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Analog Devices Inc./Maxim Integrated MAX16909RAUE+T
- Part No.:
- MAX16909RAUE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16909RAUE+T.pdf
- Description:
- IC REG BUCK ADJ/1V 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,222
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Product details
Overview
MAX16909RAUE+T 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 no-load quiescent current, 220kHz–1MHz resistor-programmable switching frequency, and operates across –40°C to +125°C for engine bay and ADAS power rail applications.
For engineers reviewing the MAX16909RAUE+T datasheet, MAX16909RAUE+T pinout, MAX16909RAUE+T application, or MAX16909RAUE+T equivalent, key selection criteria include its 42V transient tolerance, skip-mode light-load efficiency, PGOOD monitoring, thermal/overvoltage/overcurrent protection, and compatibility with cold-crank (high-duty-cycle) operation in automotive systems.
Technical Context
The MAX16909RAUE+T implements constant-frequency current-mode control with internal transconductance error amplifier (gm = 900µS), 110ns minimum on-time, and fast load-transient response enabled by integrator architecture enhancements. Its dual supply inputs (SUP and SUPSW) decouple bias and switch drive paths, enabling stable regulation during undervoltage transients down to 3.5V while maintaining up to 99% duty cycle.
It integrates a 5V BIAS LDO (4.7–5.5V output, ±100mV line/load regulation), programmable oscillator with external resistor (RFOSC) or FSYNC synchronization, and soft-start with 8.5ms ramp. Protection includes overvoltage trip at 110% VFB, thermal shutdown at +175°C with 15°C hysteresis, and automatic-recovery current limiting.
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 load-dump (42V transient) |
| Output Current | 3A continuous - sufficient for powering microcontrollers, sensors, and CAN transceivers in vehicle ECUs |
| Quiescent Current | 30µA at no load - enables always-on subsystems without excessive battery drain |
| Switching Frequency | 220kHz to 1MHz - adjustable via RFOSC resistor; higher frequencies reduce inductor size and output capacitance |
| Output Voltage Options | 5V fixed (FB tied to BIAS) or 1V–10V adjustable (via external resistive divider) - flexible for diverse SoC and peripheral rails |
| High-Side RDS(on) | 70mΩ typical - minimizes conduction loss and thermal stress at full 3A load |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive environments per AEC-Q100 stress requirements |
Pinout & Package
MAX16909RAUE+T is housed in a 16-pin TSSOP package (4.4mm × 5mm, 0.65mm pitch) with exposed pad for thermal dissipation. Pin mapping is identical to the TQFN variant per datasheet Figure 1 and Pin Descriptions table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FSYNC) | Synchronization input | Accepts external clock ≥10% above internal frequency; enables EMI reduction via spread-spectrum or system-level timing alignment |
| 2 (FOSC) | Oscillator programming node | Resistor-to-GND sets switching frequency; 65kΩ yields ~400kHz, enabling compact magnetics design |
| 3 (PGOOD) | Open-drain power-good monitor | Asserts low when VOUT drops below 92.5% of target; used for supply sequencing and fault detection |
| 4 (OUT) | Switch regulator output | Delivers regulated voltage; powers internal circuitry when VOUT = 3–5V in standby mode |
| 5 (FB) | Feedback input | Connect to BIAS for 5V fixed output; connect to resistive divider for adjustable output (VFB = 1.0V ±1.5%) |
| 6 (COMP) | Error amplifier output | External RC network (e.g., 47kΩ + 2.7nF) provides loop compensation for ceramic-output stability |
| 7 (BIAS) | Integrated 5V LDO output | Bypassed with 1µF ceramic; powers internal logic and gate drivers; regulates independently of OUT |
| 8 (GND) | Analog/digital ground reference | Primary return path; must be connected to large copper plane; EP (exposed pad) is separate thermal ground |
| 9 (BST) | Bootstrap supply for high-side driver | Requires 0.1µF capacitor between BST and LX; enables efficient high-side MOSFET gate drive |
| 10 (SUP) | Main supply input | Powers internal LDO and logic; requires ≥4.7µF ceramic decoupling to GND |
| 11–12 (LX) | Switch node | Connects to inductor and Schottky freewheel diode cathode; high dv/dt node requiring short PCB routing |
| 13–14 (SUPSW) | High-side switch supply | Powers internal MOSFET driver; requires 0.1µF + 4.7µF decoupling; tolerant to undervoltage during cold crank |
| 15 (EN) | Enable input | Logic-compatible with 3.3V/5V/KL30; high-voltage tolerant (up to 42V); asserts internal regulator and soft-start |
| 16 (I.C.) | Internally connected | Must be tied to GND; not functional; serves internal test or trimming purpose |
| EP | Exposed thermal pad | Connected to GND plane for thermal management; required for 2.08W power dissipation at +70°C ambient |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range with 42V transient tolerance | Enables direct connection to automotive battery without pre-regulator; survives ISO 7637-2 pulse 5a (load dump) |
| 30µA standby current | Reduces parasitic drain in always-on domains (e.g., body control modules, telematics wake-up circuits) |
| Adjustable switching frequency (220kHz–1MHz) | Permits optimization for EMI compliance (lower fSW) or miniaturization (higher fSW with smaller L/C) |
| Integrated 3A high-side switch (70mΩ typ) | Eliminates external MOSFET and driver, reducing BOM count and layout complexity for space-constrained ECUs |
| Power-good (PGOOD) output with hysteresis | Provides clean, debounced signal for FPGA/CPU reset sequencing and system-level fault reporting |
| Thermal shutdown with 15°C hysteresis | Prevents latch-up during overload; auto-recovery ensures robustness in intermittent fault conditions |
Applications
| Automotive Engine Control Unit (ECU) | ADAS Camera Power Supply |
|---|---|
Use Scenario: Powers 3.3V microcontroller, CAN transceiver, and analog front-end in gasoline/diesel engine management systems exposed to cold-crank (5V min) and load-dump (42V) events. IC Role / Device Role / Timing Role: Primary 5V buck regulator providing stable, sequenced power with PGOOD signaling for MCU boot integrity. Use Value: 99% max duty cycle maintains regulation during 3.5V cold-crank; 30µA quiescent current prevents battery depletion during extended parking. |
Use Scenario: Supplies 1.8V/3A to image sensor and ISP in forward-facing camera module mounted behind windshield. IC Role / Device Role / Timing Role: Point-of-load converter delivering low-noise, tightly regulated voltage with fast transient response to handle burst pixel readout currents. Use Value: Skip-mode operation achieves >85% efficiency at 10mA load; 110ns min on-time sustains regulation at 1MHz fSW with small 2.2µH inductor. |
| Industrial IoT Gateway | Commercial Vehicle Telematics |
Use Scenario: Powers ARM Cortex-M7 SoC and LTE modem in DIN-rail-mounted gateway operating from 24V DC industrial bus. IC Role / Device Role / Timing Role: High-input-voltage buck converter with adjustable output (1.2V–3.3V) supporting multiple SoC core voltages. Use Value: 1V–10V output adjustability enables single design reuse across different processors; 42V transient rating eliminates need for external TVS. |
Use Scenario: Supplies 5V to GPS receiver, GNSS module, and cellular radio in heavy-duty truck telematics unit subject to vibration and wide ambient temperature swings. IC Role / Device Role / Timing Role: Automotive-qualified DC-DC with -40°C to +125°C operation and PGOOD for firmware watchdog coordination. Use Value: AEC-Q100 qualification ensures reliability in harsh commercial vehicle environments; exposed pad enhances thermal performance in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQR | 4.5V–36V input, 8A output, 50µA IQ, fixed 5V or adjustable; uses voltage-mode control, no BIAS LDO | Lacks integrated 5V BIAS rail and cold-crank optimized high-duty-cycle operation; better suited for higher-current non-automotive apps | Select if >3A output or lower cost per amp is critical; avoid if BIAS-powered peripherals or cold-crank support required |
| TPS62933RTER | 3V–36V input, 3A, 15µA IQ, 1.8V–5.5V output only, no PGOOD, no FSYNC, QFN-only | No power-good output or clock sync; limited output range excludes 8V/10V rails; lacks automotive temp grade (-40°C to +125°C) | Choose for ultra-low-IQ portable applications where PGOOD and extended voltage range are unnecessary |
Compared with LM61480RQR and TPS62933RTER, MAX16909RAUE+T uniquely combines automotive temperature grade, integrated BIAS LDO, cold-crank capability, and PGOOD in a TSSOP package-making it optimal for cost-sensitive, space-constrained automotive ECUs requiring robust sequencing and low standby drain.
Availability
MAX16909RAUE+T is available at Aetrix Electronics and suitable for automotive ECU power supplies, ADAS camera modules, and industrial IoT gateways requiring stable component supply with automotive-grade reliability and long lifecycle support.
Supply support for MAX16909RAUE+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.
The MAX16909RAUE+T belongs to Maxim's automotive power management portfolio, engineered specifically for harsh-environment DC-DC conversion in engine control, body electronics, and ADAS systems with emphasis on cold-crank resilience and ultra-low quiescent current.
FAQ
What is the maximum input voltage transient the MAX16909RAUE+T can withstand?
The MAX16909RAUE+T supports 42V input transients for durations less than 1 second, meeting ISO 7637-2 Pulse 5a (load dump) requirements. This rating applies to both SUP and SUPSW pins, allowing direct battery connection without external TVS diodes in many automotive designs. The device remains functional and protected during such events due to internal overvoltage clamping and thermal management.
Does the MAX16909RAUE+T require external components for basic operation?
Yes - the MAX16909RAUE+T requires an external inductor (e.g., 10µH), input/output capacitors (≥47µF/100µF), bootstrap capacitor (0.1µF), feedback resistors (for adjustable output), and optional RFOSC resistor (for frequency setting). The BIAS pin requires a 1µF ceramic bypass capacitor. No external MOSFET or driver is needed due to the integrated 3A high-side switch.
How does the MAX16909RAUE+T achieve low quiescent current in standby mode?
The MAX16909RAUE+T achieves 30µA standby current by entering skip mode at light loads (<300mA), disabling most internal circuitry and drawing bias power from VOUT (when 3V–5.5V) instead of SUP. In shutdown (EN = low), current drops further to 5µA typical by turning off the BIAS LDO and gate drivers - a key enabler for always-on automotive subsystems.
Can the MAX16909RAUE+T be synchronized to an external clock, and what are the requirements?
Yes - the MAX16909RAUE+T accepts an external clock on the FSYNC pin. For reliable synchronization, the external clock frequency must exceed the internal oscillator frequency by at least 10%, and the input thresholds are VFSYNC_HI = 1.4V (rising) and VFSYNC_LO = 0.4V (falling). The acquisition time is one clock cycle, enabling precise EMI control in multi-rail systems.
What thermal considerations apply to the MAX16909RAUE+T in TSSOP package?
The MAX16909RAUE+T in TSSOP has θJA = 38.3°C/W and θJC = 3°C/W. To maintain junction temperature ≤150°C at 3A load, the exposed pad (EP) must be soldered to a large contiguous GND copper area. At +70°C ambient, max continuous power dissipation is 2088.8mW; derating is 26.1mW/°C above +70°C. Thermal vias under EP are strongly recommended.
MAX16909RAUE+T 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+T FAQ
1.How can I place an order for MAX16909RAUE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16909RAUE+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 MAX16909RAUE+T reliable?
The price and inventory of MAX16909RAUE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16909RAUE+T is usually 5 days.
3.What payment methods are accepted for MAX16909RAUE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16909RAUE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16909RAUE+T?
MAX16909RAUE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16909RAUE+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 MAX16909RAUE+T?
For technical support, including MAX16909RAUE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16909RAUE+T requirements.
6.How does Aetrix verify that MAX16909RAUE+T is sourced from the original manufacturer or authorized distributors?
All MAX16909RAUE+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 MAX16909RAUE+T meets industry standards.
7.What is the process for return or replacement of MAX16909RAUE+T?
All MAX16909RAUE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16909RAUE+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 MAX16909RAUE+T part is unused and in its original packaging.
Return procedure for MAX16909RAUE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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