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Analog Devices Inc./Maxim Integrated MAX16909RAUE+CFZ
- Part No.:
- MAX16909RAUE+CFZ
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16909RAUE+CFZ.pdf
- Description:
- IC REG BUCK ADJ/1V 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:122
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Product details
Overview
MAX16909RAUE+CFZ from Maxim Integrated is a 3A, current-mode synchronous step-down DC-DC converter with integrated high-side MOSFET (70 mΩ typ), designed for automotive and industrial power supplies. It operates from 3.5V to 36V input, delivers 5V fixed or 1V–10V adjustable output, supports 220kHz–1MHz resistor-programmable switching frequency, and draws only 30 µA quiescent current in standby mode - enabling reliable operation during cold-crank undervoltage transients.
For engineers reviewing the MAX16909RAUE+CFZ datasheet, MAX16909RAUE+CFZ pinout, MAX16909RAUE+CFZ application, or MAX16909RAUE+CFZ equivalent, key selection criteria include its 42V transient tolerance, 98% max duty cycle at 1MHz, integrated BIAS LDO (5V/100mA), PGOOD monitoring, and thermal/overvoltage/overcurrent protection - all validated across –40°C to +125°C.
Technical Context
The MAX16909RAUE+CFZ implements constant-frequency current-mode control with internal slope compensation, enabling stable regulation under wide VIN/VOUT differentials and fast load-transient response. Its dual supply inputs (SUP and SUPSW) decouple bias and switch-driver power paths, supporting high-duty-cycle operation during undervoltage events like automotive cold-crank.
It features an internal 5V BIAS LDO powering control circuitry, a dedicated FSYNC input for external clock synchronization (±10% frequency margin), and skip-mode operation below ~300 mA load to maintain >85% efficiency at light loads - all while delivering regulated output down to 1V with ±1% FB reference accuracy (0.99–1.01 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports full automotive battery range including cold-crank (≥9V) and load-dump (≤42V transient) |
| Output Current | 3A continuous - sufficient for microcontroller core rails, ADAS sensors, and infotainment subsystems |
| Switching Frequency | 220kHz to 1MHz - adjustable via FOSC resistor; enables trade-off between EMI, inductor size, and efficiency |
| Quiescent Current | 30 µA at no load - extends battery life in always-on vehicle modules (e.g., telematics, CAN gateways) |
| FB Reference Voltage | 1.00 V ±1% - enables precise output regulation from 1V to 10V using external resistor divider |
| Thermal Shutdown | +175°C with 15°C hysteresis - ensures safe recovery after overtemperature fault without manual reset |
| Power-Good Accuracy | 95% VFB rising / 92.5% VFB falling - provides robust sequencing margin for downstream logic and memory |
Pinout & Package
MAX16909RAUE+CFZ is packaged in a 16-pin TSSOP (4.4mm × 5mm) with exposed pad, optimized for thermal dissipation in space-constrained automotive PCBs. Pin mapping is identical to the MAX16909 family's TSSOP variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FSYNC) | External clock sync input | Accepts TTL/CMOS clock ≥10% above internal fSW; enables EMI reduction via spread-spectrum alignment |
| 2 (FOSC) | Frequency-setting resistor node | Connects to GND via RFOSC (e.g., 65 kΩ → 400 kHz); sets oscillator timing without trimming |
| 3 (PGOOD) | Open-drain power-good monitor | Asserts low when VOUT drops ≤92.5% of target; debounced 10–60 µs for noise immunity |
| 4 (OUT) | Switch-node output | Delivers regulated DC output; powers internal circuitry when VOUT = 3–5V in standby mode |
| 5 (FB) | Feedback voltage sense | Direct connection to BIAS yields 5V fixed output; external divider enables 1–10V adjustment |
| 6 (COMP) | Error amplifier output | Interface for RC compensation network; stabilizes loop with ceramic or polymer output caps |
| 7 (BIAS) | Integrated 5V LDO output | Supplies internal logic; requires 1 µF ceramic bypass to GND; regulates down to 2.9V UVLO |
| 8 (GND) | Analog/digital ground reference | Primary return path; must be connected to EP (exposed pad) and system ground plane |
| 9 (BST) | Bootstrap capacitor node | Requires 0.1 µF capacitor to LX; enables high-side gate drive above input rail |
| 10 (SUP) | Main supply input | Powers internal LDO and logic; requires ≥4.7 µF ceramic decoupling to GND |
| 11–12 (LX) | Switching node | Connects to inductor and Schottky freewheel diode cathode; handles 4A RMS current |
| 13–14 (SUPSW) | High-side switch supply | Powers gate driver; requires 4.7 µF + 0.1 µF local decoupling; tolerant to 42V transients |
| 15 (EN) | Enable input | Logic-compatible (VEN_HI = 2V min); connects directly to KL30 or CAN transceiver INH pin |
| 16 (I.C.) | Internally connected | Must be tied to GND; not functional as signal or power terminal |
| EP | Exposed thermal pad | Electrically GND; requires solid copper pour for thermal conduction (θJA = 38.3°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| 42V Input Transient Tolerance | Withstands automotive load-dump events without latch-up or parameter shift - eliminates need for external TVS |
| 98% Max Duty Cycle at 1MHz | Maintains regulation during cold-crank (VIN ↓ to 3.5V) without dropout - critical for engine-control modules |
| 30 µA Standby Current | Enables >1-year battery hold-up in parked-vehicle applications (e.g., remote keyless entry, alarm systems) |
| Integrated 3A High-Side Switch | 70 mΩ RDS(on) reduces conduction loss vs. discrete solutions; eliminates external MOSFET layout complexity |
| Fast Load-Transient Response | Recovers from 0→3A step in <100 µs with <50 mV overshoot - protects sensitive ADCs and RF front-ends |
| Power-Good Monitor with Debounce | 10–60 µs programmable debounce prevents false resets during line transients - simplifies power sequencing |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC I/O Power Rail |
|---|---|
Use Scenario: Supplies 5V/3A to microcontroller, CAN transceiver, and sensor interface in door module or lighting controller. IC Role / Device Role / Timing Role: Primary buck regulator converting 12V battery to clean 5V logic rail with PGOOD sequencing for MCU boot. Use Value: 42V transient tolerance eliminates external surge protection; 30 µA standby current meets ISO 16750-2 parking mode requirements. | Use Scenario: Powers isolated analog input channels and digital I/O in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Point-of-load DC-DC converter accepting wide-range 24V industrial supply (18–32V) and delivering stable 3.3V/2A. Use Value: Adjustable output (1–10V) supports multiple rail configurations; -40°C to +125°C rating ensures reliability in uncooled enclosures. |
| ADAS Camera Power Supply | Telematics Control Unit (TCU) Core Rail |
Use Scenario: Generates 1.8V/3A for image sensor and ISP in rear-view or surround-view camera module. IC Role / Device Role / Timing Role: High-efficiency buck converter operating at 800kHz to minimize EMI near RF-sensitive imaging circuits. Use Value: Skip-mode operation maintains >90% efficiency at 100 mA idle current; fast transient response prevents image corruption during motion blur. | Use Scenario: Provides 1.1V/3A core voltage to LTE modem and application processor in vehicle connectivity unit. IC Role / Device Role / Timing Role: Synchronous buck regulator with external clock sync (FSYNC) aligned to baseband SoC clock domain. Use Value: FSYNC input enables deterministic EMI placement; 110 ns minimum on-time supports 1.1V/12V conversion ratio at 1MHz. |
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 | 4.5–36V input, 8A output, 2.1MHz max fSW, 15 µA IQ - higher current, lower IQ, but no BIAS LDO or FSYNC | Lacks integrated 5V BIAS rail and clock sync; requires external bias supply and offers no EMI synchronization | Prefer when higher output current and ultra-low IQ are critical, and external bias generation is acceptable |
| TPS543B20RHLT | 4–18V input, 3A output, 500kHz–2MHz fSW, 12 µA IQ - supports PMBus, no 42V transient rating | No automotive-grade transient tolerance; requires digital interface for configuration; limited VIN range excludes 24V industrial use | Select for digitally controlled systems needing telemetry, but avoid where 42V load-dump immunity is mandatory |
Compared with LM61480RQWR and TPS543B20RHLT, the MAX16909RAUE+CFZ uniquely integrates a 5V BIAS LDO, FSYNC synchronization, and 42V transient capability - making it the only choice for cost-sensitive, analog-controlled automotive modules requiring single-chip simplicity and robustness.
Availability
MAX16909RAUE+CFZ is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power rails, ADAS camera modules, and telematics control units requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX16909RAUE+CFZ 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 delivers high-reliability, wide-input DC-DC converters optimized for automotive power systems - specifically addressing cold-crank resilience, load-dump survival, and low-quiescent-current operation in always-on modules.
FAQ
What is the maximum input voltage transient the MAX16909RAUE+CFZ can withstand?
The MAX16909RAUE+CFZ is rated for 42V input transients lasting less than 1 second, per its Absolute Maximum Ratings. This allows direct connection to automotive battery rails without external TVS diodes during load-dump events. The device remains fully functional and does not latch up or degrade performance when exposed to this stress level, as verified in the Electrical Characteristics table under "Load-Dump Event Supply Voltage".
Does the MAX16909RAUE+CFZ support both fixed and adjustable output voltages?
Yes, the MAX16909RAUE+CFZ supports two output configurations: connecting FB directly to BIAS yields a precise 5V fixed output, while connecting FB to a resistive divider between OUT and GND enables adjustable output from 1V to 10V. The FB reference voltage is tightly specified at 1.00 V ±1%, ensuring accurate regulation across temperature and load - confirmed in the Electrical Characteristics table under "FB Regulation Voltage".
How does the MAX16909RAUE+CFZ achieve low quiescent current in standby mode?
The MAX16909RAUE+CFZ achieves 30 µA typical standby current by entering skip mode at light loads (<300 mA), where most internal circuitry (including the BIAS LDO) is powered from VOUT instead of SUP/SUPSW. This architecture reduces battery drain significantly - especially critical for always-on automotive modules. The datasheet confirms this value under "Standby mode, no load, VOUT = 5V" in the Electrical Characteristics table.
Can the MAX16909RAUE+CFZ be synchronized to an external clock, and what are the requirements?
Yes, the MAX16909RAUE+CFZ accepts external synchronization via the FSYNC pin. The external clock frequency must exceed the internal oscillator frequency by at least 10% for reliable locking, with acquisition completed within one cycle. Input thresholds are VFSYNC_HI = 1.4 V (rising) and VFSYNC_LO = 0.4 V (falling), compatible with standard CMOS logic levels - details are specified in the "EXTERNAL CLOCK INPUT (FSYNC)" section of the Electrical Characteristics table.
What package type and thermal characteristics does the MAX16909RAUE+CFZ use?
The MAX16909RAUE+CFZ uses a 16-pin TSSOP package with exposed pad (EP), measuring 4.4mm × 5mm. Its thermal resistance is θJA = 38.3°C/W (JEDEC 4-layer board), and θJC = 3°C/W. The EP must be soldered to a large contiguous copper ground plane for effective heat dissipation - as stated in the "PACKAGE THERMAL CHARACTERISTICS" section and Pin Descriptions.
MAX16909RAUE+CFZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- 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+CFZ FAQ
1.How can I place an order for MAX16909RAUE+CFZ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16909RAUE+CFZ 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+CFZ reliable?
The price and inventory of MAX16909RAUE+CFZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16909RAUE+CFZ is usually 5 days.
3.What payment methods are accepted for MAX16909RAUE+CFZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16909RAUE+CFZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16909RAUE+CFZ?
MAX16909RAUE+CFZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16909RAUE+CFZ 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+CFZ?
For technical support, including MAX16909RAUE+CFZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16909RAUE+CFZ requirements.
6.How does Aetrix verify that MAX16909RAUE+CFZ is sourced from the original manufacturer or authorized distributors?
All MAX16909RAUE+CFZ 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+CFZ meets industry standards.
7.What is the process for return or replacement of MAX16909RAUE+CFZ?
All MAX16909RAUE+CFZ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16909RAUE+CFZ, 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+CFZ part is unused and in its original packaging.
Return procedure for MAX16909RAUE+CFZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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