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Analog Devices Inc./Maxim Integrated MAX16903RAUE33+
- Part No.:
- MAX16903RAUE33+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16903RAUE33+.pdf
- Description:
- IC REG BUCK 3.3V 1A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,323
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Product details
Overview
The MAX16903RAUE33+ 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. It integrates high-side and low-side MOSFETs, features PGOOD monitoring, 2.1MHz switching, and AEC-Q100 qualification for automotive power rail generation.
For engineers reviewing the MAX16903RAUE33+ datasheet, MAX16903RAUE33+ pinout, MAX16903RAUE33+ application, or MAX16903RAUE33+ equivalent, this page provides verified technical context, validated package mapping (16-pin TSSOP-EP), confirmed pin functions, real-world EMI mitigation methods (spread-spectrum option available), and two production-validated alternative parts for 3.3V automotive buck conversion.
Technical Context
The MAX16903RAUE33+ implements current-mode control with internal slope compensation and no external compensation required. Its 80ns minimum on-time enables stable operation up to 18V input while maintaining regulation, and dropout operation at >97% duty cycle ensures functionality during cold-crank transients down to 3.5V.
SYNC pin logic determines operational mode: grounded/unconnected enables skip mode (25μA IQ); driven by BIAS or external clock forces fixed-frequency PWM (2.1MHz ±6.25%). PGOOD asserts high when VOUT exceeds 93% of nominal (3.3V), with 10μs debounce and open-drain output requiring external pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.5% over -40°C to +125°C, 0–1A load, 6–18V input |
| Input Voltage Range | +3.5V to +28V continuous; withstands +42V transients for automotive cold-crank survival |
| Switching Frequency | 2.1MHz typical; supports forced PWM, skip mode, and external sync - avoids AM band (1.8–2.6MHz range) |
| Quiescent Current | 25μA typical in skip mode at no load - meets OEM standby current budgets |
| Output Current | 1A continuous; peak current limit 1.5A ±15% with automatic hiccup restart on short circuit |
| Thermal Protection | 175°C junction shutdown with 15°C hysteresis - ensures reliability in under-hood environments |
| Package | 16-pin TSSOP-EP (5mm × 4.4mm) with exposed pad soldered to PGND for θJA = 38.3°C/W |
Pinout & Package
MAX16903RAUE33+ uses a thermally enhanced 16-pin TSSOP-EP package (5mm × 4.4mm, 0.65mm pitch) with exposed pad connected to PGND. The EP improves thermal performance and must be soldered to a dedicated PGND copper plane using multiple vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | SUP | Main input supply (3.5–28V); requires 4.7µF ceramic capacitor placed adjacent to pins |
| 3, 4 | LX | Switch node connecting integrated high/low-side FETs; ties to external inductor (3.3µH typical) |
| 5, 6 | PGND | Power ground return for LX and output capacitor; must connect to EP and external PGND plane |
| 7 | OUTS | Voltage feedback sense input; connects to output capacitor (≥10µF X7R) for regulation |
| 8 | PGOOD | Open-drain power-good signal; pulls low if VOUT < 91% of 3.3V (3.003V) |
| 9, 10 | PGND | Secondary power ground pins - must be tied together and to primary PGND/EP |
| 11 | SYNC | Mode control: GND/unconnected = skip mode; BIAS or clock = forced PWM or sync |
| 12 | BIAS | +5V internal LDO output; powers internal logic; bypass with 2.2µF ceramic to GND |
| 13 | GND | Analog ground reference; connect to PGND only at output capacitor return point |
| 14, 15 | SUP | Duplicate SUP pins - must be shorted externally for proper operation |
| 16 | EN | Enable input compatible from 3.3V logic up to +42V; no internal pullup/pulldown |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Validated for automotive applications across -40°C to +125°C junction temperature |
| Integrated FETs | High-side RDS(ON) = 400–800mΩ and low-side RDS(ON) = 250–450mΩ reduce BOM count and layout area |
| Spread-spectrum option | Available as MAX16903SAUE33+; ±6% frequency modulation reduces peak EMI emissions without affecting SYNC sync capability |
| Dropout operation | Maintains regulation at >97% duty cycle - critical for automotive battery sag below 6V |
| PGOOD with debounce | 10µs debounced open-drain output enables reliable system power sequencing and fault detection |
Applications
| Infotainment Power Supply | ADAS Camera Module |
|---|---|
|
Use Scenario: Powers 3.3V digital logic (SoC I/O, SerDes, memory interfaces) in head-unit systems with wide battery voltage variation. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator providing clean, sequenced, and monitored power to infotainment subsystems. Use Value: 25μA quiescent current extends battery life during vehicle sleep mode; PGOOD enables safe MCU wake-up sequencing. |
Use Scenario: Supplies 3.3V to image sensor interface and ISP in forward-facing ADAS cameras exposed to under-hood temperatures. IC Role / Device Role / Timing Role: High-reliability DC-DC converter delivering regulated 3.3V with thermal shutdown and overcurrent protection. Use Value: AEC-Q100 qualification and -40°C to +125°C operation ensure functional safety compliance; 2.1MHz switching minimizes EMI near sensitive analog video paths. |
| Body Control Module (BCM) | Automotive Telematics Unit |
|
Use Scenario: Generates 3.3V for microcontroller peripherals (CAN transceivers, LIN, EEPROM) in centralized body electronics. IC Role / Device Role / Timing Role: Input-tolerant buck regulator handling load-dump and cold-crank transients while maintaining output stability. Use Value: +42V transient tolerance and UVLO hysteresis prevent brownout resets during engine cranking; EN pin supports KEY-off power gating. |
Use Scenario: Powers 3.3V domain of cellular modem, GNSS receiver, and secure element in telematics control units. IC Role / Device Role / Timing Role: Low-noise, spread-spectrum-capable buck converter meeting automotive EMC requirements for wireless modules. Use Value: Optional spread-spectrum mode (MAX16903SAUE33+) reduces radiated emissions near RF antennas without compromising sync capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3.3V synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QWRNXTQ1 | 3.3V fixed output; 3.5–36V input; 1.2A output; 2.1MHz; QFN-16; AEC-Q100 | Higher max input (36V) and output current (1.2A); no spread-spectrum option; different pinout | Select for higher input margin or increased current headroom; verify PCB layout compatibility due to non-pin-compatible footprint |
| TPS62933QWRVYTQ1 | 3.3V fixed output; 3–18V input; 3A output; 2.25MHz; VQFN-16; AEC-Q100; integrated ferrite-bead filter | Narrower input range (no cold-crank support below 3.5V); higher current; includes EMI filter; different enable threshold | Select when EMI filtering is prioritized over cold-crank operation; not suitable for 28V battery systems or +42V transients |
Compared with LM61480QWRNXTQ1 and TPS62933QWRVYTQ1, the MAX16903RAUE33+ uniquely balances cold-crank survivability (+3.5V min), +42V transient tolerance, ultra-low 25μA skip-mode IQ, and optional spread-spectrum EMI reduction - making it optimal for cost-sensitive, space-constrained 1A automotive rails where input voltage extremes dominate design constraints.
Availability
MAX16903RAUE33+ is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and body control units requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX16903RAUE33+ 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 belongs to Maxim's automotive-grade power management portfolio, engineered specifically for high-voltage DC-DC conversion in harsh environments - emphasizing cold-crank operation, transient robustness, and AEC-Q100 reliability.
FAQ
What is the output voltage tolerance of the MAX16903RAUE33+ over temperature and load?
The MAX16903RAUE33+ delivers 3.3V output with ±2.5% accuracy across -40°C to +125°C junction temperature and 0–1A load, measured at 6–18V input. At full temperature range (-40°C to +125°C), the specification tightens to -3.0% to +2.5%, ensuring stable power for automotive microcontrollers and sensors under all operating conditions. This tolerance is guaranteed by production testing, not just design simulation.
Does the MAX16903RAUE33+ support synchronization to an external clock source?
Yes, the MAX16903RAUE33+ supports external clock synchronization via its SYNC pin. When driven by a clock signal between 1.8MHz and 2.6MHz, the device locks to that frequency and operates in forced PWM mode. This capability enables EMI reduction through frequency dithering across multiple synchronized converters and eliminates beat frequencies in multi-rail systems - a key requirement in modern automotive ECUs.
How does the MAX16903RAUE33+ handle automotive cold-crank conditions?
The MAX16903RAUE33+ sustains regulation down to +3.5V input and tolerates transients up to +42V - directly addressing cold-crank (battery sag to ~3.5V) and load-dump (spikes to 42V) events. Its ability to operate at >97% duty cycle maintains 3.3V output even during deep battery sag, while the 0.4V EN threshold hysteresis and internal UVLO (2.8–3.2V) prevent erratic startup. These features are validated per AEC-Q100 stress test conditions.
What thermal performance can be expected from the MAX16903RAUE33+ in a standard 4-layer PCB?
In a JEDEC-standard 4-layer board per JESD51-7, the MAX16903RAUE33+ (16-pin TSSOP-EP) achieves θJA = 38.3°C/W and θJC = 3°C/W. At 1A load and +70°C ambient, junction temperature rise is ~38°C - well below the 175°C shutdown threshold. Proper EP soldering to a large PGND plane with ≥6 thermal vias is mandatory to achieve these values; insufficient thermal relief increases θJA by >15°C.
Is spread-spectrum modulation available on the MAX16903RAUE33+?
No - spread-spectrum modulation is not enabled on the MAX16903RAUE33+. It is only available on parts with "S" prefix (e.g., MAX16903SAUE33+). The "R" prefix indicates standard frequency operation. However, the MAX16903RAUE33+ retains full SYNC functionality: it can still synchronize to external clocks or operate in skip/forced-PWM modes - preserving EMI control flexibility without built-in frequency dithering.
MAX16903RAUE33+ 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
MAX16903RAUE33+ FAQ
1.How can I place an order for MAX16903RAUE33+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16903RAUE33+ 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 MAX16903RAUE33+ reliable?
The price and inventory of MAX16903RAUE33+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16903RAUE33+ is usually 5 days.
3.What payment methods are accepted for MAX16903RAUE33+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16903RAUE33+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16903RAUE33+?
MAX16903RAUE33+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16903RAUE33+ 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 MAX16903RAUE33+?
For technical support, including MAX16903RAUE33+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16903RAUE33+ requirements.
6.How does Aetrix verify that MAX16903RAUE33+ is sourced from the original manufacturer or authorized distributors?
All MAX16903RAUE33+ 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 MAX16903RAUE33+ meets industry standards.
7.What is the process for return or replacement of MAX16903RAUE33+?
All MAX16903RAUE33+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16903RAUE33+, 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 MAX16903RAUE33+ part is unused and in its original packaging.
Return procedure for MAX16903RAUE33+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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