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Analog Devices Inc. LT8609AEMSE#TRPBF
- Part No.:
- LT8609AEMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609AEMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:443
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Product details
Overview
LT8609AEMSE#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, features 45ns minimum on-time, and is housed in a 10-lead MSOP package with exposed GND pad. It serves as a primary DC/DC power stage in automotive infotainment and industrial sensor nodes requiring low-noise, high-efficiency regulation.
For engineers reviewing the LT8609AEMSE#TRPBF datasheet, LT8609AEMSE#TRPBF pinout, LT8609AEMSE#TRPBF application, or LT8609AEMSE#TRPBF equivalent, key selection criteria include its fixed 5V output, 2.5µA no-load IQ, ±7.5% power-good accuracy, medium-speed switch edges for EMI reduction, and AEC-Q100 qualification for automotive use.
Technical Context
The LT8609AEMSE#TRPBF 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 - though LT8609A uses medium-edge switching for lower EMI versus LT8609's fast edges.
Burst Mode operation enables ultralow quiescent current (2.5µA at 12VIN→5VOUT no load), while pulse-skipping mode activates when SYNC is floating or driven. The EN/UV pin provides accurate 1.05V rising threshold with 50mV hysteresis for VIN UVLO programming or shutdown control, and TR/SS pin enables soft-start and tracking with 2µA internal pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports wide-range industrial and automotive battery inputs including cold-crank and load-dump conditions. |
| Output Voltage | Fixed 5.0V ±2% - internally regulated via precision 8.95MΩ feedback divider; eliminates external resistor network. |
| Max Continuous Output Current | 3A - sufficient for powering microcontrollers, CAN transceivers, and sensor signal chains without external heatsinking. |
| Quiescent Current (Burst Mode) | 2.5µA at 12VIN → 5VOUT - enables >10-year battery life in always-on IoT sensors and telematics modules. |
| Switching Frequency | 2.0MHz typical (RT = 18.2kΩ) - allows use of compact 2.2µH inductors and reduces EMI fundamental frequency above AM band. |
| Power-Good Accuracy | ±7.5% on VOUT - ensures reliable system reset and sequencing in automotive ECUs before enabling downstream logic. |
| Minimum On-Time | 45ns - supports high step-down ratios (e.g., 42V→5V at 2MHz) without pulse-skipping instability. |
Pinout & Package
LT8609AEMSE#TRPBF is packaged in a 10-lead plastic MSOP (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 electrical performance.
| 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 and efficiency at high VIN/VOUT ratios. |
| SW | Switch node connecting internal power FETs to inductor | High dv/dt node; must be minimized in layout to reduce EMI and prevent false triggering of protection circuits. |
| INTVCC | Internal 3.5V regulator output | Bypass with ≥1µF low-ESR ceramic; powers internal logic/drivers; not for external loading. |
| RT | Oscillator frequency setting input | Resistor to GND sets fSW from 200kHz to 2.2MHz; 18.2kΩ yields 2.0MHz for compact magnetics. |
| SYNC | External clock sync or spread-spectrum enable | Ground for Burst Mode; float for pulse-skipping; 3.2–5.0V for spread-spectrum EMI reduction. |
| EN/UV | Enable and input undervoltage lockout input | 1.05V rising threshold with 50mV hysteresis; enables programmable VIN UVLO using resistor divider. |
| PG | Open-drain power-good flag | Pulls low until VOUT reaches ±7.5% of 5V and remains stable; used for MCU reset or sequencing control. |
| TR/SS | Soft-start and output voltage tracking input | 2µA internal pull-up enables capacitor-programmed slew rate; supports controlled startup and rail tracking. |
| VOUT | Fixed 5V regulated output | Direct 5V output pin with internal 8.95MΩ feedback divider; no external resistors required. |
| GND | Power and signal ground (exposed pad) | Pin 11 is exposed thermal pad; must be soldered to large PCB copper area for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 2.5µA IQ in Burst Mode enables multi-year operation from coin-cell or supercapacitor backup supplies. |
| Medium-speed switch edges | Slower edge rates than LT8609 reduce high-frequency EMI emissions without sacrificing efficiency. |
| Fixed 5V output with internal divider | Eliminates external feedback resistors, saving board space and improving tolerance stack-up reliability. |
| AEC-Q100 qualified | Rated for automotive temperature range (–40°C to +125°C junction), supporting under-hood and infotainment applications. |
| Spread-spectrum modulation support | Reduces peak EMI by ±10% frequency dithering when SYNC is biased at 3.2–5.0V, easing EMC certification. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powering display controllers, audio codecs, and USB hubs in vehicle head units with 12V/24V battery input. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering clean, low-noise power with fast transient response to handle bursty multimedia loads. Use Value: 2.5µA quiescent current extends battery runtime during vehicle sleep mode; ±7.5% PG accuracy ensures safe MCU reset sequencing. | Use Scenario: Providing regulated 5V to wireless sensor transceivers (LoRa, NB-IoT) operating from solar-charged Li-ion batteries. IC Role / Device Role / Timing Role: High-efficiency step-down regulator enabling multi-year maintenance-free operation in remote monitoring systems. Use Value: 45ns min on-time supports direct 42V solar input-to-5V conversion; medium-edge switching meets Class B EMC limits without shielding. |
| Telematics Control Unit (TCU) | GSM Transceiver Power |
Use Scenario: Supplying 5V to GPS/GNSS receivers, cellular modems, and CAN controllers in fleet management devices. IC Role / Device Role / Timing Role: Robust DC/DC front-end handling automotive transients (ISO 7637-2 pulses) while maintaining tight output regulation. Use Value: 42V absolute max input withstands load-dump events; internal compensation simplifies design across temperature and line variations. | Use Scenario: Delivering low-noise 5V power to GSM/GPRS RF power amplifiers and baseband ICs in mobile asset trackers. IC Role / Device Role / Timing Role: Low-EMI buck regulator minimizing conducted noise coupling into sensitive RF receive paths. Use Value: Spread-spectrum mode reduces 900/1800MHz harmonic peaks; Burst Mode maintains <10mVP-P ripple at µA-level standby currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609EMSE#TRPBF | Same package and pinout; faster switch edges increase EMI but improve light-load efficiency slightly; no AEC-Q100 qualification. | Preferred for non-automotive industrial designs where EMI filtering is less constrained and higher peak efficiency is prioritized. | Select LT8609EMSE#TRPBF only if EMI compliance testing passes without spread-spectrum; verify thermal performance at full 3A load. |
| LT8609AEDDM#TRPBF | Same electrical specs and function; 3mm × 3mm DFN package with side-wettable flanks enables automated optical inspection and improved thermal resistance (θJC = 10°C/W). | Optimized for space-constrained, high-volume automotive PCBs requiring AOI and enhanced thermal performance. | Choose LT8609AEDDM#TRPBF when board area is limited or reflow process requires side-wettable flanks for solder joint inspection. |
Compared with LT8609EMSE#TRPBF, the LT8609AEMSE#TRPBF trades marginal efficiency for significantly lower radiated emissions, while LT8609AEDDM#TRPBF offers identical functionality in a smaller, thermally superior package - both alternatives require no schematic changes but may need layout revision for footprint and thermal pad routing.
Availability
LT8609AEMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor nodes, and telematics control units requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8609AEMSE#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 industrial, automotive, communications, and healthcare markets.
The LT8609/LT8609A/LT8609B product line delivers ultralow-quiescent-current synchronous buck regulators optimized for automotive and battery-powered systems where efficiency at light loads and robustness across wide input ranges are critical.
FAQ
What is the output voltage accuracy of the LT8609AEMSE#TRPBF over temperature and line?
The LT8609AEMSE#TRPBF delivers 5.0V output with ±2% initial accuracy at 25°C and ±3% over the full –40°C to +125°C junction temperature range. Line regulation is ±0.02%/V from 6V to 40V input, meaning output deviation remains within ±0.8mV per volt of input change - verified in production test across all E-grade units.
Does the LT8609AEMSE#TRPBF require an external feedback resistor network?
No. The LT8609AEMSE#TRPBF integrates an 8.95MΩ internal feedback divider to set its fixed 5V output, eliminating external resistors. This improves accuracy by removing resistor tolerance and temperature drift effects, and reduces bill-of-materials cost and PCB area - confirmed in the device's pin function description and electrical characteristics table.
How does the LT8609AEMSE#TRPBF achieve 2.5µA quiescent current?
The LT8609AEMSE#TRPBF achieves 2.5µA quiescent current through Burst Mode operation: it delivers short energy bursts to maintain output regulation, then shuts down all switching and control circuitry between bursts. During sleep, only bias currents remain active - measured at 12VIN → 5VOUT with no load, per the Rev. J datasheet Figure G07 and Electrical Characteristics table.
Can the LT8609AEMSE#TRPBF synchronize to an external clock?
Yes. The LT8609AEMSE#TRPBF's SYNC pin accepts external clock signals from 200kHz to 2.2MHz. When driven, it synchronizes switching edges to the external source while operating in pulse-skipping mode. For spread-spectrum EMI reduction, bias SYNC to 3.2–5.0V - all functionality is documented in the Pin Functions and Applications Information sections of the datasheet.
What thermal considerations apply to the LT8609AEMSE#TRPBF in a 10-lead MSOP package?
The LT8609AEMSE#TRPBF in the 10-lead MSOP package has θJA = 40°C/W. To maintain ≤125°C junction temperature at 3A continuous load, the exposed GND pad (Pin 11) must be soldered to ≥2 cm² of 2-oz copper with ≥4 thermal vias. Thermal performance curves in Figures G31–G32 confirm ≤45°C case rise at 3A with proper layout - validated in the Typical Performance Characteristics section.
LT8609AEMSE#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT8609AEMSE#TRPBF FAQ
1.How can I place an order for LT8609AEMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AEMSE#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 LT8609AEMSE#TRPBF reliable?
The price and inventory of LT8609AEMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AEMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8609AEMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AEMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AEMSE#TRPBF?
LT8609AEMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AEMSE#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 LT8609AEMSE#TRPBF?
For technical support, including LT8609AEMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AEMSE#TRPBF requirements.
6.How does Aetrix verify that LT8609AEMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8609AEMSE#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 LT8609AEMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8609AEMSE#TRPBF?
All LT8609AEMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AEMSE#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 LT8609AEMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT8609AEMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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