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Analog Devices Inc./Maxim Integrated MAX16903SAUE33+
- Part No.:
- MAX16903SAUE33+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16903SAUE33+.pdf
- Description:
- IC REG BUCK 3.3V 1A 16TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
The MAX16903SAUE33+ from Maxim Integrated is a synchronous buck DC-DC converter delivering 1A output at fixed 3.3V with integrated high-side and low-side MOSFETs, operating from +3.5V to +28V input and tolerating +42V transients. It features 2.1MHz switching frequency, 25μA quiescent current in skip mode, PGOOD monitoring, and AEC-Q100 qualification for automotive power rail generation.
For engineers reviewing the MAX16903SAUE33+ datasheet, MAX16903SAUE33+ pinout, MAX16903SAUE33+ application, or MAX16903SAUE33+ equivalent, this page provides verified technical context, package-specific pin functions, real-world automotive/industrial use cases, and validated alternative options - all grounded in official Maxim documentation and electrical specifications.
Technical Context
The MAX16903SAUE33+ implements current-mode control with internal soft-start (8ms typical), undervoltage lockout (3.0V threshold), and thermal shutdown at 175°C. Its 80ns minimum on-time enables stable operation across wide input ranges, including cold-crank conditions down to +3.5V.
It supports three operational modes via the SYNC pin: skip mode (25μA IQ), forced fixed-frequency PWM, and external clock synchronization (1.8–2.6MHz). Spread-spectrum modulation (+6% frequency dither) is enabled on this variant to reduce EMI emissions without compromising AM-band immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.5% over -40°C to +125°C, enabling direct replacement of LDOs in noise-sensitive digital rails. |
| Input Voltage Range | +3.5V to +28V continuous, with +42V transient tolerance - supports automotive battery systems during cranking and load-dump events. |
| Switching Frequency | 2.1MHz typical (1.925–2.275MHz), allowing compact 3.3µH inductor and low-ESR ceramic capacitors while avoiding AM radio band interference. |
| Quiescent Current | 25μA typical in skip mode, meeting OEM requirements for always-on vehicle modules like body control units and infotainment standby supplies. |
| Output Current | 1A continuous, with peak current limit set at 1.5A (±15%) and short-circuit protection enabling robust operation under fault conditions. |
| Thermal Range | -40°C to +125°C ambient, AEC-Q100 qualified, with junction-to-case thermal resistance of 3°C/W in TSSOP-EP package for high-power-density designs. |
| PGOOD Threshold | Active-high open-drain output asserting when VOUT exceeds 93% of nominal (3.07V) and deasserting below 91% (3.00V), providing reliable system power sequencing feedback. |
Pinout & Package
MAX16903SAUE33+ uses a 16-pin thermally enhanced TSSOP-EP package (5mm × 4.4mm, exposed pad), optimized for automotive PCB layouts requiring high thermal performance and EMI resilience.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | SUP | Main input supply pin; accepts +3.5V to +28V; requires 4.7µF ceramic capacitor placed adjacent to minimize high-frequency ripple. |
| 3, 4 | LX | Switching node connecting to external inductor; must be routed with minimal loop area to reduce EMI and voltage spikes. |
| 5, 6 | PGND | Power ground return for high-current paths; tied directly to exposed pad and output capacitor negative terminal for optimal thermal and electrical performance. |
| 7 | OUTS | Voltage sense input; monitors regulated 3.3V output via internal resistive divider; bypassed with ≥10µF X7R ceramic capacitor to PGND. |
| 8 | PGOOD | Open-drain power-good indicator; pulled up externally (e.g., 20kΩ to BIAS) to signal valid regulation status to host controller or sequencer. |
| 9, 10 | SUP | Second SUP connection; electrically identical to pins 1–2 and must be connected together for proper operation. |
| 11 | SYNC | Mode selection input; grounded or floating enables skip mode; driven by BIAS or external clock forces fixed-frequency PWM or synchronization. |
| 12 | BIAS | +5V internal logic supply; requires 2.2µF ceramic capacitor to GND to stabilize internal bias generator and UVLO circuitry. |
| 13 | GND | Analog ground reference; isolated from PGND except at single-point connection near output capacitor to prevent noise coupling. |
| 14 | EN | Enable input compatible with +3.3V logic or +42V automotive signals; no internal pullup/pulldown ensures ultra-low standby leakage. |
| 15 | BST | Bootstrap capacitor terminal (0.1µF); supplies gate drive voltage for high-side FET; critical for maintaining >97% duty cycle in dropout operation. |
| 16 | N.C. | No internal connection; left unconnected per datasheet guidance to avoid parasitic coupling or layout complications. |
| EP | Exposed Pad | Thermal and electrical ground; soldered to large copper plane connected to PGND for efficient heat dissipation and reduced θJA (38.3°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | High-side and low-side DMOS FETs (RON,HS = 400–800mΩ, RON,LS = 250–450mΩ) eliminate external MOSFETs and gate drivers, reducing BOM count and layout complexity. |
| Spread-Spectrum Modulation | +6% frequency dither applied only during internally generated switching (not during SYNC-synchronized operation), lowering peak EMI emissions without affecting timing stability. |
| Dropout Operation | Maintains regulation at >97% duty cycle with 150kHz effective switching during deep dropout, enabling uninterrupted 3.3V output even during +3.5V cold-crank events. |
| Ultra-Low Quiescent Current | 25μA in skip mode and <1μA in shutdown, supporting ISO 16750-2 Class D (100μA max) requirements for always-on automotive ECUs. |
| Robust Protection Suite | Includes overcurrent limiting (1.5A typ), thermal shutdown (175°C), PGOOD monitoring, and ±2kV HBM ESD rating - eliminating need for external protection components. |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Hub Power Supply |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and I/O drivers in vehicle door modules during start-stop cycles and cold-crank conditions. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator supplying core logic and communication interfaces with PGOOD sequencing and transient immunity. Use Value: Maintains regulation down to +3.5V input and survives +42V load-dump transients, eliminating need for upstream TVS or pre-regulator stages. |
Use Scenario: Supplies 3.3V to MEMS accelerometers, temperature sensors, and wireless SoCs in factory-floor condition-monitoring nodes. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter enabling multi-year battery life in wireless sensor networks via 25μA skip-mode IQ. Use Value: Reduces average power consumption by >60% vs. fixed-frequency operation under light loads (<10mA), extending battery runtime significantly. |
| Automotive Infotainment Display Backlight Driver | Rail Generator for ADAS Camera Modules |
Use Scenario: Generates stable 3.3V for display controller ICs and touch interface processors in head-unit systems subject to wide battery voltage swings. IC Role / Device Role / Timing Role: Secondary power rail generator with fast transient response (<200µs recovery) and low output ripple for noise-sensitive video processing circuits. Use Value: Achieves <200mVpp output ripple with 10µF ceramic output cap due to 2.1MHz switching, preventing visual artifacts in LCD/TFT displays. |
Use Scenario: Provides clean 3.3V supply to image signal processors and high-speed serial interfaces (e.g., MIPI CSI-2) in automotive camera ECU designs. IC Role / Device Role / Timing Role: Low-noise, spread-spectrum-enabled buck converter minimizing radiated emissions near RF-sensitive camera front-end circuits. Use Value: Passes CISPR 25 Class 5 conducted and radiated EMI tests without additional filtering, simplifying EMC validation for ADAS systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16903RAUE33+ | No spread-spectrum modulation; otherwise identical pinout, electrical specs, and thermal performance. | Lacks EMI reduction benefit; suitable where board-level filtering suffices and cost sensitivity outweighs EMI margin needs. | Select MAX16903RAUE33+ only if spread-spectrum is unnecessary and lower unit cost is prioritized over radiated emissions compliance. |
| LM61480QWRNXTQ1 | 4.5–36V input, 3.3V/3A output, 2.1MHz switching, but lacks SYNC programmability and spread-spectrum option. | Higher output current capability; intended for more demanding loads but requires larger external components and offers less flexible light-load efficiency tuning. | Choose LM61480QWRNXTQ1 when >1A output is required and spread-spectrum is not mandated; verify thermal design with its higher RθJA (45°C/W). |
Compared with MAX16903RAUE33+, the MAX16903SAUE33+ adds spread-spectrum modulation for EMI reduction without changing footprint or basic functionality; compared with LM61480QWRNXTQ1, it trades higher current capacity for tighter integration, smaller solution size, and superior light-load IQ performance.
Availability
MAX16903SAUE33+ is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor hubs, ADAS camera power supplies, and infotainment display subsystems requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX16903SAUE33+ 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 MAX16903 product line delivers compact, AEC-Q100-qualified buck converters targeting automotive power rails where input transients, thermal constraints, and EMI compliance are critical design factors.
FAQ
What is the output voltage accuracy of the MAX16903SAUE33+ over temperature and load?
The MAX16903SAUE33+ maintains 3.3V output within ±2.5% over -40°C to +125°C ambient temperature and 0–1A load range in fixed-frequency mode. In skip mode, accuracy is ±4% across the same conditions. This is guaranteed by design and confirmed in the Electrical Characteristics table of the official datasheet.
Does the MAX16903SAUE33+ require external compensation components?
No, the MAX16903SAUE33+ uses internal current-mode control with fixed compensation, eliminating the need for external RC networks. This simplifies design and improves reliability - a key advantage over voltage-mode buck controllers that require careful loop compensation.
How does the MAX16903SAUE33+ handle input voltage transients up to +42V?
The MAX16903SAUE33+ withstands +42V transients on the SUP pin for <1 second without damage or latch-up, thanks to robust internal protection circuitry. Its absolute maximum rating for SUP is +42V, and it continues regulating 3.3V output during shorter transients common in automotive load-dump scenarios.
What is the purpose of the BST pin on the MAX16903SAUE33+?
The BST pin on the MAX16903SAUE33+ connects to a 0.1µF bootstrap capacitor that supplies gate drive voltage to the high-side MOSFET. This enables >97% duty cycle operation during dropout, ensuring uninterrupted 3.3V output even when input drops to +3.5V - critical for automotive cold-crank robustness.
Is the MAX16903SAUE33+ pin-compatible with other variants in the MAX16903 family?
Yes, the MAX16903SAUE33+ shares identical 16-pin TSSOP-EP pinout and footprint with all RAUE/SATB/SAUE variants, including MAX16903RAUE33+, MAX16903SATB33+, and MAX16903RAUE50+. This allows drop-in replacement for different output voltages or spread-spectrum configurations without PCB redesign.
MAX16903SAUE33+ 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+ FAQ
1.How can I place an order for MAX16903SAUE33+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16903SAUE33+ 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+ reliable?
The price and inventory of MAX16903SAUE33+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16903SAUE33+ is usually 5 days.
3.What payment methods are accepted for MAX16903SAUE33+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16903SAUE33+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16903SAUE33+?
MAX16903SAUE33+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16903SAUE33+ 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+?
For technical support, including MAX16903SAUE33+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16903SAUE33+ requirements.
6.How does Aetrix verify that MAX16903SAUE33+ is sourced from the original manufacturer or authorized distributors?
All MAX16903SAUE33+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX16903SAUE33+?
All MAX16903SAUE33+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16903SAUE33+, 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+ part is unused and in its original packaging.
Return procedure for MAX16903SAUE33+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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