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Analog Devices Inc. LT8609AIMSE#PBF
- Part No.:
- LT8609AIMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609AIMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:451
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Product details
Overview
LT8609AIMSE#PBF 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 200kHz–2.2MHz adjustable switching frequency. It delivers regulated 5V output from 12V input at >93% efficiency (1A load), features 45ns minimum on-time, and supports spread spectrum modulation for low EMI - ideal for automotive infotainment power rails.
For engineers reviewing the LT8609AIMSE#PBF datasheet, LT8609AIMSE#PBF pinout, LT8609AIMSE#PBF application, or LT8609AIMSE#PBF equivalent, key selection criteria include its 10-lead MSOP package with side-wettable flanks, AEC-Q100 qualification, fixed 5V output, ±7.5% power-good accuracy, and compatibility with 2.2µH inductors at 2MHz operation.
Technical Context
The LT8609AIMSE#PBF implements peak current mode control with internal 0.782V reference and fixed 5V output via integrated feedback divider (8.95MΩ). Its oscillator frequency is set by external RT resistor (18.2kΩ typical for 2MHz) and supports synchronization or spread spectrum modulation via SYNC pin to reduce EMI emissions.
Burst Mode operation enables ultralow IQ (2.5µA regulating 12VIN→5VOUT) while maintaining <10mVP-P output ripple; pulse-skipping mode is available when SYNC is floating. The device integrates top/bottom NMOS switches (185mΩ/115mΩ RDS(on)), 1V EN/UV threshold with 50mV hysteresis, and PG flag signaling VOUT within ±7.5% of regulation.
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 5V - internally trimmed to ±1% over temperature; eliminates external feedback resistors and saves board space. |
| Continuous Output Current | 3A - sufficient for powering microcontrollers, CAN transceivers, and display logic without external heatsinking. |
| Quiescent Current | 2.5µA in Burst Mode - enables always-on systems (e.g., telematics, alarm controllers) with multi-year battery life. |
| Switching Frequency | 200kHz to 2.2MHz - adjustable via RT pin; 2MHz operation allows use of compact 2.2µH inductors and reduces solution size. |
| Minimum On-Time | 45ns - enables high step-down ratios (e.g., 42VIN→5VOUT) without pulse-skipping instability at light loads. |
| Power-Good Accuracy | ±7.5% on VOUT - ensures reliable system reset sequencing and fault detection for downstream logic. |
Pinout & Package
LT8609AIMSE#PBF uses a 10-lead plastic MSOP package (MSE) with exposed thermal pad (Pin 11 = GND), θJA = 40°C/W. The exposed pad must be soldered to PCB ground plane for thermal and EMI performance.
| 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 gate drive. |
| SW | Switch node | Connects to inductor and BST capacitor; critical high-di/dt node requiring minimized PCB loop area. |
| INTVCC | Internal 3.5V regulator bypass | Must be decoupled with ≥1µF low-ESR ceramic capacitor to GND; powers internal drivers and control circuits. |
| RT | Frequency setting | Resistor to GND sets switching frequency (18.2kΩ → 2MHz); enables optimization of efficiency vs. size trade-offs. |
| SYNC | External clock interface | Accepts 0–5V logic; enables synchronization to external clock or spread spectrum modulation for EMI reduction. |
| EN/UV | Enable / input undervoltage lockout | 1.05V rising threshold with 50mV hysteresis; supports programmable VIN UVLO using external resistor divider. |
| PG | Power-good flag | Open-drain output asserting high when VOUT is within ±7.5% of 5V and no fault conditions exist. |
| TR/SS | Soft-start / tracking | Sources 2µA to charge external capacitor; controls output voltage ramp rate during startup and enables voltage tracking. |
| VOUT | Fixed 5V output | Regulated 5V output pin with internal 8.95MΩ feedback divider; connects directly to load and output capacitor. |
| GND | Ground reference | Exposed pad (Pin 11) must be soldered to PCB ground plane for thermal conduction and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Rated for automotive applications across –40°C to +125°C junction temperature, supporting under-hood and infotainment use. |
| Spread spectrum modulation | Reduces peak EMI by ±12% frequency dithering at 1–6kHz when SYNC is tied to 3.2–5V, easing CISPR 25 Class 5 compliance. |
| Internal compensation | Eliminates need for external compensation network, simplifying design and improving stability across all operating conditions. |
| Low dropout capability | Maintains regulation down to VIN − VOUT ≈ 0.8V at full load, enabling operation during automotive cold-crank events. |
| Side-wettable flanks | Enables automated optical inspection (AOI) of solder joints on 10-lead MSOP package, improving manufacturing yield and reliability. |
Applications
| GSM Transceiver Power | Automotive Infotainment Core Rail |
|---|---|
Use Scenario: Powering GSM/GPRS baseband processors and RF front-ends in telematics modules. IC Role / Device Role / Timing Role: Primary 5V buck converter supplying core logic and analog sections with low-noise, low-ripple output. Use Value: 2.5µA quiescent current extends battery backup runtime; 2MHz switching avoids AM radio band interference. |
Use Scenario: Generating stable 5V rail for MCU, display controller, and audio codec in head-unit designs. IC Role / Device Role / Timing Role: Fixed-output synchronous buck regulator delivering 3A continuous current with AEC-Q100 reliability. Use Value: ±7.5% PG accuracy ensures safe power sequencing; spread spectrum mode meets stringent automotive EMI limits. |
| Industrial IoT Sensor Hub | Low-EMI Point-of-Load Converter |
Use Scenario: Powering ARM Cortex-M based sensor fusion nodes in battery-powered condition monitoring systems. IC Role / Device Role / Timing Role: Always-on 5V supply with ultralow IQ enabling multi-year operation on primary lithium cells. Use Value: 45ns min-on-time supports direct 24V-to-5V conversion without intermediate stages, reducing BOM count. |
Use Scenario: Replacing linear regulators in noise-sensitive analog signal chains (e.g., precision ADCs, op-amps). IC Role / Device Role / Timing Role: Low-ripple synchronous buck providing clean 5V from 12V or 24V industrial bus. Use Value: <10mVP-P ripple in Burst Mode eliminates need for post-regulation LDOs; internal compensation ensures stability with ceramic output caps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609AEMSE#PBF | Same 5V fixed output, identical pinout and specs, but rated for –40°C to +125°C (E-grade) instead of I-grade. | No functional difference; E-grade has lower guaranteed temp range and may exhibit higher parametric drift at extremes. | Select LT8609AIMSE#PBF for designs requiring full industrial temperature validation across –40°C to +125°C. |
| LT8609AIMSE16#PBF | 16-lead MSOP package with NC pins; identical electrical specs but different pinout (e.g., SYNC relocated, FB replaced by VOUT). | Requires PCB redesign due to different footprint and pin assignment; offers same 5V output and AEC-Q100 rating. | Choose LT8609AIMSE16#PBF only if larger package improves thermal management or layout routing in high-power layouts. |
Compared with LT8609AEMSE#PBF, the LT8609AIMSE#PBF provides tighter thermal specification assurance across the full industrial range; compared with LT8609AIMSE16#PBF, it retains the compact 10-lead MSOP footprint while delivering identical 5V regulation and EMI performance.
Availability
LT8609AIMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial IoT sensor hubs, and GSM transceiver power supplies requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for LT8609AIMSE#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 industrial, automotive, communications, and healthcare markets.
The LT8609 family is part of Analog Devices' Power by Linear portfolio, designed specifically for high-efficiency, low-EMI, wide-input DC/DC conversion in space-constrained and thermally demanding environments.
FAQ
What is the guaranteed operating temperature range for LT8609AIMSE#PBF?
The LT8609AIMSE#PBF is guaranteed to operate across –40°C to +125°C junction temperature. This I-grade rating ensures full electrical specification compliance over the entire industrial temperature range, unlike E-grade variants which are characterized but not fully guaranteed at temperature extremes.
Does LT8609AIMSE#PBF require external feedback resistors for 5V output?
No, the LT8609AIMSE#PBF integrates an 8.95MΩ internal feedback divider to regulate precisely to 5V. This eliminates external resistors, reduces component count, improves accuracy, and removes resistor tolerance and temperature drift effects from the output voltage.
How does the SYNC pin function on LT8609AIMSE#PBF?
On the LT8609AIMSE#PBF, the SYNC pin accepts 0–5V logic: grounding enables Burst Mode for lowest IQ; floating enables pulse-skipping mode; applying 3.2–5V enables spread spectrum modulation to reduce EMI peaks; applying an external clock synchronizes switching frequency.
What is the purpose of the TR/SS pin on LT8609AIMSE#PBF?
The TR/SS pin on LT8609AIMSE#PBF sources a constant 2µA current to charge an external capacitor, controlling the 5V output voltage ramp rate during startup. It also enables output voltage tracking when driven by an external reference, useful for sequencing multiple rails.
Is LT8609AIMSE#PBF pin-compatible with LT8609AEMSE#PBF?
Yes, the LT8609AIMSE#PBF and LT8609AEMSE#PBF share identical 10-lead MSOP packaging, pinout, and electrical specifications - differing only in temperature grade (I-grade vs. E-grade) and associated test coverage. They are drop-in replacements in the same footprint.
LT8609AIMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (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:
- 10-MSOP-EP
LT8609AIMSE#PBF FAQ
1.How can I place an order for LT8609AIMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AIMSE#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 LT8609AIMSE#PBF reliable?
The price and inventory of LT8609AIMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AIMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8609AIMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AIMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AIMSE#PBF?
LT8609AIMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AIMSE#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 LT8609AIMSE#PBF?
For technical support, including LT8609AIMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AIMSE#PBF requirements.
6.How does Aetrix verify that LT8609AIMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8609AIMSE#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 LT8609AIMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8609AIMSE#PBF?
All LT8609AIMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AIMSE#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 LT8609AIMSE#PBF part is unused and in its original packaging.
Return procedure for LT8609AIMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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