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Analog Devices Inc./Maxim Integrated MAX16935SAUE/V+
- Part No.:
- MAX16935SAUE/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16935SAUE/V+.pdf
- Description:
- IC REG BUCK ADJ/1V 3.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,339
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Product details
Overview
MAX16935SAUE/V+ 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 MAX16935SAUE/V+ datasheet, MAX16935SAUE/V+ pinout, MAX16935SAUE/V+ application, or MAX16935SAUE/V+ equivalent, key selection considerations include its AEC-Q100 qualification, 98% max duty cycle for cold-crank support, 180° out-of-phase SYNCOUT for cascaded supplies, and FPWM/skip mode control via FSYNC pin for EMI-sensitive RF transceiver power rails.
Technical Context
The MAX16935SAUE/V+ implements a current-mode control architecture with internal slope compensation, enabling stable operation across wide input/output ratios and load transients. Its dual-supply inputs (SUP and SUPSW) decouple logic and power-switch domains, supporting undervoltage operation down to 3.5V while maintaining regulation during automotive cold-crank events.
It integrates a 5V BIAS linear regulator, automatic LX slew-rate adjustment (4ns/8ns based on fSW), and cycle-by-cycle current limiting with 4.2A–6.2A peak inductor current threshold. The device supports three frequency modes-skip, forced-PWM, and external synchronization-and includes spread-spectrum modulation (±6%) when factory-enabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V (42V transient tolerant); enables direct connection to automotive battery rail without pre-regulation. |
| Output Current | 3.5A continuous RMS; supports high-power SoC and display backlight loads in head units. |
| Quiescent Current | 28µA at no load; meets ISO 16750-2 standby current requirements for always-on ECUs. |
| Switching Frequency | 220kHz to 2.2MHz (resistor-programmable); allows compact magnetics and noise filtering above AM band. |
| Output Voltage Accuracy | ±2% over -40°C to +125°C; ensures reliable power delivery to sensitive analog and RF circuitry. |
| Duty Cycle Max | 98%; sustains regulated 5V output during 6V cold-crank transients without dropout. |
| Thermal Protection | 175°C shutdown with 15°C hysteresis; prevents thermal runaway in enclosed automotive enclosures. |
Pinout & Package
MAX16935SAUE/V+ 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 copper pour; it is not a functional ground terminal but a thermal path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – SYNCOUT | Open-drain clock output | Provides 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 | Logic-selectable: AGND = skip mode; BIAS or external clock = forced-PWM; critical for EMI control in RF power rails. |
| 3 – FOSC | Frequency programming node | Resistor-to-AGND sets fSW; 12kΩ yields 2.2MHz-optimizes size vs. efficiency trade-off for compact layouts. |
| 4 – OUT | Regulated output node | Delivers 5V (fixed) or adjustable 1V–10V; powers downstream logic, sensors, and analog subsystems directly. |
| 5 – FB | Feedback reference input | Connected to BIAS for 5V fixed output; used with resistive divider for adjustable outputs-enables flexible BOM reuse. |
| 6 – COMP | Error amplifier output | Connects to RC compensation network; stabilizes loop response across temperature and load variations. |
| 7 – BIAS | Integrated 5V LDO output | Powers internal circuitry; bypassed with 1µF ceramic capacitor-reduces need for external bias supply. |
| 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 bootstrap capacitor between BST and LX; enables efficient high-side MOSFET drive. |
| 10 – EN | Enable input | 3.3V–42V compatible; allows direct connection to KL30 or CAN transceiver INH pin for system-level sequencing. |
| 11 – SUP | Logic supply input | Powers internal LDO and logic; bypassed with 4.7µF ceramic capacitor-filters noise from battery rail. |
| 12 – SUPSW | Switch supply input | Powers high-side MOSFET driver; bypassed with 0.1µF + 4.7µF ceramics-ensures clean gate drive under load transients. |
| 13–14 – LX | Switching node | Connects to Schottky diode cathode and inductor; high dv/dt node requiring tight layout and guard ring. |
| 15 – PGND | Power ground return | Primary return path for high-current switch and output capacitor; must be low-inductance connection to EP. |
| 16 – PGOOD | Open-drain power-good flag | Asserts high when VOUT ≥ 95% of regulation; enables safe sequencing of downstream processors and FPGAs. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.5A high-side + low-side MOSFETs | Eliminates external power switches and reduces BOM count by 4–6 components versus discrete controllers. |
| 180° out-of-phase SYNCOUT | Enables two-phase interleaved operation with second MAX16935, cutting input/output ripple current by ~70%. |
| Automatic LX slew-rate control | Adjusts gate drive rise time (4ns @ >1.1MHz, 8ns @ <1.1MHz) to minimize EMI without sacrificing efficiency. |
| AEC-Q100 qualified (Grade -40°C to +125°C) | Validated for under-hood automotive use; eliminates need for additional qualification testing in Tier-1 designs. |
| Power-good (PGOOD) with 3% hysteresis | Provides precise enable/disable signaling for microcontroller reset and FPGA configuration sequencing. |
| Spread-spectrum modulation (factory option) | Reduces peak EMI amplitude by ±6% frequency dithering-helps pass CISPR 25 Class 5 radiated emissions. |
Applications
| Automotive Infotainment Head Unit | ADAS Camera Power Supply |
|---|---|
|
Use Scenario: Powers main SoC, display interface, and audio codec in 12V vehicle head units with start-stop capability. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering 3.5A with cold-crank support and low-noise FPWM mode during Bluetooth/WiFi transmission. Use Value: 28µA quiescent current enables always-on voice wake-up; 98% duty cycle maintains regulation during 6V cranking pulses. |
Use Scenario: Supplies image sensor and ISP in forward-facing camera modules mounted behind windshield. IC Role / Device Role / Timing Role: Fixed 5V supply with PGOOD sequencing and SYNCOUT phase alignment for multi-camera synchronization. Use Value: AEC-Q100 qualification ensures reliability at +105°C ambient; spread-spectrum option suppresses EMI near CMOS sensor analog front-end. |
| Industrial Telematics Gateway | Commercial Vehicle Display Controller |
|
Use Scenario: Powers LTE modem, GNSS receiver, and secure MCU in fleet management telematics units. IC Role / Device Role / Timing Role: High-efficiency buck converter with skip mode for low-power sleep states and FPWM for burst data transmission. Use Value: Dual SUP/SUPSW inputs isolate logic and power domains-prevents noise coupling from modem RF bursts into GNSS LNA supply. |
Use Scenario: Delivers 5V to TFT-LCD timing controller and touch controller in heavy-duty truck dash displays. IC Role / Device Role / Timing Role: Robust 36V-input buck with thermal shutdown and overvoltage protection for harsh vibration/temperature environments. Use Value: 42V transient tolerance eliminates need for external TVS; PGOOD output coordinates display initialization with MCU boot sequence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQR | 4.5A rated, 3.5V–36V input, 2.1MHz max fSW, no integrated low-side MOSFET; requires external diode or synchronous rectifier. | Lacks 180° SYNCOUT and BIAS LDO; requires external bias supply and more complex compensation. | Choose LM61480RQR if higher output current (4.5A) is required and board space permits external FET + diode. |
| TPS62933RTER | 3A rated, 3V–36V input, 1.8MHz max fSW, integrated FETs, 15µA IQ, but only -40°C to +105°C temp range. | Not AEC-Q100 qualified; lacks cold-crank support (no 98% duty cycle) and SYNCOUT phase control. | Choose TPS62933RTER for non-automotive industrial applications where ultra-low IQ and smaller footprint outweigh automotive compliance needs. |
Compared with LM61480RQR and TPS62933RTER, MAX16935SAUE/V+ uniquely combines AEC-Q100 qualification, 98% duty cycle, integrated BIAS LDO, and 180° SYNCOUT-making it the only choice for phase-interleaved, cold-crank-capable automotive power rails requiring minimal external components.
Availability
MAX16935SAUE/V+ is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial telematics requiring stable component supply across extended temperature and voltage transients.
Supply support for MAX16935SAUE/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 demanding industrial, automotive, and communications applications.
The MAX16935 product line targets automotive power conversion with AEC-Q100 qualification, cold-crank resilience, and EMI-optimized features-specifically engineered for infotainment, ADAS, and body electronics.
FAQ
What is the maximum input voltage transient tolerance for MAX16935SAUE/V+?
MAX16935SAUE/V+ withstands 42V transients for ≤1 second per ISO 16750-2 Load Dump Pulse 5a, with absolute maximum ratings specifying SUP/SUPSW pins at -0.3V to +42V. This eliminates need for external TVS diodes in most 12V automotive systems, reducing BOM cost and board area while ensuring robustness against alternator load dump events.
Does MAX16935SAUE/V+ support fixed 5V output without external resistors?
Yes, MAX16935SAUE/V+ supports fixed 5V output by connecting the FB pin directly to the BIAS pin-no external resistor divider required. This configuration delivers ±2% output accuracy over -40°C to +125°C and simplifies design for standard 5V rail applications such as USB peripherals and digital logic in automotive modules.
How does the FSYNC pin control operating mode in MAX16935SAUE/V+?
The FSYNC pin selects between skip mode and forced-PWM (FPWM) mode: connecting FSYNC to AGND enables skip mode for light-load efficiency, while connecting to BIAS or an external clock forces FPWM for constant-frequency operation. This dual-mode capability allows designers to optimize EMI performance in RF-sensitive applications like cellular modems without sacrificing efficiency during idle states.
What thermal management provisions exist for MAX16935SAUE/V+ in high-ambient environments?
MAX16935SAUE/V+ includes thermal shutdown at +175°C (typ) with 15°C hysteresis and a 5mm × 5mm TQFN-EP package featuring low junction-to-ambient thermal resistance (35°C/W). The exposed pad must be soldered to a large PGND copper pour; this combination enables reliable operation at +125°C ambient in sealed enclosures typical of under-dash automotive locations.
Can MAX16935SAUE/V+ be synchronized to an external clock source?
Yes, MAX16935SAUE/V+ accepts external clock signals on the FSYNC pin within ±20% of its internal oscillator frequency (e.g., 1.76MHz–2.64MHz for 2.2MHz nominal). Synchronization occurs within one cycle, and the device reverts to internal oscillation if the external clock is absent for >2 cycles-enabling precise timing alignment across multiple power rails in multi-processor automotive systems.
MAX16935SAUE/V+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) 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 (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-TSSOP-EP
MAX16935SAUE/V+ FAQ
1.How can I place an order for MAX16935SAUE/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16935SAUE/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 MAX16935SAUE/V+ reliable?
The price and inventory of MAX16935SAUE/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16935SAUE/V+ is usually 5 days.
3.What payment methods are accepted for MAX16935SAUE/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16935SAUE/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16935SAUE/V+?
MAX16935SAUE/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16935SAUE/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 MAX16935SAUE/V+?
For technical support, including MAX16935SAUE/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16935SAUE/V+ requirements.
6.How does Aetrix verify that MAX16935SAUE/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16935SAUE/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 MAX16935SAUE/V+ meets industry standards.
7.What is the process for return or replacement of MAX16935SAUE/V+?
All MAX16935SAUE/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16935SAUE/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 MAX16935SAUE/V+ part is unused and in its original packaging.
Return procedure for MAX16935SAUE/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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