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Analog Devices Inc. LT8609AIMSE16#TRPBF
- Part No.:
- LT8609AIMSE16#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609AIMSE16#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,422
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Product details
Overview
LT8609AIMSE16#TRPBF from Analog Devices is a 42V, 3A synchronous step-down regulator with 2.5µA quiescent current in Burst Mode, peak current mode control, internal compensation, and fixed 5V output. It operates from 3.0V to 42V input, delivers up to 3A continuous current, and supports synchronization or spread-spectrum modulation for low EMI-ideal for automotive infotainment power rails.
For engineers reviewing the LT8609AIMSE16#TRPBF datasheet, LT8609AIMSE16#TRPBF pinout, LT8609AIMSE16#TRPBF application, or LT8609AIMSE16#TRPBF equivalent, key selection criteria include its 5V fixed output, 16-lead MSOP package with exposed thermal pad, ±7.5% power-good accuracy, 2.5µA no-load IQ, and AEC-Q100 qualification for automotive use.
Technical Context
The LT8609AIMSE16#TRPBF implements peak current mode control with internal 0.782V reference and fixed 5V regulation via internal resistor divider (8.95MΩ), eliminating external feedback components. Its oscillator frequency is set by RT pin resistance and ranges from 200kHz to 2.2MHz; with RT = 18.2kΩ, it operates at 2.00MHz typical.
Burst Mode operation enables ultralow quiescent current (2.5µA regulating 12VIN to 5VOUT) while maintaining <10mVP-P output ripple. The SYNC pin supports external clock synchronization or spread-spectrum modulation; the EN/UV pin provides accurate 1.05V rising threshold with 50mV hysteresis for VIN UVLO programming or shutdown control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports wide automotive battery transients and industrial 24V/36V systems without pre-regulation. |
| Output Voltage | Fixed 5.00V ±2% - internally trimmed; eliminates external feedback resistors and improves stability over temperature. |
| Max Continuous Output Current | 3A - sufficient for powering microcontrollers, CAN transceivers, and sensor clusters in automotive ECUs. |
| Quiescent Current (Burst Mode) | 2.5µA at 12VIN/5VOUT - enables always-on functionality in vehicle body electronics with minimal battery drain. |
| Switching Frequency | 2.00MHz typical (RT = 18.2kΩ) - allows use of compact 2.2µH inductors and reduces solution footprint. |
| Power-Good Accuracy | ±7.5% on VOUT - ensures reliable system reset sequencing when 5V rail reaches valid operating range. |
| Minimum On-Time | 45ns - supports high step-down ratios (e.g., 42V→5V at 2MHz) without pulse-skipping instability. |
| AEC-Q100 Grade | Grade I (–40°C to +125°C) - qualified for under-hood and cabin automotive applications per stress test requirements. |
Pinout & Package
LT8609AIMSE16#TRPBF uses a 16-lead plastic MSOP package with exposed thermal pad (Pin 17 = GND), θJA = 40°C/W, θJC(PAD) = 10°C/W. The exposed pad must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap Supply | Drives high-side NMOS gate above VIN; requires 0.1µF ceramic capacitor to SW for proper top-switch turn-on. |
| SW | Switch Node | Connects to inductor and BST capacitor; high dv/dt node requiring minimized PCB trace area to reduce EMI. |
| INTVCC | Internal 3.5V Regulator Bypass | Must be decoupled with ≥1µF low-ESR ceramic capacitor to GND; powers internal logic and drivers. |
| RT | Frequency Set Resistor | Resistor to GND sets switching frequency (200kHz–2.2MHz); 18.2kΩ yields 2.00MHz typical. |
| SYNC | External Clock Input | Accepts 0V (Burst Mode), floating (pulse-skipping), or 3.2V–5.0V (spread-spectrum) for EMI reduction. |
| EN/UV | Enable / Input UVLO | 1.05V rising threshold with 50mV hysteresis; enables programmable VIN undervoltage lockout or shutdown. |
| VIN | Main Input Supply | Supplies internal circuitry and high-side switch; requires local 1µF+ ceramic bypass capacitor. |
| PG | Power-Good Flag | Open-drain output asserts high when VOUT is within ±7.5% of 5V and no fault exists; pulls low during startup/fault. |
| TR/SS | Soft-Start / Tracking | Capacitor-programmed voltage ramp controls 5V output slew rate; internal 2µA current source enables simple soft-start. |
| FB | Feedback Input | Not connected in LT8609A-5 variant; internal divider routes regulation to VOUT pin instead. |
| VOUT | Fixed 5V Output | Regulated 5.00V output node; connects to internal 8.95MΩ feedback divider; used for PG monitoring and load connection. |
| GND | Ground / Thermal Pad | Exposed pad (Pin 17) is GND and must be soldered to PCB plane for thermal dissipation and noise immunity. |
| NC | No Connect | Pins 2, 4, 12, 14 are no-connect; must remain unconnected per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow Quiescent Current | 2.5µA IQ in Burst Mode enables >1-year battery life in always-on automotive modules. |
| Fixed 5V Output with Internal Divider | Eliminates external FB resistors, reducing BOM count and improving long-term output voltage drift performance. |
| Spread-Spectrum Modulation | Reduces peak EMI by ±10% frequency dithering when SYNC is biased at 3.2V–5.0V, easing CISPR-25 compliance. |
| Fast Minimum On-Time (45ns) | Enables high-frequency operation (2MHz) even at high input-to-output voltage ratios, minimizing inductor size. |
| AEC-Q100 Qualified | Validated for automotive use across –40°C to +125°C junction temperature, including HTOL, TC, and ESD testing. |
| Integrated Soft-Start and Tracking | TR/SS pin supports controlled 5V ramp-up and seamless power-rail sequencing with other regulators in multi-rail systems. |
Applications
| Automotive Infotainment Power | Body Control Module (BCM) Core Rail |
|---|---|
Use Scenario: Powers DSPs, display controllers, and audio codecs in head units with strict EMI limits and cold-cranking tolerance. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering stable core power with spread-spectrum EMI suppression. Use Value: 2.5µA quiescent current prevents parasitic battery drain during vehicle sleep; 42V max input withstands load-dump transients. | Use Scenario: Supplies 5V to microcontrollers, LIN transceivers, and LED drivers in door modules and lighting nodes. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter enabling low-power wake-up modes and fast start-up. Use Value: ±7.5% PG accuracy ensures deterministic MCU reset timing; AEC-Q100 qualification guarantees reliability in harsh environments. |
| Industrial Sensor Hub | Telematics Control Unit (TCU) |
Use Scenario: Provides regulated 5V to multiple analog sensors, ADCs, and wireless SoCs in distributed IIoT edge nodes. IC Role / Device Role / Timing Role: Compact, high-input-voltage buck regulator supporting wide-range 12–36V industrial supplies. Use Value: 2MHz operation allows tiny 2.2µH inductors; internal compensation simplifies design validation and reduces layout iterations. | Use Scenario: Generates 5V for cellular modems, GNSS receivers, and secure boot processors in fleet management systems. IC Role / Device Role / Timing Role: Automotive-grade power supply with robust fault reporting via PG pin for ASIL-B functional safety support. Use Value: TR/SS-controlled soft-start prevents inrush current during ignition-on; EN/UV pin enables controlled power sequencing with main system controller. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609AEMSE#TRPBF | Same 5V fixed output, but in 10-lead MSOP package (smaller footprint, higher θJA = 40°C/W). | Limited thermal margin at full 3A load in high ambient; less suitable for sealed enclosures or under-hood placement. | Select when board space is constrained and thermal environment is ≤85°C ambient with adequate airflow. |
| LT8609AIMSE16#TRPBF-5 | Identical part number variant; same electrical specs, package, and qualification-no functional difference. | No application difference; identical use cases and mounting requirements. | Use interchangeably; suffix variation reflects tape-and-reel packaging only, not functional distinction. |
Compared with LT8609AEMSE#TRPBF, the LT8609AIMSE16#TRPBF offers superior thermal performance (θJC = 10°C/W vs. not specified for 10-lead) and larger copper area for heat spreading, making it preferred for sustained 3A loads in automotive cabins. The LT8609AIMSE16#TRPBF-5 is functionally identical and fully substitutable.
Availability
LT8609AIMSE16#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, body control modules, and telematics control units requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LT8609AIMSE16#TRPBF 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT8609/LT8609A/LT8609B product line delivers ultralow-IQ synchronous buck regulators optimized for automotive and industrial applications demanding high efficiency at light loads, wide input voltage range, and robust EMI performance.
FAQ
What is the output voltage accuracy of the LT8609AIMSE16#TRPBF?
The LT8609AIMSE16#TRPBF provides a fixed 5.00V output with initial accuracy of ±2% over temperature and line/load conditions. Its internal 8.95MΩ feedback divider ensures tight regulation without external resistor drift, and output voltage remains within ±0.375V (±7.5%) during power-good assertion for reliable system sequencing.
Does the LT8609AIMSE16#TRPBF require external feedback resistors?
No, the LT8609AIMSE16#TRPBF does not require external feedback resistors. As a fixed 5V variant of the LT8609A family, it integrates an internal 8.95MΩ resistor divider that directly regulates the VOUT pin to 5.00V, simplifying design, reducing component count, and improving long-term stability versus external resistor networks.
How does the SYNC pin function on the LT8609AIMSE16#TRPBF?
The SYNC pin on the LT8609AIMSE16#TRPBF supports three modes: tied low for Burst Mode (ultralow IQ), floating for pulse-skipping, or biased at 3.2V–5.0V for spread-spectrum modulation. Unlike the LT8609B, the LT8609AIMSE16#TRPBF retains full SYNC functionality, enabling EMI reduction without sacrificing light-load efficiency.
What thermal considerations apply to the LT8609AIMSE16#TRPBF's 16-lead MSOP package?
The LT8609AIMSE16#TRPBF uses a 16-lead MSOP with exposed thermal pad (Pin 17 = GND), achieving θJC = 10°C/W and θJA = 40°C/W. To maintain safe junction temperature at 3A, the exposed pad must be fully soldered to a minimum 100mm² internal or external copper plane with ≥4 thermal vias to inner ground layers.
Is the LT8609AIMSE16#TRPBF qualified for automotive applications?
Yes, the LT8609AIMSE16#TRPBF is AEC-Q100 qualified for Grade I (–40°C to +125°C) operation and manufactured under automotive quality controls. It meets stress test requirements for temperature cycling, high-temperature operating life, and ESD, making it suitable for front-end infotainment, body electronics, and telematics systems.
LT8609AIMSE16#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.782V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 3A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT8609AIMSE16#TRPBF FAQ
1.How can I place an order for LT8609AIMSE16#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AIMSE16#TRPBF 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 LT8609AIMSE16#TRPBF reliable?
The price and inventory of LT8609AIMSE16#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AIMSE16#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8609AIMSE16#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AIMSE16#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AIMSE16#TRPBF?
LT8609AIMSE16#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AIMSE16#TRPBF 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 LT8609AIMSE16#TRPBF?
For technical support, including LT8609AIMSE16#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AIMSE16#TRPBF requirements.
6.How does Aetrix verify that LT8609AIMSE16#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8609AIMSE16#TRPBF 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 LT8609AIMSE16#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8609AIMSE16#TRPBF?
All LT8609AIMSE16#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AIMSE16#TRPBF, 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 LT8609AIMSE16#TRPBF part is unused and in its original packaging.
Return procedure for LT8609AIMSE16#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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