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Analog Devices Inc./Maxim Integrated MAX16909RAUE+TCFZ
- Part No.:
- MAX16909RAUE+TCFZ
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16909RAUE+TCFZ.pdf
- Description:
- IC REG BUCK ADJ/1V 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,703
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Product details
Overview
MAX16909RAUE+TCFZ from Maxim Integrated is a 3A, current-mode, automotive-grade step-down DC-DC converter with integrated 70mΩ high-side MOSFET, operating from 3.5V to 36V input and delivering 5V fixed or 1V–10V adjustable output. It features 30µA standby current, 220kHz–1MHz resistor-programmable switching frequency, and operates across –40°C to +125°C for engine control units and ADAS power rails.
For engineers reviewing the MAX16909RAUE+TCFZ datasheet, MAX16909RAUE+TCFZ pinout, MAX16909RAUE+TCFZ application, or MAX16909RAUE+TCFZ equivalent, key selection criteria include its 42V transient tolerance, skip-mode light-load efficiency, PGOOD monitoring, thermal shutdown with 15°C hysteresis, and TQFN-16 (5mm × 5mm) exposed-pad package compatibility with automotive PCB layouts.
Technical Context
The MAX16909RAUE+TCFZ implements constant-frequency current-mode control with internal transconductance error amplifier (gm = 900µS), 110ns minimum on-time, and 98% max duty cycle during cold-crank undervoltage events. Its dual-supply architecture separates SUP (bias regulator input) and SUPSW (high-side switch supply), enabling stable operation down to 3.5V while tolerating 42V load-dump transients.
It supports external clock synchronization via FSYNC (10% higher than internal fSW required), uses BST–LX bootstrap capacitor for gate drive, and enters skip mode below 300mA load to reduce quiescent current to 30µA - with VOUT supplied from internal BIAS (5V ±5%) or directly from output during standby when VOUT = 3V–5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports wide automotive battery range including cold-crank (≥3.5V) and ISO 7637-2 pulse 5a (42V transient) |
| Output Current | 3A continuous - sustains full load at 125°C ambient with TQFN thermal resistance θJA = 35°C/W |
| Switching Frequency | 220kHz to 1MHz - set by RFOSC resistor; enables trade-off between inductor size (↑f → ↓L), core loss (↑f → ↑loss), and EMI filtering |
| Quiescent Current | 30µA at no load - enables always-on systems (e.g., CAN wake-up circuits) without excessive battery drain |
| Output Voltage Options | 5V fixed (FB tied to BIAS) or 1V–10V adjustable (via resistive divider) - supports MCU core, I/O, and sensor rail flexibility |
| Protection Features | Overcurrent (ILX limit 3.4–6A), overvoltage (110% VFB trip), thermal shutdown (+175°C, 15°C hysteresis), and short-circuit - autonomous recovery without host intervention |
| Power-Good Accuracy | PGOOD asserts at 92.5% VFB, deasserts at 95% VFB - provides precise sequencing margin for downstream logic and ADC references |
Pinout & Package
MAX16909RAUE+TCFZ is housed in a 16-pin TQFN package (5mm × 5mm, 0.5mm pitch) with exposed thermal pad (EP) requiring connection to a large-area ground plane. Pin numbering follows top-view orientation per Maxim's standard TQFN layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FSYNC) | External clock sync input | Accepts CMOS-level signal ≥10% above internal fSW; enables deterministic EMI reduction in multi-rail systems |
| 2 (FOSC) | Frequency-setting resistor node | Connects to GND via RFOSC (e.g., 65kΩ → 400kHz); sets oscillator timing without trimming components |
| 3 (PGOOD) | Open-drain power-good monitor | Signals regulation status with 10–60µs debounce; drives microcontroller reset or enable lines directly |
| 4 (OUT) | Switch-node output | Delivers regulated voltage; supplies internal circuitry in standby when VOUT = 3–5.5V, reducing bias current draw |
| 5 (FB) | Feedback reference input | 1.0V ±1.5% reference; tied to BIAS for 5V fixed output or to resistive divider for adjustable outputs |
| 6 (COMP) | Error amplifier output | Connects RC compensation network (e.g., 47kΩ + 2.7nF) to stabilize loop with ceramic output capacitors |
| 7 (BIAS) | 5V linear regulator output | Powers internal logic; requires 1µF ceramic bypass to GND; regulates independently of VOUT |
| 8 (GND) | Analog/digital ground | Primary return path; EP must be connected to same ground plane for thermal and noise integrity |
| 9 (BST) | Bootstrap supply for high-side driver | Requires 0.1µF ceramic capacitor between BST and LX; enables efficient 70mΩ MOSFET gate drive |
| 10 (SUP) | Bias regulator input | Supplies internal LDO; requires ≥4.7µF ceramic input cap; decoupled separately from SUPSW |
| 11–12 (LX) | Switching node | Connects to inductor and Schottky freewheel diode cathode; high dv/dt node requiring tight layout |
| 13–14 (SUPSW) | High-side switch supply | Directly powers internal MOSFET driver; requires 0.1µF + 4.7µF local decoupling for transient current delivery |
| 15 (EN) | Enable input | 3.3V-tolerant logic interface; pulls device into 5µA shutdown when low; compatible with KL30/KL15 automotive signals |
| 16 (I.C.) | Internally connected | Must be tied to GND; not functional but required for mechanical and thermal integrity |
| EP | Exposed thermal pad | Not electrically active; soldered to solid copper pour for θJC = 2.7°C/W and junction temperature control |
Key Features
| Feature | Design Value |
|---|---|
| 42V transient tolerance | Withstands ISO 7637-2 Pulse 5a load-dump events without derating or external clamping |
| 98% max duty cycle | Maintains regulation during cold-crank (e.g., 5V battery dip) by extending on-time beyond typical buck limits |
| 30µA standby current | Enables >1-year battery life in always-on telematics modules with 10Ah lead-acid battery |
| Fast load-transient response | Recovers from 0.5A→3A step within 100µs (AC-coupled VOUT ripple <200mV) due to current-mode architecture + optimized loop gain |
| Integrated 3A high-side switch | Eliminates external MOSFET, driver, and bootstrap components - reduces BOM count and layout area by ~35% |
| Power-good with 2.5% window | Provides clean, debounced sequencing signal for FPGA configuration or microcontroller boot validation |
Applications
| Engine Control Unit (ECU) Power | Advanced Driver Assistance Systems (ADAS) |
|---|---|
Use Scenario: Supplies 5V/3A to microcontroller, CAN transceiver, and analog sensors in under-hood ECU modules exposed to –40°C to +125°C ambient and 42V transients. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, sequenced, and monitored 5V rail with cold-crank support. Use Value: Eliminates need for external TVS and discrete high-voltage MOSFET, reducing solution size by 28% vs. discrete controller + FET designs. | Use Scenario: Powers radar SoC, camera ISP, and Ethernet PHY in front-camera or surround-view modules requiring low-noise, fast-transient 3.3V or 1.8V rails. IC Role / Device Role / Timing Role: Point-of-load (POL) converter with adjustable output and PGOOD for system-level power sequencing. Use Value: Skip-mode operation achieves >85% efficiency at 10mA load, extending runtime in parking-mode vision systems. |
| Infotainment Head Unit | Industrial Vehicle Telematics |
Use Scenario: Generates 5V for display backlight drivers and USB peripherals in dashboard head units subject to repeated ignition cycling and load dumps. IC Role / Device Role / Timing Role: Main DC-DC stage with EN controlled by ignition signal and PGOOD used for display enable timing. Use Value: 8.5ms soft-start prevents inrush current tripping fuse during cold start; 5µA shutdown current avoids battery drain during vehicle off-state. | Use Scenario: Provides 5V/3A to LTE modem, GNSS receiver, and CAN FD gateway in fleet-tracking devices deployed in trucks and construction equipment. IC Role / Device Role / Timing Role: Robust primary power supply with thermal shutdown and overvoltage protection for unattended remote operation. Use Value: Exposed pad and TQFN package ensure reliable thermal performance in sealed enclosures with limited airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQWR | 4.5V–36V input, 8A output, 2.1MHz fixed fSW, no FSYNC, 15µA IQ | Higher current, higher frequency, no synchronization - better for compact, high-power apps; lacks cold-crank duty-cycle extension | Select LM61480RQWR when >3A output or smaller inductors are needed; avoid if 42V transient immunity or 98% duty cycle is required. |
| TPS650361ARSLR | 3V–36V input, dual 3A/2A outputs, integrated LDOs, I²C programmability, 25µA IQ | Multi-rail PMIC with digital control - adds complexity and cost; no skip mode, lower transient response vs. current-mode | Select TPS650361ARSLR only when multiple synchronized rails and programmability justify added BOM and firmware overhead. |
Compared with LM61480RQWR and TPS650361ARSLR, MAX16909RAUE+TCFZ delivers superior cold-crank resilience (98% duty cycle), deterministic EMI control (FSYNC), and automotive-qualified thermal performance (–40°C to +125°C) in a minimal 5mm × 5mm footprint - making it optimal for single-rail, space-constrained, high-reliability automotive subsystems.
Availability
MAX16909RAUE+TCFZ is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera power, and industrial telematics requiring stable component supply with AEC-Q100 qualification and long-term production continuity.
Supply support for MAX16909RAUE+TCFZ 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 MAX16909 product line targets automotive power conversion with emphasis on high-voltage resilience, ultra-low quiescent current, and extended temperature operation - specifically engineered for ECU, body control, and ADAS subsystems where reliability under harsh electrical conditions is critical.
FAQ
What is the maximum input voltage transient the MAX16909RAUE+TCFZ can withstand?
The MAX16909RAUE+TCFZ withstands 42V input transients for up to 1 second, complying with ISO 7637-2 Pulse 5a load-dump requirements. This rating is validated under absolute maximum conditions and does not require external TVS diodes in standard automotive deployments. The device continues regulation during the event due to its high-duty-cycle capability and robust internal MOSFET structure. MAX16909RAUE+TCFZ maintains functionality without latch-up or parameter shift when exposed to this stress level.
How does the MAX16909RAUE+TCFZ achieve 30µA quiescent current in standby mode?
The MAX16909RAUE+TCFZ achieves 30µA standby current by entering skip mode, where most internal circuitry (including the BIAS LDO) is powered from VOUT instead of SUP/SUPSW when VOUT is between 3V and 5.5V. This eliminates bias current draw from the high-voltage input rail. The device remains responsive to load steps and resumes PWM operation within microseconds. MAX16909RAUE+TCFZ maintains this low-IQ state across the full –40°C to +125°C temperature range without calibration or external components.
Can the MAX16909RAUE+TCFZ operate with a 5V fixed output without external resistors?
Yes, the MAX16909RAUE+TCFZ supports 5V fixed output by connecting the FB pin directly to the BIAS pin - no external resistive divider is required. This configuration leverages the internal 1.0V feedback reference and BIAS's 5V output to establish precise 5V regulation (±1.5% over temperature). MAX16909RAUE+TCFZ simplifies design, reduces BOM count, and improves accuracy compared to resistor-based adjustment, especially in cost-sensitive automotive modules.
What is the purpose of the I.C. pin on the MAX16909RAUE+TCFZ?
The I.C. pin (Pin 16) on the MAX16909RAUE+TCFZ is internally connected and must be tied to GND for proper mechanical mounting, thermal conduction, and electrical stability. It is not functional as an input or output, but leaving it floating violates the recommended layout and may cause thermal or EMI issues. MAX16909RAUE+TCFZ datasheet specifies this connection as mandatory in all operational configurations, including evaluation and production PCBs.
Does the MAX16909RAUE+TCFZ support synchronization to an external clock, and what are the requirements?
Yes, the MAX16909RAUE+TCFZ supports external clock synchronization via the FSYNC pin. The external clock frequency must exceed the internal switching frequency by at least 10% for reliable acquisition, and the signal must meet CMOS logic thresholds (VFSYNC_HI ≥ 1.4V, VFSYNC_LO ≤ 0.4V). Synchronization occurs within one clock cycle. MAX16909RAUE+TCFZ uses this feature to align switching edges across multiple rails, reducing beat frequencies and simplifying EMI filter design in complex automotive ECUs.
MAX16909RAUE+TCFZ 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:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 1V (5V)
- Voltage - Output (Max):
- 10V
- Current - Output:
- 3A
- Frequency - Switching:
- 400kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
MAX16909RAUE+TCFZ FAQ
1.How can I place an order for MAX16909RAUE+TCFZ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16909RAUE+TCFZ 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 MAX16909RAUE+TCFZ reliable?
The price and inventory of MAX16909RAUE+TCFZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16909RAUE+TCFZ is usually 5 days.
3.What payment methods are accepted for MAX16909RAUE+TCFZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16909RAUE+TCFZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16909RAUE+TCFZ?
MAX16909RAUE+TCFZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16909RAUE+TCFZ 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 MAX16909RAUE+TCFZ?
For technical support, including MAX16909RAUE+TCFZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16909RAUE+TCFZ requirements.
6.How does Aetrix verify that MAX16909RAUE+TCFZ is sourced from the original manufacturer or authorized distributors?
All MAX16909RAUE+TCFZ 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 MAX16909RAUE+TCFZ meets industry standards.
7.What is the process for return or replacement of MAX16909RAUE+TCFZ?
All MAX16909RAUE+TCFZ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16909RAUE+TCFZ, 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 MAX16909RAUE+TCFZ part is unused and in its original packaging.
Return procedure for MAX16909RAUE+TCFZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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