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Analog Devices Inc./Maxim Integrated MAX16935RAUE/V+T
- Part No.:
- MAX16935RAUE/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16935RAUE/V+T.pdf
- Description:
- IC REG BUCK ADJ/1V 3.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,383
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Product details
Overview
MAX16935RAUE/V+T from Maxim Integrated is a 3.5A, current-mode synchronous step-down converter with integrated high-side and low-side MOSFETs, operating from 3.5V to 36V input and delivering fixed 5V output with ±2% accuracy. It features 28µA quiescent current, resistor-programmable switching frequency (220kHz–2.2MHz), and forced-PWM operation under light load-enabling stable power delivery in automotive infotainment systems during cold-crank transients.
For engineers reviewing the MAX16935RAUE/V+T datasheet, MAX16935RAUE/V+T pinout, MAX16935RAUE/V+T application, or MAX16935RAUE/V+T equivalent, key selection considerations include its AEC-Q100 qualification, 98% max duty cycle for undervoltage support, 180° out-of-phase SYNCOUT for cascaded supplies, and integrated BIAS LDO for self-powered biasing-critical for automotive power-tree design and RF-sensitive subsystems.
Technical Context
The MAX16935RAUE/V+T implements a current-mode control architecture with automatic LX slew-rate adjustment (4ns at >1.1MHz, 8ns otherwise) to optimize EMI/efficiency trade-offs. Its dual supply inputs (SUP and SUPSW) enable robust operation across wide VIN ranges, including 42V load-dump tolerance and cold-crank support down to 3.5V.
It supports three operating modes-skip mode (FSYNC = AGND), forced-PWM (FSYNC = BIAS or external clock), and external synchronization-with cycle-by-cycle current limiting, thermal shutdown at +175°C (15°C hysteresis), and overvoltage protection (107% of VOUT for MAX16935). The 180° phase-shifted SYNCOUT enables interleaved multi-phase designs without external timing ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V (42V tolerant); supports automotive battery transients including cold crank and load dump. |
| Output Current | 3.5A continuous; enables single-chip 5V/3.5A PoL conversion for navigation head units and ADAS modules. |
| Quiescent Current | 28µA at no load; meets ultra-low standby power requirements for always-on automotive ECUs. |
| Switching Frequency | 220kHz–2.2MHz (resistor-programmable); allows optimization of inductor size, efficiency, and EMI filtering. |
| Output Voltage Accuracy | ±2% over -40°C to +125°C; ensures reliable microcontroller and sensor rail regulation in harsh environments. |
| Duty Cycle Max | 98%; maintains regulation during severe undervoltage events (e.g., engine cranking at <6V). |
| Thermal Shutdown | +175°C with 15°C hysteresis; provides autonomous recovery after thermal overload without system intervention. |
Pinout & Package
MAX16935RAUE/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 | Delivers 180° out-of-phase signal relative to internal oscillator; enables synchronized cascaded buck stages without external timing ICs. |
| 2 – FSYNC | Mode-select logic input | Configures skip mode (AGND) or forced-PWM (BIAS/external clock); eliminates frequency variation for EMI-sensitive RF power supplies. |
| 3 – FOSC | Frequency-setting input | Resistor-to-AGND sets switching frequency; supports precise EMI band placement and layout-driven frequency optimization. |
| 4 – OUT | Regulated output node | Provides 5V fixed output; powers downstream circuitry and internally supplies bias when VOUT ≥3V. |
| 5 – FB | Feedback reference input | Connected to BIAS for 5V fixed output; accepts resistive divider for adjustable 1V–10V outputs with 1.0V reference. |
| 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 for noise immunity and startup reliability. |
| 8 – AGND | Analog ground reference | Separate ground for precision feedback and error amplifier; must be star-connected to avoid noise coupling. |
| 9 – BST | High-side gate driver supply | Requires 0.1µF capacitor between BST and LX; enables bootstrap operation of integrated high-side MOSFET. |
| 10 – EN | Enable input | 3.3V–42V logic-compatible; controls device startup/shutdown with 2.4V high threshold and 0.6V low threshold. |
| 11 – SUP | Main supply input | Powers internal LDO; bypassed with 4.7µF ceramic capacitor to PGND for low-noise analog supply. |
| 12 – SUPSW | Switch supply input | Powers internal power switches; bypassed with 0.1µF + 4.7µF ceramics to PGND for high di/dt current return. |
| 13–14 – LX | Switching node | Connects to Schottky diode cathode and inductor; high dv/dt node requiring tight layout and minimized parasitic inductance. |
| 15 – PGND | Power ground | Primary return path for high-current switch paths; must be low-impedance and thermally coupled to EP. |
| 16 – PGOOD | Open-drain power-good | Asserts high when VOUT ≥95% of regulation; enables safe sequencing of downstream processors and memory. |
| EP – Exposed Pad | Thermal & electrical ground | Must be soldered to large copper pour tied to PGND; critical for thermal dissipation (35°C/W J-A) and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.5A high- and low-side MOSFETs | Eliminates external power switches and reduces BOM count by 4–6 components versus discrete controller solutions. |
| 180° out-of-phase SYNCOUT | Enables two-stage interleaved buck conversion with 50% ripple current cancellation and reduced input/output capacitor sizing. |
| Automatic LX slew-rate control | Adjusts gate drive rise time (4ns/8ns) based on selected fSW to minimize EMI without sacrificing efficiency. |
| AEC-Q100 qualified (-40°C to +125°C) | Validated for automotive under-hood applications including engine control, body electronics, and infotainment. |
| Spread-spectrum modulation (factory-enabled S-version) | Reduces peak EMI by ±6% frequency dithering; improves CISPR 25 Class 5 compliance margin. |
| Power-good (PGOOD) with 3% hysteresis | Provides clean, glitch-free sequencing signal for microcontrollers and FPGAs; supports fault-safe power-up/down sequences. |
Applications
| Navigation Head Units | ADAS Camera Power Supplies |
|---|---|
Use Scenario: Powering display controllers, touch processors, and GPS modules in automotive center-stack displays during cold-crank and load-dump events. IC Role / Device Role / Timing Role: Primary 5V PoL regulator with 98% duty cycle capability and 28µA quiescent current for always-on functionality. Use Value: Maintains display operation below 6V input during engine cranking while minimizing battery drain in sleep mode. |
Use Scenario: Supplying image sensors and ISP processors in forward-facing cameras where EMI must not interfere with radar or V2X signals. IC Role / Device Role / Timing Role: Fixed-frequency forced-PWM (FPWM) regulator synchronized via FSYNC to eliminate variable-frequency noise. Use Value: Enables CISPR 25-compliant power delivery without additional EMI filters, reducing bill-of-materials cost. |
| Body Control Modules (BCM) | Telematics Control Units (TCU) |
Use Scenario: Providing regulated 5V rail for CAN transceivers, LIN interfaces, and door-lock actuators in distributed vehicle networks. IC Role / Device Role / Timing Role: Automotive-grade buck converter with AEC-Q100 qualification and 42V transient tolerance. Use Value: Survives 42V load-dump pulses without latch-up or degradation, eliminating need for external TVS clamping. |
Use Scenario: Generating stable 5V supply for cellular modems, GNSS receivers, and secure boot processors in connected vehicle gateways. IC Role / Device Role / Timing Role: Dual-supply (SUP/SUPSW) buck with integrated BIAS LDO and PGOOD for sequenced power-up of security-critical subsystems. Use Value: Ensures deterministic boot sequence and prevents firmware corruption during brown-out conditions. |
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, 12µA IQ, but lacks integrated BIAS LDO and 180° SYNCOUT. | Requires external bias supply and separate timing IC for cascaded operation; better suited for non-automotive industrial use. | Select LM61480RQR only if higher current headroom and lower IQ outweigh loss of integrated bias and sync features. |
| TPS54560QDGQRQ1 | AEC-Q100 qualified, 3.5V–60V input, 5A, but uses external MOSFETs and has 110µA IQ-no FPWM light-load mode. | Needs external high-side/low-side FETs and gate drivers; less compact, higher layout complexity, and higher standby power. | Choose TPS54560QDGQRQ1 only when input exceeds 36V or when discrete FET selection is required for thermal or reliability reasons. |
Compared with LM61480RQR and TPS54560QDGQRQ1, MAX16935RAUE/V+T uniquely integrates bias regulation, 180° synchronization, and forced-PWM light-load operation-reducing component count and improving EMI control in space-constrained automotive modules without compromising transient performance.
Availability
MAX16935RAUE/V+T is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera power, body control modules, and telematics applications requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for MAX16935RAUE/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 reliability, integration, and power efficiency.
The MAX16935 product line targets automotive power management, delivering high-current, wide-input DC-DC conversion with AEC-Q100 qualification, transient robustness, and feature integration for simplified ECU and ADAS subsystem design.
FAQ
What is the maximum duty cycle supported by the MAX16935RAUE/V+T, and why is it important?
The MAX16935RAUE/V+T supports up to 98% maximum duty cycle, enabling regulation during severe undervoltage transients such as automotive cold-crank events where input voltage drops below 6V. This ensures uninterrupted operation of critical loads like display controllers and microcontrollers without brown-out resets. The high duty cycle is achieved through optimized gate drive and low dropout design, making MAX16935RAUE/V+T especially valuable in under-hood and battery-supplied automotive systems.
How does the FSYNC pin configure operating modes on the MAX16935RAUE/V+T?
The FSYNC pin on MAX16935RAUE/V+T selects between skip mode (FSYNC = AGND) for highest light-load efficiency and forced-PWM (FPWM) mode (FSYNC = BIAS or external clock) for constant-frequency operation. In FPWM mode, the integrated low-side MOSFET remains active to maintain fixed switching frequency-critical for minimizing EMI in RF-sensitive applications like cellular modems or radar receivers powered by MAX16935RAUE/V+T.
Does the MAX16935RAUE/V+T require an external Schottky diode, and if so, why?
Yes, the MAX16935RAUE/V+T requires an external Schottky diode connected from LX to AGND-even though it integrates both high-side and low-side MOSFETs. This diode supports continuous conduction mode (CCM) operation and improves efficiency at light loads and high frequencies by reducing reverse-recovery losses. The datasheet specifies this requirement explicitly to ensure optimal thermal performance and transient response across the full 3.5A load range.
What is the function of the SYNCOUT pin on the MAX16935RAUE/V+T, and how is it used?
The SYNCOUT pin on MAX16935RAUE/V+T provides an open-drain, 180° out-of-phase clock signal relative to the internal oscillator. It is used to synchronize a second MAX16935RAUE/V+T (or compatible buck) in interleaved configuration-halving input/output ripple current and reducing required capacitance. A pull-up resistor (100Ω–1kΩ) to OUT enables 2MHz operation; for lower frequencies, 1kΩ–10kΩ is recommended per the datasheet.
Is the MAX16935RAUE/V+T AEC-Q100 qualified, and what temperature range does it support?
Yes, the MAX16935RAUE/V+T is AEC-Q100 qualified and operates across the full automotive temperature range of -40°C to +125°C. Its junction temperature limit is +150°C, with thermal shutdown activating at +175°C (typical) and recovering after 15°C hysteresis. This qualification ensures reliability in demanding under-hood and dashboard-mounted applications where MAX16935RAUE/V+T delivers regulated 5V power to safety-critical and infotainment subsystems.
MAX16935RAUE/V+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) 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-TSSOP-EP
MAX16935RAUE/V+T FAQ
1.How can I place an order for MAX16935RAUE/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16935RAUE/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 MAX16935RAUE/V+T reliable?
The price and inventory of MAX16935RAUE/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 MAX16935RAUE/V+T is usually 5 days.
3.What payment methods are accepted for MAX16935RAUE/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16935RAUE/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16935RAUE/V+T?
MAX16935RAUE/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16935RAUE/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 MAX16935RAUE/V+T?
For technical support, including MAX16935RAUE/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16935RAUE/V+T requirements.
6.How does Aetrix verify that MAX16935RAUE/V+T is sourced from the original manufacturer or authorized distributors?
All MAX16935RAUE/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 MAX16935RAUE/V+T meets industry standards.
7.What is the process for return or replacement of MAX16935RAUE/V+T?
All MAX16935RAUE/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16935RAUE/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 MAX16935RAUE/V+T part is unused and in its original packaging.
Return procedure for MAX16935RAUE/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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