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Analog Devices Inc. LT8609AHMSE#TRPBF
- Part No.:
- LT8609AHMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609AHMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,687
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Product details
Overview
LT8609AHMSE#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 AEC-Q100 qualification for automotive applications. It delivers regulated 5V output from 6–40V input in a 10-lead MSOP package with side-wettable flanks, supporting GSM transceivers and low-EMI industrial power rails.
For engineers reviewing the LT8609AHMSE#TRPBF datasheet, LT8609AHMSE#TRPBF pinout, LT8609AHMSE#TRPBF application, or LT8609AHMSE#TRPBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, automotive-grade thermal performance (–40°C to 150°C), and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The LT8609AHMSE#TRPBF 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 at 2MHz switching frequency.
Burst Mode operation maintains <10mVP-P output ripple while drawing only 2.5µA IQ at light load (12VIN→5VOUT), and the SYNC pin enables external clock synchronization or spread-spectrum modulation for EMI reduction. 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 and industrial 24/36V rails without pre-regulation. |
| Output Current | 3A continuous - sustains full load under worst-case thermal conditions (TJ ≤ 150°C) in MSOP package. |
| Quiescent Current | 2.5µA at no load (12VIN→5VOUT) - enables >10-year battery life in always-on automotive modules. |
| Switching Frequency | 2.00MHz (RT = 18.2kΩ) - allows use of compact 2.2µH inductors and reduces EMI fundamental frequency. |
| Feedback Reference | 0.782V ±0.004V - enables precise output regulation with minimal line/load error across temperature. |
| PG Accuracy | ±7.5% on VOUT - provides tight power-good assertion for downstream microcontrollers in safety-critical systems. |
| Min On-Time | 45ns - supports 5V output from 40V input at 2MHz without pulse-skipping instability. |
Pinout & Package
LT8609AHMSE#TRPBF uses a 10-lead plastic MSOP package (MSE) with exposed GND pad (Pin 11) requiring PCB soldering for thermal and electrical integrity. θJA = 40°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side NMOS gate drive | Requires 0.1µF ceramic capacitor to SW; enables efficient 42V operation with low RDS(on) top switch. |
| SW | Switch node connecting internal power FETs to inductor | High di/dt node; must be minimized on PCB to reduce EMI and voltage spikes. |
| INTVCC | Internal 3.5V regulator bypass | Must be decoupled with ≥1µF low-ESR ceramic; powers gate drivers and control logic. |
| RT | Resistor-based oscillator frequency setting | 18.2kΩ to GND sets 2.00MHz switching - critical for EMI compliance and inductor size selection. |
| SYNC | External clock sync or spread-spectrum enable | Ground for Burst Mode; float for pulse-skipping; 3.2–5.0V for low-EMI spread spectrum. |
| EN/UV | Enable and input undervoltage lockout control | 1.05V rising threshold with 50mV hysteresis - allows programmable VIN UVLO via resistor divider. |
| PG | Open-drain power-good flag | Pulls low until VOUT within ±7.5%; valid above 3.2V VIN - used for MCU reset sequencing. |
| TR/SS | Soft-start and output voltage tracking | 2µA internal pull-up enables capacitor-programmed slew rate; supports power-rail sequencing. |
| FB | Feedback input for adjustable-output regulation | Regulated to 0.782V - used with external resistor divider to set output voltage (not applicable to LT8609A-5 variant). |
| VIN | Main input power supply | Must be locally bypassed with low-ESR capacitor; connects to internal circuitry and top switch source. |
| GND | Power and signal ground reference | Exposed pad (Pin 11) must be soldered to PCB plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Rated for automotive junction temperatures up to 150°C - meets reliability requirements for engine bay and ADAS applications. |
| Burst Mode efficiency | 2.5µA IQ at no load preserves battery energy in always-on systems without sacrificing <10mVP-P ripple. |
| Spread-spectrum modulation | Reduces peak EMI by spreading switching energy over 1–6kHz bandwidth - simplifies CISPR 25 Class 5 compliance. |
| Internal compensation | Eliminates external compensation components - reduces BOM count and layout sensitivity for robust production yield. |
| Fast minimum on-time | 45ns enables high step-down ratio (e.g., 40V→5V) at 2MHz - avoids subharmonic oscillation and improves light-load stability. |
| Accurate PG flag | ±7.5% VOUT window ensures deterministic power sequencing for sensitive processors and FPGAs. |
Applications
| GSM Transceiver Power | Automotive Infotainment Core Rail |
|---|---|
Use Scenario: Powering RF transceiver ICs in cellular-connected telematics units with 12V/24V vehicle battery input. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering clean, low-noise power with fast transient response to handle burst TX current demands. Use Value: 2.5µA quiescent current extends battery backup runtime during ignition-off; 2MHz switching avoids interference with GSM band frequencies. |
Use Scenario: Generating stable 5V core supply for SoCs and display controllers in head-unit systems operating across –40°C to 105°C ambient. IC Role / Device Role / Timing Role: High-reliability synchronous buck regulator with AEC-Q100 qualification and ±7.5% PG accuracy for safe boot sequencing. Use Value: 150°C junction rating enables operation in sealed enclosures; internal compensation reduces layout risk in high-volume automotive manufacturing. |
| Industrial IoT Sensor Hub | Low-EMI Industrial PLC I/O Module |
Use Scenario: Powering ultra-low-power microcontrollers and wireless radios in battery- or energy-harvesting–powered edge sensors. IC Role / Device Role / Timing Role: Efficient step-down regulator maintaining regulation down to µA loads while minimizing self-heating in sealed housings. Use Value: Burst Mode IQ of 2.5µA enables multi-year operation on coin cells; 45ns min on-time supports wide input range from solar or PoE-derived supplies. |
Use Scenario: Providing isolated 5V rail for analog front-end and digital logic in DIN-rail mounted PLC modules subject to strict EMC standards. IC Role / Device Role / Timing Role: Low-EMI buck converter with spread-spectrum modulation and optimized layout for CISPR 25/EN 55032 Class B compliance. Use Value: SYNC pin configurable for spread spectrum reduces peak radiated emissions by >10dB; side-wettable flanks enable automated optical inspection (AOI) of solder joints. |
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 |
|---|---|---|---|
| LT8609AIMSE#TRPBF | Same architecture and pinout, but rated for –40°C to 125°C junction temperature (vs. 150°C for LT8609AHMSE#TRPBF). | Not qualified for under-hood automotive use where sustained 150°C junction is required. | Select when ambient temperature stays below 105°C and cost optimization is prioritized over extended thermal margin. |
| LT8609AEMSE#TRPBF | Same functionality, but specified for –40°C to 125°C and offered in commercial temperature grade only. | Lacks AEC-Q100 qualification and high-temperature validation - unsuitable for automotive or harsh industrial environments. | Choose for cost-sensitive consumer or non-automotive industrial designs where 125°C max junction suffices. |
Compared with LT8609AIMSE#TRPBF and LT8609AEMSE#TRPBF, the LT8609AHMSE#TRPBF provides guaranteed operation up to 150°C junction temperature and formal AEC-Q100 qualification - essential for engine control, ADAS, and other high-reliability automotive subsystems where thermal derating and process traceability are mandatory.
Availability
LT8609AHMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial IoT sensor nodes, and GSM telematics modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LT8609AHMSE#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 LT8609A product line delivers high-efficiency, low-EMI synchronous step-down regulation for automotive and industrial applications demanding ultralow quiescent current and AEC-Q100 reliability.
FAQ
What is the maximum junction temperature specification for LT8609AHMSE#TRPBF?
The LT8609AHMSE#TRPBF is guaranteed to operate continuously at a maximum junction temperature of 150°C, with full electrical specifications validated across –40°C to 150°C. This rating supports under-hood automotive placement and high-ambient industrial deployments where thermal margins are constrained. Derating curves in the datasheet define safe operating area based on PCB copper area and airflow.
Does LT8609AHMSE#TRPBF support fixed 5V output without external feedback resistors?
Yes, the LT8609AHMSE#TRPBF is the fixed 5V output variant of the LT8609A family. It integrates an internal 8.95MΩ feedback divider and regulates the VOUT pin directly to 5.00V ±7.5%, eliminating the need for external FB resistors. The FB pin is not used in this configuration and should remain unconnected.
How does the SYNC pin function on LT8609AHMSE#TRPBF?
On the LT8609AHMSE#TRPBF, the SYNC pin enables three operating modes: grounded for low-ripple Burst Mode, floated for pulse-skipping mode, or biased to 3.2–5.0V for spread-spectrum modulation. Unlike the LT8609B, it retains full SYNC functionality - critical for EMI-sensitive applications like automotive infotainment where spectral shaping is required.
What is the purpose of the exposed pad (Pin 11) on LT8609AHMSE#TRPBF?
The exposed pad (Pin 11) on LT8609AHMSE#TRPBF is electrically and thermally connected to GND. It must be soldered to a dedicated PCB copper pour to achieve the specified θJA = 40°C/W and ensure reliable operation at 3A continuous load. Failure to solder this pad results in excessive junction temperature rise and potential thermal shutdown.
Can LT8609AHMSE#TRPBF be used in designs requiring AEC-Q100 compliance?
Yes, the LT8609AHMSE#TRPBF is explicitly qualified per AEC-Q100 Rev H for automotive applications. It undergoes stress testing including HTOL, TC, UHAST, and ESD per automotive standards, and its 150°C junction rating satisfies Grade 1 (–40°C to +125°C ambient) and Grade 0 (–40°C to +150°C ambient) requirements when properly heatsinked.
LT8609AHMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT8609AHMSE#TRPBF FAQ
1.How can I place an order for LT8609AHMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AHMSE#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 LT8609AHMSE#TRPBF reliable?
The price and inventory of LT8609AHMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AHMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8609AHMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AHMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AHMSE#TRPBF?
LT8609AHMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AHMSE#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 LT8609AHMSE#TRPBF?
For technical support, including LT8609AHMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AHMSE#TRPBF requirements.
6.How does Aetrix verify that LT8609AHMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8609AHMSE#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 LT8609AHMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8609AHMSE#TRPBF?
All LT8609AHMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AHMSE#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 LT8609AHMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT8609AHMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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