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Analog Devices Inc. LT8609AIMSE16#PBF
- Part No.:
- LT8609AIMSE16#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609AIMSE16#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:139
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Product details
Overview
LT8609AIMSE16#PBF from Analog Devices is a 42V, 3A synchronous step-down regulator in a 16-lead MSOP package with fixed 5V output, 2.5µA quiescent current in Burst Mode, 2MHz switching frequency, and AEC-Q100 qualification for automotive power rails.
For engineers reviewing the LT8609AIMSE16#PBF datasheet, LT8609AIMSE16#PBF pinout, LT8609AIMSE16#PBF application, or LT8609AIMSE16#PBF equivalent, key selection criteria include ultralow IQ regulation at 12VIN→5VOUT, ±7.5% power-good accuracy, spread-spectrum EMI reduction, and thermal performance up to 125°C junction temperature.
Technical Context
The LT8609AIMSE16#PBF implements peak current mode control with internal compensation, enabling fast transient response and stable operation with small inductors. Its fixed 5V output eliminates external feedback resistors and uses an internal 8.95MΩ divider referenced to 0.782V.
Burst Mode operation maintains <10mVP-P output ripple while delivering regulated 5V output down to microamp loads; the SYNC pin supports external clock synchronization or spread-spectrum modulation to reduce conducted and radiated EMI without layout changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports wide automotive battery transients including cold-crank (4.5V) and load-dump (40V). |
| Output Voltage | Fixed 5.0V ±1.5% - factory-trimmed; no external resistor network required for regulation. |
| Max Continuous Output Current | 3A - enables single-regulator power for microcontrollers, sensors, and CAN transceivers. |
| Quiescent Current | 2.5µA at 12VIN→5VOUT - sustains >10-year battery life in always-on automotive modules. |
| Switching Frequency | 2.0MHz typical (RT = 18.2kΩ) - allows use of compact 2.2µH inductors and avoids AM radio band. |
| Power-Good Accuracy | ±7.5% on VOUT - ensures reliable system reset timing for downstream logic and processors. |
| Minimum On-Time | 45ns - supports high VIN-to-VOUT ratios (e.g., 42V→5V) without pulse-skipping instability. |
Pinout & Package
LT8609AIMSE16#PBF is housed in a 16-lead plastic MSOP package with exposed thermal pad (Pin 17 = GND), θJA = 40°C/W, requiring soldering of the exposed pad to PCB for thermal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap Supply | Drives high-side NMOS gate above VIN; requires 0.1µF ceramic capacitor to SW. |
| SW | Switch Node | Connects to inductor and BST capacitor; must be minimized in PCB area to reduce EMI. |
| INTVCC | Internal 3.5V Regulator Bypass | Supplies internal drivers; bypass with ≥1µF low-ESR ceramic to GND. |
| RT | Frequency Set Resistor | Resistor to GND sets fSW (2.0MHz @ 18.2kΩ); enables precise EMI tuning. |
| SYNC | External Clock Input | Accepts 0–5V logic; enables synchronization or spread-spectrum modulation. |
| EN/UV | Enable / Input UVLO Control | 1.05V rising threshold; resistor divider from VIN programs custom UVLO point. |
| VIN | Main Power Input | Supplies IC core and top switch; requires local 1µF+ ceramic input capacitor. |
| PG | Power-Good Flag | Open-drain output asserts high when VOUT is within ±7.5% and no fault exists. |
| TR/SS | Soft-Start / Tracking | Capacitor-programmable voltage ramp; enables controlled startup and supply sequencing. |
| FB | Feedback Input | Not connected internally on fixed-output LT8609A-5; unused pin in this variant. |
| VOUT | Regulated Output | 5.0V output node; connects to internal 8.95MΩ divider; supplies load directly. |
| GND | Ground Reference | Exposed pad (Pin 17) must be soldered to PCB ground plane for thermal and electrical performance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Rated for automotive applications across –40°C to +125°C junction temperature. |
| Ultralow Quiescent Current | 2.5µA IQ enables always-on systems (e.g., telematics, ADAS sensors) with multi-year battery life. |
| Spread-Spectrum Modulation | Reduces peak EMI by spreading switching energy over 1–6kHz bandwidth without filter redesign. |
| Fast Minimum On-Time | 45ns enables high-step-down ratios (e.g., 42V→5V at 2MHz) without duty-cycle limitation. |
| Integrated Soft-Start | TR/SS pin allows user-defined output ramp rate to prevent inrush current and rail collapse. |
Applications
| Automotive Telematics Module | GSM Transceiver Power |
|---|---|
Use Scenario: Powering LTE modem, GPS receiver, and CAN controller in vehicle tracking units with battery backup. IC Role / Device Role / Timing Role: Primary 5V system rail regulator with low-noise Burst Mode operation during sleep states. Use Value: 2.5µA IQ extends 12Ah backup battery life beyond 10 years; ±7.5% PG flag ensures clean MCU reset. | Use Scenario: Supplying 5V to GSM/GPRS RF transceivers requiring burst-mode current delivery and low standby consumption. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter supporting pulsed 2A transmit peaks and µA receive modes. Use Value: 45ns min-on-time prevents dropout during 42V cold-crank; 2MHz switching avoids interference with cellular bands. |
| Industrial Sensor Hub | Low-EMI Automotive Camera |
Use Scenario: Powering MEMS accelerometers, temperature sensors, and BLE radios in battery-operated IIoT nodes. IC Role / Device Role / Timing Role: Single-chip 5V supply with programmable soft-start for synchronized sensor initialization. Use Value: TR/SS-controlled ramp prevents false triggers during power-up; spread-spectrum meets CISPR-25 Class 5 limits. | Use Scenario: Providing clean 5V power to image sensor and ISP in rear-view camera modules near ECU harnesses. IC Role / Device Role / Timing Role: Low-ripple, low-EMI regulator co-located on camera PCB to minimize noise coupling. Use Value: <10mVP-P ripple ensures analog video signal integrity; AEC-Q100 qualification guarantees reliability in under-hood environments. |
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#PBF | Same 5V fixed output, but in 10-lead MSOP; lacks SYNC pin functionality in 16-lead variant. | Lower pin count suits space-constrained layouts; no spread-spectrum capability limits EMI-sensitive designs. | Select when board area is critical and EMI requirements are moderate (e.g., non-automotive industrial). |
| LT8609AIMSE#PBF | Same 5V output and temperature grade, but 10-lead MSOP with NC pins replacing RT/SYNC/TR/SS functions. | Fixed-frequency only (no RT adjustment or SYNC control); simplified design but no EMI tuning or soft-start control. | Choose for cost-sensitive, high-volume applications where flexibility is not required. |
Compared with LT8609AIMSE16#PBF, the 10-lead LT8609AIMSE#PBF sacrifices frequency programming and spread-spectrum EMI control for smaller footprint, while LT8609AEMSE#PBF offers identical features in a more compact package but omits SYNC functionality entirely.
Availability
LT8609AIMSE16#PBF is available at Aetrix Electronics and suitable for automotive telematics, industrial sensor hubs, and low-EMI camera modules requiring stable component supply across extended temperature ranges.
Supply support for LT8609AIMSE16#PBF 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 precision, power, and RF markets.
The LT8609A product line delivers ultralow-quiescent-current synchronous buck regulators optimized for automotive and industrial applications demanding high efficiency at light loads and robust EMI performance.
FAQ
What is the output voltage tolerance of the LT8609AIMSE16#PBF?
The LT8609AIMSE16#PBF provides a fixed 5.0V output with initial accuracy of ±1.5% over temperature and line, and load regulation better than ±0.2% across 0–3A. This tight tolerance ensures compatibility with 5V-tolerant microcontrollers and peripherals without additional post-regulation.
Does the LT8609AIMSE16#PBF require external feedback resistors?
No, the LT8609AIMSE16#PBF does not require external feedback resistors. It integrates an internal 8.95MΩ resistor divider that references the 0.782V internal bandgap to deliver a precise 5.0V output - eliminating component count and layout sensitivity associated with external resistor networks.
How does the SYNC pin function on the LT8609AIMSE16#PBF?
The SYNC pin on the LT8609AIMSE16#PBF accepts external clock signals (200kHz–2.2MHz) for synchronization or enables spread-spectrum modulation when biased between 3.2V–5.0V. Grounding SYNC activates low-ripple Burst Mode; floating it enables pulse-skipping mode - all configurable without changing the LT8609AIMSE16#PBF's hardware layout.
What thermal considerations apply to the LT8609AIMSE16#PBF in a 16-lead MSOP package?
The LT8609AIMSE16#PBF in its 16-lead MSOP package has θJA = 40°C/W and requires soldering of the exposed thermal pad (Pin 17) to a PCB ground plane. At 3A continuous load with 12VIN→5VOUT, proper thermal design keeps junction temperature below 125°C - validated per AEC-Q100 Grade I specifications.
Can the LT8609AIMSE16#PBF operate during automotive cold-crank conditions?
Yes, the LT8609AIMSE16#PBF supports input voltages down to 3.0V and operates continuously through automotive cold-crank events (as low as 4.5V for 15 seconds). Its 45ns minimum on-time and peak current mode architecture maintain regulation even at extreme duty cycles, ensuring uninterrupted power to safety-critical ECUs.
LT8609AIMSE16#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT8609AIMSE16#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AIMSE16#PBF 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#PBF reliable?
The price and inventory of LT8609AIMSE16#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AIMSE16#PBF is usually 5 days.
3.What payment methods are accepted for LT8609AIMSE16#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AIMSE16#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AIMSE16#PBF?
LT8609AIMSE16#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AIMSE16#PBF 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#PBF?
For technical support, including LT8609AIMSE16#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AIMSE16#PBF requirements.
6.How does Aetrix verify that LT8609AIMSE16#PBF is sourced from the original manufacturer or authorized distributors?
All LT8609AIMSE16#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT8609AIMSE16#PBF?
All LT8609AIMSE16#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AIMSE16#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT8609AIMSE16#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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