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Analog Devices Inc. LT8609AJMSE16#PBF
- Part No.:
- LT8609AJMSE16#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609AJMSE16#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:484
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Product details
Overview
LT8609AJMSE16#PBF from Analog Devices is a 42V, 3A synchronous step-down regulator with 2.5µA quiescent current in Burst Mode, 2MHz switching frequency, ±7.5% power-good accuracy for fixed 5V output, and AEC-Q100 qualified operation up to 150°C junction temperature. It delivers high efficiency (>93% at 1A, 5VOUT from 12VIN) in automotive infotainment power rails.
For engineers reviewing the LT8609AJMSE16#PBF datasheet, LT8609AJMSE16#PBF pinout, LT8609AJMSE16#PBF application, or LT8609AJMSE16#PBF equivalent, key selection criteria include ultralow IQ regulation, fixed 5V output with PG flag, spread spectrum EMI reduction, 16-lead MSOP thermal performance (θJA = 40°C/W), and automotive-grade temperature range (–40°C to 150°C).
Technical Context
The LT8609AJMSE16#PBF implements peak current mode control with internal compensation, enabling fast transient response and stable loop behavior using small inductors. Its 45ns minimum on-time supports high VIN-to-VOUT step-down ratios while maintaining regulation at 2MHz.
Burst Mode operation maintains <10mVP-P output ripple down to microamp load levels, and the SYNC pin enables external clock synchronization or spread spectrum modulation-critical for CISPR 25 Class 5 automotive EMI compliance. The EN/UV pin features a precise 1.05V rising threshold with 50mV hysteresis for reliable input UVLO programming.
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, no external feedback resistors required; ±7.5% PG window ensures robust rail monitoring |
| Max Continuous Output Current | 3A - sustained delivery with thermal derating above 125°C junction temperature |
| Quiescent Current | 2.5µA at 12VIN/3.3VOUT - enables always-on systems with multi-year battery life in telematics |
| Switching Frequency | Adjustable 200kHz to 2.2MHz via RT resistor - allows optimization of size vs. efficiency; 2MHz enables compact 2.2µH inductor use |
| Power-Good Accuracy | ±7.5% on VOUT - tight fault detection window for 5V rail integrity in ADAS sensor modules |
| Operating Junction Temp | –40°C to 150°C - AEC-Q100 Grade 1 qualification enables under-hood deployment |
Pinout & Package
LT8609AJMSE16#PBF 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 grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side NMOS gate drive | Requires 0.1µF ceramic capacitor to SW; critical for top-FET turn-on voltage headroom |
| SW | Switch node | Connects to inductor and BST capacitor; must be minimized in layout to reduce EMI and switching losses |
| INTVCC | Internal 3.5V regulator bypass | Decoupled with ≥1µF low-ESR ceramic; powers gate drivers and control logic; not for external loading |
| RT | Oscillator frequency set | Resistor to GND sets fSW; 18.2kΩ yields 2MHz - enables compact magnetics and noise avoidance |
| SYNC | External clock/spectrum control | Ground for Burst Mode; float for pulse-skipping; 3.2–5V for spread spectrum - reduces peak EMI by >10dB |
| EN/UV | Enable and input UVLO input | 1.05V rising threshold with 50mV hysteresis - allows programmable VIN cutoff (e.g., 6V) via resistor divider |
| VIN | Main input power | Bypassed locally with low-ESR capacitor; feeds internal circuitry and top-FET; sensitive to layout parasitics |
| PG | Open-drain power-good flag | Asserts high when VOUT is within ±7.5% of 5V and no fault - used for system sequencing and fault reporting |
| TR/SS | Soft-start and tracking control | 2µA internal pull-up enables capacitor-programmed ramp rate; supports voltage sequencing with other rails |
| FB | Feedback reference input | Not connected in LT8609AJMSE16#PBF - fixed 5V version uses internal 8.95MΩ divider; FB pin is NC |
| VOUT | Regulated 5V output | Direct 5V output node; connects to load and output capacitor; PG monitors this pin directly |
| GND | Power and signal ground | Exposed pad (Pin 17) must be soldered to PCB ground plane for thermal and EMI performance |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 2.5µA input current at no-load 12VIN→5VOUT enables >10-year battery life in always-on vehicle modules |
| Spread Spectrum Modulation | 1–6kHz dither on switching frequency reduces peak radiated emissions by up to 15dB for CISPR 25 compliance |
| AEC-Q100 Qualified | Grade 1 (–40°C to +150°C) qualification confirmed for automotive power supply applications per stress test requirements |
| Fast Minimum On-Time | 45ns enables high step-down ratio operation (e.g., 42V→5V at 2MHz) without pulse skipping or instability |
| Integrated Power Good | PG flag with ±7.5% tolerance on VOUT provides deterministic rail monitoring for safety-critical ADAS subsystems |
Applications
| Automotive Infotainment | ADAS Camera Power |
|---|---|
Use Scenario: Powering display controllers, audio DSPs, and USB hubs in head units with battery input ranging from 5.5V (cold crank) to 40V (load dump). IC Role / Device Role / Timing Role: Primary 5V buck converter delivering 3A continuous current with ultralow IQ for standby mode. Use Value: 2.5µA quiescent current extends battery drain time during vehicle sleep; spread spectrum meets OEM EMI limits without added shielding. | Use Scenario: Supplying image sensors and ISP processors in rear-view and surround-view cameras mounted near engine compartments. IC Role / Device Role / Timing Role: High-reliability 5V regulator operating continuously at 125°C ambient with AEC-Q100 Grade 1 qualification. Use Value: 150°C junction rating and thermal pad design ensure stable 5V output under hood temperatures; PG flag enables camera reset on rail fault. |
| Telematics Control Unit | Vehicle Gateway Module |
Use Scenario: Providing clean 5V power to LTE modems, GNSS receivers, and CAN transceivers in cellular-connected TCU designs. IC Role / Device Role / Timing Role: Input-filter tolerant buck regulator handling 42V transients while maintaining low-noise 5V output for RF-sensitive circuits. Use Value: 45ns min on-time prevents dropout during high-VIN transients; 10mVP-P ripple avoids modem bit errors. | Use Scenario: Powering multi-protocol gateway SoCs that interface CAN FD, LIN, and Ethernet PHYs in central domain controllers. IC Role / Device Role / Timing Role: Main 5V supply with soft-start (TR/SS) for controlled power-up sequencing across multiple voltage domains. Use Value: Capacitor-programmable TR/SS ramp rate prevents inrush current on downstream LDOs and FPGAs during cold boot. |
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 |
|---|---|---|---|
| LT8609AIMSE16#PBF | Same 16-lead MSOP package and 5V fixed output, but rated for –40°C to 125°C junction temperature (not 150°C) | Not qualified for under-hood or high-ambient environments requiring >125°C operation | Select LT8609AJMSE16#PBF when AEC-Q100 Grade 1 (150°C) operation is mandatory; choose LT8609AIMSE16#PBF for cabin-mounted modules with lower thermal stress |
| LT8609AEMSE16#PBF | Same pinout and function, but specified for –40°C to 125°C and industrial temperature grade (E-grade) | Lacks AEC-Q100 qualification and automotive reliability testing; not approved for automotive production | Use LT8609AEMSE16#PBF only in non-automotive industrial or consumer applications where automotive qualification is unnecessary |
Compared with LT8609AIMSE16#PBF and LT8609AEMSE16#PBF, the LT8609AJMSE16#PBF uniquely supports 150°C junction operation with full AEC-Q100 Grade 1 validation-enabling direct replacement in high-temperature automotive locations without thermal derating or redesign.
Availability
LT8609AJMSE16#PBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera power, and telematics control unit designs requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LT8609AJMSE16#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 automotive, industrial, communications, and healthcare markets.
The LT8609A product line delivers ultralow-quiescent-current synchronous buck regulators optimized for automotive and battery-powered systems where efficiency at light loads and EMI compliance are critical design constraints.
FAQ
What is the maximum junction temperature rating for LT8609AJMSE16#PBF?
The LT8609AJMSE16#PBF is rated for a maximum junction temperature of 150°C and is AEC-Q100 Grade 1 qualified. This specification is validated across the full –40°C to 150°C operating junction temperature range, making it suitable for under-hood automotive applications where ambient temperatures exceed 105°C. Thermal design must ensure the exposed pad (Pin 17) is soldered to a sufficient copper area to maintain safe junction temperatures under 3A load.
Does LT8609AJMSE16#PBF require external feedback resistors for its 5V output?
No, the LT8609AJMSE16#PBF does not require external feedback resistors. It is a fixed 5V output variant with an internal 8.95MΩ feedback divider network connected to the VOUT pin. The FB pin is not used and remains unconnected in this configuration. This simplifies layout, improves accuracy over temperature (±7.5% PG window), and eliminates resistor tolerance drift effects on output regulation.
How does the SYNC pin function on LT8609AJMSE16#PBF?
On the LT8609AJMSE16#PBF, the SYNC pin supports three modes: grounded for low-ripple Burst Mode operation (IQ = 2.5µA), floated for pulse-skipping mode, or biased between 3.2V and 5.0V for spread spectrum modulation. In spread spectrum mode, the switching frequency dithers 1–6kHz to reduce peak EMI emissions-critical for passing CISPR 25 Class 5 automotive EMC tests without additional filtering.
What is the purpose of the TR/SS pin on LT8609AJMSE16#PBF?
The TR/SS pin on LT8609AJMSE16#PBF provides soft-start and voltage tracking capability. An internal 2µA current source pulls the pin up, allowing a capacitor to program the output voltage ramp rate during startup. For the fixed 5V version, the output tracks TR/SS at a 6.39× gain-enabling coordinated sequencing with other rails. During fault or shutdown, a 300Ω MOSFET pulls TR/SS to ground, ensuring controlled discharge.
Is LT8609AJMSE16#PBF pin-compatible with other LT8609A variants in the 16-lead MSOP package?
Yes, the LT8609AJMSE16#PBF shares identical pinout, footprint, and thermal pad configuration with all other LT8609A variants in the 16-lead MSOP package (e.g., LT8609AIMSE16#PBF, LT8609AEMSE16#PBF). All share the same 16-pin assignment, including NC on FB and functional VOUT. However, temperature grade and qualification differ-LT8609AJMSE16#PBF is the only one rated for 150°C junction and AEC-Q100 Grade 1.
LT8609AJMSE16#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT8609AJMSE16#PBF FAQ
1.How can I place an order for LT8609AJMSE16#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AJMSE16#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 LT8609AJMSE16#PBF reliable?
The price and inventory of LT8609AJMSE16#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AJMSE16#PBF is usually 5 days.
3.What payment methods are accepted for LT8609AJMSE16#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AJMSE16#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AJMSE16#PBF?
LT8609AJMSE16#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AJMSE16#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 LT8609AJMSE16#PBF?
For technical support, including LT8609AJMSE16#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AJMSE16#PBF requirements.
6.How does Aetrix verify that LT8609AJMSE16#PBF is sourced from the original manufacturer or authorized distributors?
All LT8609AJMSE16#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 LT8609AJMSE16#PBF meets industry standards.
7.What is the process for return or replacement of LT8609AJMSE16#PBF?
All LT8609AJMSE16#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AJMSE16#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 LT8609AJMSE16#PBF part is unused and in its original packaging.
Return procedure for LT8609AJMSE16#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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