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Analog Devices Inc./Maxim Integrated MAX16903RAUE33/V+
- Part No.:
- MAX16903RAUE33/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16903RAUE33/V+.pdf
- Description:
- IC REG BUCK 3.3V 1A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,465
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Product details
Overview
The MAX16903RAUE33/V+ from Maxim Integrated is a synchronous buck DC-DC converter delivering 1A output at fixed 3.3V with integrated high-side and low-side MOSFETs, operating from +3.5V to +28V input and featuring 25μA quiescent current in skip mode. It uses a 2.1MHz switching frequency, supports cold-crank operation down to 3.5V, tolerates +42V transients, and includes PGOOD monitoring - ideal for automotive body control modules and infotainment power rails.
For engineers reviewing the MAX16903RAUE33/V+ datasheet, MAX16903RAUE33/V+ pinout, MAX16903RAUE33/V+ application, or MAX16903RAUE33/V+ equivalent, key selection criteria include its AEC-Q100 qualification, -40°C to +125°C operation, 16-pin TSSOP-EP package with exposed pad, spread-spectrum disable status, and fixed 3.3V output voltage.
Technical Context
This current-mode buck regulator operates in three SYNC-configurable modes: forced fixed-frequency (2.1MHz), skip mode (25μA IQ), or external synchronization (1.8–2.6MHz). Its 97% dropout duty cycle enables stable regulation during automotive cold-crank events.
Internal features include undervoltage lockout (3.0V typ), soft-start (8ms ramp), thermal shutdown (175°C), overcurrent protection (1.5A typ), and open-drain PGOOD with 91–93% output voltage threshold detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.5% over full load/temperature range - ensures compatibility with 3.3V logic and microcontrollers. |
| Input Voltage Range | +3.5V to +28V, with +42V transient tolerance - supports 12V/24V automotive battery systems including cold-crank and load-dump conditions. |
| Max Output Current | 1A continuous, with peak current limit of 1.5A ±15% - provides margin for pulsed loads without external current sensing. |
| Switching Frequency | 2.1MHz typical, adjustable via SYNC pin (1.8–2.6MHz) - enables use of compact 3.3µH inductors and avoids AM radio band interference. |
| Quiescent Current | 25μA in skip mode at no load - meets OEM standby current requirements for always-on vehicle subsystems. |
| Operating Temperature | -40°C to +125°C ambient - qualified per AEC-Q100 Grade 1 for under-hood and cabin-mounted automotive electronics. |
| Package | 16-pin TSSOP-EP (5mm × 4.4mm) with exposed thermal pad - delivers θJA = 38.3°C/W for reliable thermal performance in constrained layouts. |
Pinout & Package
MAX16903RAUE33/V+ uses a thermally enhanced 16-pin TSSOP-EP package (5mm × 4.4mm, 0.65mm pitch) with exposed pad connected to PGND for improved heat dissipation and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | SUP | Primary input supply pin; requires local 4.7µF ceramic capacitor to PGND - dual pins reduce impedance and improve transient response. |
| 3, 4, 5 | PGND | Power ground return for high-current paths; all three pins must be shorted externally - minimizes ground bounce during LX switching transitions. |
| 6, 7 | PGOOD | Open-drain power-good signal; active-high when VOUTS ≥ 93% of nominal - used for system sequencing and fault reporting. |
| 8, 9, 10 | LX | Switch node connecting internal high-/low-side FETs to external inductor - dual pins reduce parasitic inductance and EMI radiation. |
| 11 | OUTS | Voltage feedback sense input; bypassed with ≥10µF X7R ceramic capacitor to PGND - sets regulation point and stabilizes loop dynamics. |
| 12 | SYNC | Mode control input; grounded → skip mode, tied to BIAS or clock → forced PWM - enables dynamic efficiency optimization across load profiles. |
| 13 | BIAS | +5V internal LDO output; supplies internal logic and requires 2.2µF ceramic decoupling to GND - eliminates need for external bias rail. |
| 14 | GND | Analog ground reference; isolated from PGND except at single-point connection near output capacitor - prevents noise coupling into feedback path. |
| 15 | EN | High-voltage enable input; compatible with +3.3V logic up to +42V - allows direct interface with automotive KEY/CAN inhibit signals. |
| 16 | BST | Bootstrap capacitor terminal (0.1µF to LX); charges high-side gate driver - critical for maintaining >97% duty cycle in dropout operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Qualified to Grade 1 (-40°C to +125°C) with automotive reliability testing - meets OEM requirements for safety-critical power rails. |
| Integrated Power Stage | High-side (400–800mΩ) and low-side (250–450mΩ) DMOS FETs - eliminates external MOSFETs and gate drivers, reducing BOM count and layout complexity. |
| Spread-Spectrum Disabled | No frequency modulation applied - simplifies EMI filter design while retaining 2.1MHz fundamental for small passive components. |
| PGOOD Monitoring | Programmable 91–93% output voltage threshold with 10µs debounce - enables precise power-rail validation before downstream logic activation. |
| Thermal Protection | 175°C junction shutdown with 15°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking conditions. |
Applications
| Automotive Body Control Module (BCM) | Automotive Infotainment System |
|---|---|
Use Scenario: Powers microcontroller, CAN transceivers, and sensor interfaces in door modules and lighting controllers requiring always-on operation with <50μA standby draw. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator supplying core logic and communication peripherals - handles cold-crank dips to 3.5V without reset. Use Value: 25μA skip-mode IQ extends battery life during vehicle sleep mode; +42V transient tolerance prevents latch-up during load dump. | Use Scenario: Supplies 3.3V rail to audio DSP, display controller, and USB PHY in head-unit designs where EMI must avoid AM/FM bands. IC Role / Device Role / Timing Role: High-frequency synchronous buck converter generating clean, regulated 3.3V from 12V battery - synchronized via SYNC to avoid beat frequencies with other converters. Use Value: 2.1MHz fixed switching avoids 0.54–1.6MHz AM band; TSSOP-EP package enables compact layout with low thermal resistance. |
| Industrial Telematics Gateway | Railway Onboard Control Unit |
Use Scenario: Provides 3.3V power to LTE modem, GNSS receiver, and secure MCU in fleet-tracking devices deployed in harsh temperature environments. IC Role / Device Role / Timing Role: Automotive-grade DC-DC converter delivering robust 1A output across -40°C to +125°C - monitors rail health via PGOOD for remote diagnostics. Use Value: AEC-Q100 qualification ensures long-term reliability; 97% dropout operation sustains function during brownouts on unregulated 24V rail. | Use Scenario: Powers safety-critical I/O controllers and Ethernet PHYs in EN50155-compliant train management systems with wide input variation. IC Role / Device Role / Timing Role: Input-tolerant buck regulator accepting 24V–110V nominal inputs (via pre-regulator) and delivering stable 3.3V - withstands +42V surges per IEC 61000-4-5. Use Value: Dual SUP/PGND pins reduce PCB trace inductance; exposed pad improves thermal margin in sealed enclosures with limited airflow. |
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 | 4.5–36V input, 3.3V fixed output, 8A capability, 2.1MHz, QFN-16 package | Higher current rating and wider VIN range; not pin-compatible; requires different compensation | Select when >1A output or higher input voltage margin is required; verify thermal design for 8A capability. |
| TPS62933QPWPRQ1 | 3–36V input, 3.3V fixed output, 3A, 2.25MHz, 16-pin HTSSOP, spread-spectrum enabled | Higher current, tighter output accuracy (±1%), but includes mandatory spread-spectrum - may complicate EMI tuning | Prefer for new designs needing higher output current and tighter regulation; avoid if strict 2.1MHz fundamental is required. |
Compared with LM61480QWRNXTQ1 and TPS62933QPWPRQ1, the MAX16903RAUE33/V+ offers lower quiescent current (25μA vs. ~15μA–50μA), AEC-Q100 Grade 1 assurance at minimal cost premium, and proven cold-crank resilience - making it optimal for cost-sensitive, 1A automotive subsystems where standby power dominates lifetime energy budget.
Availability
MAX16903RAUE33/V+ is available at Aetrix Electronics and suitable for automotive body control modules, infotainment systems, and industrial telematics gateways requiring stable component supply with guaranteed AEC-Q100 compliance and extended temperature support.
Supply support for MAX16903RAUE33/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 precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications markets.
The MAX16903 belongs to Maxim's automotive-grade mini-buck converter family, engineered specifically for high-input-voltage, low-quiescent-current power rails in space-constrained vehicle subsystems.
FAQ
What is the output voltage of the MAX16903RAUE33/V+?
The MAX16903RAUE33/V+ delivers a factory-trimmed fixed output voltage of 3.3V with ±2.5% accuracy over full load (0–1A) and temperature (-40°C to +125°C). This value is confirmed in the Selector Guide and Electrical Characteristics table under VOUT,3.3V conditions. The "/V+" suffix indicates AEC-Q100 qualification and RoHS compliance, while "RAUE" denotes the 16-pin TSSOP-EP package with spread-spectrum disabled.
Does the MAX16903RAUE33/V+ support synchronization to an external clock?
Yes, the MAX16903RAUE33/V+ supports external clock synchronization via its SYNC pin, which accepts input frequencies from 1.8MHz to 2.6MHz. When driven by an external source or tied to the internal BIAS rail, the device enters forced fixed-frequency mode - enabling deterministic EMI behavior and phase alignment with other power supplies. This functionality is documented in the Electrical Characteristics and Detailed Description sections of the datasheet.
What package type does the MAX16903RAUE33/V+ use, and how is thermal performance characterized?
The MAX16903RAUE33/V+ uses a 16-pin TSSOP-EP package (5mm × 4.4mm) with exposed thermal pad. Its thermal performance is specified as θJA = 38.3°C/W and θJC = 3°C/W on a four-layer JEDEC-standard board. The exposed pad must be soldered to PGND and connected via multiple vias to internal ground planes to achieve rated dissipation - details are provided in the Package Thermal Characteristics and PCB Layout Guidelines sections.
Is the MAX16903RAUE33/V+ qualified for automotive applications?
Yes, the MAX16903RAUE33/V+ is AEC-Q100 qualified (Grade 1) and rated for operation from -40°C to +125°C ambient temperature. The "/V+" suffix explicitly denotes automotive qualification, including stress testing for temperature cycling, humidity, and mechanical shock. It also tolerates +42V input transients and supports cold-crank down to +3.5V - meeting ISO 16750-2 requirements for automotive electrical systems.
How does the MAX16903RAUE33/V+ manage efficiency at light loads?
The MAX16903RAUE33/V+ achieves ultra-low 25μA quiescent current in skip mode by disabling non-essential circuitry (including the high-voltage LDO) when output current falls below 5mA. Below this threshold, it enters standby mode - maintaining regulation while minimizing battery drain. This behavior is enabled automatically when SYNC is grounded or floating, and is validated across the full -40°C to +125°C range per the Typical Operating Characteristics plots.
MAX16903RAUE33/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):
- 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
MAX16903RAUE33/V+ FAQ
1.How can I place an order for MAX16903RAUE33/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16903RAUE33/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 MAX16903RAUE33/V+ reliable?
The price and inventory of MAX16903RAUE33/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16903RAUE33/V+ is usually 5 days.
3.What payment methods are accepted for MAX16903RAUE33/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16903RAUE33/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16903RAUE33/V+?
MAX16903RAUE33/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16903RAUE33/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 MAX16903RAUE33/V+?
For technical support, including MAX16903RAUE33/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16903RAUE33/V+ requirements.
6.How does Aetrix verify that MAX16903RAUE33/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16903RAUE33/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 MAX16903RAUE33/V+ meets industry standards.
7.What is the process for return or replacement of MAX16903RAUE33/V+?
All MAX16903RAUE33/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16903RAUE33/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 MAX16903RAUE33/V+ part is unused and in its original packaging.
Return procedure for MAX16903RAUE33/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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