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Analog Devices Inc./Maxim Integrated MAX16935CAUER/V+T
- Part No.:
- MAX16935CAUER/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX16935CAUER/V+T.pdf
- Description:
- IC REG STEPDOWN 36V 3.5A 16TSSOP
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Inventory:2,311
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Product details
Overview
MAX16935CAUER/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 supplies operating from 3.5V to 36V input. It delivers fixed 5V output with ±2% accuracy, supports resistor-programmable switching frequency up to 2.2MHz, and features 28µA quiescent current at no load-enabling always-on functionality in vehicle infotainment and ADAS modules.
For engineers reviewing the MAX16935CAUER/V+T datasheet, MAX16935CAUER/V+T pinout, MAX16935CAUER/V+T application, or MAX16935CAUER/V+T equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade thermal and EMI performance, and real-world selection guidance for AEC-Q100-compliant 12V/24V system designs.
Technical Context
The MAX16935CAUER/V+T implements current-mode control with cycle-by-cycle overcurrent protection and automatic LX slew-rate adjustment-4ns rise time at >1.1MHz operation-to minimize EMI while maintaining efficiency. Its dual supply inputs (SUP and SUPSW) enable robust cold-crank support down to 3.5V with 98% maximum duty cycle.
It integrates a 5V BIAS linear regulator (4.7–5.4V output), open-drain PGOOD with 95%/92% VFB thresholds, and SYNCOUT delivering 180° out-of-phase clock for cascaded multi-rail supplies. FSYNC pin selects between skip mode (for ultra-low IQ) and forced-PWM mode (for EMI-sensitive RF transceiver power).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V (42V transient tolerant); supports automotive battery rails including cold-crank and load-dump conditions. |
| Output Current | 3.5A continuous; enables single-chip 5V/3.5A PoL for navigation head units or camera ECUs. |
| Quiescent Current | 28µA at no load; sustains always-on functionality without draining vehicle battery during extended parking. |
| Switching Frequency | 220kHz to 2.2MHz (resistor-programmable via FOSC); higher frequencies allow smaller inductors and reduced output capacitance. |
| Output Voltage Accuracy | ±2% for fixed 5V output; ensures stable logic supply for microcontrollers and sensors across -40°C to +125°C. |
| Thermal Protection | Thermal shutdown at +175°C with 15°C hysteresis; guarantees safe operation under sustained overload or poor heatsinking. |
| AEC-Q100 Grade | Qualified to Grade 1 (-40°C to +125°C junction); certified for front-end automotive power conversion applications. |
Pinout & Package
MAX16935CAUER/V+T is housed in a 16-pin, 5mm × 5mm TQFN-EP package with exposed pad connected to PGND for thermal management. Pin count, layout, and thermal resistance (θJA = 35°C/W) are validated per JEDEC51 on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – SYNCOUT | Open-drain clock output | Delivers 180° out-of-phase signal relative to internal oscillator; enables synchronized cascading of multiple converters for higher power or ripple cancellation. |
| 2 – FSYNC | Mode-select synchronization input | Drives high or connects to external clock for FPWM; grounded for skip mode-directly controls light-load efficiency vs. EMI trade-off. |
| 3 – FOSC | Frequency-setting resistor input | Connects to AGND via RFOSC (e.g., 12kΩ for 2.2MHz); sets switching frequency without external clock source. |
| 4 – OUT | Regulated output node | Provides 5V output; also powers internal circuitry when VOUT is 3–5V, eliminating need for auxiliary bias supply. |
| 5 – FB | Feedback voltage sense input | Connected to BIAS for fixed 5V; or to resistive divider for adjustable 1V–10V output-enables flexible rail generation. |
| 6 – COMP | Error amplifier output | Interface for RC compensation network; stabilizes loop response across full load and temperature range. |
| 7 – BIAS | Integrated 5V LDO output | Powers internal analog blocks; requires 1µF ceramic bypass to AGND-reduces dependency on external regulators. |
| 8 – AGND | Analog ground reference | Separate from PGND to isolate noise-sensitive feedback and error amplifier paths from high-current switching return. |
| 9 – BST | High-side gate driver bootstrap supply | Requires 0.1µF capacitor between BST and LX; enables efficient high-side MOSFET drive without external charge pump. |
| 10 – EN | Enable input | 3.3V–42V logic-compatible; allows direct connection to KL30 or CAN transceiver INH pin for system-level power sequencing. |
| 11 – SUP | Main supply input | Powers internal LDO; bypassed with 4.7µF ceramic capacitor-supports wide VIN range while maintaining stable bias. |
| 12 – SUPSW | Switch supply input | Powers internal high-side/low-side MOSFET drivers; bypassed with 0.1µF + 4.7µF ceramics-decouples switching noise from logic supply. |
| 13–14 – LX | Switching node | Connects to Schottky diode cathode and inductor; high dv/dt node requiring tight layout and external diode for efficiency optimization. |
| 15 – PGND | Power ground | Primary return path for high-current switching loop; must be low-inductance connection to exposed pad and input/output capacitors. |
| 16 – PGOOD | Open-drain power-good monitor | Asserts high when VOUT ≥ 95% of regulation; deasserts at ≤92%; simplifies multi-rail sequencing in ADAS domain controllers. |
| EP – Exposed Pad | Thermal and electrical ground | Must connect to large-area contiguous copper plane tied to PGND; not sole ground path-ensures thermal reliability at full load. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.5A high-side + low-side MOSFETs | Eliminates external switch components and reduces BOM count by 4–6 parts versus discrete controller solutions. |
| 180° out-of-phase SYNCOUT | Enables interleaved operation with second MAX16935CAUER/V+T to halve input/output ripple and reduce EMI filter size. |
| Automatic LX slew-rate control | Adjusts gate drive rise time (4ns at >1.1MHz) to optimize EMI without sacrificing efficiency-no manual tuning required. |
| Spread-spectrum modulation (factory-enabled) | Reduces peak EMI by ±6% frequency dithering-critical for meeting CISPR 25 Class 5 limits in infotainment systems. |
| 98% max duty cycle during undervoltage transients | Maintains regulated 5V output during cold-crank events down to 3.5V input-prevents ECU brownout and system reset. |
| Power-good with 3% hysteresis | Provides clean, glitch-free sequencing signal for downstream processors and FPGAs-no external comparator needed. |
Applications
| Automotive Infotainment Head Unit | ADAS Camera Power Supply |
|---|---|
|
Use Scenario: Powering SoC, display interface, and audio codec in a 12V-based car radio or navigation system with always-on capability. IC Role / Device Role / Timing Role: Primary 5V/3.5A point-of-load regulator supplying core logic rails; manages cold-crank hold-up and load-dump survival. Use Value: 28µA quiescent current prevents battery drain during weeks of vehicle inactivity; AEC-Q100 Grade 1 ensures reliability across all vehicle climates. |
Use Scenario: Providing stable 5V rail to CMOS image sensor and ISP in forward-facing ADAS camera module. IC Role / Device Role / Timing Role: Synchronous buck converter with fast transient response and low-noise PGOOD for sensor initialization timing. Use Value: Fixed 5V ±2% accuracy maintains sensor ADC reference stability; 2.2MHz operation allows <1µH inductor-reducing solution size by 40% vs. 400kHz designs. |
| Industrial Telematics Gateway | Commercial Vehicle Display Controller |
|
Use Scenario: Generating 5V for LTE modem, GNSS receiver, and CAN FD controller in fleet-management telematics unit. IC Role / Device Role / Timing Role: High-efficiency DC-DC with FPWM mode selected via FSYNC to suppress conducted emissions near cellular bands. Use Value: Forced-PWM eliminates frequency variation during light-load idle states-meeting stringent 3GPP radiated emission requirements. |
Use Scenario: Powering 7-inch TFT-LCD display and touch controller in heavy-duty truck dashboard with 24V nominal battery. IC Role / Device Role / Timing Role: Main 5V PoL converter supporting 3.5A peak backlight and processor loads; handles 42V load-dump transients. Use Value: 42V absolute max rating on SUP/SUPSW pins and thermal shutdown with auto-recovery ensure uninterrupted operation during harsh electrical environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16939CAUER/V+T | Lower overvoltage protection threshold (105% vs. 107% of VFB); identical pinout, specs, and package. | Better suited for systems requiring tighter OVP clamping, e.g., FPGA I/O rails with narrow voltage tolerance. | Select MAX16939CAUER/V+T only if OVP margin below 107% is mandatory; otherwise MAX16935CAUER/V+T offers broader compatibility. |
| LM61480QRNLRQ1 | 3.6A, 2.1MHz, 3.5V–36V input; no integrated low-side MOSFET; requires external diode or synchronous rectifier. | Lacks 180° SYNCOUT and spread-spectrum; higher BOM count but supports higher ambient temperatures (150°C). | Choose LM61480QRNLRQ1 for cost-sensitive designs where SYNCOUT and EMI dithering are non-critical and thermal margin exceeds 125°C. |
Compared with MAX16939CAUER/V+T, the MAX16935CAUER/V+T provides higher OVP threshold and identical functional coverage; versus LM61480QRNLRQ1, it delivers lower system-level BOM count and superior EMI control via integrated low-side FET and factory spread-spectrum, at the expense of slightly lower max junction temperature rating.
Availability
MAX16935CAUER/V+T is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial telematics requiring stable component supply with AEC-Q100 qualification, extended temperature operation, and low-quiescent-current performance.
Supply support for MAX16935CAUER/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 was engineered specifically for automotive power conversion-delivering robust 36V-input, low-IQ, AEC-Q100-compliant step-down regulation with integrated MOSFETs and advanced EMI mitigation features.
FAQ
What is the exact output voltage tolerance of the MAX16935CAUER/V+T in fixed 5V mode?
The MAX16935CAUER/V+T delivers 5.0V output with ±2% accuracy over full temperature and line/load conditions-verified as 4.9V to 5.1V in FPWM mode and 4.9V to 5.15V in skip mode per datasheet Electrical Characteristics table. This tolerance ensures reliable operation of 5V-tolerant microcontrollers and interfaces without external trimming.
Does the MAX16935CAUER/V+T require an external Schottky diode, and why?
Yes, the MAX16935CAUER/V+T requires an external Schottky diode connected from LX to AGND-even though it integrates both high-side and low-side MOSFETs-because the internal low-side FET is only active in forced-PWM mode and cannot fully replace the diode's conduction path during skip mode or light-load transitions. The diode ensures continuous current path and improves efficiency across the full load range.
How does the FSYNC pin affect MAX16935CAUER/V+T operation in automotive systems?
The FSYNC pin directly selects between skip mode (FSYNC = AGND) for lowest quiescent current during vehicle sleep, and forced-PWM mode (FSYNC = BIAS or external clock) for constant-frequency operation essential in RF-sensitive domains like cellular modems or radar processors. This pin enables dynamic EMI/efficiency trade-off without firmware intervention.
What thermal derating applies to the MAX16935CAUER/V+T at 100°C ambient?
For the MAX16935CAUER/V+T in its 5mm × 5mm TQFN-EP package, junction-to-ambient thermal resistance is 35°C/W. At 100°C ambient, maximum allowable power dissipation drops to approximately 1.57W (calculated as (150°C − 100°C) ÷ 35°C/W), requiring careful layout and copper area to sustain 3.5A output under worst-case conditions.
Can the MAX16935CAUER/V+T be synchronized to an external clock outside the 1.8–2.6MHz range?
No-the MAX16935CAUER/V+T's FSYNC input is specified for external clock frequencies between 1.8MHz and 2.6MHz (±20% of internal 2.2MHz oscillator). Clocks outside this range may fail to synchronize reliably or cause undefined behavior; the datasheet explicitly states "Contact the factory for SYNC frequency outside the specified range."
MAX16935CAUER/V+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX16935CAUER/V+T FAQ
1.How can I place an order for MAX16935CAUER/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16935CAUER/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 MAX16935CAUER/V+T reliable?
The price and inventory of MAX16935CAUER/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 MAX16935CAUER/V+T is usually 5 days.
3.What payment methods are accepted for MAX16935CAUER/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16935CAUER/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16935CAUER/V+T?
MAX16935CAUER/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16935CAUER/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 MAX16935CAUER/V+T?
For technical support, including MAX16935CAUER/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16935CAUER/V+T requirements.
6.How does Aetrix verify that MAX16935CAUER/V+T is sourced from the original manufacturer or authorized distributors?
All MAX16935CAUER/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 MAX16935CAUER/V+T meets industry standards.
7.What is the process for return or replacement of MAX16935CAUER/V+T?
All MAX16935CAUER/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16935CAUER/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 MAX16935CAUER/V+T part is unused and in its original packaging.
Return procedure for MAX16935CAUER/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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