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Analog Devices Inc./Maxim Integrated MAX16903SAUE33/V+T
- Part No.:
- MAX16903SAUE33/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16903SAUE33/V+T.pdf
- Description:
- IC REG BUCK 3.3V 1A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,862
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Product details
Overview
MAX16903SAUE33/V+T from Maxim Integrated is a synchronous buck DC-DC converter IC delivering 1A output at fixed 3.3V with integrated high-side and low-side MOSFETs, 2.1MHz switching frequency, 25μA quiescent current in skip mode, and operation across +3.5V to +28V input - designed for automotive cold-crank power rails in engine control units and ADAS camera modules.
For engineers reviewing the MAX16903SAUE33/V+T datasheet, MAX16903SAUE33/V+T pinout, MAX16903SAUE33/V+T application, or MAX16903SAUE33/V+T equivalent, key selection criteria include AEC-Q100 qualification, spread-spectrum EMI reduction, -40°C to +125°C operation, 16-pin TSSOP-EP package with exposed pad, and compatibility with 3.3V logic enable signaling up to +42V.
Technical Context
The MAX16903SAUE33/V+T implements current-mode control with internal soft-start (8ms ramp), undervoltage lockout (3.0V typ), and thermal shutdown at 175°C. It supports three SYNC-configurable modes: skip mode (25μA IQ), forced PWM (fixed 2.1MHz), and external synchronization (1.8–2.6MHz).
Its architecture enables dropout operation at >97% duty cycle, tolerates +42V transients, and integrates bootstrap (BST), power ground (PGND), and analog ground (GND) separation for noise immunity. The spread-spectrum option modulates frequency by +6% only above 2.1MHz to avoid AM band interference while preserving minimum on-time compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.5% over full load/temperature range - ensures stable supply for automotive microcontrollers and image sensors. |
| Input Voltage Range | +3.5V to +28V, with +42V transient tolerance - supports 12V/24V automotive battery systems including cold-crank down to 3.5V. |
| Switching Frequency | 2.1MHz typical, programmable via SYNC pin - enables use of compact 3.3µH inductor and reduces output ripple without AM band interference. |
| Quiescent Current | 25μA in skip mode at no load - meets OEM standby current budgets for always-on vehicle networks. |
| Output Current | 1A continuous, with peak current limit at 1.5A (±15%) - provides headroom for transient loads in infotainment and telematics subsystems. |
| Thermal Range | -40°C to +125°C junction temperature - qualified per AEC-Q100 Grade 0 for under-hood and front-end automotive placement. |
| EMI Reduction | Optional spread-spectrum modulation (+6% offset) - lowers radiated emissions without requiring external filtering components. |
Pinout & Package
MAX16903SAUE33/V+T uses a 16-pin thermally enhanced TSSOP-EP package (5mm × 4.4mm, 0.65mm pitch) with exposed pad soldered to PGND for improved thermal performance (θJA = 38.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | SUP | High-voltage input supply (3.5–28V); requires 4.7µF ceramic capacitor placed adjacent to pins for stable operation. |
| 3, 4 | LX | Switching node connecting to external inductor; dual pins must be shorted externally for proper current sharing. |
| 5, 6 | PGND | Power ground return for high-current paths; dual pins must be shorted and connected to exposed pad. |
| 7 | OUTS | Voltage feedback sense input; bypassed with ≥10µF X7R ceramic capacitor to PGND for regulation stability. |
| 8 | PGOOD | Open-drain power-good signal active high when output is within 91–93% of nominal - used for system sequencing and fault detection. |
| 9, 10 | SYNC | Mode-select input: grounded/unconnected enables skip mode; driven by BIAS or external clock forces PWM operation. |
| 11 | BIAS | +5V internal LDO output; requires 2.2µF ceramic capacitor to GND for internal logic bias stability. |
| 12 | GND | Analog ground reference; must connect to PGND only at output capacitor return point to avoid noise coupling. |
| 13 | EN | Enable input compatible with 3.3V logic up to +42V; no internal pullup/pulldown minimizes leakage current. |
| 14, 15 | BST | Bootstrap capacitor connection (0.1µF) for high-side gate drive - critical for maintaining >97% duty cycle in dropout. |
| 16 | EP | Exposed thermal pad; must be soldered to PGND plane with multiple vias for thermal dissipation and EMI shielding. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Grade 0 (-40°C to +125°C) qualification ensures reliability for automotive safety-critical power rails. |
| Integrated Power FETs | High-side RDS(ON) = 400–800mΩ and low-side RDS(ON) = 250–450mΩ eliminate external MOSFETs and reduce BOM count. |
| Three-Mode Operation | Skip mode (25μA IQ), forced PWM (2.1MHz fixed), and external sync (1.8–2.6MHz) optimize efficiency vs. EMI trade-offs per system requirement. |
| Spread-Spectrum Option | +6% frequency modulation reduces peak EMI emissions without compromising minimum on-time or AM band compliance. |
| Robust Transient Handling | Tolerates +42V input transients and maintains regulation during cold-crank (down to 3.5V), enabling direct battery connection. |
Applications
| Automotive Engine Control Unit (ECU) | ADAS Camera Module Power |
|---|---|
Use Scenario: Powers 32-bit microcontroller and CAN transceiver in under-hood ECU exposed to wide temperature swings and battery transients. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator providing clean, sequenced, and monitored power with PGOOD assertion before MCU boot. Use Value: AEC-Q100 qualification and -40°C to +125°C operation ensure functional safety compliance; 25μA skip-mode IQ extends battery life during vehicle sleep states. | Use Scenario: Supplies image sensor and ISP in forward-facing camera module requiring low-noise, fast-transient response power. IC Role / Device Role / Timing Role: Fixed 3.3V synchronous buck converter with <200µs load-step recovery and <200mV droop - critical for pixel clock stability. Use Value: 2.1MHz switching enables small 3.3µH inductor and low-ESR ceramic output caps; spread-spectrum reduces EMI that could corrupt image data lines. |
| Telematics Control Unit (TCU) | Automotive Infotainment Head Unit |
Use Scenario: Powers LTE modem and GNSS receiver in always-connected TCU where low standby current and thermal resilience are mandatory. IC Role / Device Role / Timing Role: High-efficiency 3.3V regulator with EN-controlled sequencing and PGOOD monitoring for modem power-up coordination. Use Value: 25μA quiescent current meets OEM "parking mode" requirements; +42V transient tolerance prevents reset during jump-start events. | Use Scenario: Delivers 3.3V rail to audio DSP and display interface in center-stack infotainment unit subject to vibration and thermal cycling. IC Role / Device Role / Timing Role: Compact, thermally robust buck converter using TSSOP-EP package with exposed pad for conduction cooling in space-constrained PCB layout. Use Value: θJA = 38.3°C/W and exposed-pad thermal design allow 1A continuous output without heatsink; 16-pin TSSOP simplifies automated assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMQ61460QRWRQ1 | 3.3V fixed output, 6A rating, 2.1MHz, AEC-Q100 Grade 1; larger 16-pin WQFN (3mm × 2.5mm) | Higher current capability suits multi-rail systems; lacks spread-spectrum option but offers adjustable frequency and PMBus interface | Select when >1A load margin or digital configuration is required; not drop-in due to different pinout and footprint |
| TPS62933QPWPRQ1 | 3.3V fixed output, 3A rating, 2.25MHz, AEC-Q100 Grade 0; 12-pin VQFN (2mm × 3mm) with integrated inductor option | Smaller footprint and higher efficiency at light loads; no spread-spectrum but includes DCS-Control topology for faster transient response | Prefer for space-constrained designs needing <3A; verify PGOOD timing compatibility with host processor reset requirements |
Compared with LM61460QRWRQ1 and TPS62933QPWPRQ1, the MAX16903SAUE33/V+T offers unique spread-spectrum EMI reduction and optimized 1A performance in a mature, production-proven TSSOP-EP package - making it ideal for cost-sensitive, volume automotive applications where board-level EMI filtering must be minimized.
Availability
MAX16903SAUE33/V+T is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, telematics control units, and infotainment head units requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX16903SAUE33/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, 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 specifically engineered for automotive power rails - emphasizing AEC-Q100 reliability, cold-crank operation, and EMI-compliant switching in compact packages.
FAQ
What is the output voltage accuracy of the MAX16903SAUE33/V+T over temperature and load?
The MAX16903SAUE33/V+T delivers 3.3V output with ±2.5% accuracy across -40°C to +125°C junction temperature and 0–1A load range in fixed-frequency mode. In skip mode, accuracy degrades to ±4% - verified per Electrical Characteristics table on page 3 of the datasheet. This ensures reliable operation for automotive microcontrollers and sensors requiring tight voltage margins.
Does the MAX16903SAUE33/V+T support external synchronization, and what is the valid frequency range?
Yes, the MAX16903SAUE33/V+T supports external synchronization via the SYNC pin, accepting input frequencies from 1.8MHz to 2.6MHz. When SYNC is driven by an external clock source or tied to BIAS, the device operates in forced PWM mode. This allows precise timing alignment with other system supplies to minimize beat frequencies and improve overall EMI performance.
How does the MAX16903SAUE33/V+T handle input voltage transients, and what is its maximum survivable voltage?
The MAX16903SAUE33/V+T tolerates input transients up to +42V for indefinite duration, as specified in Absolute Maximum Ratings. Its enable pin (EN) is rated from +3.3V logic level to +42V, and internal circuitry remains functional during cold-crank events down to +3.5V - making it suitable for direct connection to automotive battery rails without external protection circuitry.
What thermal protection features are implemented in the MAX16903SAUE33/V+T?
The MAX16903SAUE33/V+T includes thermal shutdown at +175°C (typical) with 15°C hysteresis, ensuring automatic recovery once die temperature falls below +160°C. During overtemperature events, the device disables switching and initiates soft-start restart every 30ms. Combined with its 16-pin TSSOP-EP package and exposed pad, this provides robust thermal resilience in high-ambient automotive environments.
Is the MAX16903SAUE33/V+T pin-compatible with other variants in the MAX16903 family?
No - the MAX16903SAUE33/V+T uses the 16-pin TSSOP-EP package, while TDFN variants (e.g., MAX16903SATB33/V+) use a 10-pin 3mm × 3mm footprint. Pin functions are identical across packages, but physical layout, thermal pad configuration, and pin numbering differ. Migration requires PCB redesign; however, schematic-level design reuse is supported through consistent signal naming and functional equivalence.
MAX16903SAUE33/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:
- 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+T FAQ
1.How can I place an order for MAX16903SAUE33/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16903SAUE33/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 MAX16903SAUE33/V+T reliable?
The price and inventory of MAX16903SAUE33/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 MAX16903SAUE33/V+T is usually 5 days.
3.What payment methods are accepted for MAX16903SAUE33/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16903SAUE33/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16903SAUE33/V+T?
MAX16903SAUE33/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16903SAUE33/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 MAX16903SAUE33/V+T?
For technical support, including MAX16903SAUE33/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16903SAUE33/V+T requirements.
6.How does Aetrix verify that MAX16903SAUE33/V+T is sourced from the original manufacturer or authorized distributors?
All MAX16903SAUE33/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 MAX16903SAUE33/V+T meets industry standards.
7.What is the process for return or replacement of MAX16903SAUE33/V+T?
All MAX16903SAUE33/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16903SAUE33/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 MAX16903SAUE33/V+T part is unused and in its original packaging.
Return procedure for MAX16903SAUE33/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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