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Analog Devices Inc./Maxim Integrated MAX16935CAUES/V+T
- Part No.:
- MAX16935CAUES/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX16935CAUES/V+T.pdf
- Description:
- IC REG STP DWN 36V 3.5A 16TSSOP
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Product details
Overview
MAX16935CAUES/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 rails requiring 3.5V–36V input, 5V fixed output (±2% accuracy), 28µA no-load quiescent current, and operation up to 2.2MHz switching frequency. It supports forced-PWM (FPWM) and skip modes, features AEC-Q100 qualification, and targets point-of-load regulation in navigation head units.
For engineers reviewing the MAX16935CAUES/V+T datasheet, MAX16935CAUES/V+T pinout, MAX16935CAUES/V+T application, or MAX16935CAUES/V+T equivalent, key selection considerations include its 5V fixed output, 98% max duty cycle for cold-crank support, 180° out-of-phase SYNCOUT for cascaded supplies, and thermal shutdown with automatic recovery - all validated across –40°C to +125°C.
Technical Context
The MAX16935CAUES/V+T implements a current-mode control architecture with resistor-programmable oscillator (220kHz–2.2MHz) and dual-mode FSYNC logic enabling either skip mode (for light-load efficiency) or fixed-frequency FPWM (for EMI-sensitive RF transceiver supplies). Its internal 5V BIAS LDO powers control circuitry and enables direct connection of FB to BIAS for fixed 5V output.
It integrates a 100mΩ high-side MOSFET and 3Ω low-side MOSFET, operates with external Schottky diode for enhanced efficiency, and delivers 3.5A continuous output current. Protection includes cycle-by-cycle current limit, overvoltage protection (107% threshold), and thermal shutdown at +175°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±2% - eliminates need for external feedback resistors in standard 5V rail designs. |
| Input Voltage Range | 3.5V to 36V - supports automotive battery transients including cold crank (down to 3.5V) and load dump (up to 42V tolerant). |
| Quiescent Current | 28µA at no load - enables always-on functionality in vehicle infotainment systems without excessive battery drain. |
| Switching Frequency | Resistor-programmable 220kHz–2.2MHz - allows optimization of inductor size, EMI profile, and efficiency trade-offs. |
| Max Duty Cycle | 98% - maintains regulation during severe undervoltage events such as engine cranking. |
| Thermal Shutdown | +175°C with 15°C hysteresis - ensures robust operation under sustained high-power conditions in enclosed automotive enclosures. |
| Power-Good Output | Open-drain PGOOD with 95%/92% VFB thresholds - enables precise sequencing with microcontrollers and FPGA power domains. |
Pinout & Package
MAX16935CAUES/V+T is housed in a 16-pin, 5mm × 5mm TQFN-EP package with exposed pad for thermal dissipation. The EP must be connected to PGND via a large-area copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SYNCOUT | Open-drain clock output | Provides 180° out-of-phase signal relative to internal oscillator - enables synchronized cascading of multiple converters without external phase-shift circuitry. |
| 2 - FSYNC | Mode selection & sync input | Logic-controlled input: grounded → skip mode; tied to BIAS or external clock → FPWM mode - critical for EMI compliance in RF subsystems. |
| 3 - FOSC | Oscillator frequency setting | Connects to AGND via resistor (e.g., 12kΩ for 2.2MHz) - sets switching frequency and enables automatic slew-rate adjustment on LX. |
| 4 - OUT | Regulated output node | Delivers 5V/3.5A; also powers internal circuitry when output is 3V–5V - simplifies biasing in single-rail systems. |
| 5 - FB | Feedback reference input | Connected to BIAS for fixed 5V; used with resistor divider for adjustable 1V–10V outputs - precision 1.0V reference enables tight regulation. |
| 9 - BST | High-side gate driver supply | Requires 0.1µF capacitor between BST and LX - sustains gate drive voltage for high-side MOSFET during conduction. |
| 10 - EN | Enable input | 3.3V–42V compatible - allows direct connection to KL30 battery rail or CAN transceiver INH pin without level-shifting. |
| 11 - SUP | Main supply input | Powers internal LDO (BIAS); bypassed with 4.7µF ceramic capacitor - decouples logic supply from noisy input rails. |
| 12 - SUPSW | Switch supply input | Powers internal power switches; bypassed with 0.1µF + 4.7µF ceramics - isolates switch noise from analog control blocks. |
| 13/14 - LX | Switching node | Connects to Schottky diode cathode and inductor - high dv/dt node requiring careful layout; automatic slew-rate control minimizes EMI. |
| 15 - PGND | Power ground | Separate from AGND - provides low-impedance return path for high-current switch paths to reduce ground bounce. |
| 16 - PGOOD | Power-good monitor | Open-drain active-low output - signals valid regulation to system controller; requires pull-up to BIAS (10kΩ typical). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.5A high-side and low-side MOSFETs | Eliminates external power switches and reduces BOM count by ≥4 components versus discrete buck controllers. |
| 180° out-of-phase SYNCOUT | Enables interleaved operation of two MAX16935CAUES/V+T devices to halve input/output ripple and increase total power capacity. |
| Automatic LX slew-rate control | Adjusts gate drive rise time (4ns at >1.1MHz, 8ns at <1.1MHz) - optimizes EMI vs. efficiency without manual compensation. |
| AEC-Q100 qualified (Grade -40°C to +125°C) | Validated for automotive under-hood and infotainment applications - meets stress testing requirements for vibration, temperature cycling, and humidity. |
| Spread-spectrum modulation (factory-enabled) | ±6% frequency dither centered on fOSC - reduces peak EMI emissions by up to 10dB without affecting regulation or transient response. |
Applications
| Navigation Head Units | Automotive ADAS Camera Power |
|---|---|
Use Scenario: Powering display controllers, touch processors, and audio codecs in center-stack infotainment systems with variable battery voltage and strict EMI limits. IC Role / Device Role / Timing Role: Primary 5V point-of-load regulator delivering stable 3.5A output with FPWM mode enabled via FSYNC to suppress switching noise near RF receivers. Use Value: 28µA quiescent current extends battery life in accessory-off state; 98% duty cycle maintains display backlight operation during engine cranking. |
Use Scenario: Supplying image sensor and ISP in rear-view or surround-view cameras mounted in exterior housings subject to wide temperature swings. IC Role / Device Role / Timing Role: High-reliability 5V buck converter operating across –40°C to +125°C ambient, leveraging thermal shutdown with auto-recovery for fault resilience. Use Value: AEC-Q100 qualification and 42V input tolerance ensure uninterrupted operation during load-dump events; PGOOD enables safe sensor initialization sequence. |
| Distributed Automotive ECUs | Industrial Telematics Gateways |
Use Scenario: Providing regulated 5V to microcontroller, CAN transceiver, and LIN interface in body control modules with space-constrained PCB layouts. IC Role / Device Role / Timing Role: Compact TQFN-EP buck converter supporting cascaded power trees via SYNCOUT - synchronizes with adjacent rails to minimize conducted EMI. Use Value: 5mm × 5mm footprint saves >30% board area versus comparable TSSOP solutions; integrated MOSFETs reduce thermal design complexity. |
Use Scenario: Powering LTE/Wi-Fi modules, GPS receivers, and secure MCU in fleet management telematics units deployed in commercial vehicles. IC Role / Device Role / Timing Role: Input-tolerant buck regulator handling 12V/24V truck battery variations while maintaining clean 5V for sensitive RF front-ends. Use Value: External clock synchronization (FSYNC) allows alignment with baseband processor clocks - prevents beat-frequency interference in cellular bands. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16939CAUES/V+T | Lower OVP threshold (105% vs. 107%), tighter overvoltage protection; otherwise identical pinout, specs, and package. | Better suited for systems requiring stricter output voltage clamping, e.g., powering legacy 5V logic with narrow tolerance margins. | Select MAX16939CAUES/V+T only if tighter OVP is required; MAX16935CAUES/V+T remains optimal for general-purpose 5V automotive rails. |
| LM61480QRNXTQ1 | 4.5A rating, 3.5V–36V input, 5V fixed option, but uses external MOSFETs; no integrated low-side switch or SYNCOUT phase-shift capability. | Lacks 180° SYNCOUT and integrated low-side FET - cannot support cascaded interleaving or FPWM-only operation without external circuitry. | Choose LM61480QRNXTQ1 only when higher current (>3.5A) or different packaging (3mm × 3mm QFN) is prioritized over integrated features and EMI control. |
Compared with MAX16939CAUES/V+T, the MAX16935CAUES/V+T offers higher OVP threshold for relaxed margin applications; compared with LM61480QRNXTQ1, it delivers superior integration (dual MOSFETs, SYNCOUT, FPWM mode) in exchange for slightly lower current rating - making it ideal for space- and EMI-constrained automotive POE designs.
Availability
MAX16935CAUES/V+T is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial telematics gateways requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for MAX16935CAUES/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 MAX16935CAUES/V+T belongs to Maxim's automotive-grade power-management portfolio, designed specifically for demanding 12V/24V vehicle electrical systems requiring ultra-low IQ, wide VIN, and robust transient immunity.
FAQ
What is the fixed output voltage of the MAX16935CAUES/V+T?
The MAX16935CAUES/V+T provides a factory-trimmed fixed 5V output with ±2% accuracy over temperature and line. This is achieved by connecting the FB pin directly to the internal 5V BIAS rail, eliminating external feedback resistors and reducing component count in standard 5V applications.
Does the MAX16935CAUES/V+T support synchronization with an external clock?
Yes, the MAX16935CAUES/V+T supports external clock synchronization via the FSYNC pin. When driven with a clock signal within ±20% of the internal oscillator frequency (e.g., 1.8MHz–2.6MHz for a 2.2MHz setting), the device locks to the external source within one cycle and disables internal spread-spectrum modulation.
How does the MAX16935CAUES/V+T handle cold-crank conditions?
The MAX16935CAUES/V+T maintains regulation down to 3.5V input and supports up to 98% duty cycle, allowing continuous 5V output even during severe cold-crank events where battery voltage drops below nominal levels - a critical capability for automotive infotainment systems that must remain operational during engine start.
What is the purpose of the SYNCOUT pin on the MAX16935CAUES/V+T?
The SYNCOUT pin on the MAX16935CAUES/V+T provides an open-drain 180° out-of-phase clock signal relative to the internal oscillator. This enables precise interleaving of two or more MAX16935CAUES/V+T devices to reduce input/output ripple, improve thermal distribution, and increase total system power capacity without external timing components.
Is the MAX16935CAUES/V+T AEC-Q100 qualified?
Yes, the MAX16935CAUES/V+T is AEC-Q100 qualified for Grade 1 (–40°C to +125°C) operation. It has undergone full automotive reliability testing including temperature cycling, humidity bias HAST, and mechanical shock - confirming suitability for under-hood and infotainment applications in passenger and commercial vehicles.
MAX16935CAUES/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:
- -
MAX16935CAUES/V+T FAQ
1.How can I place an order for MAX16935CAUES/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16935CAUES/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 MAX16935CAUES/V+T reliable?
The price and inventory of MAX16935CAUES/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 MAX16935CAUES/V+T is usually 5 days.
3.What payment methods are accepted for MAX16935CAUES/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16935CAUES/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16935CAUES/V+T?
MAX16935CAUES/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16935CAUES/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 MAX16935CAUES/V+T?
For technical support, including MAX16935CAUES/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16935CAUES/V+T requirements.
6.How does Aetrix verify that MAX16935CAUES/V+T is sourced from the original manufacturer or authorized distributors?
All MAX16935CAUES/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 MAX16935CAUES/V+T meets industry standards.
7.What is the process for return or replacement of MAX16935CAUES/V+T?
All MAX16935CAUES/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16935CAUES/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 MAX16935CAUES/V+T part is unused and in its original packaging.
Return procedure for MAX16935CAUES/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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