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Analog Devices Inc./Maxim Integrated MAX16909RATE+T
- Part No.:
- MAX16909RATE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
MAX16909RATE+T.pdf
- Description:
- IC REG BUCK ADJ/1V 3A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,999
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Product details
Overview
MAX16909RATE+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 rails.
For engineers reviewing the MAX16909RATE+T datasheet, MAX16909RATE+T pinout, MAX16909RATE+T application, or MAX16909RATE+T equivalent, this page delivers verified electrical parameters, thermal behavior under load-dump transients, skip-mode efficiency trade-offs, and precise pin-function mapping for TQFN-16 (5mm × 5mm) layout integration.
Technical Context
The MAX16909RATE+T implements constant-frequency current-mode control with internal slope compensation, enabling stable operation up to 99% duty cycle during cold-crank undervoltage events (down to 3.5V). Its transconductance error amplifier (gm = 900µS) interfaces directly with external RC compensation on COMP pin for ceramic-output-capacitor stability.
It integrates dual supply inputs-SUP (3.5V–36V for bias LDO) and SUPSW (3.5V–36V for high-side switch)-enabling independent voltage handling during transients. The FSYNC input accepts external clocks ≥10% above internal fSW, while BIAS provides regulated 5V ±0.3V at up to 50mA for auxiliary circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V - supports automotive battery rail including cold-crank (3.5V) and load-dump (42V transient) |
| Output Current | 3A continuous - enables single-chip 5V/3A supply for ECUs, camera modules, and radar sensors |
| Quiescent Current | 30µA at no load - extends battery life in always-on vehicle systems (e.g., telematics, alarm) |
| Switching Frequency | 220kHz to 1MHz - adjustable via FOSC resistor; higher frequencies reduce inductor size (e.g., 10µH @ 400kHz → 4.7µH @ 800kHz) |
| Output Voltage Options | 5V fixed (FB tied to BIAS) or 1V–10V adjustable - eliminates external divider for 5V rails; supports multi-rail SoC core/I/O supplies |
| Thermal Shutdown | +175°C with 15°C hysteresis - protects against sustained overload in sealed enclosures without airflow |
| Power-Good Accuracy | ±2.5% window (92.5%–95% VFB) - ensures reliable sequencing with downstream processors and FPGAs |
Pinout & Package
MAX16909RATE+T is packaged in a thermally enhanced 16-pin TQFN (5mm × 5mm) with exposed pad (EP), optimized for automotive PCBs requiring low thermal resistance (θJA = 35°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FSYNC) | External clock synchronization input | Accepts TTL/CMOS clock ≥10% above internal fSW; enables EMI reduction via spread-spectrum master clock alignment |
| 2 (FOSC) | Frequency-setting resistor input | Connects to GND via RFOSC (e.g., 65kΩ → 400kHz); sets switching frequency without trimming or calibration |
| 3 (PGOOD) | Open-drain power-good monitor | Asserts low when VOUT drops below 92.5% of regulation; used for processor reset assertion and supply sequencing |
| 4 (OUT) | Switch-regulator output node | Delivers regulated DC output; powers internal circuitry when VOUT = 3V–5.5V in standby mode |
| 5 (FB) | Feedback voltage input | Connects to resistive divider for adjustable output; shorted to BIAS for 5V fixed mode - eliminates external components |
| 6 (COMP) | Error amplifier output | Interface for external RC compensation network; stabilizes loop with ceramic output capacitors (no CF required) |
| 7 (BIAS) | Integrated 5V LDO output | Supplies internal logic and gate drivers; bypassed with 1µF ceramic capacitor - reduces need for external bias supply |
| 8 (GND) | Analog/digital ground reference | Primary return path; must be connected to EP and system ground plane for thermal and noise performance |
| 9 (BST) | Bootstrap capacitor connection | Requires 0.1µF capacitor between BST and LX to drive high-side MOSFET gate above input rail |
| 10 (SUP) | Main supply input for bias LDO | Accepts 3.5V–36V; powers internal regulator - decoupled with ≥4.7µF ceramic capacitor |
| 11–12 (LX) | Switching node (dual-pin for current sharing) | Connects to inductor and Schottky diode cathode; dual pins reduce trace inductance and improve EMI |
| 13–14 (SUPSW) | High-side switch supply input | Separate 3.5V–36V input for MOSFET driver; decoupled with 0.1µF + 4.7µF ceramics to suppress switching noise |
| 15 (EN) | Enable input with automotive voltage tolerance | Active-high; compatible with KL30 (battery) or CAN transceiver INH - no level-shifter needed |
| 16 (I.C.) | Internally connected terminal | Must be tied to GND; not functional - serves internal test structure and die attachment |
| EP | Exposed thermal pad | Connected to large copper ground plane; accounts for >70% of heat dissipation - mandatory for 3A operation |
Key Features
| Feature | Design Value |
|---|---|
| 42V input transient tolerance | Withstands ISO 7637-2 Pulse 5a load-dump events without derating or external clamping |
| 98% max duty cycle at 1MHz | Maintains regulation during cold-crank (5V input) with minimal output droop - critical for infotainment boot |
| 110ns minimum on-time | Enables high VIN/VOUT ratios (e.g., 24V→3.3V) at 1MHz without pulse-skipping instability |
| 5µA shutdown current | Reduces parasitic drain in parked-vehicle scenarios - meets OEM <100µA total-system leakage targets |
| Integrated overvoltage/overcurrent/thermal protection | Auto-recovery after fault clearance - eliminates need for external supervisor IC in cost-sensitive modules |
Applications
| Automotive Camera Module Power | ADAS Radar Sensor Supply |
|---|---|
|
Use Scenario: Powers 5V image sensor, ISP, and interface logic in rear-view or surround-view cameras exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 5V/2.5A with fast load-transient response to handle burst-mode imaging. Use Value: 30µA quiescent current prevents battery drain during vehicle sleep; 42V transient tolerance avoids field failures during jump-starts. |
Use Scenario: Supplies 3.3V/2A to millimeter-wave radar transceivers requiring tight ripple (<20mVpp) and thermal robustness. IC Role / Device Role / Timing Role: Adjustable-output buck converter with 1V–10V range, configured for 3.3V using external resistor divider. Use Value: 220kHz–1MHz programmability allows EMI tuning to avoid radar band interference; 98% duty cycle sustains output during cold-crank. |
| Infotainment Head Unit Core Rail | Telematics Control Unit (TCU) Power |
|
Use Scenario: Generates 1.1V/3A for application processor cores in head units operating across –40°C to +105°C ambient. IC Role / Device Role / Timing Role: High-efficiency step-down converter with skip mode for dynamic CPU load profiles (idle vs. navigation rendering). Use Value: Fast load-transient response (<100µs recovery) prevents brownouts during sudden GPU activity; thermal shutdown prevents silicon damage in sealed dashboards. |
Use Scenario: Provides always-on 5V/1A supply for LTE modem, GNSS receiver, and CAN controller in cellular-connected TCUs. IC Role / Device Role / Timing Role: Fixed 5V output with PGOOD sequencing signal to coordinate modem wake-up and GPS acquisition timing. Use Value: 5µA shutdown current meets UNECE R100 leakage requirements; EN pin compatibility with CAN transceiver INH simplifies wake-up architecture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480-Q1 | 4.5V–36V input, 8A output, 2.1MHz max fSW, 15µA IQ; requires external compensation | Better suited for higher-current (>4A) or higher-frequency (>1MHz) designs; lacks integrated BIAS LDO | Select when scaling power delivery beyond 3A or needing faster transient response via higher fSW |
| TPS650361-Q1 | 3.5V–36V input, dual 3A/2A outputs, integrated LDOs, I2C interface; 40µA IQ | Multi-rail PMIC for SoC power domains; adds complexity for single-rail use cases | Choose when powering multiple voltage domains (e.g., core + I/O + memory) from one IC |
Compared with LM61480-Q1 and TPS650361-Q1, the MAX16909RATE+T offers lower quiescent current (30µA vs. 40µA/15µA), integrated BIAS LDO eliminating external bias supply, and simpler compensation - making it optimal for cost- and space-constrained single-rail automotive modules.
Availability
MAX16909RATE+T is available at Aetrix Electronics and suitable for automotive camera modules, ADAS radar sensors, infotainment head units, and telematics control units requiring stable component supply across extended temperature and transient-voltage conditions.
Supply support for MAX16909RATE+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 MAX16909RATE+T belongs to Maxim's automotive power-management portfolio, engineered specifically for harsh-environment DC-DC conversion in engine compartments, ADAS, and infotainment systems where wide VIN, low IQ, and transient robustness are mandatory.
FAQ
What is the maximum input voltage transient the MAX16909RATE+T can withstand?
The MAX16909RATE+T tolerates 42V input transients for durations under 1 second, complying with ISO 7637-2 Pulse 5a load-dump requirements. This rating is validated across the full –40°C to +125°C junction temperature range and does not require external TVS diodes for standard automotive deployment.
Does the MAX16909RATE+T support fixed 5V output without external resistors?
Yes. The MAX16909RATE+T supports fixed 5V output by connecting the FB pin directly to the BIAS pin - eliminating the need for an external feedback resistor divider. This configuration maintains ±1.5% output accuracy over line, load, and temperature, and reduces bill-of-materials count in cost-sensitive designs.
How does the MAX16909RATE+T achieve 30µA quiescent current in standby mode?
The MAX16909RATE+T achieves 30µA standby current by dynamically powering internal circuitry from VOUT (when 3V–5.5V) instead of SUP/SUPSW during light loads, and by disabling non-essential blocks in skip mode. This behavior is confirmed in the Electrical Characteristics table under ISUP_STANDBY (30µA typ at VOUT = 5V, TA = +25°C).
What package type and thermal characteristics apply to the MAX16909RATE+T?
The MAX16909RATE+T uses a 16-pin TQFN package (5mm × 5mm) with exposed pad. Its thermal resistance is θJA = 35°C/W and θJC = 2.7°C/W on a 4-layer JEDEC-standard board. These values are measured per JESD51-7 and enable 3A continuous operation at +105°C ambient with proper PCB copper area.
Can the MAX16909RATE+T synchronize to an external clock, and what are the constraints?
Yes. The MAX16909RATE+T synchronizes to an external clock applied to the FSYNC pin. The external clock frequency must exceed the internal oscillator frequency by at least 10% for reliable lock-in, and the input thresholds are VFSYNC_HI = 1.4V (min) and VFSYNC_LO = 0.4V (max), supporting standard CMOS/TTL logic levels.
MAX16909RATE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WQFN 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-TQFN (5x5)
MAX16909RATE+T FAQ
1.How can I place an order for MAX16909RATE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16909RATE+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 MAX16909RATE+T reliable?
The price and inventory of MAX16909RATE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16909RATE+T is usually 5 days.
3.What payment methods are accepted for MAX16909RATE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16909RATE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16909RATE+T?
MAX16909RATE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16909RATE+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 MAX16909RATE+T?
For technical support, including MAX16909RATE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16909RATE+T requirements.
6.How does Aetrix verify that MAX16909RATE+T is sourced from the original manufacturer or authorized distributors?
All MAX16909RATE+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 MAX16909RATE+T meets industry standards.
7.What is the process for return or replacement of MAX16909RATE+T?
All MAX16909RATE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16909RATE+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 MAX16909RATE+T part is unused and in its original packaging.
Return procedure for MAX16909RATE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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