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Analog Devices Inc./Maxim Integrated MAX16935RATEB/V+T
- Part No.:
- MAX16935RATEB/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16935RATEB/V+T.pdf
- Description:
- IC REG BUCK ADJ/1V 3.5A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,285
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Product details
Overview
MAX16935RATEB/V+T from Maxim Integrated is a 3.5A, 36V input current-mode synchronous step-down converter with integrated high-side and low-side MOSFETs, 28µA no-load quiescent current, resistor-programmable switching frequency (220kHz–2.2MHz), and fixed 5V output. It operates across -40°C to +125°C and supports automotive cold-crank and load-dump conditions (42V tolerant), making it suitable for navigation head units and RF-sensitive power rails.
For engineers reviewing the MAX16935RATEB/V+T datasheet, MAX16935RATEB/V+T pinout, MAX16935RATEB/V+T application, or MAX16935RATEB/V+T equivalent, key selection criteria include its FPWM/skip mode control via FSYNC, 180° out-of-phase SYNCOUT for cascaded supplies, ±2% output accuracy, AEC-Q100 qualification, and thermal shutdown with automatic recovery.
Technical Context
The MAX16935RATEB/V+T implements current-mode control with cycle-by-cycle current limiting and automatic LX slew-rate adjustment-4ns rise time at >1.1MHz, 8ns below-to optimize EMI while maintaining efficiency. Its dual supply inputs (SUP and SUPSW) enable operation down to 3.5V input with 98% duty cycle during undervoltage transients.
It integrates a 5V BIAS linear regulator (±1% over temperature), open-drain PGOOD with 95%/92% VFB thresholds, and overvoltage protection (107% of regulated output). The device supports external clock synchronization (±20% range), spread-spectrum modulation (±6%, factory-enabled in S-version), and soft-start (5.6–12ms).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V (42V transient tolerant); enables direct connection to automotive battery without pre-regulation. |
| Output Current | 3.5A continuous; supports point-of-load rails for infotainment processors and RF transceivers. |
| Quiescent Current | 28µA at no load; meets automotive standby power requirements (e.g., always-on modules). |
| Switching Frequency | 220kHz to 2.2MHz (resistor- or clock-programmable); allows trade-off between inductor size and switching loss. |
| Output Voltage | Fixed 5V ±2%; eliminates external feedback resistors and simplifies layout for standard logic rails. |
| Operating Temperature | -40°C to +125°C; qualified per AEC-Q100 Grade 0; validated for under-hood and dashboard mounting. |
| Protection Features | Cycle-by-cycle current limit, thermal shutdown (175°C, 15°C hysteresis), overvoltage (107%), and power-good monitoring. |
Pinout & Package
MAX16935RATEB/V+T is housed in a 16-pin 5mm × 5mm TQFN-EP package with exposed pad connected to PGND for thermal management. Pin count, pad layout, and thermal resistance (θJA = 35°C/W) are optimized for high-power density automotive PCBs.
| 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 | Logic-level input: grounded → skip mode; tied to BIAS or external clock → forced PWM; enables EMI control in RF-sensitive designs. |
| 3 – FOSC | Frequency programming node | Resistor-to-AGND sets fSW; e.g., 12kΩ yields 2.2MHz; supports precise EMI band placement and inductor sizing. |
| 4 – OUT | Regulated output | 5V fixed output; powers downstream logic and internal circuitry when VOUT ≥ 3V; requires 22µF ceramic output capacitor. |
| 5 – FB | Feedback reference input | Internally tied to 1.0V reference; unused in fixed-5V configuration (pin connected to BIAS per datasheet). |
| 6 – COMP | Error amplifier output | Connect RC compensation network (e.g., 10kΩ + 1nF) to AGND for stable loop response across full load/temperature range. |
| 7 – BIAS | Integrated 5V LDO output | Powers internal analog blocks; bypassed with 1µF ceramic capacitor; regulates independently of OUT voltage. |
| 8 – AGND | Analog ground reference | Separate from PGND; must be star-connected near COMP/FB pins to minimize noise coupling into regulation loop. |
| 9 – BST | High-side gate driver supply | Connected via 0.1µF capacitor to LX; provides bootstrap voltage for high-side MOSFET drive above input rail. |
| 10 – EN | Enable input | 3.3V–42V compatible; asserts at >2.4V, deasserts at <0.6V; supports direct connection to KL30 or CAN transceiver INH pin. |
| 11 – SUP | Main supply input | Powers internal LDO (BIAS); bypassed with 4.7µF ceramic capacitor; accepts full 3.5–36V automotive range. |
| 12 – SUPSW | Switch supply input | Powers internal high-side MOSFET driver; bypassed with 0.1µF + 4.7µF ceramics; decoupled separately from SUP for noise isolation. |
| 13–14 – LX | Switching node | Connects to external Schottky diode cathode and inductor; high dv/dt node requiring tight layout and guard ring. |
| 15 – PGND | Power ground | High-current return path for LX, SUPSW, and output capacitor; must be low-inductance plane connected to EP. |
| 16 – PGOOD | Open-drain power-good | Active-low signal asserting when VOUT > 95% of 5V (4.75V); used for system power sequencing and fault detection. |
| EP – Exposed Pad | Thermal & electrical ground | Must be soldered to large copper pour tied to PGND; primary thermal path (θJC = 2.7°C/W); not sole ground connection. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.5A high- and low-side MOSFETs | Eliminates external switch components; reduces BOM count and layout area while maintaining 95% peak efficiency at 2.2MHz. |
| 180° out-of-phase SYNCOUT | Enables two-phase interleaved operation with second MAX16935, cutting input/output ripple current by ~70% and easing EMI filtering. |
| Automatic LX slew-rate control | Adjusts gate drive rise time (4ns/8ns) based on fSW to minimize EMI without sacrificing efficiency across 220kHz–2.2MHz range. |
| AEC-Q100 qualified (-40°C to +125°C) | Validated for automotive applications including engine control, ADAS sensors, and infotainment systems with extended temperature life testing. |
| Fixed 5V output with ±2% accuracy | Guaranteed over full temperature and line/load range; removes need for external feedback divider and associated tolerance stack-up errors. |
| 28µA quiescent current in standby | Meets ISO 16750-2 "parking mode" requirements; enables always-on functionality in telematics and alarm modules without battery drain. |
Applications
| Navigation Head Unit Power Supply | RF Transceiver Bias Rail |
|---|---|
|
Use Scenario: Powers display controller, GPS baseband, and audio DAC in automotive infotainment head units with cold-crank (4.5V) and load-dump (42V) events. IC Role / Device Role / Timing Role: Primary 5V POL regulator delivering 3.5A with fast transient response and 98% duty cycle capability during undervoltage. Use Value: Maintains system operation through 15ms cold-crank dips; eliminates need for external pre-regulator or hold-up capacitors. |
Use Scenario: Supplies clean, low-noise 5V bias to LTE/Wi-Fi transceivers where spectral purity and EMI compliance are critical. IC Role / Device Role / Timing Role: Fixed-frequency FPWM-mode regulator synchronized to system clock to suppress switching harmonics in RF bands. Use Value: Reduces conducted EMI by >10dB vs. skip mode; enables single-layer filter design meeting CISPR 25 Class 5 limits. |
| Distributed DC Power System | Industrial Camera Module Supply |
|
Use Scenario: Generates 5V from 12–24V industrial bus for multiple camera, sensor, and I/O modules in machine vision systems. IC Role / Device Role / Timing Role: Cascaded power stage using SYNCOUT-to-FSYNC daisy-chain to phase-shift outputs and reduce input capacitor RMS current. Use Value: Lowers total input capacitance requirement by 40% and extends capacitor lifetime in high-temperature enclosures. |
Use Scenario: Powers image sensor, ISP, and USB 3.0 interface in automotive surround-view cameras operating in under-hood environments. IC Role / Device Role / Timing Role: AEC-Q100 qualified buck converter with thermal shutdown and overvoltage protection for safety-critical vision systems. Use Value: Survives 150°C junction temperature excursions during thermal runaway; maintains regulation until shutdown threshold is reached. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRNXTQ1 | 3.6A, 36V, 2.1MHz; fixed 5V option available; 15µA IQ; no integrated low-side FET (asynchronous); no SYNCOUT phase shift. | Lacks 180° SYNCOUT for interleaving; requires external Schottky diode; lower IQ benefits ultra-low-power standby but sacrifices light-load efficiency control. | Select when lowest quiescent current is priority and cascaded supply architecture is not required. |
| TPS54560QDGQRQ1 | 5A, 60V, 2.2MHz; adjustable only (0.8–58V); 145µA IQ; no BIAS LDO; no AEC-Q100 Grade 0 rating; no spread spectrum. | Higher input voltage range suits 48V systems; lacks fixed 5V option and integrated BIAS rail; wider temp range (-40°C to +150°C) but unqualified for automotive. | Select for 48V industrial or commercial systems needing higher current and wider VIN, not automotive-qualified designs. |
Compared with LM61480QRNXTQ1 and TPS54560QDGQRQ1, MAX16935RATEB/V+T uniquely combines AEC-Q100 Grade 0 qualification, integrated low-side FET for FPWM light-load operation, 180° SYNCOUT for interleaving, and fixed 5V output-making it optimal for space-constrained, EMI-sensitive automotive POL applications where reliability and feature integration outweigh minimal IQ differences.
Availability
MAX16935RATEB/V+T is available at Aetrix Electronics and suitable for automotive navigation systems, RF transceiver bias rails, distributed industrial power architectures, and safety-critical camera modules requiring stable component supply across extended temperature and voltage stress conditions.
Supply support for MAX16935RATEB/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 precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.
The MAX16935 family targets automotive power conversion with AEC-Q100 qualification, wide-input capability, and features like SYNCOUT interleaving and cold-crank support-enabling robust, compact, and EMI-compliant DC/DC solutions for next-generation vehicle electronics.
FAQ
What is the output voltage configuration of the MAX16935RATEB/V+T?
The MAX16935RATEB/V+T is a fixed 5V output variant. Its FB pin is internally configured for 5V regulation with ±2% accuracy across -40°C to +125°C and full line/load conditions. No external feedback resistors are required-FB is connected to BIAS per the datasheet for this version. This simplifies design and improves long-term stability versus adjustable configurations.
Does the MAX16935RATEB/V+T support forced PWM (FPWM) mode, and how is it enabled?
Yes, the MAX16935RATEB/V+T supports forced PWM mode across all load conditions. It is enabled by driving the FSYNC pin high-either by connecting it to the BIAS pin (5V) or to an external clock source. In FPWM mode, the internal low-side MOSFET remains active, eliminating frequency variation and minimizing EMI, which is essential for RF transceiver power supplies.
What package type and thermal characteristics does the MAX16935RATEB/V+T use?
The MAX16935RATEB/V+T uses a 16-pin 5mm × 5mm TQFN-EP package with exposed thermal pad. Its junction-to-ambient thermal resistance is 35°C/W (JEDEC 51 multilayer board), and junction-to-case is 2.7°C/W. The EP must be soldered to a large PGND copper area to achieve rated 3.5A continuous current and prevent thermal shutdown under sustained load.
Is the MAX16935RATEB/V+T qualified for automotive applications?
Yes, the MAX16935RATEB/V+T is AEC-Q100 qualified (Grade 0: -40°C to +125°C ambient). It undergoes rigorous stress testing for automotive reliability, including HTOL, TC, UHAST, and ESD. Its 42V transient tolerance, cold-crank operation down to 3.5V, and integrated protections (OVP, thermal shutdown, current limit) meet ISO 16750-2 requirements for powertrain and body electronics.
How does the SYNCOUT pin function in the MAX16935RATEB/V+T?
The SYNCOUT pin on the MAX16935RATEB/V+T provides an open-drain 180° out-of-phase clock signal relative to the internal oscillator. When used with a second MAX16935 in a cascaded configuration-by connecting SYNCOUT to its FSYNC-the two devices operate in interleaved phase, reducing input/output ripple current and easing EMI filter design without external timing components.
MAX16935RATEB/V+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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)
MAX16935RATEB/V+T FAQ
1.How can I place an order for MAX16935RATEB/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16935RATEB/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 MAX16935RATEB/V+T reliable?
The price and inventory of MAX16935RATEB/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 MAX16935RATEB/V+T is usually 5 days.
3.What payment methods are accepted for MAX16935RATEB/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16935RATEB/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16935RATEB/V+T?
MAX16935RATEB/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16935RATEB/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 MAX16935RATEB/V+T?
For technical support, including MAX16935RATEB/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16935RATEB/V+T requirements.
6.How does Aetrix verify that MAX16935RATEB/V+T is sourced from the original manufacturer or authorized distributors?
All MAX16935RATEB/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 MAX16935RATEB/V+T meets industry standards.
7.What is the process for return or replacement of MAX16935RATEB/V+T?
All MAX16935RATEB/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16935RATEB/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 MAX16935RATEB/V+T part is unused and in its original packaging.
Return procedure for MAX16935RATEB/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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