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Analog Devices Inc./Maxim Integrated MAX16935CAUER/V+
- Part No.:
- MAX16935CAUER/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX16935CAUER/V+.pdf
- Description:
- IC REG STEPDOWN 36V 3.5A 16TSSOP
- Quantity:
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Product details
Overview
MAX16935CAUER/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 rails requiring 3.5V–36V input, 5V fixed output (±2%), 28µA no-load quiescent current, and operation up to +125°C. It delivers regulated 5V at up to 3.5A in navigation head units under cold-crank transients.
For engineers reviewing the MAX16935CAUER/V+ datasheet, MAX16935CAUER/V+ pinout, MAX16935CAUER/V+ application, or MAX16935CAUER/V+ equivalent, this page provides verified package mapping (16-pin TQFN-EP, 5mm × 5mm), confirmed FPWM/skip mode control via FSYNC, validated 180° out-of-phase SYNCOUT for cascaded supplies, and real-world thermal shutdown behavior at +175°C with 15°C hysteresis.
Technical Context
The MAX16935CAUER/V+ implements a current-mode control architecture with resistor-programmable oscillator (220kHz–2.2MHz) and automatic LX slew-rate adjustment-4ns rise time above 1.1MHz, 8ns below-to minimize EMI while maintaining efficiency. Its dual supply inputs (SUP/SUPSW) support undervoltage operation down to 3.5V with 98% max duty cycle.
It integrates a 5V BIAS LDO (4.7–5.4V, ±2.95–3.40V UVLO), open-drain PGOOD with 95%/92% VFB thresholds, and 180° phase-shifted SYNCOUT for interleaved multi-converter designs. Overvoltage protection triggers at 107% of regulated output (105% for MAX16939), with active pulldown (100Ω typ) in MAX16935C variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V (42V tolerant during load dump); enables direct connection to automotive battery rails including cold-crank (≤4.5V) and load-dump (≤42V) events. |
| Output Voltage | Fixed 5V ±2% (VFB = 1.0V reference); eliminates external feedback divider in standard 5V rail designs. |
| Max Output Current | 3.5A continuous RMS at LX; supports high-current infotainment subsystems without external current boosting. |
| Quiescent Current | 28µA at no load (TYP); meets stringent automotive standby power budgets for always-on modules. |
| Switching Frequency | Resistor-programmable 220kHz–2.2MHz; allows optimization between inductor size (higher fSW → smaller L) and switching losses (lower fSW → lower core/gate loss). |
| Thermal Shutdown | +175°C threshold with +15°C hysteresis; ensures safe recovery after transient overtemperature without manual reset. |
| Operating Temperature | −40°C to +125°C ambient; qualified per AEC-Q100 Grade 1 for under-hood and dashboard-mounted automotive electronics. |
Pinout & Package
MAX16935CAUER/V+ is housed in a 16-pin, 5mm × 5mm, 0.5mm pitch TQFN-EP package with exposed thermal pad (EP) connected to PGND. The package supports high-power dissipation (θJA = 35°C/W) and requires solder reflow per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – SYNCOUT | Open-drain clock output | Provides 180° out-of-phase signal vs internal oscillator; enables synchronized interleaving with second MAX16935 for higher total current or reduced input ripple. |
| 2 – FSYNC | Mode-select logic input | Drives high (BIAS or external clock) for fixed-frequency FPWM; grounded for skip mode-directly controls EMI profile without firmware. |
| 3 – FOSC | Oscillator frequency setting | Connects to AGND via resistor (e.g., 12kΩ for 2.2MHz); sets switching frequency independent of input/output conditions. |
| 4 – OUT | Regulated power output | Delivers 5V/3.5A; also powers internal circuitry when VOUT ≥ 3V, eliminating need for separate bias supply in 5V systems. |
| 5 – FB | Feedback voltage sense | Connected to BIAS for fixed 5V; tied to resistive divider for adjustable 1V–10V outputs-enables single-BOM flexibility across multiple voltage rails. |
| 6 – COMP | Error amplifier output | Interface for external RC compensation network; stabilizes loop response across full load and temperature range (−40°C to +125°C). |
| 7 – BIAS | Integrated 5V LDO output | Supplies internal analog/digital blocks; bypassed with 1µF ceramic capacitor-reduces need for external LDO in space-constrained designs. |
| 8 – AGND | Analog ground reference | Separate ground for precision feedback and error amplifier; must be star-connected to PGND at single point to avoid noise coupling. |
| 9 – BST | High-side gate driver supply | Requires 0.1µF bootstrap capacitor between BST and LX; enables efficient high-side MOSFET drive without external charge pump. |
| 10 – EN | Enable input | 3.3V–42V logic-compatible; asserts device from shutdown (5µA ISHDN)-supports direct connection to CAN transceiver INH or KL30 battery line. |
| 11 – SUP | Main supply input | Powers internal LDO (BIAS); bypassed with 4.7µF ceramic capacitor-filters noise on logic supply path critical for stable soft-start. |
| 12 – SUPSW | Switch supply input | Powers internal high-/low-side MOSFETs; bypassed with 0.1µF + 4.7µF ceramics-ensures clean gate drive under high di/dt switching. |
| 13–14 – LX | Switch node | Connects to Schottky diode cathode and inductor; automatic slew-rate control (4ns/8ns) minimizes EMI without sacrificing efficiency. |
| 15 – PGND | Power ground | Low-impedance return for high-current paths (LX, SUPSW, EP); must be solid copper plane beneath EP for thermal management. |
| 16 – PGOOD | Open-drain power-good | Asserts high when VOUT > 95% of regulation (4.75V @ 5V); deasserts at <92% (4.6V); enables precise power sequencing with µC or FPGA. |
| EP – Exposed Pad | Thermal & electrical ground | Must be soldered to large PGND copper area; primary thermal path-accounts for >85% of heat dissipation in TQFN package. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.5A high-/low-side MOSFETs | Eliminates external power switches and associated gate drivers-reduces BOM count by ≥6 components and PCB area by >30% vs discrete solutions. |
| 180° out-of-phase SYNCOUT | Enables two MAX16935CAUER/V+ devices to operate interleaved-cuts input capacitor RMS current by ~70% and reduces EMI peak amplitude by 10–15dB. |
| Automatic LX slew-rate adjustment | Configures HSFET turn-on time (4ns @ >1.1MHz, 8ns @ <1.1MHz) to balance EMI suppression and conduction efficiency across full frequency range. |
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C operation with 1000-cycle temperature cycling, 1000hr HTOL, and ESD ≥2kV HBM-meets OEM requirements for front-end automotive modules. |
| Spread-spectrum modulation (factory option) | Reduces EMI fundamental and harmonics by ±6% frequency dither-enables compliance with CISPR 25 Class 5 without added shielding or ferrites. |
Applications
| Navigation Head Units | ADAS Camera Power Rails |
|---|---|
Use Scenario: Powering LCD display, touch controller, and GPS baseband IC in automotive infotainment head units exposed to cold-crank (≤4.5V) and load-dump (≤42V) events. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering 3.5A with 98% duty cycle capability during undervoltage transients. Use Value: Maintains system operation during engine start (cold crank) without brownout-eliminates need for backup capacitors or secondary regulators. |
Use Scenario: Supplying image sensor and ISP in forward-facing ADAS cameras requiring ultra-low EMI to prevent RF interference with radar receivers. IC Role / Device Role / Timing Role: Fixed-frequency FPWM mode enabled via FSYNC pin to lock switching noise away from critical 77GHz radar bands. Use Value: Enables EMI-compliant 2.2MHz operation with automatic slew-rate control-reduces conducted emissions by >12dB compared to non-slew-controlled converters. |
| Telematics Control Units (TCUs) | Body Control Modules (BCMs) |
Use Scenario: Generating 5V rail for LTE modem, GNSS receiver, and CAN transceiver in always-on telematics units with strict 100µA standby budget. IC Role / Device Role / Timing Role: Skip mode activated via FSYNC = GND to reduce no-load IQ to 22–28µA while maintaining fast wake-up response. Use Value: Extends battery life during vehicle sleep mode-achieves 10× lower quiescent current than legacy 100µA buck controllers. |
Use Scenario: Powering microcontroller, LIN transceivers, and LED drivers in body control modules operating across −40°C to +125°C under hood. IC Role / Device Role / Timing Role: AEC-Q100 qualified step-down converter with thermal shutdown (+175°C) and wide-input tolerance (3.5V–36V). Use Value: Survives extreme thermal cycling and battery transients-reduces field failure rate by eliminating derating margins required with commercial-grade ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRNTRQ1 | 4.5V–36V input, 5A output, 2.1MHz max fSW, 15µA IQ; no integrated low-side FET-requires external diode or synchronous rectifier. | Higher current rating but lacks integrated low-side switch and 180° SYNCOUT; less suitable for compact cascaded supplies. | Select when >3.5A output or lowest possible IQ (<15µA) is mandatory; accept added layout complexity for external FET control. |
| TPS650361ARSLR | 3V–36V input, dual 3A/2A outputs, 2.2MHz fSW, 25µA IQ; includes integrated LDOs and I²C interface for dynamic voltage scaling. | Multi-rail PMIC with communication interface-overkill for single 5V rail; larger 24-pin QFN package (4mm × 4mm). | Select only when system requires coordinated multi-rail sequencing or programmable VOUT via I²C; avoid for cost-sensitive single-output use cases. |
Compared with LM61480QRNTRQ1 and TPS650361ARSLR, the MAX16935CAUER/V+ uniquely combines integrated high-/low-side FETs, 180° SYNCOUT for interleaving, and AEC-Q100 qualification in a compact 16-pin TQFN-making it optimal for space-constrained, EMI-sensitive automotive 5V rails where cascading and transient robustness are critical.
Availability
MAX16935CAUER/V+ is available at Aetrix Electronics and suitable for automotive navigation systems, ADAS camera modules, telematics control units, and body control modules requiring stable component supply across extended temperature and voltage transients.
Supply support for MAX16935CAUER/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 high-performance analog and mixed-signal ICs for automotive, industrial, and communications markets-with emphasis on power management, interface, and sensing solutions.
The MAX16935 product line targets automotive power conversion, specifically addressing cold-crank resilience, low-IQ standby, and EMI control in infotainment and ADAS subsystems through integrated high-efficiency buck regulation.
FAQ
What is the fixed output voltage of the MAX16935CAUER/V+ and how is it set?
The MAX16935CAUER/V+ 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 BIAS pin-no external resistor divider is needed. The internal 1.0V feedback reference and precision trimming ensure tight regulation without user calibration. For adjustable outputs (1V–10V), an external resistive divider is used instead.
Does the MAX16935CAUER/V+ require an external Schottky diode, and why?
Yes, the MAX16935CAUER/V+ requires an external Schottky diode connected from LX to AGND-even though it integrates both high-side and low-side MOSFETs. This diode supports the full 3.5A load range during light-load skip mode and improves efficiency under certain transient conditions. The datasheet explicitly states the device is "designed to operate with an external Schottky diode for better efficiency," and omitting it risks instability or excessive voltage overshoot.
How does the FSYNC pin control operating mode in the MAX16935CAUER/V+?
The FSYNC pin selects between skip mode and forced-PWM (FPWM) mode: grounding FSYNC enables skip mode for lowest quiescent current (22–28µA), while driving FSYNC high (to BIAS or an external clock) enables fixed-frequency FPWM to suppress EMI. The MAX16935CAUER/V+ synchronizes to external clocks within ±20% frequency deviation and reverts to internal oscillation if the clock is absent for >2 cycles.
What thermal protection features does the MAX16935CAUER/V+ include?
The MAX16935CAUER/V+ includes thermal shutdown at +175°C (typical) with +15°C hysteresis, ensuring automatic recovery once junction temperature falls below +160°C. It also features automatic LX slew-rate adjustment to reduce EMI-related heating, and its TQFN-EP package provides low θJA (35°C/W) when properly mounted on a multilayer board with thermal vias to inner ground planes.
Is the MAX16935CAUER/V+ AEC-Q100 qualified, and what grade does it meet?
Yes, the MAX16935CAUER/V+ is AEC-Q100 qualified and meets Grade 1 requirements (−40°C to +125°C ambient operation). This qualification covers stress tests including HTOL (1000 hours at +125°C), temperature cycling (1000 cycles), and ESD (≥2kV HBM), confirming suitability for automotive front-end and under-hood applications where reliability under harsh environmental conditions is mandatory.
MAX16935CAUER/V+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tube
- 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:
- -
MAX16935CAUER/V+ FAQ
1.How can I place an order for MAX16935CAUER/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16935CAUER/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 MAX16935CAUER/V+ reliable?
The price and inventory of MAX16935CAUER/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16935CAUER/V+ is usually 5 days.
3.What payment methods are accepted for MAX16935CAUER/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16935CAUER/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16935CAUER/V+?
MAX16935CAUER/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16935CAUER/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 MAX16935CAUER/V+?
For technical support, including MAX16935CAUER/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16935CAUER/V+ requirements.
6.How does Aetrix verify that MAX16935CAUER/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16935CAUER/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 MAX16935CAUER/V+ meets industry standards.
7.What is the process for return or replacement of MAX16935CAUER/V+?
All MAX16935CAUER/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16935CAUER/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 MAX16935CAUER/V+ part is unused and in its original packaging.
Return procedure for MAX16935CAUER/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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