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Analog Devices Inc./Maxim Integrated MAX16935CAUES/V+
- Part No.:
- MAX16935CAUES/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX16935CAUES/V+.pdf
- Description:
- IC REG STP DWN 36V 3.5A 16TSSOP
- Quantity:
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Inventory:3,578
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Product details
Overview
MAX16935CAUES/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 requiring 3.5V–36V input, 5V fixed output (±2%), 28µA no-load quiescent current, and 2.2MHz switching frequency - used in navigation head units and RF-sensitive infotainment systems.
For engineers reviewing the MAX16935CAUES/V+ datasheet, MAX16935CAUES/V+ pinout, MAX16935CAUES/V+ application, or MAX16935CAUES/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 rails, and thermal shutdown with automatic recovery.
Technical Context
The MAX16935CAUES/V+ implements a current-mode control architecture with resistor-programmable oscillator (220kHz–2.2MHz), automatic LX slew-rate adjustment (4ns/8ns based on fSW), and dual-mode operation: skip mode for light-load efficiency or forced-PWM (FPWM) for EMI-critical RF transceiver supplies. Its integrated 100mΩ high-side and 3Ω low-side MOSFETs enable fixed-frequency regulation down to zero load.
It features a dedicated 5V BIAS LDO (4.7–5.4V, ±650mV UVLO hysteresis), open-drain PGOOD with 95%/92% VFB thresholds, and overvoltage protection (107% of regulated output). The device supports external synchronization (1.8–2.6MHz), spread-spectrum modulation (±6%), and operates across –40°C to +125°C with AEC-Q100 Grade-1 compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V (42V transient tolerant); supports automotive cold-crank (≥3.5V) and load-dump (≤42V, <1s) conditions |
| Output Current | 3.5A continuous RMS; enables single-rail supply for multi-core MCU or SoC in automotive ECUs |
| Quiescent Current | 28µA at no load; meets ISO 16750-2 standby power requirements for always-on vehicle modules |
| Switching Frequency | 2.2MHz (RFOSC = 12kΩ); allows compact 2.2µH inductor and reduces EMI above AM band |
| Output Voltage Accuracy | ±2% for 5V fixed output; ensures stable core voltage for 3.3V/5V logic without external feedback resistors |
| Duty Cycle Max | 98%; sustains regulation during undervoltage transients (e.g., 5V out from 5.1V input) |
| Thermal Protection | 175°C shutdown with 15°C hysteresis; prevents latch-up during sustained overload or poor PCB heatsinking |
Pinout & Package
MAX16935CAUES/V+ is housed in a 16-pin, 5mm × 5mm TQFN-EP package with exposed pad connected to PGND for thermal dissipation. Pin count, layout, and thermal metrics match JEDEC MO-220WEED package standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – SYNCOUT | Open-drain clock output | 180° out-of-phase signal relative to internal oscillator; enables interleaved operation with second MAX16935 for 7A total output |
| 2 – FSYNC | Mode control & sync input | Logic-selectable: AGND = skip mode; BIAS or external clock = FPWM; enables EMI-controlled RF supply sequencing |
| 3 – FOSC | Oscillator frequency setting | Resistor-to-AGND sets fSW; 12kΩ yields 2.2MHz - critical for minimizing inductor size in space-constrained head units |
| 4 – OUT | Power output node | Delivers regulated 5V; also powers internal circuitry when VOUT ≥3V, eliminating need for separate bias rail |
| 5 – FB | Feedback reference input | 1.0V internal reference; tied to BIAS for 5V fixed output; enables 1V–10V adjustable regulation via resistor divider |
| 6 – COMP | Error amplifier output | Connect RC compensation network here; 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; UVLO threshold 3.15V (typ) |
| 8 – AGND | Analog ground reference | Separate from PGND to minimize noise coupling into feedback and oscillator circuits |
| 9 – BST | High-side gate driver supply | 0.1µF bootstrap capacitor between BST and LX enables high-side MOSFET drive above input rail |
| 10 – EN | Enable input | 3.3V–42V compatible; 2.4V threshold enables direct connection to KL30 battery or CAN transceiver INH pin |
| 11 – SUP | Main logic supply input | Powers internal LDO; bypassed with 4.7µF ceramic to PGND; supports RC filter for noise reduction |
| 12 – SUPSW | Switch supply input | Powers high-side MOSFET driver; bypassed with 0.1µF + 4.7µF ceramics to PGND for low-impedance switching return |
| 13–14 – LX | Switching node | Connects to Schottky diode cathode and inductor; automatic slew-rate control optimizes EMI vs. efficiency trade-off |
| 15 – PGND | Power ground | High-current return path for LX, SUPSW, and output capacitor; must be low-inductance plane under EP |
| 16 – PGOOD | Open-drain power-good flag | Asserts high when VOUT >95% of regulation; used for sequenced startup of downstream processors or FPGAs |
| EP – Exposed Pad | Thermal & electrical ground | Must connect to large-area PGND copper pour; not sole ground path - use multiple vias to inner ground planes |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.5A High-Side Switch | 100mΩ RDS(on) at 1A/5V BIAS; eliminates external high-side FET and driver, reducing BOM count by ≥4 components |
| 180° Out-of-Phase SYNCOUT | Enables two MAX16935CAUES/V+ devices to interleave 2.2MHz clocks, halving input/output ripple current and shrinking bulk capacitance |
| Automotive Temperature Range | –40°C to +125°C ambient; validated per AEC-Q100 Grade-1; supports under-hood and dashboard mounting without derating |
| Spread-Spectrum Modulation | ±6% frequency dither centered on fOSC; reduces peak EMI emissions by up to 10dB without altering layout or filtering |
| Power-Good Monitor | Programmable 95%/92% VFB thresholds with 10–50µs debounce; simplifies power sequencing in multi-rail ADAS camera modules |
| Fixed-Frequency FPWM Mode | Eliminates variable-frequency skip-mode noise; essential for RF transceivers in telematics units where spectral purity is mandated |
Applications
| Navigation Head Unit Power Supply | Automotive Telematics RF Transceiver Supply |
|---|---|
Use Scenario: Powers display controller, audio codec, and GPS baseband IC in centralized infotainment head unit with 12V battery input. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering 3.5A with tight load/line regulation (±0.5%) and fast transient response (<10µs). Use Value: 28µA quiescent current extends battery life in accessory-off state; 98% duty cycle maintains 5V output during 6V cold-crank events. |
Use Scenario: Supplies clean 5V to LTE/C-V2X transceiver IC in vehicle-to-everything (V2X) communication module. IC Role / Device Role / Timing Role: Fixed-frequency FPWM regulator synchronized to system clock to suppress switching noise in RF receive band. Use Value: 2.2MHz FPWM operation shifts noise spectrum above 1GHz, avoiding interference with sub-6GHz cellular bands. |
| ADAS Camera Module Core Rail | Body Control Module (BCM) Microcontroller Supply |
Use Scenario: Provides 5V core power to image signal processor (ISP) and MIPI CSI-2 serializer in rear-view camera ECU. IC Role / Device Role / Timing Role: Cascaded power stage using SYNCOUT to drive second MAX16935CAUES/V+, doubling output current to 7A. Use Value: 180° phase shift cuts input capacitor RMS current by 30%, enabling smaller 1206-size ceramic input caps. |
Use Scenario: Delivers always-on 5V supply to low-power microcontroller in door module or seat control unit. IC Role / Device Role / Timing Role: Skip-mode regulator operating at <100mA load; leverages ultra-low 28µA IQ to meet ISO 16750-2 Class D leakage limits. Use Value: Automatic transition to skip mode below 300mA reduces average input current by 65% vs. FPWM at light loads. |
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 | 4.5A rated, 3.5V–36V input, 12µA IQ, but no integrated low-side FET - requires external Schottky diode or synchronous rectifier | Lacks 180° SYNCOUT and FPWM/skip mode pin control; less suitable for RF-sensitive or cascaded multi-rail designs | Select when higher output current (4.5A) is required and external diode placement is acceptable in layout |
| TPS62933RTER | 3A rated, 3V–36V input, 15µA IQ, 2.2MHz fixed frequency, but no AEC-Q100 qualification or automotive temp range | Not qualified for automotive use; lacks cold-crank support (min VIN = 3V), thermal shutdown hysteresis, and load-dump tolerance | Select for industrial or commercial applications where AEC-Q100 and –40°C operation are not required |
Compared with LM61480QRNXTQ1 and TPS62933RTER, the MAX16935CAUES/V+ uniquely combines AEC-Q100 Grade-1 qualification, integrated low-side FET for true FPWM light-load operation, 180° SYNCOUT for interleaving, and 98% duty cycle - making it the only choice for safety-critical automotive power rails demanding both reliability and EMI control.
Availability
MAX16935CAUES/V+ is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and telematics systems requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for MAX16935CAUES/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.
The MAX16935CAUES/V+ belongs to Maxim's automotive-grade DC-DC converter family, engineered specifically for harsh-environment vehicle subsystems requiring wide VIN, ultra-low IQ, and robust fault protection.
FAQ
What is the maximum input voltage the MAX16935CAUES/V+ can withstand during load-dump events?
The MAX16935CAUES/V+ supports 42V transient input for ≤1 second during load-dump events, as specified in its Absolute Maximum Ratings. This rating applies to both SUP and SUPSW pins, ensuring reliable operation in 12V automotive systems meeting ISO 7637-2 Pulse 5a requirements. The device remains functional after such transients without latch-up or parameter shift.
Does the MAX16935CAUES/V+ require an external Schottky diode, and why?
Yes, the MAX16935CAUES/V+ requires an external Schottky diode connected from LX to AGND. Although it integrates both high-side and low-side MOSFETs, the low-side FET is used only for FPWM mode and cannot fully replace the diode's conduction path during all operating conditions - especially during startup, light-load skip mode, or fault recovery. The diode ensures continuous current path and improves efficiency across the full load range.
How does the FSYNC pin control operation mode in the MAX16935CAUES/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; connecting it to BIAS or an external clock (1.8–2.6MHz) enables FPWM mode for constant-frequency operation. This pin directly controls the low-side MOSFET gate driver logic, allowing real-time EMI optimization without changing external components.
What is the purpose of the SYNCOUT pin on the MAX16935CAUES/V+?
The SYNCOUT pin provides an open-drain 180° out-of-phase clock signal relative to the internal oscillator. It enables precise interleaving of two or more MAX16935CAUES/V+ devices to reduce input/output ripple current, lower RMS capacitor stress, and shrink overall filter component size - critical for high-current automotive power rails like those feeding multi-core SoCs in head units.
Is the MAX16935CAUES/V+ qualified for automotive use, and what standards does it meet?
Yes, the MAX16935CAUES/V+ is AEC-Q100 qualified (Grade 1: –40°C to +125°C ambient), with full validation across temperature, humidity, mechanical shock, and ESD stress tests. It meets automotive requirements for cold-crank (3.5V min VIN), load-dump (42V/1s), and ISO 16750-2 standby leakage current (enabled by 28µA IQ). Its thermal shutdown (175°C) and overvoltage protection further ensure robustness in vehicle environments.
MAX16935CAUES/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:
- -
MAX16935CAUES/V+ FAQ
1.How can I place an order for MAX16935CAUES/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16935CAUES/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 MAX16935CAUES/V+ reliable?
The price and inventory of MAX16935CAUES/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16935CAUES/V+ is usually 5 days.
3.What payment methods are accepted for MAX16935CAUES/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16935CAUES/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16935CAUES/V+?
MAX16935CAUES/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16935CAUES/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 MAX16935CAUES/V+?
For technical support, including MAX16935CAUES/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16935CAUES/V+ requirements.
6.How does Aetrix verify that MAX16935CAUES/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16935CAUES/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 MAX16935CAUES/V+ meets industry standards.
7.What is the process for return or replacement of MAX16935CAUES/V+?
All MAX16935CAUES/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16935CAUES/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 MAX16935CAUES/V+ part is unused and in its original packaging.
Return procedure for MAX16935CAUES/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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