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Analog Devices Inc./Maxim Integrated MAX16939ATESB/V+
- Part No.:
- MAX16939ATESB/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16939ATESB/V+.pdf
- Description:
- IC REG BUCK ADJ/1V 3.5A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,152
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Product details
Overview
MAX16939ATESB/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 MAX16939ATESB/V+ datasheet, MAX16939ATESB/V+ pinout, MAX16939ATESB/V+ application, or MAX16939ATESB/V+ equivalent, key selection criteria include its AEC-Q100 qualification, 98% max duty cycle for cold-crank support, tight 105% overvoltage protection threshold, 180° out-of-phase SYNCOUT for cascaded supplies, and FPWM/skip mode selectability via FSYNC.
Technical Context
The MAX16939ATESB/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 and SUPSW) decouple logic and switch driver power domains, supporting undervoltage transients down to 3.5V while maintaining regulation via 98% duty cycle capability.
It integrates a 5V BIAS LDO (4.7–5.4V, ±2% over temperature), a precision 1.0V FB reference (±1.5% over -40°C to +125°C), and automatic LX slew-rate adjustment (4ns at >1.1MHz, 8ns otherwise) to optimize EMI-efficiency trade-offs. Overvoltage protection triggers at 105% of VOUT (monitored at FB), with fast recovery after fault clearance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports automotive battery transients including cold crank (≥3.5V) and load dump (42V tolerant) |
| Output Current | 3.5A continuous - enables single-chip 5V/3.5A point-of-load supply without external pass devices |
| Quiescent Current | 28µA at no load - meets ultra-low standby power requirements for always-on automotive modules |
| Switching Frequency | 220kHz to 2.2MHz (resistor-programmable) - allows optimization of inductor size, efficiency, and EMI filtering |
| Output Voltage Accuracy | ±2% at 5V fixed output - ensures reliable downstream logic and analog circuit operation without trimming |
| OVP Threshold | 105% of regulated output (monitored at FB) - tighter than MAX16935's 107%, critical for protecting 5V-tolerant ICs |
| Operating Temperature | -40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and dashboard mounting |
Pinout & Package
MAX16939ATESB/V+ is housed in a 16-pin, 5mm × 5mm TQFN-EP package with exposed thermal pad (EP) connected to PGND. The package supports high-power dissipation (θJA = 35°C/W) and requires soldering to a large contiguous copper ground plane for thermal reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – SYNCOUT | Open-drain clock output | Provides 180° out-of-phase signal relative to internal oscillator - enables interleaved operation with second MAX16939 for higher-current cascaded supplies |
| 2 – FSYNC | Mode-select & sync input | Logic-level control: AGND = skip mode; BIAS or external clock = forced PWM - eliminates frequency variation for RF transceiver power |
| 3 – FOSC | Frequency-setting input | Resistor-to-AGND sets fSW; 12kΩ yields 2.2MHz - enables compact magnetics and reduced output capacitance |
| 4 – OUT | Regulated output node | Delivers 5V @ 3.5A; also powers internal circuitry when VOUT ≥ 3V - simplifies biasing in standalone applications |
| 5 – FB | Feedback input | Monitors output via resistive divider or direct connection to BIAS for fixed 5V - 1.0V reference enables precise 1V–10V adjustable outputs |
| 6 – COMP | Error amplifier output | Connects to RC compensation network - stabilizes loop response across full load and temperature range |
| 7 – BIAS | Integrated 5V LDO output | Supplies internal analog blocks; bypassed with 1µF ceramic - eliminates need for external bias rail in most designs |
| 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 | Requires 0.1µF capacitor between BST and LX - ensures proper bootstrap charging for high-side MOSFET conduction |
| 10 – EN | Enable input | 3.3V–42V compatible; 2.4V threshold - allows direct connection to KL30 battery or CAN transceiver INH pin |
| 11 – SUP | Main supply input | Powers internal LDO; bypassed with 4.7µF ceramic - filters noise on logic supply domain |
| 12 – SUPSW | Switch supply input | Powers high-side driver; bypassed with 0.1µF + 4.7µF ceramics - isolates switch noise from analog supply |
| 13–14 – LX | Switch node | Connects to Schottky diode cathode and inductor - high dv/dt node requiring careful layout and optional RC filter for >1.8MHz operation |
| 15 – PGND | Power ground | Low-impedance return path for high-current switch and output capacitor - must be tied to EP and separated from AGND at single point |
| 16 – PGOOD | Open-drain power-good | Asserts high when VOUT > 95% of regulation; deasserts at <92% - enables safe power sequencing with microcontrollers and FPGAs |
| EP – Exposed Pad | Thermal & power ground | Must connect to large PGND copper area - primary thermal path; not a substitute for PGND pin connections |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.5A high-side + low-side MOSFETs | Eliminates external power switches and reduces BOM count by ≥4 components versus controller-based solutions |
| 180° out-of-phase SYNCOUT | Enables two MAX16939ATESB/V+ devices to operate interleaved - cuts input/output ripple current by ~70% vs. parallel non-interleaved |
| Tight 105% overvoltage protection | Prevents damage to 5V-tolerant downstream ICs during transient faults - stricter than MAX16935's 107% threshold |
| Automatic LX slew-rate control | Adjusts gate drive rise time (4ns/8ns) based on fSW - optimizes EMI reduction without sacrificing efficiency at high frequencies |
| AEC-Q100 Grade 1 qualification | Validated for automotive use from -40°C to +125°C ambient - includes stress testing for temperature cycling, HAST, and ESD |
| 28µA quiescent current | Meets ISO 16750-2 "parking mode" requirements - enables >1-year battery life in always-on telematics modules |
Applications
| Navigation Head Units | RF Transceiver Power Supplies |
|---|---|
Use Scenario: Powering display controllers, GPS baseband processors, and audio DACs in automotive infotainment head units. IC Role / Device Role / Timing Role: Primary 5V/3.5A POL regulator delivering clean, sequenced power with PGOOD signaling. Use Value: 98% duty cycle maintains regulation during cold-crank events (down to 3.5V), preventing system reset. |
Use Scenario: Supplying 5V to LTE/Wi-Fi/BT transceivers in vehicle telematics modules where spectral purity is critical. IC Role / Device Role / Timing Role: Fixed-frequency FPWM-mode regulator synchronized to system clock to suppress switching harmonics in RF bands. Use Value: FSYNC-controlled FPWM eliminates variable-frequency noise that would otherwise desensitize receiver front-ends. |
| Distributed Automotive DC Systems | Industrial Control Panels |
Use Scenario: Cascading multiple power rails in zone controllers using daisy-chained SYNCOUT signals. IC Role / Device Role / Timing Role: Master/slave buck converter with 180° phase-shifted SYNCOUT enabling interleaved operation. Use Value: Reduces input capacitor RMS current by ~50% and output voltage ripple by ~70% versus single-phase design. |
Use Scenario: Providing robust 5V supply for PLC I/O modules operating in harsh industrial environments with wide input voltage swings. IC Role / Device Role / Timing Role: High-reliability step-down regulator with thermal shutdown, cycle-by-cycle current limit, and AEC-Q100-grade construction. Use Value: Withstands 42V load-dump transients and operates continuously from -40°C to +125°C ambient. |
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+ | Same pinout and package; 107% OVP threshold (vs. 105%); no spread-spectrum option available | Suitable for general-purpose automotive 5V rails where tighter OVP is not required | Select MAX16935ATESB/V+ only if 107% OVP margin is acceptable and spread-spectrum EMI reduction is unnecessary |
| LM61480QRNXTQ1 | 3.5A, 36V, 2.1MHz; 15µA IQ; no integrated low-side FET; requires external diode or synchronous rectifier | Lacks integrated low-side MOSFET and 180° SYNCOUT - cannot support true FPWM light-load operation or interleaving | Choose LM61480QRNXTQ1 only when lower IQ is prioritized over FPWM capability and board space permits external FET + diode |
Compared with MAX16935ATESB/V+, the MAX16939ATESB/V+ provides tighter overvoltage protection and factory-enabled spread-spectrum modulation; compared with LM61480QRNXTQ1, it delivers integrated FPWM operation and cascading capability at the cost of slightly higher quiescent current.
Availability
MAX16939ATESB/V+ is available at Aetrix Electronics and suitable for automotive infotainment, telematics, and industrial control applications requiring stable component supply, AEC-Q100 compliance, and high-reliability power conversion under wide-input-voltage conditions.
Supply support for MAX16939ATESB/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) 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 was designed specifically for automotive power systems requiring wide-input operation, ultra-low quiescent current, and robust transient handling - targeting navigation units, ADAS domain controllers, and body electronics.
FAQ
What is the overvoltage protection threshold of the MAX16939ATESB/V+?
The MAX16939ATESB/V+ features a fixed overvoltage protection threshold of 105% of the regulated output voltage, monitored at the FB pin. This is tighter than the MAX16935's 107% threshold and helps protect downstream 5V-tolerant components during transient faults. The protection circuit forces the high-side switch off and activates the low-side switch until negative-current limit is reached, then shuts down both switches.
Does the MAX16939ATESB/V+ support forced PWM (FPWM) mode at light loads?
Yes, the MAX16939ATESB/V+ supports fixed-frequency forced PWM mode under all load conditions via the FSYNC pin. When FSYNC is driven high (to BIAS or an external clock), the internal low-side MOSFET remains active, eliminating pulse-skipping and maintaining constant switching frequency - essential for EMI-sensitive RF power supply designs.
What package type and thermal characteristics does the MAX16939ATESB/V+ use?
The MAX16939ATESB/V+ uses a 16-pin 5mm × 5mm TQFN-EP package with exposed thermal pad. Its junction-to-ambient thermal resistance is 35°C/W (JEDEC 51 multilayer board), and junction-to-case is 2.7°C/W. The EP must be soldered to a large PGND copper area - it is not a substitute for the PGND pin connection but serves as the primary thermal conduction path.
Can the MAX16939ATESB/V+ operate during automotive cold-crank conditions?
Yes, the MAX16939ATESB/V+ supports cold-crank operation down to 3.5V input thanks to its 98% maximum duty cycle capability and dual-supply architecture (SUP/SUPSW). During low-VIN events, it sustains regulation by extending on-time, ensuring uninterrupted power to critical systems like navigation processors and CAN interfaces.
How is the switching frequency set on the MAX16939ATESB/V+?
The switching frequency of the MAX16939ATESB/V+ is set using a resistor (RFOSC) connected from the FOSC pin to AGND. For example, a 12kΩ resistor programs 2.2MHz, while 73.2kΩ yields 400kHz. The relationship is nonlinear and documented in Figure 3 of the datasheet; frequency tolerance is ±10% over temperature and input voltage.
MAX16939ATESB/V+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX16939ATESB/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16939ATESB/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 MAX16939ATESB/V+ reliable?
The price and inventory of MAX16939ATESB/V+ 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+ is usually 5 days.
3.What payment methods are accepted for MAX16939ATESB/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16939ATESB/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16939ATESB/V+?
MAX16939ATESB/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16939ATESB/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 MAX16939ATESB/V+?
For technical support, including MAX16939ATESB/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16939ATESB/V+ requirements.
6.How does Aetrix verify that MAX16939ATESB/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16939ATESB/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 MAX16939ATESB/V+ meets industry standards.
7.What is the process for return or replacement of MAX16939ATESB/V+?
All MAX16939ATESB/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16939ATESB/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 MAX16939ATESB/V+ part is unused and in its original packaging.
Return procedure for MAX16939ATESB/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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