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Analog Devices Inc./Maxim Integrated MAX16939ATERB/V+
- Part No.:
- MAX16939ATERB/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16939ATERB/V+.pdf
- Description:
- IC REG BUCK ADJ/1V 3.5A 16TQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX16939ATERB/V+ 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 MAX16939ATERB/V+ datasheet, MAX16939ATERB/V+ pinout, MAX16939ATERB/V+ application, or MAX16939ATERB/V+ equivalent, key selection criteria include AEC-Q100 qualification, 98% max duty cycle for cold-crank support, tight overvoltage protection (105% threshold), 180° out-of-phase SYNCOUT for cascaded supplies, and FPWM/skip mode control via FSYNC pin.
Technical Context
The MAX16939ATERB/V+ implements a current-mode control architecture with internal slope compensation, enabling stable operation across wide VIN (3.5V–36V) and load (0–3.5A) ranges. Its dual-supply inputs (SUP/SUPSW) decouple logic and switch biasing, supporting undervoltage transients down to 3.5V while maintaining regulation via 98% duty cycle capability.
It features automatic LX slew-rate adjustment (4ns at >1.1MHz, 8ns otherwise), spread-spectrum modulation (±6%, factory-enabled), and a dedicated 5V BIAS LDO (4.7–5.4V, ±3% UVLO hysteresis) that powers internal circuitry and enables direct FB-to-BIAS connection for fixed 5V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V (42V tolerant); supports automotive cold-crank and load-dump conditions without external protection. |
| Output Voltage | Fixed 5V ±2% (FB tied to BIAS); no external feedback resistors required for standard rail generation. |
| Max Output Current | 3.5A continuous; validated with 2.2µH inductor and 22µF output capacitance per typical application circuit. |
| Quiescent Current | 28µA at no load; enables always-on subsystems in automotive body electronics with minimal battery drain. |
| Switching Frequency | Resistor-programmable 220kHz–2.2MHz; allows optimization of size (high-freq) vs. efficiency (low-freq) and EMI filtering requirements. |
| OVP Threshold | 105% of regulated output (5.25V typ); tighter than MAX16935's 107%, reducing overshoot during line transients. |
| Thermal Protection | 175°C shutdown with 15°C hysteresis; ensures safe operation under sustained overload or poor PCB thermal design. |
Pinout & Package
MAX16939ATERB/V+ is housed in a 16-pin 5mm × 5mm TQFN-EP package with exposed pad connected to PGND for thermal dissipation. Pin count, layout, and thermal resistance (θJA = 35°C/W) match JEDEC MS-012AC specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – SYNCOUT | Open-drain clock output | 180° out-of-phase signal relative to internal oscillator; enables interleaved operation with second MAX16939 for higher-current supplies. |
| 2 – FSYNC | Mode-select logic input | Drives high or connects to external clock for FPWM; grounded for skip mode-directly controls EMI behavior without firmware. |
| 3 – FOSC | Frequency-setting node | Connects to AGND via resistor (e.g., 12kΩ for 2.2MHz); sets fSW with ±10% tolerance over temperature. |
| 4 – OUT | Power output / internal supply | Delivers regulated 5V; also powers internal circuitry when VOUT ≥ 3V, eliminating need for separate bias rail. |
| 5 – FB | Feedback reference input | Connected to BIAS for fixed 5V; externally divided for adjustable outputs (1V–10V) with 1.0V ±1.5% reference accuracy. |
| 9 – BST | High-side gate driver supply | Requires 0.1µF ceramic capacitor between BST and LX; critical for proper high-side MOSFET turn-on and efficiency. |
| 10 – EN | Enable input | 3.3V–42V compatible; asserts device from shutdown (5µA IQ) with 2.4V threshold and 0.2V hysteresis for noise immunity. |
| 11 – SUP | Main logic supply input | Powers internal LDO and control logic; bypassed with 4.7µF ceramic capacitor to PGND for stability. |
| 12 – SUPSW | Switch supply input | Separately powers high-side/low-side drivers; bypassed with 0.1µF + 4.7µF ceramics to handle high di/dt during switching. |
| 13/14 – LX | Switching node | Connects to Schottky diode cathode and inductor; requires external diode for full 3.5A operation despite integrated MOSFETs. |
| 15 – PGND | Power ground return | Dedicated low-impedance path for inductor current and diode return; must be isolated from AGND except at single-point star ground. |
| 16 – PGOOD | Open-drain power-good flag | Asserts high when VOUT ≥ 95% (4.75V), deasserts at ≤92% (4.6V); used for sequencing with µC or PMIC. |
Key Features
| Feature | Design Value |
|---|---|
| Tight Overvoltage Protection | 105% OVP threshold (vs. 107% on MAX16935) minimizes output overshoot during line transients-critical for downstream 5V logic. |
| 180° Out-of-Phase SYNCOUT | Enables two MAX16939ATERB/V+ devices to drive parallel inductors with 50% phase shift, halving input/output ripple current and reducing EMI peaks. |
| Automatic LX Slew-Rate Control | Adjusts high-side gate drive rise time (4ns at >1.1MHz, 8ns otherwise) to balance EMI suppression and conduction loss without external tuning. |
| AEC-Q100 Qualified | Validated for automotive Grade-2 (-40°C to +125°C ambient) operation with full temperature-range electrical testing and reliability stress screening. |
| Spread-Spectrum Modulation | ±6% frequency dither centered on fOSC (e.g., 2.2MHz ±132kHz) reduces peak EMI amplitude by >10dB without altering average switching frequency. |
Applications
| Navigation Head Units | RF Transceiver Power Rails |
|---|---|
Use Scenario: Powering display controller, audio codec, and GPS baseband ICs in automotive infotainment head units operating across battery voltage range (5.5V–16V) with cold-crank support. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering 3.5A with FPWM mode enabled via FSYNC to suppress switching noise near sensitive RF receivers. Use Value: 28µA quiescent current extends battery life in accessory-off state; 98% duty cycle maintains regulation during 4.5V cold-crank events. | Use Scenario: Supplying clean 5V power to LTE/Wi-Fi transceivers in telematics control units where conducted EMI must meet CISPR 25 Class 5 limits. IC Role / Device Role / Timing Role: Fixed-frequency forced-PWM (FPWM) converter synchronized to system clock via FSYNC pin to eliminate spectral spreading and enable precise EMI filter design. Use Value: Spread-spectrum disabled when synced externally, but 180° SYNCOUT allows interleaving with secondary supply to cancel input ripple harmonics. |
| Automotive Body Control Modules | Distributed DC Power Systems |
Use Scenario: Providing always-on 5V rail for CAN transceiver, watchdog timer, and microcontroller in door modules and seat controllers. IC Role / Device Role / Timing Role: Skip-mode operation during sleep states (ILOAD < 200mA) to minimize no-load current; FPWM re-enabled on wake-up via EN assertion. Use Value: 5µA shutdown current and 28µA standby current meet OEM low-power requirements for Class 3/4 modules. | Use Scenario: Cascading multiple MAX16939ATERB/V+ devices in distributed architecture for centralized 12V-to-5V conversion feeding multiple ECUs. IC Role / Device Role / Timing Role: Master-slave configuration using SYNCOUT (180° phase) and FSYNC pins to interleave switching and reduce input capacitor RMS current by 30%. Use Value: Enables smaller bulk capacitors and lower-cost input filtering while maintaining total 10.5A output capacity across three devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16935ATERB/V+ | Same pinout and package; 107% OVP threshold, no spread-spectrum option, identical FPWM/skip mode control. | Suitable for non-RF applications where tighter OVP is not required; slightly higher output overshoot during transients. | Select MAX16935ATERB/V+ only if OVP margin >105% is acceptable and spread-spectrum is unnecessary. |
| LM61480QRNXTQ1 | 3.5A, 36V, 2.1MHz sync-buck; no integrated low-side FET; requires external high-side/low-side drivers or dual-MOSFET discrete solution. | Higher BOM count due to external MOSFETs and gate drivers; lacks 180° SYNCOUT and BIAS LDO for self-biasing. | Choose LM61480QRNXTQ1 only when higher efficiency at light loads (no low-side FET losses) outweighs added complexity and missing features. |
Compared with MAX16935ATERB/V+, MAX16939ATERB/V+ provides tighter overvoltage protection and factory-enabled spread-spectrum-critical for RF-sensitive designs-while LM61480QRNXTQ1 trades integration for peak efficiency but requires additional components and lacks cascading clock support.
Availability
MAX16939ATERB/V+ is available at Aetrix Electronics and suitable for automotive infotainment systems, telematics control units, and body electronics requiring stable component supply with AEC-Q100 compliance, extended temperature operation, and low-quiescent-current performance.
Supply support for MAX16939ATERB/V+ 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 delivers high-efficiency, AEC-Q100-qualified DC-DC converters optimized for automotive power rails-specifically addressing cold-crank resilience, EMI control, and seamless power-supply sequencing in safety-critical systems.
FAQ
What is the maximum duty cycle supported by the MAX16939ATERB/V+?
The MAX16939ATERB/V+ supports up to 98% maximum duty cycle, enabling regulation during severe undervoltage transients such as automotive cold-crank events down to 3.5V input. This capability is implemented through adaptive control logic that extends on-time without compromising stability, and is validated across the full -40°C to +125°C operating range. The MAX16939ATERB/V+ maintains output regulation even when input drops below nominal battery voltage.
Does the MAX16939ATERB/V+ require an external Schottky diode despite having integrated MOSFETs?
Yes, the MAX16939ATERB/V+ requires an external Schottky diode connected between LX and AGND. Although it integrates both high-side and low-side MOSFETs, the diode is necessary to support full 3.5A continuous output current and ensure reliable operation across temperature and process variations. The diode conducts during low-side FET dead time and improves light-load efficiency in skip mode. Typical designs use a 3A, 40V Schottky (e.g., SB340) placed adjacent to the LX pin.
How does the MAX16939ATERB/V+ implement spread-spectrum modulation?
The MAX16939ATERB/V+ implements factory-enabled spread-spectrum modulation by varying its internal oscillator frequency ±6% around the programmed center frequency (e.g., 2.2MHz ±132kHz) using a triangular waveform with 110µs period. This dithering reduces peak EMI amplitudes without affecting average frequency or regulation performance. Spread-spectrum is automatically disabled when the device synchronizes to an external clock via the FSYNC pin, but any modulation present on the external clock passes through to SYNCOUT.
What is the function of the BIAS pin on the MAX16939ATERB/V+?
The BIAS pin on the MAX16939ATERB/V+ is a 5V linear regulator output (4.7–5.4V, ±3% UVLO hysteresis) that powers internal analog circuitry and serves as a precision reference for the FB pin. When FB is connected directly to BIAS, the MAX16939ATERB/V+ delivers a fixed 5V output with ±2% accuracy. BIAS must be bypassed with a 1µF ceramic capacitor to AGND, and it can source up to 10mA-sufficient to power external monitoring circuits or level-shifters without additional regulators.
Can the MAX16939ATERB/V+ be synchronized to an external clock, and what are the timing constraints?
Yes, the MAX16939ATERB/V+ can synchronize to an external clock applied to the FSYNC pin. The external clock frequency must be within ±20% of the internal oscillator frequency (e.g., 1.76–2.64MHz for a 2.2MHz internal setting), with minimum pulse width of 100ns. Synchronization occurs within one clock cycle; if the external signal is absent for more than two cycles, the device reverts to internal oscillation. This enables precise EMI control in multi-rail systems and eliminates beat frequencies between independent switching supplies.
MAX16939ATERB/V+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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)
MAX16939ATERB/V+ FAQ
1.How can I place an order for MAX16939ATERB/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16939ATERB/V+ 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 MAX16939ATERB/V+ reliable?
The price and inventory of MAX16939ATERB/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16939ATERB/V+ is usually 5 days.
3.What payment methods are accepted for MAX16939ATERB/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16939ATERB/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16939ATERB/V+?
MAX16939ATERB/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16939ATERB/V+ 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 MAX16939ATERB/V+?
For technical support, including MAX16939ATERB/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16939ATERB/V+ requirements.
6.How does Aetrix verify that MAX16939ATERB/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16939ATERB/V+ 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 MAX16939ATERB/V+ meets industry standards.
7.What is the process for return or replacement of MAX16939ATERB/V+?
All MAX16939ATERB/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16939ATERB/V+, 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 MAX16939ATERB/V+ part is unused and in its original packaging.
Return procedure for MAX16939ATERB/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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