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Analog Devices Inc./Maxim Integrated MAX16903SAUE50/V+
- Part No.:
- MAX16903SAUE50/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16903SAUE50/V+.pdf
- Description:
- IC REG BUCK 5V 1A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,314
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Product details
Overview
MAX16903SAUE50/V+ 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, 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/V+ datasheet, MAX16903SAUE50/V+ pinout, MAX16903SAUE50/V+ application, or MAX16903SAUE50/V+ equivalent, key selection criteria include its AEC-Q100 qualification, spread-spectrum EMI reduction, 2.1MHz switching frequency with SYNC-programmable modes (skip/forced-PWM/external sync), and thermally enhanced 16-pin TSSOP-EP package with exposed pad.
Technical Context
The MAX16903SAUE50/V+ uses current-mode control with internal slope compensation and requires no external loop compensation. Its 80ns minimum on-time enables stable regulation down to 5V output even at 18V input, while dropout operation at >97% duty cycle maintains output during automotive cold-crank events.
It integrates a +5V BIAS LDO for internal logic, features programmable undervoltage lockout (3.0V typ), and implements thermal shutdown at 175°C with 15°C hysteresis. The PGOOD open-drain output asserts when VOUT drops below 91% of nominal and releases above 93%, with 10µs debounce.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +3.5V to +28V; supports automotive battery systems including cold-crank (down to 3.5V) and load-dump transients up to +42V |
| Output Voltage | Fixed 5.0V ±2.5% over full temperature and load range; factory-trimmed, no external feedback required |
| Max Output Current | 1.0A continuous; peak current limit set at 1.5A (±15%) with automatic hiccup-mode recovery on short circuit |
| Switching Frequency | 2.1MHz typical; supports forced PWM, skip mode, and external synchronization via SYNC pin |
| Quiescent Current | 25µA typical in skip mode at no load; enables compliance with OEM standby current budgets in always-on vehicle modules |
| Thermal Range | -40°C to +125°C junction; AEC-Q100 qualified for automotive under-hood and infotainment applications |
| EMI Reduction | Spread-spectrum modulation enabled (+6% frequency dither); reduces radiated emissions without compromising AM-band immunity |
Pinout & Package
MAX16903SAUE50/V+ 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 (θJA = 38.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | SUP | Main input supply rail; accepts 3.5V–28V; requires 4.7µF ceramic capacitor placed adjacent to pins |
| 3, 4 | LX | Switch node connecting internal high-/low-side FETs to external inductor; must be routed with minimal loop area |
| 5, 6 | PGND | Power ground return for high-current paths; tied directly to exposed pad and output capacitor negative terminal |
| 7 | OUTS | Voltage sense input; connects to regulated 5V output via 10µF X7R ceramic bypass capacitor |
| 8 | PGOOD | Open-drain power-good signal; pulled low if VOUT < 91% of 5V; requires external 20kΩ pull-up to BIAS or system rail |
| 9, 10 | SUP | Second SUP pin; electrically identical to pins 1–2; must be connected together per layout guidelines |
| 11 | SYNC | Mode control input; grounded → skip mode; driven to BIAS or clock → forced PWM; unconnected defaults to skip |
| 12 | BIAS | +5V internal LDO output; powers internal logic; requires 2.2µF ceramic capacitor to GND |
| 13 | GND | Analog ground reference; isolated from PGND except at single-point connection near output capacitor |
| 14 | EN | Enable input; high-voltage compatible (3.3V logic to +42V); no internal pullup/pulldown; activates regulator when >2.4V |
| 15 | BST | Bootstrap capacitor connection (0.1µF); supplies gate drive voltage for high-side FET; critical for dropout operation |
| 16 | N.C. | No internal connection; left floating or tied to PGND per layout best practice |
| EP | Exposed Pad | Thermal and electrical connection to PGND; mandatory for thermal performance and EMI control; not a substitute for PGND routing |
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 drivers |
| Automotive Qualification | AEC-Q100 Grade 0 certified; validated across -40°C to +125°C ambient with 150°C junction limit and 175°C thermal shutdown |
| Dynamic Mode Selection | SYNC pin toggles between skip mode (25µA IQ) and forced PWM (fixed 2.1MHz) without external components or firmware |
| Robust Input Handling | Tolerates +42V transients and operates down to 3.5V input-meets ISO 7637-2 Pulse 4 (cold crank) requirements |
| EMI-Optimized Operation | Spread-spectrum modulation (+6%) reduces peak radiated emissions while maintaining >1.8MHz minimum frequency to avoid AM band |
Applications
| Automotive Infotainment Power Supply | ADAS Camera Module Bias Rail |
|---|---|
Use Scenario: Powers SoC, display interface, and audio codecs in head-unit systems requiring always-on 5V rail with ultra-low standby current. IC Role / Device Role / Timing Role: Primary 5V buck regulator with PGOOD monitoring and cold-crank support. Use Value: 25µA skip-mode IQ meets OEM <50µA module sleep budget; AEC-Q100 qualification ensures reliability in dashboard environments. |
Use Scenario: Supplies clean 5V to image sensor and ISP in rear-view or surround-view camera modules mounted near engine bay. IC Role / Device Role / Timing Role: High-input-voltage buck converter with transient tolerance and thermal protection. Use Value: +42V transient rating handles load dump; 125°C operation sustains function in under-hood thermal zones. |
| Industrial Control I/O Module | Telematics Gateway Power Management |
Use Scenario: Generates isolated 5V rail for PLC digital I/O circuits operating from 24V industrial bus with wide input variation. IC Role / Device Role / Timing Role: Compact, high-efficiency DC-DC stage replacing discrete solutions. Use Value: 2.1MHz switching allows use of 4.7µH inductor and small 10µF output cap-reducing board space by >40% vs. 500kHz alternatives. |
Use Scenario: Powers LTE modem, GNSS receiver, and CAN transceiver in vehicle telematics units requiring EMI-compliant 5V supply. IC Role / Device Role / Timing Role: Spread-spectrum-enabled buck converter meeting CISPR 25 Class 5 radiated emissions limits. Use Value: Integrated SS modulation eliminates need for external EMI filters or ferrite beads-cutting BOM cost and layout complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QRTWRQ1 | 4.5V–36V input, 3.3V/5V adjustable output, 8A capability; no spread spectrum; larger 16-pin WQFN package | Higher current capacity but lacks factory-trimmed 5V option and SS modulation; suited for scalable multi-rail designs | Select LM61480QRTWRQ1 only if >1A output or adjustable VOUT is required; MAX16903SAUE50/V+ offers tighter 5V accuracy and lower IQ in fixed-output use cases |
| TPS62933QPWRRQ1 | 3V–18V input, fixed 5V output, 3A rating; 2.2MHz switching; no cold-crank support below 3.5V; no +42V transient tolerance | Lower input range excludes direct cold-crank operation; optimized for 12V systems only | Choose TPS62933QPWRRQ1 for compact 12V-to-5V conversion where cold-crank immunity is not needed; MAX16903SAUE50/V+ remains preferred for full automotive battery range |
Compared with LM61480QRTWRQ1 and TPS62933QPWRRQ1, the MAX16903SAUE50/V+ uniquely combines factory-trimmed 5V output, +42V transient tolerance, cold-crank operation, and integrated spread-spectrum EMI reduction in a thermally optimized TSSOP-EP package-making it the most direct fit for cost-sensitive, space-constrained automotive 5V point-of-load applications.
Availability
MAX16903SAUE50/V+ is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, industrial control I/O, and telematics gateway designs requiring stable component supply with AEC-Q100 assurance and long-term production continuity.
Supply support for MAX16903SAUE50/V+ 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 high-performance analog and mixed-signal ICs for automotive, industrial, and communications markets with emphasis on reliability and integration.
The MAX16903 product line delivers compact, AEC-Q100-qualified buck converters targeting automotive power management-specifically engineered for cold-crank resilience, low-IQ standby, and EMI-compliant operation in space-constrained modules.
FAQ
What is the output voltage accuracy of the MAX16903SAUE50/V+ across temperature and load?
The MAX16903SAUE50/V+ delivers 5.0V output with ±2.5% accuracy over the full -40°C to +125°C temperature range and 0–1A load current. This specification holds for both fixed-frequency and skip-mode operation, ensuring stable power delivery to sensitive downstream logic without external trimming or calibration.
Does the MAX16903SAUE50/V+ support spread-spectrum modulation, and how is it enabled?
Yes, the MAX16903SAUE50/V+ includes factory-enabled spread-spectrum frequency modulation (+6% dither around 2.1MHz). No external configuration is required-the feature is active whenever the device operates in internally generated switching mode (i.e., when SYNC is unconnected or grounded). It remains disabled during external synchronization.
What is the maximum input voltage transient the MAX16903SAUE50/V+ can withstand?
The MAX16903SAUE50/V+ is rated to tolerate input transients up to +42V for durations ≤1 second, satisfying ISO 7637-2 Pulse 1 and Pulse 4 requirements for automotive applications. This robustness enables reliable operation during load-dump events and cold-crank conditions without external TVS clamping.
How does the MAX16903SAUE50/V+ achieve ultra-low quiescent current in standby mode?
The MAX16903SAUE50/V+ enters standby mode (25µA IQ) when load current falls below 5mA and SYNC is low or unconnected. In this state, the internal high-voltage LDO and non-essential circuitry are powered down while maintaining regulation-enabling compliance with stringent OEM sleep-current specifications for always-on vehicle modules.
Is the MAX16903SAUE50/V+ pin-compatible with other variants in the MAX16903 family?
Yes, all MAX16903 variants-including MAX16903SAUE50/V+, MAX16903RAUE50/V+, and MAX16903SATB50/V+-share identical pinouts within their respective packages (TSSOP-EP or TDFN-EP). The MAX16903SAUE50/V+ uses the 16-pin TSSOP-EP footprint, which is mechanically and electrically interchangeable with other SAUE__/V+ and RAUE__/V+ versions.
MAX16903SAUE50/V+ 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/V+ FAQ
1.How can I place an order for MAX16903SAUE50/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16903SAUE50/V+ 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/V+ reliable?
The price and inventory of MAX16903SAUE50/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16903SAUE50/V+ is usually 5 days.
3.What payment methods are accepted for MAX16903SAUE50/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16903SAUE50/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16903SAUE50/V+?
MAX16903SAUE50/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16903SAUE50/V+ 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/V+?
For technical support, including MAX16903SAUE50/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16903SAUE50/V+ requirements.
6.How does Aetrix verify that MAX16903SAUE50/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16903SAUE50/V+ 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/V+ meets industry standards.
7.What is the process for return or replacement of MAX16903SAUE50/V+?
All MAX16903SAUE50/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16903SAUE50/V+, 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/V+ part is unused and in its original packaging.
Return procedure for MAX16903SAUE50/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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