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Analog Devices Inc./Maxim Integrated MAX16935SAUE/V+T
- Part No.:
- MAX16935SAUE/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16935SAUE/V+T.pdf
- Description:
- IC REG BUCK ADJ/1V 3.5A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX16935SAUE/V+T 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 2.2MHz switching frequency. It supports forced-PWM (FPWM) and skip modes, features AEC-Q100 qualification, and targets 12V/24V battery-fed systems such as infotainment head units.
For engineers reviewing the MAX16935SAUE/V+T datasheet, MAX16935SAUE/V+T pinout, MAX16935SAUE/V+T application, or MAX16935SAUE/V+T equivalent, key selection considerations include its 98% max duty cycle for cold-crank support, 180° out-of-phase SYNCOUT for cascaded supplies, integrated BIAS LDO, thermal shutdown with auto-recovery, and compatibility with external Schottky diodes for efficiency optimization in automotive environments.
Technical Context
The MAX16935SAUE/V+T 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 selected via FSYNC: skip mode for ultra-low IQ or FPWM for EMI-sensitive RF supply rails. Its dual-supply inputs (SUP/SUPSW) enable robust cold-crank handling down to 3.5V while maintaining regulation.
It integrates a 5V BIAS LDO (4.7–5.4V, ±2% over temp), power-good monitor (PGOOD with 95%/92% thresholds), overvoltage protection (107% of VFB), and cycle-by-cycle current limiting. 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 - supports 12V/24V automotive batteries including load-dump (42V tolerant) and cold-crank transients. |
| Output Current | 3.5A continuous - sufficient for powering SoCs, DSPs, and display controllers in navigation systems. |
| Quiescent Current | 28µA at no load - enables always-on functionality in vehicle body electronics without excessive battery drain. |
| Switching Frequency | 220kHz to 2.2MHz (resistor-programmable) - allows trade-off between inductor size, EMI, and efficiency; 2.2MHz enables compact 2.2µH inductors. |
| Output Voltage | Fixed 5V (±2%) - eliminates external feedback resistors for simplified layout and improved accuracy in noise-sensitive applications. |
| Max Duty Cycle | 98% - sustains regulation during undervoltage events (e.g., engine cranking at ≤6V input). |
| Thermal Protection | 175°C shutdown with 15°C hysteresis - ensures safe operation under sustained overload or poor PCB heatsinking. |
Pinout & Package
MAX16935SAUE/V+T is housed in a 16-pin, 5mm × 5mm TQFN-EP package with exposed pad for thermal dissipation. The EP must be soldered to a large-area PGND copper plane; it is not a functional pin but critical for thermal performance (θJA = 35°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 – SYNCOUT | Open-drain clock output | Provides 180° out-of-phase signal relative to internal oscillator - enables synchronized cascading of multiple converters to reduce input ripple and improve power density. |
| 2 – FSYNC | Mode select / sync input | Logic-level input: tied to AGND → skip mode; tied to BIAS or external clock → FPWM mode - critical for EMI control in RF transceiver power supplies. |
| 3 – FOSC | Oscillator frequency setting | Resistor-to-AGND sets fSW (e.g., 12kΩ → 2.2MHz); enables precise frequency tuning without crystal or external PLL. |
| 4 – OUT | Regulated output node | Delivers 5V @ 3.5A; also powers internal circuitry when VOUT ≥ 3V - simplifies biasing in standby mode. |
| 5 – FB | Feedback input | Connected to BIAS for fixed 5V; otherwise used with resistor divider for adjustable 1V–10V outputs - supports flexible system voltage scaling. |
| 6 – COMP | Error amplifier output | Interface for external RC compensation network - stabilizes loop response across wide input/output conditions and temperature. |
| 7 – BIAS | Integrated 5V LDO output | Supplies internal logic and gate drivers; bypassed with 1µF ceramic capacitor - eliminates need for external bias rail in most designs. |
| 8 – AGND | Analog ground reference | Separate from PGND to minimize noise coupling into feedback and error amplifier - essential for stable regulation and low output ripple. |
| 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 compatible logic input - allows direct connection to KL30 battery rail or CAN transceiver INH pin for system-level power sequencing. |
| 11 – SUP | Main supply input | Powers internal LDO (BIAS); bypassed with 4.7µF ceramic capacitor - filters noise from battery source before internal regulation. |
| 12 – SUPSW | Switch supply input | Powers internal high-side/low-side MOSFETs; bypassed with 0.1µF + 4.7µF ceramics - isolates noisy switch node from analog supply. |
| 13–14 – LX | Switching node | Connects to Schottky diode cathode and inductor - high dv/dt node requiring careful layout; automatic slew-rate control minimizes EMI. |
| 15 – PGND | Power ground return | Primary return path for high-current switch and output capacitor - must be low-impedance and separated from AGND at single-point star ground. |
| 16 – PGOOD | Open-drain power-good | Active-low signal asserts when VOUT > 95% of regulation - enables safe power sequencing with microcontrollers and PMICs. |
| EP – Exposed Pad | Thermal pad | Must be connected to PGND plane - provides primary thermal path; contributes ~70% of total heat dissipation in typical layouts. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3.5A high-side + low-side MOSFETs | Eliminates external power switches and reduces BOM count by ≥4 components while maintaining 93% peak efficiency at 2.2MHz. |
| 180° out-of-phase SYNCOUT | Enables two-stage interleaved buck conversion without external timing ICs - cuts input RMS current by ~30% and shrinks input capacitor requirements. |
| Automatic LX slew-rate adjustment | Configures HSFET turn-on time to 4ns (fSW > 1.1MHz) or 8ns (fSW < 1.1MHz) - optimizes EMI vs. efficiency trade-off across full frequency range. |
| AEC-Q100 qualified (-40°C to +125°C) | Validated for automotive under-hood and infotainment applications - meets stress testing requirements for vibration, thermal cycling, and humidity. |
| Spread-spectrum modulation (factory-enabled) | ±6% triangular dither centered on fOSC - reduces peak EMI emissions by 10dB without affecting regulation or transient response. |
Applications
| Automotive Infotainment Head Unit | ADAS Camera Power Supply |
|---|---|
Use Scenario: Powers main SoC, display controller, and audio codec in 12V-based navigation/radio units with strict cold-crank survival requirements. IC Role / Device Role / Timing Role: Primary 5V intermediate rail converter delivering 3.5A with 98% duty cycle capability during engine start. Use Value: Maintains uninterrupted operation during 6V battery dips; PGOOD enables safe SoC reset sequencing; SYNCOUT supports dual-rail camera interface power. |
Use Scenario: Supplies clean 5V to image sensor and ISP in rear-view or surround-view cameras mounted in exterior housings. IC Role / Device Role / Timing Role: High-reliability point-of-load regulator with thermal shutdown and overvoltage protection for safety-critical vision systems. Use Value: AEC-Q100 qualification ensures long-term reliability at +105°C ambient; 28µA IQ extends parking-mode runtime; FPWM mode suppresses switching noise near analog video paths. |
| Industrial Telematics Gateway | Railway Onboard Control Module |
Use Scenario: Provides regulated 5V for LTE modem, GPS receiver, and CAN controller in fleet management gateways operating from 24V truck batteries. IC Role / Device Role / Timing Role: Input-tolerant DC-DC stage accepting wide-range 9–36V input with integrated BIAS LDO for auxiliary circuitry. Use Value: 42V transient tolerance prevents latch-up during load dump; EN pin compatibility with 24V logic enables direct microcontroller control without level shifters. |
Use Scenario: Powers microcontroller and I/O drivers in EN50155-compliant train control units exposed to harsh vibration and wide temperature swings. IC Role / Device Role / Timing Role: Robust 5V supply with thermal shutdown, cycle-by-cycle current limit, and -40°C to +125°C operation. Use Value: Exposed pad and low θJA (35°C/W) ensure stable operation in sealed enclosures; PGOOD simplifies watchdog-based fault recovery sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQWR | 4.5A rated, 3.5V–36V input, 5V fixed output, 15µA IQ, no integrated BIAS LDO, requires external bias supply. | Lacks integrated 5V BIAS rail - increases BOM and layout complexity; better suited for designs already providing auxiliary 5V. | Select when lowest possible quiescent current (15µA) is prioritized over integration; verify external bias availability and sequencing. |
| TPS62933RTER | 3A rated, 3V–36V input, 5V fixed output, 12µA IQ, integrated 5V LDO, but no SYNCOUT or 180° phase output. | Missing cascaded supply capability - unsuitable for multi-phase or interleaved architectures requiring timing coordination. | Choose for space-constrained, ultra-low-IQ applications where single-rail operation suffices and phase synchronization is unnecessary. |
Compared with LM61480RQWR and TPS62933RTER, MAX16935SAUE/V+T uniquely combines AEC-Q100 qualification, integrated BIAS LDO, 180° SYNCOUT, and 98% duty cycle in a single 5mm × 5mm package - making it optimal for automotive multi-rail systems requiring cold-crank resilience and EMI-controlled power delivery.
Availability
MAX16935SAUE/V+T is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial telematics requiring stable component supply, AEC-Q100 compliance, and high-efficiency 5V/3.5A conversion.
Supply support for MAX16935SAUE/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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.
The MAX16935SAUE/V+T belongs to Maxim's automotive-grade power management portfolio, engineered specifically for demanding 12V/24V battery systems requiring cold-crank survival, low quiescent current, and EMI-optimized switching in safety-critical applications.
FAQ
What is the maximum input voltage the MAX16935SAUE/V+T can withstand during load-dump events?
The MAX16935SAUE/V+T supports up to 42V on both SUP and SUPSW pins for ≤1 second during load-dump transients, as specified in the Absolute Maximum Ratings table. This rating is validated per ISO 7637-2 Pulse 5a, enabling direct use in 24V commercial vehicle systems without external TVS clamping in many cases. The device remains functional and undamaged within this limit, provided thermal design accommodates the associated power dissipation.
Does the MAX16935SAUE/V+T require an external Schottky diode, and why?
Yes, the MAX16935SAUE/V+T requires an external Schottky diode connected from LX to AGND. Although it integrates high-side and low-side MOSFETs, the diode improves light-load efficiency by providing a low-loss conduction path during discontinuous conduction mode (DCM) and supports the full 3.5A output current range. The datasheet explicitly states this requirement in the General Description and Pin Descriptions sections, and omitting it risks overvoltage stress on the low-side MOSFET and reduced efficiency.
How does the FSYNC pin control operation mode in the MAX16935SAUE/V+T?
The FSYNC pin selects between skip mode and forced-PWM (FPWM) mode: connecting FSYNC to AGND enables skip mode for minimal quiescent current, while connecting it to BIAS or an external clock forces FPWM operation across all loads. This choice directly impacts EMI profile and light-load efficiency. The MAX16935SAUE/V+T synchronizes to external clocks within one cycle and reverts to internal oscillation if the clock is absent for >2 cycles - ensuring seamless mode transitions without firmware intervention.
What is the purpose of the SYNCOUT pin on the MAX16935SAUE/V+T, and how is it used?
The SYNCOUT pin on the MAX16935SAUE/V+T provides an open-drain 180° out-of-phase clock signal relative to the internal oscillator, enabling cascaded or interleaved power supply configurations. When driving a second identical converter's FSYNC pin through a pull-up resistor, it creates phase-shifted switching that reduces input capacitor RMS current and input ripple. This feature eliminates the need for external timing ICs in dual-rail systems such as automotive displays or multi-sensor modules.
Is the MAX16935SAUE/V+T pin-compatible with other variants in the MAX16935/MAX16939 family?
No, the MAX16935SAUE/V+T is not pin-compatible with MAX16939 variants due to differences in overvoltage protection thresholds and internal configuration. While both share identical pinouts and package (TQFN-EP), the MAX16939 has tighter OVP (105% vs. 107% of VFB) and different skip-mode current thresholds. Substituting without validation risks incorrect fault response in safety-critical applications. Always consult the specific variant's datasheet and confirm electrical behavior matches system requirements before replacement.
MAX16935SAUE/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
MAX16935SAUE/V+T FAQ
1.How can I place an order for MAX16935SAUE/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16935SAUE/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 MAX16935SAUE/V+T reliable?
The price and inventory of MAX16935SAUE/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 MAX16935SAUE/V+T is usually 5 days.
3.What payment methods are accepted for MAX16935SAUE/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16935SAUE/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16935SAUE/V+T?
MAX16935SAUE/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16935SAUE/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 MAX16935SAUE/V+T?
For technical support, including MAX16935SAUE/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16935SAUE/V+T requirements.
6.How does Aetrix verify that MAX16935SAUE/V+T is sourced from the original manufacturer or authorized distributors?
All MAX16935SAUE/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 MAX16935SAUE/V+T meets industry standards.
7.What is the process for return or replacement of MAX16935SAUE/V+T?
All MAX16935SAUE/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16935SAUE/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 MAX16935SAUE/V+T part is unused and in its original packaging.
Return procedure for MAX16935SAUE/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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