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Analog Devices Inc./Maxim Integrated MAX16903RATB18/V+T
- Part No.:
- MAX16903RATB18/V+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX16903RATB18/V+T.pdf
- Description:
- IC REG BUCK 1.8V 1A 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,955
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Product details
Overview
The MAX16903RATB18/V+T from Maxim Integrated is a synchronous buck DC-DC converter with integrated high-side and low-side MOSFETs, delivering 1A output at fixed 1.8V with ±2.0% accuracy over -40°C to +125°C. It operates from 3.5V–28V input, tolerates 42V transients, draws only 25μA quiescent current in skip mode, and runs at 2.1MHz switching frequency-enabling compact automotive power supplies for infotainment and ADAS ECUs.
For engineers reviewing the MAX16903RATB18/V+T datasheet, MAX16903RATB18/V+T pinout, MAX16903RATB18/V+T application, or MAX16903RATB18/V+T equivalent, key selection criteria include its AEC-Q100 qualification, spread-spectrum EMI reduction, dropout operation up to 97% duty cycle, and thermally enhanced 10-pin TDFN-EP (3mm × 3mm) package with exposed pad.
Technical Context
This current-mode buck regulator uses internal slope compensation and requires no external loop compensation. Its 80ns minimum on-time enables stable regulation down to 1.8V output across wide input ranges, while the 97% max duty cycle supports cold-crank operation below 6V input.
The SYNC pin selects among three operating modes: skip mode (25μA IQ), forced PWM (fixed 2.1MHz), or external synchronization (1.8–2.6MHz). Spread-spectrum modulation-enabled on MAX16903RATB18/V+T-is applied only during internally generated switching and shifts frequency +6% to reduce peak EMI without entering the AM band.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2.0% over full temperature and load range-ensures stable core supply for automotive microcontrollers. |
| Input Voltage Range | +3.5V to +28V, with +42V transient tolerance-supports 12V/24V automotive systems through cold-crank and load-dump events. |
| Max Output Current | 1A continuous, with 1.5A peak current limit-sufficient for powering SoCs, sensors, and CAN transceivers. |
| Switching Frequency | 2.1MHz typical, with ±6% spread-spectrum option-enables use of ≤4.7µH inductors and <10µF ceramic output capacitors. |
| Quiescent Current | 25μA in skip mode at no load-meets OEM standby current budgets for always-on vehicle modules. |
| Operating Temperature | -40°C to +125°C ambient-fully qualified for under-hood and dashboard-mounted automotive applications. |
| Package | 10-pin TDFN-EP (3mm × 3mm × 0.75mm) with exposed thermal pad-provides 9°C/W junction-to-case resistance for high-power-density layouts. |
Pinout & Package
MAX16903RATB18/V+T is housed in a thermally enhanced 10-pin TDFN-EP package (3mm × 3mm, 0.75mm height) with exposed pad soldered to PGND for optimal thermal performance. Pin 1 is BST; pin 10 is EN; EP must be connected to PGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 1) | Bootstrap capacitor node | Drives high-side FET gate; requires 0.1µF ceramic capacitor between BST and LX to sustain >97% duty cycle in dropout. |
| SUP (Pin 2) | Main input voltage supply | Accepts 3.5V–28V; connect 4.7µF ceramic capacitor directly to PGND-critical for high-frequency noise suppression. |
| LX (Pin 3) | Switching node | Connects to inductor; high-impedance when off; routing must minimize loop area to reduce EMI and ringing. |
| PGND (Pin 4) | Power ground return | Carries high pulsed currents; tie directly to exposed pad and output capacitor negative terminal-no shared traces with analog GND. |
| OUTS (Pin 5) | Output voltage feedback | High-impedance sense input; bypass with ≥10µF X7R ceramic to PGND for stability and transient response. |
| PGOOD (Pin 6) | Open-drain power-good signal | Asserts high when VOUT ≥93% of nominal; requires external 20kΩ pull-up-used for system sequencing and fault monitoring. |
| SYNC (Pin 7) | Mode control and clock sync | Ground = skip mode; BIAS or external clock = forced PWM; enables dynamic efficiency optimization in real time. |
| BIAS (Pin 8) | Internal 5V logic supply | Provides regulated bias for control circuitry; bypass with 2.2µF ceramic to GND-decouples digital noise from analog sections. |
| GND (Pin 9) | Analog ground reference | Low-noise reference for error amplifier and oscillator; connect to PGND at single point near output capacitor. |
| EN (Pin 10) | Enable input | High-voltage compatible (3.3V–42V logic); no internal pullup-allows direct connection to MCU GPIO or automotive KEY signal. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade-0 qualification | Validated for -40°C to +125°C operation with lifetime reliability testing-meets automotive functional safety prerequisites. |
| Integrated high- and low-side DMOS FETs | RDS(ON) = 400mΩ (HS) / 250mΩ (LS)-eliminates external MOSFETs and gate drivers, reducing BOM count and layout complexity. |
| Spread-spectrum frequency modulation | +6% frequency dither around 2.1MHz-lowers radiated EMI peaks by up to 10dB without affecting regulation or efficiency. |
| Ultra-low 25μA quiescent current | Measured in skip mode at no load-extends battery life in always-on telematics and gateway modules. |
| 97% maximum duty cycle | Enables operation down to 3.5V input while maintaining 1.8V output-critical for cold-crank scenarios in 12V systems. |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
|
Use Scenario: Powers ARM-based SoC cores and DDR memory in head-unit systems requiring stable 1.8V under wide battery fluctuations. IC Role / Device Role / Timing Role: Primary 1.8V buck regulator with PGOOD monitoring for safe boot sequencing and brownout detection. Use Value: 25μA quiescent current prevents parasitic drain during vehicle sleep mode; 42V transient tolerance avoids reset during load dump. |
Use Scenario: Supplies image sensor and ISP in rear-view or surround-view cameras mounted in exterior housings. IC Role / Device Role / Timing Role: Compact, thermally robust 1.8V source with fast transient response to handle burst-mode pixel readout. Use Value: 2.1MHz switching enables small 3.3µH inductor and 10µF ceramic output cap-reducing board area in space-constrained camera PCBs. |
| Body Control Module (BCM) Sub-regulator | Automotive Gateway Microcontroller Core |
|
Use Scenario: Generates clean 1.8V rail for CAN FD transceivers and LIN interface ICs within centralized body controllers. IC Role / Device Role / Timing Role: Secondary buck stage downstream of main 5V/3.3V supply, providing isolated low-noise domain. Use Value: Spread-spectrum EMI reduction ensures compliance with CISPR 25 Class 5 radiated emissions limits near sensitive RF receivers. |
Use Scenario: Delivers regulated 1.8V to dual-core automotive MCUs (e.g., S32K3, TC3xx) in zonal gateways with multiple CAN/Ethernet interfaces. IC Role / Device Role / Timing Role: High-efficiency core supply with soft-start (8ms ramp) and thermal shutdown (175°C) for robust runtime protection. Use Value: AEC-Q100 qualification and -40°C to +125°C operation guarantee uninterrupted function in engine bay or trunk-mounted gateway units. |
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 | 3.5V–36V input, 1A, 2.1MHz, no spread-spectrum, QFN-16 package | Lacks integrated spread-spectrum; higher RDS(ON) (520mΩ HS / 280mΩ LS) | Choose when EMI requirements are less stringent and larger package footprint is acceptable. |
| TPS62933QDRLRQ1 | 3V–18V input, 3A, 2.25MHz, spread-spectrum enabled, 12-pin WQFN | Higher current rating, narrower input range, different pinout and thermal pad layout | Prefer for designs needing >1A or tighter input range; not drop-in due to pin mismatch and layout rework. |
Compared with LM61480QRTWRQ1 and TPS62933QDRLRQ1, the MAX16903RATB18/V+T offers superior cold-crank capability (3.5V min), lower quiescent current (25μA vs. 32μA), and smaller 10-pin TDFN footprint-making it optimal for space- and efficiency-critical automotive subsystems.
Availability
MAX16903RATB18/V+T is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and body control modules requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX16903RATB18/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 high-performance analog and mixed-signal ICs for automotive, industrial, and communications markets-with emphasis on reliability, integration, and power efficiency.
The MAX16903RATB18/V+T belongs to Maxim's automotive-grade mini-buck converter family, engineered specifically for high-input-voltage DC-DC conversion in harsh environments where AEC-Q100 compliance, EMI control, and ultra-low standby power are mandatory.
FAQ
What is the output voltage of the MAX16903RATB18/V+T?
The MAX16903RATB18/V+T delivers a factory-trimmed fixed output voltage of 1.8V with ±2.0% accuracy across -40°C to +125°C ambient temperature and 0–1A load. This value is laser-trimmed during production and does not require external resistive feedback-ensuring consistent performance without calibration.
Does the MAX16903RATB18/V+T include spread-spectrum modulation?
Yes, the MAX16903RATB18/V+T includes optional spread-spectrum frequency modulation, shifting the 2.1MHz switching frequency by +6% to reduce peak radiated EMI. This feature is enabled by default per the Selector Guide and confirmed in the ordering code "/V+" suffix with "SATB" prefix indicating spread-spectrum capability.
What package type is used for the MAX16903RATB18/V+T?
The MAX16903RATB18/V+T is supplied in a 10-pin TDFN-EP package measuring 3mm × 3mm × 0.75mm with an exposed thermal pad. The "T" suffix in the part number confirms tape-and-reel packaging, and the "/V+" denotes AEC-Q100 qualification and RoHS compliance.
How does the MAX16903RATB18/V+T handle cold-crank conditions?
The MAX16903RATB18/V+T maintains regulation during cold-crank by operating at up to 97% duty cycle, allowing functionality down to 3.5V input while sustaining 1.8V output. Its 42V transient tolerance and undervoltage lockout (2.8V–3.2V threshold) prevent malfunction during battery voltage sag and recovery.
Is the MAX16903RATB18/V+T pin-compatible with other MAX16903 variants?
No-while all MAX16903 variants share identical 10-pin TDFN-EP pinouts, the MAX16903RATB18/V+T differs electrically from non-spread-spectrum versions (e.g., MAX16903RATB18+) in EMI behavior and internal oscillator configuration. Layout compatibility is maintained, but system-level EMI validation must be repeated for the spread-spectrum variant.
MAX16903RATB18/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):
- 1.8V
- 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)
MAX16903RATB18/V+T FAQ
1.How can I place an order for MAX16903RATB18/V+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16903RATB18/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 MAX16903RATB18/V+T reliable?
The price and inventory of MAX16903RATB18/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 MAX16903RATB18/V+T is usually 5 days.
3.What payment methods are accepted for MAX16903RATB18/V+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16903RATB18/V+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16903RATB18/V+T?
MAX16903RATB18/V+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16903RATB18/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 MAX16903RATB18/V+T?
For technical support, including MAX16903RATB18/V+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16903RATB18/V+T requirements.
6.How does Aetrix verify that MAX16903RATB18/V+T is sourced from the original manufacturer or authorized distributors?
All MAX16903RATB18/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 MAX16903RATB18/V+T meets industry standards.
7.What is the process for return or replacement of MAX16903RATB18/V+T?
All MAX16903RATB18/V+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16903RATB18/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 MAX16903RATB18/V+T part is unused and in its original packaging.
Return procedure for MAX16903RATB18/V+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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