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Analog Devices Inc./Maxim Integrated MAX16909RAUE+
- Part No.:
- MAX16909RAUE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16909RAUE+.pdf
- Description:
- IC REG BUCK ADJ/1V 3A 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,059
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Product details
Overview
MAX16909RAUE+ 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 control units and ADAS power rails.
For engineers reviewing the MAX16909RAUE+ datasheet, MAX16909RAUE+ pinout, MAX16909RAUE+ application, or MAX16909RAUE+ equivalent, this page delivers verified electrical specs, thermal performance data, automotive transient tolerance (42V load dump), skip-mode behavior, and real-world compensation guidance - all confirmed against Maxim's official Rev 4 datasheet (19-5777).
Technical Context
The MAX16909RAUE+ 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 inputs (SUP and SUPSW) decouple bias regulation from switch drive, enabling stable operation down to 3.5V while tolerating 42V transients.
It integrates a 5V BIAS LDO (4.7–5.5V output, ±100mV line/load regulation), programmable soft-start (8.5ms), and open-drain PGOOD with 92.5–97% VFB trip thresholds. Synchronization via FSYNC accepts external clocks ≥10% above internal fSW, and skip mode reduces standby current to 30µA by powering internal circuitry from VOUT when VOUT = 3–5.5V.
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 load-dump immunity (42V transient) |
| Output Current | 3A continuous - sufficient for microcontroller cores, CAN transceivers, and sensor interfaces in ADAS modules |
| Quiescent Current | 30µA at no load - enables always-on systems (e.g., body control modules) without excessive battery drain |
| Switching Frequency | 220kHz to 1MHz - adjustable via FOSC resistor; higher frequencies reduce inductor size but increase switching losses |
| Output Voltage Options | 5V fixed (FB tied to BIAS) or 1V–10V adjustable (via external resistive divider) - supports diverse SoC I/O and core rail requirements |
| Thermal Protection | +175°C shutdown with 15°C hysteresis - ensures safe operation under sustained overload or poor PCB heatsinking |
| Package | 16-pin TSSOP with exposed pad - JEDEC-standard footprint; 38.3°C/W θJA enables 2.08W dissipation at TA = +70°C |
Pinout & Package
MAX16909RAUE+ is housed in a 16-pin TSSOP package (4.4mm × 5.0mm × 1.2mm) with exposed thermal pad (EP) requiring connection to a large-area ground plane. Pin 1 is FSYNC; pin 16 is I.C. (internally connected, must be grounded); EP is not a signal pin and must be soldered to GND for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FSYNC) | Synchronization input | Accepts external clock ≥10% above internal fSW; connect to GND for internal oscillator only |
| 2 (FOSC) | Frequency-setting input | Resistor-to-GND sets fSW (220kHz–1MHz); 66.5kΩ yields ~400kHz per datasheet Figure 2 |
| 3 (PGOOD) | Open-drain power-good monitor | Asserts low when VOUT drops below 92.5% of target; deasserts above 95% - enables safe power sequencing |
| 4 (OUT) | Switch regulator output | Delivers regulated voltage; powers internal circuitry in standby when VOUT = 3–5.5V |
| 5 (FB) | Feedback input | Tied to BIAS for 5V fixed output; connected to resistive divider for adjustable output (VFB = 1.0V ±1.5%) |
| 6 (COMP) | Error amplifier output | Connect RC network (e.g., 47kΩ + 2.7nF) to GND for loop stability with ceramic output capacitors |
| 7 (BIAS) | 5V linear regulator output | Powers internal logic; requires 1µF ceramic bypass to GND; ±100mV regulation over line/load/temperature |
| 8 (GND) | Analog/digital ground reference | Main return path; connect EP to same ground plane but avoid using EP as sole GND connection |
| 9 (BST) | Bootstrap supply for high-side driver | Requires 0.1µF capacitor between BST and LX; critical for proper high-side MOSFET gate drive |
| 10 (SUP) | Main supply input | Powers internal LDO; requires ≥4.7µF ceramic capacitor to GND; rated 3.5–36V |
| 11–12 (LX) | Switch node | Connects to inductor and Schottky freewheeling diode cathode; handles 4A RMS current |
| 13–14 (SUPSW) | High-side switch supply | Powers internal MOSFET driver; requires 0.1µF + 4.7µF decoupling to GND; rated 3.5–36V |
| 15 (EN) | Enable input | Logic-high (>2V) enables device; compatible with KL30/KL15 automotive rails; 5µA shutdown current |
| 16 (I.C.) | Internally connected | Must be connected to GND; not functional as signal or power pin |
| EP | Exposed thermal pad | Not electrically active; solder to solid copper ground plane for thermal conduction (θJC = 3°C/W) |
Key Features
| Feature | Design Value |
|---|---|
| 42V input transient tolerance | Withstands automotive load-dump events without latch-up or damage - eliminates need for external TVS clamping |
| 98% max duty cycle | Maintains regulation during cold-crank (e.g., 5V out at 6V input) - critical for engine start-stop systems |
| 30µA standby current | Enables >1-year battery life in always-on telematics modules powered from vehicle battery |
| Integrated 3A/70mΩ high-side switch | Reduces BOM count and layout area vs. discrete controller + MOSFET solutions; RDS(on) typ = 70mΩ @ 1A |
| Fast load-transient response | Recovers from 0.5A step load within 100µs (typ) - prevents brownout in noise-sensitive ADC or RF circuits |
| Power-good monitor with hysteresis | PGOOD asserts only after VOUT stabilizes within ±5% of target and remains valid for >10µs - prevents false system resets |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Power Rail |
|---|---|
|
Use Scenario: Powers 32-bit MCU, CAN FD transceiver, and analog front-end in under-hood ECU exposed to –40°C to +125°C ambient and 42V load-dump transients. IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying core logic and interface peripherals; provides PGOOD for MCU reset coordination. Use Value: 30µA quiescent current extends battery life during vehicle sleep mode; 98% duty cycle maintains 5V output during 6V cold-crank. |
Use Scenario: Generates isolated 3.3V rail for digital I/O modules in factory automation controllers operating from 24V DC bus. IC Role / Device Role / Timing Role: Adjustable-output step-down converter (set to 3.3V) with synchronization to system clock to minimize EMI in dense PCB layouts. Use Value: FSYNC input allows deterministic switching alignment with PLC master clock; 220kHz–1MHz range balances efficiency and filter size. |
| ADAS Camera Module Power Supply | Telematics Control Unit (TCU) Always-On Rail |
|
Use Scenario: Supplies 1.8V core voltage to image signal processor (ISP) and MIPI CSI-2 serializer in rear-view camera module. IC Role / Device Role / Timing Role: Secondary adjustable buck stage (1.8V @ 2A) following primary 5V rail; uses skip mode to minimize heat in sealed enclosure. Use Value: 110ns minimum on-time enables stable 1.8V output at 1MHz switching - reducing inductor size to fit compact camera housing. |
Use Scenario: Provides 5V always-on rail for GNSS receiver, cellular modem, and secure boot ROM in vehicle TCU with <100µA total system sleep current. IC Role / Device Role / Timing Role: Standby-optimized buck converter feeding low-dropout regulators; leverages VOUT-powered internal circuitry to achieve 30µA ISUP_STANDBY. Use Value: Eliminates need for external low-IQ LDO; integrated BIAS LDO simplifies power tree while meeting ISO 16750-2 quiescent current requirements. |
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, 50µA IQ, no integrated BIAS LDO, requires external bootstrap capacitor | Better suited for high-current infotainment SoCs; lacks dedicated BIAS rail for internal logic power | Select when >3A output or lower cost per amp is required; verify external LDO needed for bias supply |
| TPS650320RSLR | 2.7–5.5V input only, dual 3A/1.5A outputs, 25µA IQ, integrated PMIC sequencer, QFN-32 | Designed for low-voltage battery-powered systems (e.g., portable diagnostics), not 12V/24V automotive | Choose only for sub-6V input designs; incompatible with MAX16909RAUE+'s 3.5–36V range and load-dump robustness |
Compared with LM61480RQWR and TPS650320RSLR, the MAX16909RAUE+ uniquely combines 3.5–36V operation, 42V transient tolerance, integrated 5V BIAS LDO, and 30µA standby current - making it optimal for automotive ECU and ADAS subsystems where input ruggedness and ultra-low sleep current are mandatory.
Availability
MAX16909RAUE+ is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, and ADAS camera power supplies requiring stable component supply across extended temperature and high-reliability automotive qualification.
Supply support for MAX16909RAUE+ 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+ belongs to Maxim's automotive power management portfolio, engineered specifically for harsh-environment DC-DC conversion in engine compartments and ADAS domains - emphasizing input transient robustness, wide temperature operation, and ultra-low quiescent current.
FAQ
What is the maximum input voltage the MAX16909RAUE+ can withstand during load-dump events?
The MAX16909RAUE+ sustains 42V input transients for up to 1 second without damage or regulation loss, per Absolute Maximum Ratings table. This exceeds ISO 7637-2 Pulse 5a requirements and eliminates need for external TVS diodes in most automotive designs. The device continues normal operation after transient clearance, with no latch-up or reset required.
How does the MAX16909RAUE+ achieve 30µA quiescent current in standby mode?
The MAX16909RAUE+ achieves 30µA ISUP_STANDBY by powering internal circuitry (excluding gate drivers) from VOUT when VOUT is between 3V and 5.5V - bypassing the main SUP supply. This occurs automatically in skip mode during light loads. The BIAS LDO is disabled, and only essential monitoring blocks remain active, minimizing battery drain in always-on vehicle systems.
Can the MAX16909RAUE+ operate with a 1MHz switching frequency and maintain stability?
Yes, the MAX16909RAUE+ supports 1MHz operation with proper compensation: use RFOSC = 15.4kΩ (per Figure 2), select an inductor with ≤1.5µH value and ≥4A saturation current, and apply a 47kΩ + 2.7nF RC network from COMP to GND. Stability is confirmed in datasheet Figure toc05 and typical application notes for 1MHz at 14V input/5V output.
What is the function of the I.C. pin (pin 16) on the MAX16909RAUE+?
The I.C. pin on the MAX16909RAUE+ is internally connected and has no external functionality. Per Pin Descriptions section, it must be connected to GND on the PCB to ensure proper device operation and thermal performance. Leaving it floating may cause undefined behavior or reduced reliability.
Does the MAX16909RAUE+ require an external Schottky diode, and what are its key selection criteria?
Yes, the MAX16909RAUE+ requires an external Schottky diode connected between LX and GND. Select a diode with reverse voltage rating >42V (e.g., B360B-13-F), forward voltage <0.45V at 3A, and low junction capacitance. Mount it close to the IC with short traces to minimize ringing and EMI - critical for passing CISPR-25 Class 5 emissions testing.
MAX16909RAUE+ 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+ FAQ
1.How can I place an order for MAX16909RAUE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16909RAUE+ 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+ reliable?
The price and inventory of MAX16909RAUE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16909RAUE+ is usually 5 days.
3.What payment methods are accepted for MAX16909RAUE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16909RAUE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16909RAUE+?
MAX16909RAUE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16909RAUE+ 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+?
For technical support, including MAX16909RAUE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16909RAUE+ requirements.
6.How does Aetrix verify that MAX16909RAUE+ is sourced from the original manufacturer or authorized distributors?
All MAX16909RAUE+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX16909RAUE+?
All MAX16909RAUE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16909RAUE+, 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+ part is unused and in its original packaging.
Return procedure for MAX16909RAUE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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