939ATESB/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16939ATESB/V+T?
MAX16939ATESB/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16939ATESB/V+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 MAX16939ATESB/V+T?
For technical support, including MAX16939ATESB/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16939ATESB/V+T requirements.
6.How does Aetrix verify that MAX16939ATESB/V+T is sourced from the original manufacturer or authorized distributors?
All MAX16939ATESB/V+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 MAX16939ATESB/V+T meets industry standards.
7.What is the process for return or replacement of MAX16939ATESB/V+T?
All MAX16939ATESB/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16939ATESB/V+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 MAX16939ATESB/V+T part is unused and in its original packaging.
Return procedure for MAX16939ATESB/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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