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Analog Devices Inc./Maxim Integrated MAX16903SAUE33/V+
- Part No.:
- MAX16903SAUE33/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16903SAUE33/V+.pdf
- Description:
- IC REG BUCK 3.3V 1A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,615
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Product details
Overview
The MAX16903SAUE33/V+ from Maxim Integrated is a synchronous buck DC-DC converter delivering 1A output at fixed 3.3V, operating from +3.5V to +28V input with 25μA quiescent current in skip mode, 2.1MHz switching frequency, and AEC-Q100 qualification for automotive power rails.
For engineers reviewing the MAX16903SAUE33/V+ datasheet, MAX16903SAUE33/V+ pinout, MAX16903SAUE33/V+ application, or MAX16903SAUE33/V+ equivalent, this page provides verified technical context, package mapping, thermal performance data, spread-spectrum EMI reduction capability, and automotive-grade reliability validation - all specific to the 3.3V-output, TSSOP-EP, spread-spectrum-enabled variant.
Technical Context
This device implements current-mode control with integrated high-side (400–800mΩ RDS(ON)) and low-side (250–450mΩ) MOSFETs, enabling dropout operation at 97% duty cycle. It supports three SYNC-configurable modes: forced PWM, skip mode, and external synchronization - each preserving regulation accuracy across -40°C to +125°C.
The MAX16903SAUE33/V+ integrates undervoltage lockout (2.8–3.2V), thermal shutdown (175°C), overcurrent protection (1.275–1.75A), and open-drain PGOOD with 88–98% output voltage threshold detection. Its 80ns minimum on-time and internal soft-start (7–9ms ramp) ensure stable cold-crank startup under automotive transients up to +42V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.0% (fixed-frequency mode), ±3.0% over full temperature range |
| Input Voltage Range | +3.5V to +28V continuous; withstands +42V transients for automotive cold-crank immunity |
| Switching Frequency | 2.1MHz typical (1.925–2.275MHz); spread-spectrum option adds +6% modulation for EMI reduction |
| Quiescent Current | 25μA typical in skip mode; enables compliance with OEM standby current budgets |
| Output Current | 1A continuous; peak current limit 1.275–1.75A with ±15% tolerance for robust short-circuit handling |
| Operating Temperature | -40°C to +125°C ambient; AEC-Q100 qualified for automotive under-hood applications |
| Package | 16-pin TSSOP-EP (5mm × 4.4mm); exposed pad thermally connected to PGND for θJA = 38.3°C/W |
Pinout & Package
MAX16903SAUE33/V+ uses a 16-pin thermally enhanced TSSOP-EP package (5mm × 4.4mm, 0.65mm pitch) with exposed pad soldered to PGND for optimal thermal dissipation. Pin functions are validated per Maxim's official pin configuration diagram and electrical characteristics table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | SUP | Main input supply rail; accepts +3.5V to +28V; requires 4.7µF ceramic capacitor placed adjacent to pins |
| 2, 3 | GND | Analog ground reference; must be connected to PGND only at output capacitor return point |
| 4, 5 | PGND | Power ground for high-current LX switching path; both pins must be tied together and connected to exposed pad |
| 6, 7 | PGOOD | Open-drain power-good signal; asserts high when VOUT ≥ 93% of nominal (3.07V); debounced 10µs |
| 8, 9 | LX | Switch node connecting internal high/low-side FETs to external inductor; requires low-inductance layout |
| 10 | BIAS | +5V internal logic supply; bypassed with 2.2µF ceramic capacitor to GND |
| 11 | SYNC | Mode selection input: grounded → skip mode; driven by BIAS or clock → forced PWM or sync mode |
| 12 | EN | Enable input compatible with +3.3V logic or +42V battery; no internal pullup/pulldown to minimize leakage |
| 13 | OUTS | Voltage feedback sense input; monitors regulated 3.3V output via resistor divider or direct connection |
| 14 | BST | Bootstrap capacitor terminal (0.1µF) for high-side gate drive; critical for >97% duty-cycle dropout operation |
| 16 | N.C. | No internal connection; left unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | High-side and low-side DMOS FETs eliminate external MOSFETs and gate drivers, reducing BOM count and board area |
| Spread-Spectrum Modulation | +6% frequency dithering reduces peak radiated EMI without compromising AM-band immunity (≥1.8MHz) |
| Automotive Transient Tolerance | Withstands +42V input transients and operates down to +3.5V, meeting ISO 7637-2 pulse 4 and cold-crank requirements |
| Three-Mode Operation Control | Skip mode (25μA IQ), forced PWM (constant 2.1MHz), and external sync enable flexible EMI/efficiency trade-off |
| Thermal Protection | 175°C junction shutdown with 15°C hysteresis ensures reliable operation during overload or poor heatsinking |
Applications
| Automotive Body Control Module (BCM) | Automotive Infotainment Power Rail |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface in door module under battery voltage fluctuations from 6V to 16V. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator providing stable, low-noise supply with PGOOD monitoring for system reset coordination. Use Value: 25μA quiescent current extends battery life during vehicle sleep mode; +42V transient tolerance prevents brownout during load dump. |
Use Scenario: Supplies 3.3V to display controller and audio codec in head unit where EMI must avoid FM radio band interference. IC Role / Device Role / Timing Role: Fixed-frequency 2.1MHz buck converter with optional spread-spectrum modulation to suppress narrowband emissions. Use Value: Spread-spectrum operation reduces peak radiated EMI by >10dB while maintaining AM-band clearance (≥1.8MHz). |
| Industrial Telematics Gateway | Railway Onboard Controller |
Use Scenario: Converts wide-range 9–36V DC input to 3.3V for LTE modem and GPS receiver in fleet management hardware. IC Role / Device Role / Timing Role: High-voltage-input buck regulator with SYNC pin enabling synchronization to system clock to avoid beat frequencies. Use Value: External clock sync eliminates heterodyne noise in sensitive RF sections; AEC-Q100 qualification ensures reliability in mobile industrial environments. |
Use Scenario: Provides 3.3V bias for safety-critical I/O and communication ICs in train control electronics subjected to EN 50155 vibration and temperature extremes. IC Role / Device Role / Timing Role: Automotive-grade buck converter operating continuously at -40°C to +125°C with thermal shutdown and overcurrent protection. Use Value: Junction temperature monitoring and 175°C shutdown prevent thermal runaway in sealed enclosures with limited airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMQ66430QRGTRQ1 | 3.0V to 36V input, 3A output, 2.1MHz, no spread-spectrum, QFN-16 package | Higher output current; lacks spread-spectrum EMI reduction; different pinout and compensation scheme | Select when >1A load or smaller solution size is required; re-evaluate loop stability and thermal layout |
| TPS62933RTER | 3.0V to 18V input, 3.3V/3A output, 1.8MHz, integrated ferrite-bead filter, no AEC-Q100 | Lower max input voltage; includes EMI filter; not automotive-qualified; different enable and PGOOD thresholds | Choose for non-automotive industrial use where ultra-low EMI is prioritized over transient tolerance |
Compared with LM66430QRGTRQ1 and TPS62933RTER, the MAX16903SAUE33/V+ uniquely combines AEC-Q100 qualification, +42V transient tolerance, spread-spectrum EMI control, and 25μA skip-mode IQ - making it the only option validated for automotive body electronics requiring simultaneous low-IQ, high-reliability, and regulatory-compliant emissions.
Availability
MAX16903SAUE33/V+ is available at Aetrix Electronics and suitable for automotive body control modules, infotainment systems, and industrial telematics gateways requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX16903SAUE33/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 MAX16903 product line delivers high-voltage, low-quiescent-current buck converters optimized for automotive power rails - specifically engineered to meet AEC-Q100, cold-crank, and EMI requirements in space-constrained ECUs.
FAQ
What is the output voltage tolerance of the MAX16903SAUE33/V+ over temperature and load?
The MAX16903SAUE33/V+ delivers 3.3V output with ±2.0% accuracy under fixed-frequency operation (6V ≤ VSUP ≤ 18V, ILOAD = 0–1A, TA = 0°C to +125°C). Over the full automotive range (-40°C to +125°C), tolerance widens to ±3.0%. In skip mode, accuracy is ±4.0% maximum. These values are measured and guaranteed per Maxim's Electrical Characteristics table.
Does the MAX16903SAUE33/V+ support external synchronization, and what is the valid frequency range?
Yes, the MAX16903SAUE33/V+ supports external synchronization via its SYNC pin. The valid input frequency range is 1.8MHz to 2.6MHz. When SYNC is driven by an external clock within this band, the device enters forced PWM mode and locks to the applied frequency - enabling deterministic EMI management and elimination of beat frequencies in multi-rail systems.
How does the spread-spectrum feature work in the MAX16903SAUE33/V+, and is it enabled by default?
The spread-spectrum feature in the MAX16903SAUE33/V+ modulates the internal 2.1MHz oscillator frequency by +6% (i.e., up to 2.226MHz) to reduce peak radiated emissions. It is enabled by the "S" prefix in the part number (MAX16903SAUE33/V+), meaning this specific variant ships with spread-spectrum active. No external configuration is needed - the modulation is internal and automatic when operating in internally generated frequency mode.
What is the thermal resistance (θJA) of the MAX16903SAUE33/V+ in its TSSOP-EP package?
The MAX16903SAUE33/V+ in the 16-pin TSSOP-EP package has a junction-to-ambient thermal resistance (θJA) of 38.3°C/W, measured per JEDEC JESD51-7 on a four-layer board. This value assumes proper thermal design: exposed pad soldered to PGND plane with multiple vias, and adequate copper area. Derating is 26.1 mW/°C above +70°C ambient.
Can the MAX16903SAUE33/V+ operate in dropout, and what is the minimum input voltage for 3.3V output?
Yes, the MAX16903SAUE33/V+ supports dropout operation by achieving up to 97% duty cycle, allowing regulation down to VIN ≈ 3.4V for 3.3V output. However, the absolute minimum specified input voltage is +3.5V per datasheet - below which UVLO (2.8–3.2V threshold) disables operation. Dropout behavior is confirmed in the "Extended Input Voltage Range" section and validated in cold-crank waveforms.
MAX16903SAUE33/V+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
MAX16903SAUE33/V+ FAQ
1.How can I place an order for MAX16903SAUE33/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16903SAUE33/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 MAX16903SAUE33/V+ reliable?
The price and inventory of MAX16903SAUE33/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16903SAUE33/V+ is usually 5 days.
3.What payment methods are accepted for MAX16903SAUE33/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16903SAUE33/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16903SAUE33/V+?
MAX16903SAUE33/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16903SAUE33/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 MAX16903SAUE33/V+?
For technical support, including MAX16903SAUE33/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16903SAUE33/V+ requirements.
6.How does Aetrix verify that MAX16903SAUE33/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16903SAUE33/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 MAX16903SAUE33/V+ meets industry standards.
7.What is the process for return or replacement of MAX16903SAUE33/V+?
All MAX16903SAUE33/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16903SAUE33/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 MAX16903SAUE33/V+ part is unused and in its original packaging.
Return procedure for MAX16903SAUE33/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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