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Analog Devices Inc./Maxim Integrated MAX16903RATB50/V+T
- Part No.:
- MAX16903RATB50/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX16903RATB50/V+T.pdf
- Description:
- IC REG BUCK 5V 1A 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,335
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Product details
Overview
MAX16903RATB50/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 5.0V from 3.5V–28V input. It operates at 2.1MHz (typ), achieves 25μA quiescent current in skip mode, tolerates +42V transients, and features PGOOD monitoring - ideal for automotive infotainment power rails.
For engineers reviewing the MAX16903RATB50/V+T datasheet, MAX16903RATB50/V+T pinout, MAX16903RATB50/V+T application, or MAX16903RATB50/V+T equivalent, key selection criteria include AEC-Q100 qualification, -40°C to +125°C operation, 10-pin TDFN-EP package, spread-spectrum disable status, and 5V factory-trimmed output voltage.
Technical Context
The MAX16903RATB50/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 5V output even at 18V input, while dropout operation at >97% duty cycle supports cold-crank conditions.
SYNC pin configuration determines operating mode: grounded/unconnected enables skip mode (25μA IQ); driven by BIAS or external clock forces fixed-frequency PWM. Spread-spectrum modulation is disabled per ordering code "RATB", confirming standard 2.1MHz ±6.25% frequency tolerance without spectral spreading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +3.5V to +28V; withstands +42V transients for automotive battery line robustness |
| Output Voltage | Fixed 5.0V ±2.5% over -40°C to +125°C; factory-trimmed, no external feedback required |
| Max Output Current | 1A continuous; peak current limit 1.5A (±15%) with automatic hiccup-mode short-circuit protection |
| Switching Frequency | 2.1MHz typical; guarantees no AM-band interference (1.8–2.6MHz sync range supported) |
| Quiescent Current | 25μA in skip mode; enables compliance with OEM standby current budgets in always-on modules |
| Thermal Rating | AEC-Q100 qualified; operates from -40°C to +125°C ambient; thermal shutdown at +175°C (15°C hysteresis) |
| Package | 10-pin TDFN-EP (3mm × 3mm × 0.75mm); exposed pad soldered to PGND for θJA = 41°C/W |
Pinout & Package
MAX16903RATB50/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; pin 10 is EN; EP must be soldered to a dedicated PGND copper plane using multiple vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 1) | Bootstrap capacitor node | Drives high-side FET gate; requires 0.1µF ceramic cap between BST and LX for proper gate charge replenishment |
| SUP (Pin 2) | Main input supply | Accepts +3.5V to +28V; connect 4.7µF X7R ceramic capacitor directly adjacent to minimize high-frequency ripple |
| LX (Pin 3) | Switching node | Connects to inductor; high-impedance when off; drives both internal FETs; sensitive to layout parasitics |
| PGND (Pin 4) | Power ground return | Carries high di/dt currents; must be tied to EP and output capacitor negative terminal - separate from analog GND |
| OUTS (Pin 5) | Voltage sense input | Monitors regulated 5V output; bypass with ≥10µF X7R ceramic to PGND for stability and transient response |
| PGOOD (Pin 6) | Open-drain power-good flag | Active-high signal pulled low if VOUT < 91%; requires external 20kΩ pull-up to BIAS or system rail |
| SYNC (Pin 7) | Mode control input | GND = skip mode; BIAS or clock = forced PWM; unconnected defaults to skip mode |
| BIAS (Pin 8) | Internal 5V LDO output | Supplies internal logic; bypass with 2.2µF ceramic to GND; can power PGOOD pull-up resistor |
| GND (Pin 9) | Analog ground reference | Low-noise reference for error amplifier and bandgap; tie to PGND only at output capacitor negative terminal |
| EN (Pin 10) | Enable input | High-voltage compatible (3.3V–42V logic); no internal pullup; drive HIGH to activate regulator |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-FET power stage | Eliminates external MOSFETs and drivers; RDS(ON) = 400mΩ (HS) / 250mΩ (LS) reduces conduction loss at 1A |
| Ultra-low quiescent current | 25μA in skip mode enables >10-year battery life in always-on automotive modules (e.g., telematics wake-up circuits) |
| Automotive-grade reliability | AEC-Q100 Grade 1 qualified; validated for -40°C to +125°C ambient; 175°C thermal shutdown with 15°C hysteresis |
| EMI-optimized switching | No spread-spectrum (RATB suffix); 2.1MHz fixed frequency avoids AM band; fast 5ns LX rise time minimizes ringing |
| Robust input handling | Tolerates +42V transients and cold-crank dips to +3.5V; UVLO threshold 3.0V with 0.4V hysteresis prevents brownout oscillation |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers SoC core voltage (5V rail) in head-unit systems requiring cold-crank operation and low standby draw. IC Role / Device Role / Timing Role: Primary 5V buck regulator with PGOOD sequencing and transient immunity. Use Value: Maintains regulation during 3.5V battery dips; 25μA IQ meets OEM <50μA module sleep spec; AEC-Q100 ensures field reliability. |
Use Scenario: Supplies image sensor and ISP in rear-view camera modules exposed to engine bay temperature extremes. IC Role / Device Role / Timing Role: High-efficiency 5V point-of-load converter with thermal shutdown and EMI control. Use Value: Operates continuously at +125°C ambient; 2.1MHz switching allows compact 4.7µH inductor; exposed pad dissipates heat into PCB. |
| Industrial Control I/O Power | Telematics Cellular Modem Rail |
Use Scenario: Generates isolated 5V for PLC digital I/O modules powered from 24V industrial bus with surge exposure. IC Role / Device Role / Timing Role: Input-transient-hardened buck regulator with overcurrent and thermal fault protection. Use Value: Withstands +42V surges per IEC 61000-4-5; hiccup-mode OCP prevents latch-up during field wiring faults. |
Use Scenario: Powers LTE modem in vehicle tracking units requiring ultra-low sleep current and rapid wake-up. IC Role / Device Role / Timing Role: Low-IQ buck converter with enable-controlled sequencing and PGOOD handshake. Use Value: 25μA skip-mode IQ extends GPS/Cellular backup battery life; EN pin accepts 3.3V MCU control without level shifters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQR | 3.5V–36V input, 5V fixed output, 8-pin WSON, 2.1MHz, 25μA IQ, no AEC-Q100 | Industrial temp only (-40°C to +125°C not automotive-qualified); lacks PGOOD and SYNC flexibility | Select for cost-sensitive non-automotive designs where AEC-Q100 is not mandated |
| TPS62933RTER | 3V–18V input, 5V fixed, 12-pin QFN, 2.5MHz, 15μA IQ, AEC-Q100 Grade 1, spread-spectrum enabled | Narrower input range excludes cold-crank support; higher frequency demands tighter layout; includes spread-spectrum | Choose when lower IQ and EMI reduction outweigh need for 28V max input and +42V transient tolerance |
Compared with LM61480RQR and TPS62933RTER, the MAX16903RATB50/V+T uniquely combines AEC-Q100 qualification, +42V transient tolerance, cold-crank capability, and PGOOD signaling in a 10-pin TDFN - making it the only drop-in solution for safety-critical automotive 5V rails requiring full automotive validation.
Availability
MAX16903RATB50/V+T is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, industrial control I/O, and telematics cellular modem power supplies requiring stable component supply across extended temperature and automotive qualification requirements.
Supply support for MAX16903RATB50/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, emphasizing high-reliability and AEC-Q100-compliant solutions.
The MAX16903RATB50/V+T belongs to Maxim's automotive-grade mini-buck converter family, engineered specifically for high-input-voltage DC-DC conversion in space-constrained, thermally demanding automotive subsystems.
FAQ
What is the output voltage accuracy of the MAX16903RATB50/V+T over temperature?
The MAX16903RATB50/V+T delivers 5.0V 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 room temperature, accuracy tightens to ±2.0%. This is achieved via factory trimming and internal bandgap reference stability - no external resistors are needed for the fixed 5V output.
Does the MAX16903RATB50/V+T support synchronization to an external clock?
Yes, the MAX16903RATB50/V+T supports external clock synchronization via its SYNC pin. When driven by a clean square wave within 1.8MHz–2.6MHz, the device locks to the external frequency and operates in forced PWM mode. This feature enables EMI reduction through frequency alignment and eliminates beat frequencies in multi-rail systems.
What is the thermal performance of the MAX16903RATB50/V+T in its 10-pin TDFN-EP package?
The MAX16903RATB50/V+T in the 10-pin TDFN-EP package has a junction-to-ambient thermal resistance (θJA) of 41°C/W on a standard 4-layer JEDEC board. With its exposed pad soldered to a 1-in² PGND copper area and 4 thermal vias, it sustains 1A continuous output at +125°C ambient without derating - verified per AEC-Q100 thermal test conditions.
How does the MAX16903RATB50/V+T handle cold-crank conditions?
The MAX16903RATB50/V+T maintains regulation during cold-crank events by operating in dropout mode at >97% duty cycle when input falls below ~6.5V. Its undervoltage lockout (UVLO) activates at 3.0V with 0.4V hysteresis, preventing oscillation. The device tolerates input dips to +3.5V while delivering full 1A at 5V - confirmed in typical operating characteristics Figure toc10.
Is spread-spectrum frequency modulation enabled on the MAX16903RATB50/V+T?
No, spread-spectrum frequency modulation is disabled on the MAX16903RATB50/V+T. The "RATB" ordering suffix indicates the standard version without spread-spectrum; only "SATB" variants include this feature. This ensures deterministic 2.1MHz ±6.25% switching with no spectral dithering - critical for EMI testing predictability in automotive EMC validation.
MAX16903RATB50/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:
- Obsolete
- 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:
- 10-TDFN (3x3)
MAX16903RATB50/V+T FAQ
1.How can I place an order for MAX16903RATB50/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16903RATB50/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 MAX16903RATB50/V+T reliable?
The price and inventory of MAX16903RATB50/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 MAX16903RATB50/V+T is usually 5 days.
3.What payment methods are accepted for MAX16903RATB50/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16903RATB50/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16903RATB50/V+T?
MAX16903RATB50/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16903RATB50/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 MAX16903RATB50/V+T?
For technical support, including MAX16903RATB50/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16903RATB50/V+T requirements.
6.How does Aetrix verify that MAX16903RATB50/V+T is sourced from the original manufacturer or authorized distributors?
All MAX16903RATB50/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 MAX16903RATB50/V+T meets industry standards.
7.What is the process for return or replacement of MAX16903RATB50/V+T?
All MAX16903RATB50/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16903RATB50/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 MAX16903RATB50/V+T part is unused and in its original packaging.
Return procedure for MAX16903RATB50/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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