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Analog Devices Inc./Maxim Integrated MAX16935RATE/V+T
- Part No.:
- MAX16935RATE/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16935RATE/V+T.pdf
- Description:
- IC REG BUCK ADJ/1V 3.5A 16TQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
The MAX16935RATE/V+T from Maxim Integrated is a 3.5A, current-mode synchronous step-down DC-DC converter with integrated high-side and low-side MOSFETs, designed for automotive power systems requiring 3.5V–36V input operation, 28µA no-load quiescent current, 220kHz–2.2MHz resistor-programmable switching frequency, and fixed 5V output voltage with ±2% accuracy. It supports forced-PWM (FPWM) or skip mode via FSYNC control and delivers robust performance in navigation head units and RF-sensitive power rails.
For engineers reviewing the MAX16935RATE/V+T datasheet, MAX16935RATE/V+T pinout, MAX16935RATE/V+T application, or MAX16935RATE/V+T equivalent, key selection criteria include its AEC-Q100 qualification, 98% max duty cycle for cold-crank support, 180° out-of-phase SYNCOUT for cascaded supplies, spread-spectrum EMI reduction, and thermal shutdown with automatic recovery - all validated across –40°C to +125°C.
Technical Context
This device implements a current-mode control architecture with internal slope compensation, enabling stable regulation under wide VIN/VOUT ratios and transient conditions. Its dual supply inputs (SUP and SUPSW) decouple logic and power-switch domains, supporting undervoltage transients down to 3.5V while maintaining 98% duty cycle capability.
The integrated 3.5A high-side MOSFET (RON_H = 100–220mΩ) and low-side MOSFET (RON_L = 1.5–3Ω) operate with external Schottky diode assistance for efficiency optimization. Automatic LX slew-rate adjustment (4ns at >1.1MHz, 8ns at <1.1MHz) dynamically balances EMI suppression and switching loss across the full 220kHz–2.2MHz frequency range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V; supports automotive load-dump (42V tolerant) and cold-crank transients |
| Output Voltage | Fixed 5V ±2%; regulated via internal 1.0V FB reference and precision resistive divider |
| Max Output Current | 3.5A continuous; limited by internal cycle-by-cycle current sensing (ILX = 4.2–6.2A peak) |
| Quiescent Current | 28µA at no load; enables always-on automotive subsystems with minimal battery drain |
| Switching Frequency | 220kHz–2.2MHz; resistor-programmable (RFOSC), externally synchronizable, with spread-spectrum option |
| Operating Temperature | –40°C to +125°C; qualified per AEC-Q100 Grade 1 for under-hood automotive use |
| Protection Features | Cycle-by-cycle overcurrent, thermal shutdown (175°C trip, 15°C hysteresis), overvoltage (107% of VOUT), and power-good monitoring |
Pinout & Package
MAX16935RATE/V+T is housed in a 16-pin, 5mm × 5mm TQFN-EP package with exposed pad connected to PGND for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – SYNCOUT | Open-drain clock output | 180° out-of-phase signal relative to internal oscillator; enables synchronized cascaded power supplies |
| 2 – FSYNC | Mode-select synchronization input | Logic-level control: AGND = skip mode; BIAS/external clock = forced-PWM; enables EMI-optimized operation |
| 3 – FOSC | Frequency-setting input | Resistor-to-AGND sets switching frequency (220kHz–2.2MHz); determines inductor size and ripple trade-offs |
| 4 – OUT | Regulated output node | Delivers 5V ±2% at up to 3.5A; powers downstream circuitry and internal bias during standby |
| 5 – FB | Feedback input | Monitors output via resistive divider; connects directly to BIAS for fixed 5V configuration |
| 6 – COMP | Error amplifier output | Connects RC compensation network to AGND; stabilizes loop response across load/temperature |
| 7 – BIAS | Internal 5V LDO output | Powers internal analog blocks; requires 1µF ceramic bypass to AGND for noise immunity |
| 8 – AGND | Analog ground reference | Separate ground for sensitive analog circuitry; must be star-connected to PGND at single point |
| 9 – BST | High-side gate driver supply | Bootstrap capacitor (0.1µF) between BST and LX enables high-side MOSFET drive above VIN |
| 10 – EN | Enable input | 3.3V–42V compatible; logic-high enables regulator; logic-low forces 5µA shutdown current |
| 11 – SUP | Main supply input | Powers internal LDO (BIAS); bypassed with 4.7µF ceramic to PGND; supports 3.5V cold-crank |
| 12 – SUPSW | Switch supply input | Powers internal power switches; bypassed with 0.1µF + 4.7µF ceramics to PGND |
| 13–14 – LX | Switching node | Connects to external Schottky diode cathode and inductor; slew rate auto-adjusted for EMI/efficiency balance |
| 15 – PGND | Power ground | High-current return path for LX, SUPSW, and output capacitor; tied to EP for thermal conduction |
| 16 – PGOOD | Open-drain power-good output | Active-low signal asserts when VOUT ≥95% of regulation; deasserts at ≤92%; enables safe power sequencing |
| EP – Exposed Pad | Thermal and electrical ground | Must be soldered to large copper pour connected to PGND; not sole ground connection |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.5A high-side switch | Eliminates external high-side MOSFET and driver; reduces BOM count and layout area in space-constrained automotive modules |
| 180° out-of-phase SYNCOUT | Enables interleaved operation with second MAX16935/MAX16939 to halve input/output ripple and increase total power capacity |
| Automatic LX slew-rate control | Adjusts gate drive rise time (4ns/8ns) based on selected fSW to minimize EMI without sacrificing efficiency |
| Spread-spectrum modulation | ±6% frequency dithering centered on fOSC reduces peak EMI emissions by up to 10dB in narrowband measurements |
| AEC-Q100 Grade 1 qualification | Validated for automotive under-hood environments including temperature cycling, humidity, and mechanical shock |
Applications
| Navigation Head Unit Power Supply | RF Transceiver Bias Rail |
|---|---|
Use Scenario: Powering infotainment display, GPS module, and audio DSP in automotive center-stack head units subject to 12V battery fluctuations and cold-crank events. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering stable, low-noise power with fast transient response and cold-crank support down to 3.5V. Use Value: 98% max duty cycle maintains regulation during engine start; 28µA quiescent current prevents battery drain during vehicle sleep mode. | Use Scenario: Supplying clean, low-EMI 5V bias to cellular/Wi-Fi/Bluetooth RF transceivers in telematics control units where spectral purity is critical. IC Role / Device Role / Timing Role: Fixed-frequency FPWM-mode regulator synchronized to system clock to eliminate frequency jitter and suppress conducted emissions. Use Value: Forced-PWM eliminates variable switching frequency; spread-spectrum option further reduces narrowband EMI peaks near RF bands. |
| Distributed Automotive Body Control Module | Industrial CAN Node Power |
Use Scenario: Providing local 5V power to door modules, seat controllers, and mirror actuators in distributed body electronics architecture. IC Role / Device Role / Timing Role: Point-of-load regulator with power-good signaling for coordinated startup/shutdown sequencing across multiple ECUs. Use Value: PGOOD output enables safe enable/disable timing; AEC-Q100 qualification ensures reliability in harsh vibration/temperature environments. | Use Scenario: Generating isolated 5V rail for CAN FD transceivers and microcontrollers in industrial gateways operating from 24V DC bus with surge transients. IC Role / Device Role / Timing Role: High-input-voltage buck converter with 42V tolerance and thermal shutdown protecting against overloads and ambient overheating. Use Value: 36V max input with 42V absolute rating withstands IEC 61000-4-5 surges; thermal shutdown with automatic recovery ensures fault resilience. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16939RATE/V+T | Lower OVP threshold (105% vs. 107%); identical pinout, package, and electrical specs otherwise | Better suited for systems requiring tighter output overvoltage clamping, e.g., sensitive analog sensor interfaces | Select MAX16939RATE/V+T only if tighter OVP is required; otherwise MAX16935RATE/V+T offers broader margin |
| LM61480QRNXTQ1 | 4.5A rated, 3.5V–36V input, 2.1MHz max fSW, but lacks SYNCOUT, spread-spectrum, and AEC-Q100 Grade 1 certification | Targeted at cost-sensitive industrial applications; not qualified for automotive under-hood use | Choose LM61480QRNXTQ1 only for non-automotive designs where AEC-Q100 and SYNCOUT are unnecessary |
Compared with MAX16939RATE/V+T, the MAX16935RATE/V+T provides higher overvoltage protection threshold and identical automotive qualification; versus LM61480QRNXTQ1, it adds AEC-Q100 Grade 1, 180° SYNCOUT, and factory-enabled spread-spectrum - critical for EMI-sensitive automotive RF systems.
Availability
MAX16935RATE/V+T is available at Aetrix Electronics and suitable for automotive navigation systems, RF transceiver bias rails, distributed body control modules, and industrial CAN node power supplies requiring stable component supply with long-term lifecycle assurance.
Supply support for MAX16935RATE/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 high-performance analog and mixed-signal ICs for automotive, industrial, and communications markets with emphasis on power efficiency, reliability, and integration.
The MAX16935/MAX16939 product line targets automotive power conversion with AEC-Q100 qualification, cold-crank support, and EMI-optimized features for infotainment, ADAS, and body electronics.
FAQ
What is the output voltage configuration of the MAX16935RATE/V+T?
The MAX16935RATE/V+T is configured for fixed 5V output. This is achieved by connecting the FB pin directly to the BIAS pin, which references the internal 1.0V feedback comparator. The device guarantees ±2% output accuracy over temperature and line/load conditions, with typical regulation of 4.9V–5.1V in FPWM mode and 4.9V–5.15V in skip mode.
Does the MAX16935RATE/V+T require an external Schottky diode?
Yes, the MAX16935RATE/V+T requires an external Schottky diode connected between the LX pin and AGND. Although it integrates both high-side and low-side MOSFETs, the diode assists in light-load efficiency and ensures reliable operation across the full 3.5A load range - particularly during discontinuous conduction mode and transient recovery.
How does the FSYNC pin control operating mode in the MAX16935RATE/V+T?
The FSYNC pin selects between skip mode and forced-PWM (FPWM) mode. When pulled to AGND, the MAX16935RATE/V+T operates in skip mode for highest light-load efficiency. When driven high (to BIAS or an external clock), it enters FPWM mode - maintaining constant switching frequency to minimize EMI, especially critical in RF transceiver power supplies.
What thermal protection features does the MAX16935RATE/V+T include?
The MAX16935RATE/V+T includes thermal shutdown with automatic recovery, triggered at +175°C junction temperature (typical) and releasing after cooling by 15°C hysteresis. It also specifies junction-to-ambient thermal resistance of 35°C/W (TQFN) and includes derating curves for continuous power dissipation up to +70°C ambient, ensuring safe operation in sealed automotive enclosures.
Is the MAX16935RATE/V+T AEC-Q100 qualified?
Yes, the MAX16935RATE/V+T is AEC-Q100 qualified per Grade 1 standards (–40°C to +125°C ambient), including stress testing for temperature cycling, humidity, and mechanical shock. This qualification validates its suitability for automotive under-hood and cabin applications such as navigation head units and body control modules.
MAX16935RATE/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)
MAX16935RATE/V+T FAQ
1.How can I place an order for MAX16935RATE/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16935RATE/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 MAX16935RATE/V+T reliable?
The price and inventory of MAX16935RATE/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 MAX16935RATE/V+T is usually 5 days.
3.What payment methods are accepted for MAX16935RATE/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16935RATE/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16935RATE/V+T?
MAX16935RATE/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16935RATE/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 MAX16935RATE/V+T?
For technical support, including MAX16935RATE/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16935RATE/V+T requirements.
6.How does Aetrix verify that MAX16935RATE/V+T is sourced from the original manufacturer or authorized distributors?
All MAX16935RATE/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 MAX16935RATE/V+T meets industry standards.
7.What is the process for return or replacement of MAX16935RATE/V+T?
All MAX16935RATE/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16935RATE/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 MAX16935RATE/V+T part is unused and in its original packaging.
Return procedure for MAX16935RATE/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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