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Analog Devices Inc./Maxim Integrated MAX16935SATE/V+
- Part No.:
- MAX16935SATE/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16935SATE/V+.pdf
- Description:
- IC REG BUCK ADJ/1V 3.5A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:435
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Product details
Overview
MAX16935SATE/V+ from Maxim Integrated is a 3.5A, current-mode synchronous step-down 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 2.2MHz switching frequency - deployed in navigation head units and RF-sensitive infotainment systems.
For engineers reviewing the MAX16935SATE/V+ datasheet, MAX16935SATE/V+ pinout, MAX16935SATE/V+ application, or MAX16935SATE/V+ equivalent, key selection criteria include AEC-Q100 qualification, 98% max duty cycle for cold-crank support, FPWM/skip mode control via FSYNC, 180° out-of-phase SYNCOUT for cascaded supplies, and thermal shutdown with automatic recovery.
Technical Context
The MAX16935SATE/V+ implements a current-mode control architecture with resistor-programmable oscillator (220kHz–2.2MHz) and automatic LX slew-rate adjustment (4ns at >1.1MHz) to balance EMI and efficiency. Its dual supply inputs (SUP/SUPSW) enable robust operation during automotive transients including load dump (42V tolerant) and cold crank.
It integrates a 5V BIAS LDO, open-drain PGOOD with 95%/92% regulation thresholds, and overvoltage protection (107% of VFB for MAX16935). The FSYNC pin selects between skip mode (FSYNC = AGND) and forced-PWM mode (FSYNC = BIAS or external clock), enabling EMI-optimized light-load behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports full automotive battery range including cold crank (≥3.5V) and load dump (42V tolerant) |
| Output Current | 3.5A continuous - enables single-chip 5V/3.5A PoL conversion without external pass devices |
| Quiescent Current | 28µA at no load - meets ultra-low standby power requirements for always-on automotive modules |
| Switching Frequency | 2.2MHz (typ, RFOSC = 12kΩ) - allows compact 2.2µH inductors and reduces EMI fundamental below AM band |
| Output Voltage Accuracy | ±2% for 5V fixed output - ensures reliable logic rail compliance across -40°C to +125°C |
| Max Duty Cycle | 98% - sustains regulation during undervoltage transients (e.g., engine cranking down to ~4V) |
| Thermal Protection | 175°C shutdown with 15°C hysteresis - prevents permanent damage under sustained overload or poor heatsinking |
Pinout & Package
MAX16935SATE/V+ is housed in a 16-pin, 5mm × 5mm TQFN-EP package with exposed pad connected to PGND for thermal management. Pin functions are validated per Maxim's official datasheet Rev 17 (1/18).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SYNCOUT | Open-drain clock output | 180° out-of-phase signal relative to internal oscillator - enables phase interleaving with second MAX16935 for higher-current cascaded supplies |
| 2 - FSYNC | Mode control & sync input | Selects skip mode (AGND) or FPWM (BIAS/external clock); synchronizes to external clock within ±20% frequency range |
| 3 - FOSC | Oscillator frequency setting | Resistor-to-AGND sets fSW from 220kHz to 2.2MHz - determines inductor size, ripple, and EMI profile |
| 4 - OUT | Power output node | Delivers regulated 5V (fixed) or adjustable 1V–10V output - also powers internal circuitry when VOUT ≥ 3V |
| 5 - FB | Feedback input | Monitors output via resistive divider; 1.0V reference enables precise VOUT programming (e.g., 5V = R1/R2 = 4:1) |
| 9 - BST | High-side gate driver supply | 0.1µF bootstrap capacitor between BST and LX enables efficient high-side MOSFET drive above input rail |
| 10 - EN | Enable input | 3.3V–42V compatible logic-level enable - directly driven from KL30, CAN transceiver INH, or microcontroller GPIO |
| 11 - SUP | Main supply input | Powers internal bias regulator; bypassed with 4.7µF ceramic capacitor - decouples logic supply from noisy power rail |
| 12 - SUPSW | Switch supply input | Powers internal high-side/low-side MOSFET drivers; bypassed with 0.1µF + 4.7µF ceramics - isolates switch noise from analog blocks |
| 13/14 - LX | Switching node | Connects to Schottky diode cathode and inductor - high dv/dt node requiring tight layout and external RC filter if pulse skipping occurs |
| 15 - PGND | Power ground | Low-impedance return path for high-current LX and output paths - separate from AGND to minimize noise coupling |
| 16 - PGOOD | Power-good monitor | Open-drain active-low flag asserting at 95% VOUT and deasserting at 92% VOUT - enables safe power sequencing with MCUs/FPGAs |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.5A high-side + low-side MOSFETs | Eliminates external power switches and associated gate-drive complexity while maintaining 98% duty cycle capability |
| 180° out-of-phase SYNCOUT | Enables two-stage interleaved buck design - cuts input/output ripple current by ~50% and reduces required capacitance |
| Automatic LX slew-rate control | Adjusts HSFET turn-on time to 4ns (2.2MHz) or 8ns (400kHz) - optimizes EMI vs. efficiency trade-off without manual tuning |
| AEC-Q100 qualified (-40°C to +125°C) | Validated for automotive under-hood and infotainment applications - includes HTOL, temperature cycling, and ESD testing |
| Spread-spectrum modulation (factory-enabled in S-version) | ±6% triangular dither centered on fOSC - reduces peak EMI amplitude without altering average switching frequency |
Applications
| Navigation Head Units | RF Transceiver Power Supplies |
|---|---|
Use Scenario: Powering display controllers, touch processors, and GPS baseband ICs in automotive center-stack displays. IC Role / Device Role / Timing Role: Primary 5V PoL regulator delivering stable, low-noise power with cold-crank hold-up and sequenced startup. Use Value: 98% max duty cycle maintains 5V output during engine cranking (down to 4.5V input); PGOOD enables safe MCU reset sequencing. |
Use Scenario: Supplying voltage-controlled oscillators (VCOs), mixers, and ADCs in cellular/V2X radio front-ends. IC Role / Device Role / Timing Role: Low-EMI, fixed-frequency FPWM regulator synchronized to system clock to avoid heterodyne interference. Use Value: Forced-PWM mode eliminates frequency variation; spread-spectrum option (S-version) further suppresses narrowband emissions. |
| Distributed Automotive DC Systems | Industrial Control Modules |
Use Scenario: Providing isolated 5V rails to multiple ECUs (e.g., body control, HVAC, ADAS sensors) from a shared 12V bus. IC Role / Device Role / Timing Role: Cascaded buck converter using SYNCOUT-to-FSYNC interconnection for phase-shifted operation. Use Value: 180° SYNCOUT enables two-phase interleaving - reduces input capacitor RMS current and eases EMI filtering. |
Use Scenario: Powering ARM Cortex-M7 microcontrollers, Ethernet PHYs, and isolated I/O in factory automation gateways. IC Role / Device Role / Timing Role: Robust primary DC-DC stage supporting wide-input industrial power (9–36V DC) with high-temp reliability. Use Value: -40°C to +125°C operation and 42V transient tolerance ensure uptime in uncontrolled ambient 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 |
|---|---|---|---|
| MAX16939SAUE/V+ | Lower OVP threshold (105% vs. 107% of VFB); identical pinout, specs, and package | Better suited for systems requiring tighter output overvoltage clamping (e.g., FPGA core rails) | Select MAX16939SAUE/V+ only if tighter OVP is mandatory; otherwise MAX16935SATE/V+ offers broader margin |
| LM61480QRNXTQ1 | 4.5A rating, 3.5V–36V input, 2.1MHz max fSW, 15µA IQ, but no SYNCOUT or BIAS LDO | Lacks 180° cascading capability and integrated 5V bias rail - requires external LDO for auxiliary circuitry | Choose LM61480QRNXTQ1 for higher current or lower IQ; retain MAX16935SATE/V+ when SYNCOUT, BIAS, or AEC-Q100 cascade support is needed |
Compared with MAX16939SAUE/V+, MAX16935SATE/V+ provides higher overvoltage protection margin; compared with LM61480QRNXTQ1, it delivers integrated BIAS regulation and phase-interleaving capability essential for multi-rail automotive designs.
Availability
MAX16935SATE/V+ is available at Aetrix Electronics and suitable for automotive infotainment, ADAS domain controllers, and industrial gateway applications requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for MAX16935SATE/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 - emphasizing high-reliability, low-power, and AEC-Q100-compliant solutions.
The MAX16935/MAX16939 product line targets automotive power conversion with emphasis on cold-crank resilience, EMI control, and seamless integration into multi-rail systems - specifically engineered for navigation, radio, and telematics modules.
FAQ
What is the maximum input voltage the MAX16935SATE/V+ can withstand during load dump events?
The MAX16935SATE/V+ supports up to 42V input during load dump transients (VSUP_LD ≤ 42V, tLD < 1s), as specified in its Absolute Maximum Ratings. This rating applies to both SUP and SUPSW pins and is validated per ISO 7637-2 Pulse 5a. The device remains functional and undamaged under these conditions, making it suitable for direct connection to automotive battery rails without external TVS clamping in many implementations.
Does the MAX16935SATE/V+ require an external Schottky diode, and why?
Yes, the MAX16935SATE/V+ requires an external Schottky diode connected from LX to AGND. Although it integrates high-side and low-side MOSFETs, the low-side MOSFET is used only for synchronous rectification in FPWM mode - the external diode provides conduction path during skip mode and ensures robust operation across full load range, especially under light loads or transient conditions where MOSFET body diode conduction would increase losses.
How does the FSYNC pin control operating mode in the MAX16935SATE/V+?
The FSYNC pin selects between skip mode and forced-PWM (FPWM) mode: connecting FSYNC to AGND enables skip mode for highest light-load efficiency, while connecting it to BIAS or an external clock forces FPWM operation across all loads. In FPWM mode, the internal low-side MOSFET actively conducts, eliminating frequency variation and minimizing EMI - critical for RF-sensitive applications like cellular modems or V2X transceivers.
What is the purpose of the SYNCOUT pin on the MAX16935SATE/V+, and how is it used?
The SYNCOUT pin on the MAX16935SATE/V+ outputs an open-drain 180° out-of-phase clock signal relative to the internal oscillator. It is used to synchronize a second MAX16935SATE/V+ (or compatible device) in a cascaded configuration - enabling interleaved operation that halves input/output ripple current and reduces required bulk capacitance. A pull-up resistor (100Ω–1kΩ) to OUT sets proper logic levels for 2MHz operation.
Is the MAX16935SATE/V+ pin-compatible with other variants in the MAX16935/MAX16939 family?
Yes, the MAX16935SATE/V+ is pin-compatible with all members of the MAX16935/MAX16939 family, including MAX16935C, MAX16939, and MAX16939C, in both TQFN-EP and TSSOP-EP packages. Differences lie in internal features (e.g., OVP threshold, spread-spectrum enable) and output voltage options (3.3V/5V fixed or adjustable), not pin assignment or electrical interface - allowing drop-in replacement where functional requirements align.
MAX16935SATE/V+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tray
- 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)
MAX16935SATE/V+ FAQ
1.How can I place an order for MAX16935SATE/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16935SATE/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 MAX16935SATE/V+ reliable?
The price and inventory of MAX16935SATE/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16935SATE/V+ is usually 5 days.
3.What payment methods are accepted for MAX16935SATE/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16935SATE/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16935SATE/V+?
MAX16935SATE/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16935SATE/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 MAX16935SATE/V+?
For technical support, including MAX16935SATE/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16935SATE/V+ requirements.
6.How does Aetrix verify that MAX16935SATE/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16935SATE/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 MAX16935SATE/V+ meets industry standards.
7.What is the process for return or replacement of MAX16935SATE/V+?
All MAX16935SATE/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16935SATE/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 MAX16935SATE/V+ part is unused and in its original packaging.
Return procedure for MAX16935SATE/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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