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Analog Devices Inc./Maxim Integrated MAX16939ATERA/V+T
- Part No.:
- MAX16939ATERA/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16939ATERA/V+T.pdf
- Description:
- IC REG BUCK ADJ/1V 3.5A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,123
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Product details
Overview
MAX16939ATERA/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, 28µA quiescent current, resistor-programmable switching frequency (220kHz–2.2MHz), and fixed 5V output voltage (±2% accuracy). It operates across -40°C to +125°C and supports automotive cold-crank and load-dump conditions up to 42V.
For engineers reviewing the MAX16939ATERA/V+T datasheet, MAX16939ATERA/V+T pinout, MAX16939ATERA/V+T application, or MAX16939ATERA/V+T equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade protection features (OVP at 105%, thermal shutdown at +175°C), and real-world power-good sequencing behavior - all specific to the MAX16939ATERA/V+T variant.
Technical Context
The MAX16939ATERA/V+T implements a current-mode control architecture with automatic LX slew-rate adjustment (4ns at >1.1MHz) and integrated 5V BIAS linear regulator. Its dual supply inputs (SUP and SUPSW) enable robust operation during undervoltage transients, sustaining 98% duty cycle to maintain regulation down to 3.5V input.
It features pin-selectable FPWM or skip mode via FSYNC, 180° out-of-phase SYNCOUT for cascaded supplies, and tight overvoltage protection (105% rising threshold, 102% falling threshold) - distinguishing it from the MAX16935 series. The device is AEC-Q100 qualified and includes cycle-by-cycle current limiting, thermal shutdown with 15°C hysteresis, and spread-spectrum modulation (±6%) in factory-enabled versions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V (42V tolerant); supports automotive battery transients including cold crank and load dump. |
| Output Voltage | Fixed 5V ±2% (VFB = 1.0V reference); no external feedback resistors required for nominal operation. |
| Switching Frequency | 220kHz–2.2MHz, resistor-programmable via FOSC pin; synchronizable to external clock (1.8–2.6MHz). |
| Quiescent Current | 28µA at no load; enables always-on systems with ultra-low standby power consumption. |
| Overvoltage Protection | Rising threshold at 105% of VOUT (5.25V), falling threshold at 102% (5.10V); tighter than MAX16935's 107%/105%. |
| Thermal Shutdown | Triggers at +175°C junction temperature with 15°C hysteresis; ensures safe recovery after overheating events. |
| Power-Good Accuracy | PGOOD asserts at ≥95% VFB (4.75V), deasserts at ≤92% VFB (4.60V); enables precise supply sequencing. |
Pinout & Package
MAX16939ATERA/V+T is housed in a 16-pin 5mm × 5mm TQFN-EP package with exposed pad connected to PGND for thermal management. Pin numbering follows standard top-view orientation with EP as thermal ground (not signal ground).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – SYNCOUT | Open-drain clock output | 180° out-of-phase with internal oscillator; used to synchronize cascaded converters without external phase-shift circuitry. |
| 2 – FSYNC | Mode selection & sync input | Logic-high or external clock enables fixed-frequency FPWM; grounded enables skip mode for light-load efficiency. |
| 3 – FOSC | Frequency programming input | Resistor-to-AGND sets switching frequency; 12kΩ yields 2.2MHz (typical for compact high-frequency designs). |
| 4 – OUT | Regulated output node | Delivers 5V/3.5A; powers internal circuitry when VOUT ≥ 3V; connects to output capacitor and load. |
| 5 – FB | Feedback reference input | Internally tied to BIAS for fixed 5V; externally configurable for 1V–10V via resistor divider (not used in this variant). |
| 6 – COMP | Error amplifier output | Connects RC compensation network to AGND; stabilizes loop response for wide VIN/VOUT operating range. |
| 7 – BIAS | Integrated 5V LDO output | Powers internal analog blocks; requires 1µF ceramic bypass to AGND; regulated at 4.7–5.4V over temperature. |
| 8 – AGND | Analog ground reference | Separate from PGND; must be star-connected to minimize noise coupling into feedback and control circuits. |
| 9 – BST | High-side gate driver supply | Connected via 0.1µF capacitor to LX; provides bootstrap voltage for high-side MOSFET drive above VSUPSW. |
| 10 – EN | Enable input | 3.3V–42V logic-compatible; high enables regulation; low forces shutdown (5µA IQ); supports direct KL30 connection. |
| 11 – SUP | Main supply input | Powers internal LDO (BIAS); bypassed with 4.7µF ceramic to PGND; handles full input transient range. |
| 12 – SUPSW | Switch supply input | Powers high-side/low-side MOSFET drivers; bypassed with 0.1µF + 4.7µF ceramics to PGND for low-impedance switching return. |
| 13–14 – LX | Switching node | Connects to Schottky diode cathode and inductor; high dv/dt node requiring tight layout and EMI filtering if needed. |
| 15 – PGND | Power ground | Primary return path for high-current switch paths; must be low-inductance plane connected to EP and input/output capacitors. |
| 16 – PGOOD | Open-drain power-good output | Active-low signal indicating VOUT within 92–95% regulation window; pulled up to BIAS via 10kΩ for sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Tight Overvoltage Protection | 105% rising / 102% falling OVP threshold (vs. 107%/105% on MAX16935), minimizing output overshoot in fault conditions. |
| Automotive-Grade Thermal Management | Junction-to-ambient thermal resistance of 35°C/W (TQFN); supports continuous 3.5A operation at +125°C ambient with proper PCB copper. |
| 180° Out-of-Phase SYNCOUT | Enables interleaved operation with second MAX16939ATERA/V+T to halve input/output ripple and reduce EMI without external timing ICs. |
| FPWM/Skip Mode Selectability | FSYNC pin selects between fixed-frequency PWM (EMI-sensitive RF systems) and skip mode (ultra-low IQ in standby). |
| AEC-Q100 Qualified | Qualified per AEC-Q100 Rev G Grade 0 (−40°C to +150°C junction), ensuring reliability in automotive powertrain and ADAS applications. |
Applications
| Automotive Infotainment Power Supply | ADAS Camera Module DC-DC Stage |
|---|---|
|
Use Scenario: Powers SoC, display interface, and audio codec in head-unit under varying battery conditions (cold crank to load dump). IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering 3.5A with 28µA quiescent current and 98% duty cycle capability during undervoltage. Use Value: Maintains system uptime during 3.5V battery dips; PGOOD enables clean boot sequencing with MCU and PMIC. |
Use Scenario: Supplies image sensor and ISP in rear-view or surround-view camera modules exposed to engine bay temperatures. IC Role / Device Role / Timing Role: High-reliability 5V step-down converter with AEC-Q100 qualification and thermal shutdown at +175°C. Use Value: Survives +125°C ambient; tight OVP prevents sensor latch-up during transients; SYNCOUT enables dual-rail synchronization. |
| Industrial CAN Gateway Power Rail | Telematics Control Unit (TCU) Core Supply |
|
Use Scenario: Generates stable 5V rail for CAN transceiver, microcontroller, and cellular modem in vehicle telematics gateway. IC Role / Device Role / Timing Role: Input-tolerant buck converter with 42V transient protection and EN pin compatible with 3.3V logic or KL30 battery. Use Value: Eliminates need for external TVS or pre-regulator; EN allows MCU-controlled power cycling; PGOOD confirms rail readiness before CAN initialization. |
Use Scenario: Provides core 5V supply for LTE/GNSS SoC and secure element in automotive TCU with always-on connectivity requirements. IC Role / Device Role / Timing Role: Ultra-low-IQ buck converter enabling <100µA system sleep current while maintaining 5V rail availability. Use Value: 28µA quiescent current extends battery backup time; FPWM mode suppresses switching noise near sensitive GNSS front-end. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16935ATERA/V+T | Same pinout and package; 107%/105% OVP thresholds; no spread-spectrum option in base version. | Preferred where looser OVP tolerance is acceptable and cost sensitivity outweighs tighter protection needs. | Select when OVP margin >5% is sufficient and design does not require MAX16939's tighter 105% limit. |
| LM61480QRNXTQ1 | 3.5A, 3V–36V, 2.1MHz max; 15µA IQ; no integrated BIAS LDO; requires external 5V bias or bootstrap. | Better suited for space-constrained layouts needing minimal external components but lacking integrated bias rail. | Choose when board area is critical and system already provides 5V bias; not drop-in due to missing BIAS and different pinout. |
Compared with MAX16935ATERA/V+T, the MAX16939ATERA/V+T offers tighter overvoltage protection for safety-critical loads, while the LM61480QRNXTQ1 reduces quiescent current by 13µA but removes the integrated BIAS LDO - increasing external component count and complicating bias supply design.
Availability
MAX16939ATERA/V+T is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial CAN gateway designs requiring stable component supply, AEC-Q100 compliance, and extended temperature operation.
Supply support for MAX16939ATERA/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) designs precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.
The MAX16935/MAX16939 product line targets automotive power conversion with emphasis on cold-crank resilience, load-dump tolerance, and AEC-Q100 qualification - specifically engineered for infotainment, ADAS, and telematics subsystems.
FAQ
What is the key functional difference between MAX16939ATERA/V+T and MAX16935ATERA/V+T?
The MAX16939ATERA/V+T features tighter overvoltage protection thresholds (105% rising / 102% falling) compared to the MAX16935ATERA/V+T (107% / 105%). This reduces output overshoot during fault conditions, making MAX16939ATERA/V+T preferred for safety-critical automotive loads like image sensors or secure elements where voltage excursions must be minimized.
Does MAX16939ATERA/V+T require an external Schottky diode despite having integrated MOSFETs?
Yes, MAX16939ATERA/V+T requires an external Schottky diode connected from LX to AGND. Although it integrates high-side and low-side MOSFETs, the diode improves light-load efficiency and supports operation during discontinuous conduction mode - a documented requirement in the MAX16939ATERA/V+T datasheet for optimal performance across the full 3.5A load range.
How does the FSYNC pin configure operating mode in MAX16939ATERA/V+T?
In MAX16939ATERA/V+T, connecting FSYNC to AGND enables skip mode for lowest quiescent current; connecting FSYNC to BIAS or an external clock enables fixed-frequency forced-PWM (FPWM) mode. This pin-selectable behavior allows designers to optimize for either light-load efficiency or EMI-controlled fixed-frequency operation without changing firmware or external circuitry.
What is the purpose of the SYNCOUT pin on MAX16939ATERA/V+T, and how is it used?
The SYNCOUT pin on MAX16939ATERA/V+T outputs a 180° out-of-phase open-drain clock signal relative to the internal oscillator. It is used to synchronize a second MAX16939ATERA/V+T in interleaved configuration - reducing input/output ripple, lowering EMI, and enabling higher total output current without increasing individual device stress.
Is MAX16939ATERA/V+T qualified for automotive applications, and what standards does it meet?
Yes, MAX16939ATERA/V+T is AEC-Q100 qualified (Grade 0, −40°C to +150°C junction) and designed for automotive use. It meets stringent requirements for cold-crank (3.5V min), load-dump (42V max), and thermal survival (+175°C shutdown with 15°C hysteresis), making it suitable for infotainment, ADAS, and telematics applications per ISO 16750 and ISO 7637-2.
MAX16939ATERA/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 (5V)
- 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)
MAX16939ATERA/V+T FAQ
1.How can I place an order for MAX16939ATERA/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16939ATERA/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 MAX16939ATERA/V+T reliable?
The price and inventory of MAX16939ATERA/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 MAX16939ATERA/V+T is usually 5 days.
3.What payment methods are accepted for MAX16939ATERA/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16939ATERA/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16939ATERA/V+T?
MAX16939ATERA/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16939ATERA/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 MAX16939ATERA/V+T?
For technical support, including MAX16939ATERA/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16939ATERA/V+T requirements.
6.How does Aetrix verify that MAX16939ATERA/V+T is sourced from the original manufacturer or authorized distributors?
All MAX16939ATERA/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 MAX16939ATERA/V+T meets industry standards.
7.What is the process for return or replacement of MAX16939ATERA/V+T?
All MAX16939ATERA/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16939ATERA/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 MAX16939ATERA/V+T part is unused and in its original packaging.
Return procedure for MAX16939ATERA/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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