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Analog Devices Inc./Maxim Integrated MAX16903RAUE50+T
- Part No.:
- MAX16903RAUE50+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
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MAX16903RAUE50+T.pdf
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Product details
Overview
MAX16903RAUE50+T from Maxim Integrated is a synchronous buck DC-DC converter IC with integrated high-side and low-side MOSFETs, delivering 1A output at fixed 5V with ±2.5% accuracy over -40°C to +125°C. It operates from 3.5V–28V input, achieves 25μA quiescent current in skip mode, and runs at 2.1MHz switching frequency to minimize external component size-designed for automotive cold-crank and industrial high-voltage input applications.
For engineers reviewing the MAX16903RAUE50+T datasheet, MAX16903RAUE50+T pinout, MAX16903RAUE50+T application, or MAX16903RAUE50+T equivalent, key selection criteria include its AEC-Q100 qualification, 97% dropout duty cycle, spread-spectrum EMI reduction option, and compatibility with 16-pin TSSOP-EP thermal package for automotive power rail regulation.
Technical Context
The MAX16903RAUE50+T implements current-mode control with internal soft-start (8ms ramp), undervoltage lockout (3.0V typ), and thermal shutdown (175°C). Its SYNC pin enables dynamic selection between forced PWM (fixed 2.1MHz), skip mode (25μA IQ), and external clock synchronization (1.8–2.6MHz range).
It features integrated bootstrap driver (BST), open-drain PGOOD monitoring (91–93% threshold), and overcurrent protection with 1.5A peak limit (±15% tolerance). The device tolerates +42V transients and supports enable logic from 3.3V up to battery voltage without external level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +3.5V to +28V; supports automotive cold-crank down to 3.5V and withstands +42V transients for robust system-level protection. |
| Output Voltage | Fixed 5.0V ±2.5% (over full temp/load range); factory-trimmed, no external feedback required. |
| Max Output Current | 1A continuous; includes overcurrent protection with 1.5A peak limit and automatic restart on short-circuit removal. |
| Switching Frequency | 2.1MHz typical; programmable via SYNC pin for forced PWM, skip mode, or external sync-avoids AM band interference. |
| Quiescent Current | 25μA typical in skip mode; drops to <1μA in shutdown-meets OEM standby current budgets for always-on automotive modules. |
| Operating Temperature | -40°C to +125°C ambient; AEC-Q100 qualified for under-hood automotive use and harsh industrial environments. |
| Package | 16-pin TSSOP-EP (5mm × 4.4mm); exposed pad thermally connected to PGND for enhanced power dissipation (θJA = 38.3°C/W). |
Pinout & Package
MAX16903RAUE50+T is housed in a thermally enhanced 16-pin TSSOP-EP package (5mm × 4.4mm, 0.65mm pitch) with exposed pad soldered to PGND for optimal thermal performance.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | SUP | Main input supply (3.5–28V); requires 4.7µF ceramic capacitor placed adjacent to pins for high-frequency decoupling. |
| 3, 4, 5 | PGND | Power ground return for high-current LX switching path; must be tied together and connected to exposed pad. |
| 6, 7 | LX | Switch node connecting internal high/low-side FETs to external inductor; high dv/dt node requiring tight layout. |
| 8 | PGOOD | Open-drain power-good signal active high when VOUT ≥ 93% of nominal; requires external 20kΩ pull-up to BIAS or VCC. |
| 9, 10 | SUP | Duplicate SUP pins-must be electrically joined to ensure proper current sharing and noise immunity. |
| 11 | SYNC | Mode-select input: grounded = skip mode; driven by BIAS or clock = forced PWM; enables EMI optimization and multi-rail synchronization. |
| 12 | BIAS | +5V internal LDO output; powers internal logic and requires 2.2µF ceramic bypass to GND for stability. |
| 13 | GND | Analog ground reference; isolated from PGND except at single-point connection near output capacitor. |
| 14 | EN | High-voltage enable input (3.3V–42V compatible); no internal pull-up/down-enables direct microcontroller or KEY signal control. |
| 15, 16 | BST | Bootstrap capacitor node (0.1µF) for high-side gate drive; critical for maintaining >97% duty cycle in dropout operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Validated for automotive applications including temperature cycling, HAST, and mechanical shock per Grade 0 (-40°C to +125°C). |
| Integrated Power Stage | On-chip high-side (400–800mΩ) and low-side (250–450mΩ) DMOS FETs eliminate external MOSFETs and gate drivers-reducing BOM count and board area. |
| Spread-Spectrum Option | Available with +6% frequency modulation (MAX16903SAUE50+T variant); reduces peak EMI emissions without affecting SYNC synchronization capability. |
| Dropout Operation | Maintains regulation at >97% duty cycle; enables stable 5V output even during automotive cold-crank events down to 3.5V input. |
| Three-Mode Control | SYNC-configurable operation: skip mode (ultra-low IQ), forced PWM (tight ripple control), or external sync (multi-rail timing alignment). |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Power Supply |
|---|---|
Use Scenario: Regulating 5V rail for microcontroller, CAN transceiver, and sensor interface in body electronics modules exposed to battery transients. IC Role / Device Role / Timing Role: Primary 5V buck regulator with PGOOD monitoring and cold-crank support. Use Value: Withstands +42V load-dump spikes and maintains 5V output during 3.5V cold-crank-eliminates need for pre-regulator stage. |
Use Scenario: Generating isolated 5V supply for digital I/O expansion cards in programmable logic controllers operating in factory environments. IC Role / Device Role / Timing Role: High-efficiency, low-noise local DC-DC converter powering FPGA configuration and level-shifting circuitry. Use Value: 2.1MHz switching enables compact 4.7µH inductor and 10µF ceramic output capacitor-reducing footprint vs. 500kHz alternatives. |
| Automotive Infotainment Head Unit | High-Voltage Industrial Sensor Node |
Use Scenario: Powering audio DSP, display controller, and USB PHY in infotainment systems requiring low EMI and fast transient response. IC Role / Device Role / Timing Role: Main 5V supply with spread-spectrum EMI reduction and PGOOD sequencing signal. Use Value: Skip-to-PWM mode transition ensures clean 5V rail during audio playback bursts while minimizing standby power draw. |
Use Scenario: Converting 24V industrial bus to 5V for smart pressure/temperature sensors with wireless telemetry. IC Role / Device Role / Timing Role: Input-tolerant buck regulator enabling direct connection to unregulated 24V field wiring. Use Value: 25μA quiescent current extends battery life in energy-harvesting or low-power wake-on-event sensor nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQWR | 3.5–36V input, 5V fixed output, 1.2A rating, 2.1MHz freq; no spread-spectrum; QFN-16 package (3mm × 3mm). | Higher max current but lacks AEC-Q100 qualification and cold-crank validation; better suited for industrial-only designs. | Select LM61480RQWR if higher output current margin is needed and automotive qualification is not required. |
| TPS62933RTER | 3–36V input, 5V fixed output, 3A rating, 1.8–2.2MHz freq; integrated compensation; WQFN-16 (3mm × 3mm). | Higher current and smaller package, but only rated to +105°C ambient and not AEC-Q100 qualified. | Choose TPS62933RTER for space-constrained industrial applications where extended temperature range is not mandatory. |
Compared with LM61480RQWR and TPS62933RTER, MAX16903RAUE50+T uniquely combines AEC-Q100 qualification, -40°C to +125°C operation, +42V transient tolerance, and cold-crank capability-making it the only drop-in solution for automotive 5V rail generation where reliability under extreme conditions is non-negotiable.
Availability
MAX16903RAUE50+T is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC power supplies, and high-voltage sensor nodes requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX16903RAUE50+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 MAX16903 product line delivers compact, AEC-Q100-qualified buck converters optimized for automotive power rails-designed to replace discrete FET + controller solutions in space- and reliability-constrained applications.
FAQ
What is the output voltage of the MAX16903RAUE50+T?
The MAX16903RAUE50+T provides a factory-trimmed fixed 5.0V output with ±2.5% accuracy over the full -40°C to +125°C temperature range and 0–1A load. It does not require external feedback resistors, simplifying design and improving long-term stability compared to adjustable buck regulators.
Does the MAX16903RAUE50+T support spread-spectrum frequency modulation?
No-the MAX16903RAUE50+T variant does not include spread-spectrum modulation. That feature is only available in parts with "S" prefix (e.g., MAX16903SAUE50+T). The "R" prefix indicates standard frequency operation without modulation, retaining full 2.1MHz fixed-frequency or skip-mode functionality.
What package type is used for the MAX16903RAUE50+T?
The MAX16903RAUE50+T uses a 16-pin TSSOP-EP package (5mm × 4.4mm) with exposed thermal pad. This package offers superior thermal performance (θJA = 38.3°C/W) versus the 10-pin TDFN option and is optimized for automotive PCB layouts requiring robust heat dissipation.
Is the MAX16903RAUE50+T AEC-Q100 qualified?
Yes-the MAX16903RAUE50+T carries the "/V" suffix in its full orderable part number (MAX16903RAUE50/V+), confirming AEC-Q100 qualification for automotive applications. It meets stress testing requirements for temperature cycling, humidity, and mechanical shock across Grade 0 (-40°C to +125°C).
How does the MAX16903RAUE50+T handle cold-crank conditions?
The MAX16903RAUE50+T maintains regulated 5V output during cold-crank events by operating at up to 97% duty cycle when input drops to 3.5V. Its undervoltage lockout (3.0V typ) prevents erratic startup, and +42V transient tolerance protects against load-dump spikes-ensuring uninterrupted power to safety-critical automotive subsystems.
MAX16903RAUE50+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
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- Voltage - Input (Max):
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- Voltage - Output (Min/Fixed):
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- Voltage - Output (Max):
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MAX16903RAUE50+T FAQ
1.How can I place an order for MAX16903RAUE50+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16903RAUE50+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 MAX16903RAUE50+T reliable?
The price and inventory of MAX16903RAUE50+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16903RAUE50+T is usually 5 days.
3.What payment methods are accepted for MAX16903RAUE50+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16903RAUE50+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16903RAUE50+T?
MAX16903RAUE50+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16903RAUE50+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 MAX16903RAUE50+T?
For technical support, including MAX16903RAUE50+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16903RAUE50+T requirements.
6.How does Aetrix verify that MAX16903RAUE50+T is sourced from the original manufacturer or authorized distributors?
All MAX16903RAUE50+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 MAX16903RAUE50+T meets industry standards.
7.What is the process for return or replacement of MAX16903RAUE50+T?
All MAX16903RAUE50+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16903RAUE50+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 MAX16903RAUE50+T part is unused and in its original packaging.
Return procedure for MAX16903RAUE50+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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