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Analog Devices Inc./Maxim Integrated MAX16903SAUE50+
- Part No.:
- MAX16903SAUE50+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16903SAUE50+.pdf
- Description:
- IC REG BUCK 5V 1A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,789
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Product details
Overview
The MAX16903SAUE50+ from Maxim Integrated is a synchronous buck DC-DC converter 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, tolerates +42V transients, and draws only 25µA quiescent current in skip mode-enabling cold-crank operation in automotive infotainment power rails.
For engineers reviewing the MAX16903SAUE50+ datasheet, MAX16903SAUE50+ pinout, MAX16903SAUE50+ application, or MAX16903SAUE50+ equivalent, this page delivers verified package mapping (16-pin TSSOP-EP), confirmed spread-spectrum EMI reduction (+6%), validated PGOOD monitoring, and real-world thermal performance (θJA = 38.3°C/W) for AEC-Q100-compliant designs.
Technical Context
The MAX16903SAUE50+ uses current-mode control with internal slope compensation and no external compensation required. Its 2.1MHz switching frequency enables compact 4.7µH inductors and ceramic capacitors while avoiding AM-band interference (1.8–2.6MHz SYNC range).
It supports three operational modes via the SYNC pin: skip mode (25µA IQ), forced PWM (fixed-frequency), and external synchronization. Spread-spectrum modulation-enabled on this variant-is applied only during internally generated clock operation and shifts frequency +6% to reduce peak EMI without compromising AM-band immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +3.5V to +28V; withstands +42V transients-supports automotive cold-crank and load-dump conditions. |
| Output Voltage | Fixed 5.0V ±2.5% over full temperature and load range-no external feedback resistors required. |
| Max Output Current | 1A continuous; peak current limit 1.5A (±15%)-provides robust short-circuit protection without external sensing. |
| Quiescent Current | 25µA in skip mode-meets OEM standby current budgets for always-on vehicle modules. |
| Switching Frequency | 2.1MHz (±6.25%); spread-spectrum enabled-reduces radiated emissions while maintaining >1.8MHz minimum to avoid AM band. |
| Thermal Performance | θJA = 38.3°C/W (TSSOP-EP); junction-to-case θJC = 3°C/W-enables 1A operation at +125°C ambient with minimal heatsinking. |
| PGOOD Threshold | Active-high open-drain output asserting at ≥93% VOUT and deasserting at ≤91% VOUT-provides precise power-rail sequencing and fault detection. |
Pinout & Package
MAX16903SAUE50+ 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 dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | SUP | Main input supply (3.5V–28V); requires 4.7µF ceramic capacitor placed adjacent to pins for high-frequency decoupling. |
| 2, 14 | GND | Analog ground reference; must be connected to PGND at output capacitor return to minimize noise coupling. |
| 3, 13 | LX | Switch node connecting internal high/low-side FETs to external inductor; high dv/dt node requiring tight layout. |
| 4, 11, 12 | PGND | Power ground return for LX, SUP, and OUTS; multiple pins reduce IR drop and improve thermal conduction to EP. |
| 5 | OUTS | Voltage sense input; connects to output capacitor; bypassed with ≥10µF X7R ceramic for stability. |
| 6 | PGOOD | Open-drain power-good signal; pulled up externally (20kΩ typical) to indicate regulated 5V output within tolerance. |
| 7 | SYNC | Mode-select input: grounded → skip mode; tied to BIAS or clock → forced PWM; enables dynamic efficiency optimization. |
| 8 | BIAS | +5V internal LDO output; powers internal logic; requires 2.2µF ceramic capacitor to GND for ripple suppression. |
| 9 | EN | High-voltage enable input (3.3V–42V compatible); no internal pullup-enables direct microcontroller or KEY-signal control. |
| 10, 16 | BST | Bootstrap capacitor terminal (0.1µF); supplies gate drive for high-side FET-critical for >97% dropout operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Rated for automotive -40°C to +125°C operation with full qualification testing-meets ISO/TS 16949 production requirements. |
| Integrated high/low-side FETs | RDS(ON) = 400mΩ (HS) / 250mΩ (LS)-eliminates external MOSFETs and gate drivers, reducing BOM count and board area by >30%. |
| Spread-spectrum EMI reduction | +6% frequency modulation-lowers peak radiated emissions by up to 10dB without affecting regulation or transient response. |
| 97% dropout duty cycle | Maintains regulation down to VSUP = VOUT + 0.3V-enables stable 5V output during deep battery sag (e.g., <6V cranking). |
| Programmable soft-start | 8ms internal ramp time-prevents inrush current and output overshoot during power-up or recovery from fault conditions. |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers SoC, display interface, and audio codecs in head units under wide battery voltage swings (5V–16V nominal, down to 3.5V cold crank). IC Role / Device Role / Timing Role: Primary 5V buck regulator with PGOOD sequencing and transient immunity-ensures clean startup and uninterrupted operation during engine start. Use Value: 25µA skip-mode IQ extends battery life in parked mode; +42V transient tolerance prevents damage during load dump events. |
Use Scenario: Supplies image sensor and ISP in rear-view or surround-view cameras operating in under-hood environments. IC Role / Device Role / Timing Role: High-efficiency 5V source with thermal shutdown (175°C) and robust ESD protection (±2kV HBM)-maintains reliability in high-temp, vibration-prone zones. Use Value: 38.3°C/W θJA enables 1A delivery at +125°C ambient without derating; spread-spectrum reduces EMI that could corrupt image data lines. |
| Industrial Control I/O Module | Telematics Gateway Power |
Use Scenario: Generates 5V rail for PLC digital I/O, CAN transceivers, and isolated communication interfaces in factory automation equipment. IC Role / Device Role / Timing Role: Input-transient-hardened DC-DC converter with EN-controlled sequencing-synchronizes power-up with controller reset signals. Use Value: Enable-pin compatibility with 3.3V logic simplifies MCU integration; PGOOD enables firmware-level power health monitoring. |
Use Scenario: Powers LTE modem, GNSS receiver, and secure element in vehicle telematics units requiring always-on connectivity. IC Role / Device Role / Timing Role: Low-IQ buck regulator with spread-spectrum and SYNC programmability-balances RF coexistence, battery drain, and thermal constraints. Use Value: Forced PWM mode eliminates subharmonic noise near cellular bands; 2.1MHz switching avoids interference with GNSS L1 (1.575GHz) harmonics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQR | 4.5V–36V input, 8A output, 2.1MHz, no spread-spectrum, QFN-16 package | Higher current capacity but larger solution size; lacks AEC-Q100 qualification and cold-crank support below 4.5V | Select when >1A output or wider VIN range is needed; verify thermal design for 1A use case. |
| TPS62933RTER | 3V–18V input, 3A output, 2.25MHz, spread-spectrum, QFN-16, AEC-Q100 Grade 1 | Narrower input range excludes cold-crank operation; higher IQ (40µA) and no +42V transient rating | Prefer for non-automotive industrial apps where 18V max input suffices and lower cost is prioritized. |
Compared with LM61480RQR and TPS62933RTER, the MAX16903SAUE50+ uniquely combines cold-crank capability (3.5V start), +42V transient tolerance, AEC-Q100 qualification, and integrated spread-spectrum-all in a 16-pin TSSOP-EP footprint optimized for thermal performance in space-constrained automotive modules.
Availability
MAX16903SAUE50+ is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial control I/O requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX16903SAUE50+ 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 AEC-Q100-compliant automotive subsystems requiring cold-crank resilience, EMI control, and thermal robustness.
FAQ
What is the maximum input voltage the MAX16903SAUE50+ can tolerate without damage?
The MAX16903SAUE50+ has an absolute maximum input voltage rating of +42V for durations under 1 second. This transient tolerance allows it to survive automotive load-dump events without external protection circuitry. Continuous operation is specified from +3.5V to +28V. The device remains functional during cold-crank conditions down to 3.5V input while maintaining regulated 5V output.
Does the MAX16903SAUE50+ require external compensation components?
No, the MAX16903SAUE50+ uses current-mode control with internal slope compensation and does not require external compensation components. Its fixed 5V output configuration eliminates feedback resistor networks. Stability is ensured with standard external components: 4.7µH inductor, 4.7µF input capacitor, 10µF output capacitor, and 0.1µF BST capacitor-all specified in the typical operating circuit.
How does the spread-spectrum feature work on the MAX16903SAUE50+?
The MAX16903SAUE50+ implements spread-spectrum frequency modulation by varying its internal 2.1MHz oscillator frequency +6% upward-only when operating in internally generated clock mode. This modulation reduces peak radiated EMI without shifting into the AM radio band (≥1.8MHz guaranteed). It is disabled during external SYNC operation and does not affect PGOOD timing or regulation accuracy.
What is the thermal resistance (θJA) of the MAX16903SAUE50+ package?
The MAX16903SAUE50+ in its 16-pin TSSOP-EP package has a junction-to-ambient thermal resistance (θJA) of 38.3°C/W when mounted on a standard four-layer JEDEC PCB per JESD51-7. Its junction-to-case (θJC) is 3°C/W, enabling efficient heat transfer to the PCB's exposed pad. This allows full 1A output at +125°C ambient with proper copper pour and via design.
Can the MAX16903SAUE50+ operate in dropout mode, and what is the minimum input voltage for regulation?
Yes, the MAX16903SAUE50+ operates in dropout by achieving >97% duty cycle, maintaining 5V regulation down to VSUP = VOUT + 0.3V (i.e., ~5.3V). During deep dropout, the high-side FET is periodically turned off for ~150ns every 6.5µs to recharge the BST capacitor-ensuring gate drive integrity while sustaining output voltage during battery sag below 6V.
MAX16903SAUE50+ 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):
- 5V
- 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
MAX16903SAUE50+ FAQ
1.How can I place an order for MAX16903SAUE50+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16903SAUE50+ 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 MAX16903SAUE50+ reliable?
The price and inventory of MAX16903SAUE50+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16903SAUE50+ is usually 5 days.
3.What payment methods are accepted for MAX16903SAUE50+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16903SAUE50+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16903SAUE50+?
MAX16903SAUE50+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16903SAUE50+ 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 MAX16903SAUE50+?
For technical support, including MAX16903SAUE50+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16903SAUE50+ requirements.
6.How does Aetrix verify that MAX16903SAUE50+ is sourced from the original manufacturer or authorized distributors?
All MAX16903SAUE50+ 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 MAX16903SAUE50+ meets industry standards.
7.What is the process for return or replacement of MAX16903SAUE50+?
All MAX16903SAUE50+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16903SAUE50+, 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 MAX16903SAUE50+ part is unused and in its original packaging.
Return procedure for MAX16903SAUE50+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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