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Analog Devices Inc./Maxim Integrated MAX16903SAUE50/V+T
- Part No.:
- MAX16903SAUE50/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16903SAUE50/V+T.pdf
- Description:
- IC REG BUCK 5V 1A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,177
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Product details
Overview
The MAX16903SAUE50/V+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, 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+T datasheet, MAX16903SAUE50/V+T pinout, MAX16903SAUE50/V+T application, or MAX16903SAUE50/V+T 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 data (θJA = 38.3°C/W) for automotive-grade design validation.
Technical Context
This current-mode buck regulator uses internal slope compensation and requires no external loop compensation. Its 2.1MHz switching frequency enables compact 4.7µH inductors and ceramic capacitors while avoiding AM-band interference (1.8–2.6MHz SYNC range).
Operation modes are determined by SYNC pin state: grounded/unconnected enables skip mode (25µA IQ); driven by BIAS or external clock forces fixed-frequency PWM; spread-spectrum modulation is active only during internal oscillator operation and shifts frequency +6% without affecting SYNC synchronization capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +3.5V to +28V; withstands +42V transients for automotive cold-crank and load-dump survival |
| Output Voltage | Fixed 5.0V ±2.5% over full temperature and load range (0–1A) |
| Switching Frequency | 2.1MHz typical; supports small magnetics and low-output-ripple designs |
| Quiescent Current | 25µA in skip mode-meets OEM standby current budgets for always-on modules |
| Output Current | 1A continuous; peak current limit 1.5A ±15% ensures robust short-circuit protection |
| Thermal Range | -40°C to +125°C ambient; AEC-Q100 qualified for under-hood automotive use |
| EMI Reduction | Optional spread-spectrum modulation (+6% frequency deviation) lowers radiated emissions without compromising SYNC lock |
Pinout & Package
MAX16903SAUE50/V+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 θJA = 38.3°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SUP (Pins 14,15) | Input voltage supply rail | Dual pins must be connected together; requires 4.7µF ceramic capacitor placed adjacent to minimize high-frequency noise |
| LX (Pins 12,13) | Switch node | High-current switching path; dual pins must be paralleled to handle 1.5A RMS current and reduce trace inductance |
| PGND (Pins 10,11) | Power ground return | Dual low-impedance paths for switch current return; connect directly to exposed pad and output capacitor negative terminal |
| OUTS (Pin 5) | Voltage feedback sense | Connects to output capacitor via 10µF X7R ceramic; sets regulation point for 5V output |
| PGOOD (Pin 6) | Open-drain power-good indicator | Active-high signal asserts when VOUT ≥ 93% of nominal; debounced 10µs for reliable system sequencing |
| SYNC (Pin 4) | Mode control and synchronization input | GND/unconnected → skip mode; BIAS or external clock → forced PWM; enables dynamic mode switching |
| EN (Pin 1) | Enable control | High-voltage compatible (3.3V logic to +42V); no internal pullup/pulldown to preserve ultra-low IQ |
| BIAS (Pin 13) | Internal 5V LDO output | Supplies internal logic; requires 2.2µF bypass capacitor to GND for stable reference generation |
Key Features
| Feature | Design Value |
|---|---|
| Integrated FETs | High-side RDS(ON) = 400–800mΩ and low-side RDS(ON) = 250–450mΩ eliminate external MOSFETs and gate drivers |
| Dropout Operation | 97% max duty cycle maintains regulation down to VIN ≈ VOUT, critical for automotive battery sag conditions |
| Three-Mode Control | Skip mode (25µA IQ), forced PWM (constant fSW), and external sync-all selectable via single SYNC pin |
| Robust Protection | Overcurrent (1.5A typ), thermal shutdown (175°C), UVLO (3.0V hysteresis), and ±2kV HBM ESD rating |
| Automotive Qualification | AEC-Q100 Grade 1 certified; validated across -40°C to +125°C ambient with production-tested reliability |
Applications
| Infotainment Power Supply | ADAS Camera Module Rail |
|---|---|
Use Scenario: Powering SoC, display controller, and audio codec in vehicle head units with variable battery voltage (6–16V) and cold-crank dips to 3.5V. IC Role / Device Role / Timing Role: Primary 5V buck regulator providing clean, sequenced power with PGOOD confirmation before SoC boot. Use Value: 25µA skip-mode IQ extends battery life during key-off; +42V transient tolerance prevents reset during load dump. |
Use Scenario: Generating stable 5V for image sensor, ISP, and MIPI interface in rear-view or surround-view cameras mounted near engine bay. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC-DC stage with minimal EMI to avoid corrupting analog video signals. Use Value: Spread-spectrum modulation reduces peak radiated emissions; 2.1MHz fSW avoids sensitive RF bands and enables tiny 4.7µH inductor. |
| Telematics Control Unit (TCU) | Body Control Module (BCM) Sub-Rail |
Use Scenario: Supplying 5V to cellular modem, GNSS receiver, and CAN transceiver in always-connected telematics gateways. IC Role / Device Role / Timing Role: Always-on power source with precise PGOOD signaling to enable wake-on-CAN and secure firmware updates. Use Value: AEC-Q100 qualification ensures long-term reliability; 1A output supports burst transmit currents without brownout. |
Use Scenario: Providing isolated 5V rail for microcontroller peripherals (LIN, EEPROM, LED drivers) in centralized body electronics. IC Role / Device Role / Timing Role: Secondary regulator downstream of main 12V buck, requiring tight load regulation and fast transient response. Use Value: 8ms soft-start prevents inrush into downstream capacitance; <±2.5% output accuracy maintains ADC reference stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QWRNXTQ1 | 3.5–36V input, 5V/3.5A output; 2.1MHz fSW; no spread-spectrum; larger 16-pin WQFN (3×3mm) | Higher output current; lacks integrated spread-spectrum EMI reduction | Select when >1A load or tighter thermal constraints require lower RDS(ON) and higher efficiency at full load |
| TPS62933QPWPRQ1 | 3–18V input, 5V/3A output; 2.2MHz fSW; 15µA IQ; no automotive transients support beyond 20V | Lower IQ but unqualified for +42V transients or cold-crank below 3.5V | Select for non-automotive industrial applications where ultra-low IQ dominates over transient robustness |
Compared with LM61480QWRNXTQ1 and TPS62933QPWPRQ1, the MAX16903SAUE50/V+T uniquely combines AEC-Q100 qualification, +42V transient tolerance, spread-spectrum EMI control, and 25µA skip-mode IQ in a single 16-pin TSSOP-EP package-making it optimal for cost-sensitive, space-constrained automotive subsystems requiring guaranteed cold-crank operation.
Availability
MAX16903SAUE50/V+T is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and telematics control units requiring stable component supply with full AEC-Q100 compliance and long-lifecycle support.
Supply support for MAX16903SAUE50/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 belongs to Maxim's automotive-grade power management portfolio, engineered specifically for high-input-voltage DC-DC conversion in harsh environments with stringent EMI, reliability, and cold-crank requirements.
FAQ
What is the maximum input voltage transient tolerance for the MAX16903SAUE50/V+T?
The MAX16903SAUE50/V+T tolerates input voltage transients up to +42V for indefinite duration, enabling reliable operation during automotive load-dump events. This rating is validated per ISO 7637-2 and is intrinsic to the device's internal high-voltage architecture-not dependent on external components. The MAX16903SAUE50/V+T maintains regulation down to 3.5V input, supporting cold-crank conditions without dropout.
Does the MAX16903SAUE50/V+T require external compensation components?
No, the MAX16903SAUE50/V+T uses internal current-mode control with slope compensation and requires no external compensation network. Its fixed 5V output is factory-trimmed and stable across all operating conditions (–40°C to +125°C, 0–1A load). The MAX16903SAUE50/V+T achieves phase margin >45° with standard 4.7µH inductor and 10µF ceramic output capacitor-verified in Maxim's evaluation circuit.
How does spread-spectrum modulation work in the MAX16903SAUE50/V+T?
The MAX16903SAUE50/V+T implements spread-spectrum frequency modulation only when operating from its internal 2.1MHz oscillator-not during external SYNC mode. It modulates frequency +6% upward (1.925–2.275MHz range) to reduce peak radiated EMI without affecting synchronization capability. The MAX16903SAUE50/V+T guarantees no AM-band interference (1.8MHz lower bound) and maintains PGOOD timing integrity during modulation.
What is the thermal performance of the MAX16903SAUE50/V+T in its TSSOP-EP package?
The MAX16903SAUE50/V+T in 16-pin TSSOP-EP achieves θJA = 38.3°C/W and θJC = 3°C/W on a 4-layer JEDEC-standard board. At 1A load and +70°C ambient, junction temperature rise is ~38°C-well below the 150°C absolute max. The exposed pad must be soldered to PGND with ≥4 thermal vias for rated performance. Derating begins above +70°C at 26.1mW/°C.
Can the MAX16903SAUE50/V+T operate in dropout, and what is the minimum on-time?
Yes, the MAX16903SAUE50/V+T sustains regulation in dropout by operating at up to 97% duty cycle, turning off the high-side FET every 6.5µs to recharge the BST capacitor. Its minimum on-time is 80ns (typ), enabling stable 5V output even at 18V input. Below 80ns requirement, the device skips pulses-verified in electrical characteristics tables for line/load regulation across full input range.
MAX16903SAUE50/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):
- 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+T FAQ
1.How can I place an order for MAX16903SAUE50/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16903SAUE50/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 MAX16903SAUE50/V+T reliable?
The price and inventory of MAX16903SAUE50/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 MAX16903SAUE50/V+T is usually 5 days.
3.What payment methods are accepted for MAX16903SAUE50/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16903SAUE50/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16903SAUE50/V+T?
MAX16903SAUE50/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16903SAUE50/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 MAX16903SAUE50/V+T?
For technical support, including MAX16903SAUE50/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16903SAUE50/V+T requirements.
6.How does Aetrix verify that MAX16903SAUE50/V+T is sourced from the original manufacturer or authorized distributors?
All MAX16903SAUE50/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 MAX16903SAUE50/V+T meets industry standards.
7.What is the process for return or replacement of MAX16903SAUE50/V+T?
All MAX16903SAUE50/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16903SAUE50/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 MAX16903SAUE50/V+T part is unused and in its original packaging.
Return procedure for MAX16903SAUE50/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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