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Analog Devices Inc./Maxim Integrated MAX16903RATB33/V+T
- Part No.:
- MAX16903RATB33/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX16903RATB33/V+T.pdf
- Description:
- IC REG BUCK 3.3V 1A 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,956
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Product details
Overview
The MAX16903RATB33/V+T 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 tolerating +42V transients. It features 2.1MHz switching frequency, 25μA quiescent current in skip mode, PGOOD monitoring, and AEC-Q100 qualification for automotive power rails.
For engineers reviewing the MAX16903RATB33/V+T datasheet, MAX16903RATB33/V+T pinout, MAX16903RATB33/V+T application, or MAX16903RATB33/V+T equivalent, this page provides verified package mapping (10-pin TDFN-EP), confirmed thermal performance (θJA = 41°C/W), validated pin functions including BST, SUP, LX, and EN, and real-world EMI mitigation via spread-spectrum option and 97% dropout duty cycle.
Technical Context
The MAX16903RATB33/V+T uses current-mode control with internal slope compensation and requires no external loop compensation. Its 80ns minimum on-time enables stable regulation down to 3.3V output even at 18V input, while the 97% maximum duty cycle sustains operation during cold-crank conditions below 3.5V input.
SYNC pin logic determines operational mode: grounded or floating enables skip mode (25μA IQ); driven by BIAS or external clock forces fixed-frequency PWM (2.1MHz ±6.5%). The device integrates a +5V bias LDO, undervoltage lockout (3.0V typ), and thermal shutdown at 175°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.5% over -40°C to +125°C, enabling direct replacement of linear regulators in automotive infotainment power rails. |
| Input Voltage Range | +3.5V to +28V continuous, +42V transient tolerance - supports 12V/24V automotive systems through load dump and cold-crank events. |
| Switching Frequency | 2.1MHz typical (1.925–2.275MHz), allowing use of ≤4.7µH inductors and <10µF ceramic output capacitors to minimize board area. |
| Quiescent Current | 25μA in skip mode at no load - meets OEM standby current budgets for always-on vehicle modules. |
| Output Current | 1A continuous, peak current limit 1.5A ±15% - supports microcontroller cores, CAN transceivers, and sensor interfaces without external current sensing. |
| Package | 10-pin TDFN-EP (3mm × 3mm × 0.75mm) with exposed pad soldered to PGND - achieves θJA = 41°C/W for thermally constrained engine bay layouts. |
| Temperature Range | -40°C to +125°C ambient, AEC-Q100 Grade 0 qualified - validated for under-hood placement in ADAS camera modules and body control units. |
Pinout & Package
MAX16903RATB33/V+T is housed in a thermally enhanced 10-pin TDFN-EP package (3mm × 3mm, 0.75mm height) with exposed pad connected to PGND. Pin 1 is BST; pins are numbered counterclockwise from top-left corner in top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor node for high-side gate driver | Requires 0.1µF ceramic capacitor to LX; critical for maintaining >97% duty cycle in dropout - failure causes output collapse below 3.5V input. |
| SUP | Main input voltage supply (3.5–28V) | Connect 4.7µF ceramic capacitor directly to PGND; placement within 2mm of pin essential to suppress 2.1MHz switching noise on input rail. |
| LX | Switching node between high- and low-side FETs | Drives external inductor; high dv/dt node requiring shortest possible trace to minimize EMI radiation and gate ringing. |
| PGND | Power ground return for high-current paths | Must be tied to exposed pad and output capacitor negative terminal - separates noisy power return from analog GND to prevent PGOOD false triggering. |
| OUTS | Feedback voltage sense input | Monitors regulated 3.3V output via resistor divider or direct connection; bypass with ≥10µF X7R ceramic to PGND for stability across temperature. |
| PGOOD | Open-drain power-good status signal | Pulls low when VOUT falls below 91% of 3.3V (3.003V); requires 20kΩ pull-up to BIAS or external 3.3V rail for system power sequencing. |
| SYNC | Mode selection and synchronization input | Grounded → skip mode; driven by BIAS or external clock → forced PWM; unconnected defaults to skip - enables dynamic efficiency optimization. |
| BIAS | +5V internal logic supply output | Provides regulated 5V for SYNC pull-up and external circuitry; bypass with 2.2µF ceramic to GND to maintain clean reference for internal comparators. |
| GND | Analog ground reference | Must connect only to clean analog ground plane; tie to PGND at single point near OUTS capacitor to avoid ground bounce affecting feedback accuracy. |
| EN | Enable input with high-voltage compatibility | Accepts 3.3V–42V logic levels; no internal pullup - allows direct interface with automotive KEY signals or microcontroller GPIO without level-shifting. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck architecture | Integrated 400mΩ high-side and 250mΩ low-side DMOS FETs eliminate external diode losses, achieving >90% efficiency at 500mA load with 12V input. |
| Automotive-grade reliability | AEC-Q100 Grade 0 qualification, +42V transient tolerance, and -40°C to +125°C operation enable deployment in engine control units without derating. |
| EMI-optimized switching | 2.1MHz fundamental frequency avoids AM band (530–1710kHz); optional spread-spectrum modulation reduces peak radiated emissions by 10dB. |
| Dropout operation | 97% maximum duty cycle maintains 3.3V output during cold-crank events down to 3.5V input - eliminates need for pre-regulator stages. |
| Intelligent light-load management | Three-mode operation (skip, forced PWM, sync) automatically selects optimal mode: skip mode for <5mA loads (25μA IQ), forced PWM for noise-sensitive applications. |
Applications
| Infotainment Power Supply | ADAS Camera Module |
|---|---|
|
Use Scenario: Powering SoC core voltage (3.3V) and display interface in automotive head units with variable battery input (9–16V). IC Role / Device Role / Timing Role: Primary 3.3V buck regulator providing clean, sequenced power with PGOOD confirmation before SoC boot. Use Value: 25μA quiescent current extends battery life during vehicle sleep mode; 2.1MHz switching allows compact 3.3×3.3mm layout alongside DDR memory. |
Use Scenario: Generating 3.3V rail for image sensor, ISP, and MIPI transmitter in front-facing collision avoidance cameras. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with fast transient response (<200µs recovery from 100mA→1A load step) to maintain sensor timing integrity. Use Value: 97% dropout capability ensures uninterrupted operation during engine start; spread-spectrum option meets CISPR 25 Class 5 radiated emissions limits. |
| Body Control Unit (BCU) | Telematics Control Unit (TCU) |
|
Use Scenario: Supplying 3.3V to LIN transceivers, door lock actuators, and ambient light sensors in centralized vehicle body electronics. IC Role / Device Role / Timing Role: Robust power source tolerant of load dump (42V/100ms) and reverse battery (-14V) with integrated overcurrent and thermal protection. Use Value: AEC-Q100 qualification eliminates requalification effort; TDFN-EP package enables high-density placement on multi-layer BCU PCBs with minimal thermal vias. |
Use Scenario: Providing 3.3V for cellular modem, GNSS receiver, and CAN FD controller in connected vehicle telematics gateways. IC Role / Device Role / Timing Role: Low-noise power stage synchronized to system clock via SYNC pin to prevent beat frequencies with RF front-end LO signals. Use Value: Forced PWM mode eliminates subharmonic noise in sensitive RF bands; PGOOD signal coordinates secure boot sequence with modem firmware. |
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 | 3.3V fixed output, 2.1MHz, 1A, but requires external compensation and lacks spread-spectrum option. | Higher BOM cost due to required compensation network; less effective EMI suppression in congested RF environments. | Select when design requires TI's WEBENCH support or existing LM61480-based platform reuse. |
| TPS62933QDBVRQ1 | 3.3V fixed output, 2.25MHz, 1A, with lower 15μA quiescent current but no +42V transient rating. | Not suitable for direct replacement in cold-crank–critical locations; requires upstream TVS protection for load dump. | Select for cabin-domain applications where input never exceeds 28V and ultra-low IQ is prioritized over ruggedness. |
Compared with LM61480QRTWRQ1 and TPS62933QDBVRQ1, the MAX16903RATB33/V+T uniquely combines AEC-Q100 Grade 0, +42V transient tolerance, integrated spread-spectrum, and zero-compensation design - reducing validation time and component count in safety-critical automotive power rails.
Availability
MAX16903RATB33/V+T is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and body control units requiring stable component supply across extended temperature and high-reliability automotive lifecycles.
Supply support for MAX16903RATB33/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 with focus on high-reliability, low-power, and small-footprint solutions.
The MAX16903 product line delivers high-voltage synchronous buck converters optimized for automotive power rails - addressing cold-crank resilience, EMI compliance, and AEC-Q100 qualification requirements in space-constrained ECUs.
FAQ
What is the exact output voltage tolerance of the MAX16903RATB33/V+T over temperature?
The MAX16903RATB33/V+T delivers 3.3V output with ±2.5% accuracy across the full -40°C to +125°C automotive temperature range under 6V–18V input and 0–1A load. At 25°C, the tolerance tightens to ±2.0%, and skip-mode operation adds up to +4% upper bound - all values confirmed in the Electrical Characteristics table on page 3 of the official datasheet.
Does the MAX16903RATB33/V+T include spread-spectrum frequency modulation?
No, the MAX16903RATB33/V+T does not include spread-spectrum modulation. Per the Selector Guide, only parts with "SATB" prefix (e.g., MAX16903SATB33/V+) have this feature enabled. The "RATB" variant uses fixed 2.1MHz operation, which still avoids AM band interference due to its 1.925–2.275MHz range.
What is the recommended inductor value for the MAX16903RATB33/V+T in a typical 12V-to-3.3V application?
For 3.3V output, Table 1 specifies LNOM = VOUT/0.96 = 3.44µH. The Selector Guide example shows 3.3µH as the standard value used for 3.3V variants. A 3.3µH, 1.5A saturation current shielded inductor with ≤30mΩ DCR is recommended - matching the typical operating circuit on page 2 of the datasheet.
How does the MAX16903RATB33/V+T handle cold-crank conditions below 3.5V input?
The MAX16903RATB33/V+T sustains regulation during cold-crank by operating at 97% duty cycle, turning off the high-side FET every 6.5µs to recharge the BST capacitor. This produces an effective 150kHz switching frequency in dropout, maintaining 3.3V output as long as input stays above the UVLO threshold of 2.8V (min).
Is the MAX16903RATB33/V+T pin-compatible with other MAX16903 variants in the same package?
Yes, all MAX16903 variants in the 10-pin TDFN-EP package - including MAX16903RATB50/V+, MAX16903RATB18/V+, and MAX16903SATB33/V+ - share identical pinout, footprint, and thermal pad layout. Only the output voltage and spread-spectrum option differ; no PCB redesign is needed when substituting within the R-series TDFN family.
MAX16903RATB33/V+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN 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):
- 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:
- 10-TDFN (3x3)
MAX16903RATB33/V+T FAQ
1.How can I place an order for MAX16903RATB33/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16903RATB33/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 MAX16903RATB33/V+T reliable?
The price and inventory of MAX16903RATB33/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 MAX16903RATB33/V+T is usually 5 days.
3.What payment methods are accepted for MAX16903RATB33/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16903RATB33/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16903RATB33/V+T?
MAX16903RATB33/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16903RATB33/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 MAX16903RATB33/V+T?
For technical support, including MAX16903RATB33/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16903RATB33/V+T requirements.
6.How does Aetrix verify that MAX16903RATB33/V+T is sourced from the original manufacturer or authorized distributors?
All MAX16903RATB33/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 MAX16903RATB33/V+T meets industry standards.
7.What is the process for return or replacement of MAX16903RATB33/V+T?
All MAX16903RATB33/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16903RATB33/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 MAX16903RATB33/V+T part is unused and in its original packaging.
Return procedure for MAX16903RATB33/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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