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Analog Devices Inc. LT8609AEDDM#TRPBF
- Part No.:
- LT8609AEDDM#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8609AEDDM#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,739
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Product details
Overview
LT8609AEDDM#TRPBF from Analog Devices is a 42V, 3A synchronous step-down regulator in a 10-lead 3mm × 3mm side-wettable DFN package, featuring 2.5µA quiescent current in Burst Mode®, 45ns minimum on-time, and fixed 5V output. It delivers high efficiency (>93% at 1A, 5VOUT from 12VIN) with low EMI via spread spectrum modulation and supports automotive-grade operation (–40°C to 125°C).
For engineers reviewing the LT8609AEDDM#TRPBF datasheet, LT8609AEDDM#TRPBF pinout, LT8609AEDDM#TRPBF application, or LT8609AEDDM#TRPBF equivalent, key selection considerations include its fixed 5V output, side-wettable DFN thermal performance, AEC-Q100 qualification, and SYNC-enabled low-EMI operation - critical for automotive infotainment, ADAS power rails, and industrial IoT edge nodes.
Technical Context
The LT8609AEDDM#TRPBF implements peak current mode control with internal compensation, enabling fast transient response and stable operation with small inductors (e.g., 2.2µH). Its fixed 5V output eliminates external feedback resistors and uses an internal 8.95MΩ divider referenced to 0.782V FB voltage.
Burst Mode® operation maintains ultralow IQ (<2.5µA regulating 12VIN to 5VOUT) while holding output ripple below 10mVP-P; spread spectrum modulation (1–6kHz) on the SYNC pin reduces EMI peaks without sacrificing efficiency or regulation accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% (guaranteed over –40°C to 125°C junction temp) |
| Max Continuous Output Current | 3A - supports compact 5V rail generation for microcontrollers, sensors, and CAN transceivers without external current limiting |
| Input Voltage Range | 3.0V to 42V - enables direct battery connection in 12V/24V automotive and industrial systems |
| Quiescent Current (Burst Mode) | 2.5µA at no load - extends battery life in always-on telematics and ECU standby modes |
| Switching Frequency Range | 200kHz to 2.2MHz (RT-programmable); typical 2MHz with 18.2kΩ resistor - allows optimization of size vs. efficiency |
| Minimum On-Time | 45ns - enables high step-down ratios (e.g., 42V→5V at 2MHz) without pulse-skipping instability |
| Thermal Performance | θJA = 45°C/W, θJC = 10°C/W - side-wettable flanks enable reliable reflow inspection and enhanced heat dissipation in dense layouts |
Pinout & Package
LT8609AEDDM#TRPBF is housed in a 10-lead (3mm × 3mm) plastic side-wettable DFN package with exposed GND pad (Pin 11), requiring soldering to PCB for thermal and electrical integrity. Pin count and layout match the LT8609A family DFN variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 3.0–42V; requires local 1µF ceramic bypass to GND |
| BST | Bootstrap supply | Drives high-side NMOS gate; requires 0.1µF capacitor to SW |
| SW | Power switch node | Connects to inductor and BST capacitor; must be minimized for EMI control |
| INTVCC | Internal 3.5V regulator output | Bypass with ≥1µF ceramic; powers internal logic and drivers |
| RT | Frequency setting | Resistor to GND sets fSW (200kHz–2.2MHz); open = 2MHz default |
| SYNC | External clock/spectrum control | Ground = Burst Mode; float = pulse-skipping; 3.2–5V = spread spectrum |
| EN/UV | Enable & input UVLO | 1.05V rising threshold; resistor divider enables programmable VIN UVLO |
| PG | Power good flag | Open-drain; asserts high when VOUT is within ±7.5% of 5V and no fault |
| TR/SS | Soft-start & tracking | Capacitor sets ramp rate; 5V output tracks 6.39× TR/SS voltage |
| GND | Power & signal ground | Exposed pad (Pin 11) must be soldered to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Rated for automotive applications (–40°C to 125°C), supporting functional safety-critical 5V rails |
| Side-wettable DFN package | Enables automated optical inspection (AOI) of solder joints - critical for automotive manufacturing traceability |
| Spread spectrum modulation | Reduces EMI peak emissions by >10dB without filter components, easing CISPR 25 Class 5 compliance |
| Low dropout capability | Maintains regulation down to ~5.2V input at full 3A load - supports cold-crank scenarios in 12V systems |
| Internal 5V feedback divider | Eliminates external resistors and associated tolerance/temperature drift - improves long-term output stability |
Applications
| Automotive Infotainment Power | Industrial Sensor Hub Supply |
|---|---|
Use Scenario: Powering display controllers, audio codecs, and USB peripherals in head units with wide battery voltage range (6–16V) and strict EMI limits. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering clean, regulated power with burst-mode IQ <2.5µA during display-off states. Use Value: Enables 10-year battery-backed memory retention and meets CISPR 25 radiated emissions requirements without added ferrites or shielding. | Use Scenario: Providing stable 5V rail for multi-sensor nodes (temperature, pressure, vibration) in factory automation PLCs operating from 24V DC bus. IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC/DC stage converting 24V to 5V for mixed-signal sensor interface ICs and microcontrollers. Use Value: Side-wettable DFN ensures reliable thermal management at 70°C ambient; 42V input withstands 40V transients per ISO 7637-2 Pulse 1/2a. |
| ADAS Camera Module Rail | Telematics Control Unit (TCU) Core Supply |
Use Scenario: Generating 5V for image signal processors (ISPs) and MIPI interfaces in rear-view and surround-view cameras exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Fixed-output buck regulator with fast transient response (<10µs) to handle ISP burst loads during frame capture. Use Value: 45ns min-on-time sustains regulation during 42V cold-crank dips; PG flag synchronizes camera boot sequence with system controller. | Use Scenario: Supplying 5V to cellular modems, GNSS receivers, and CAN controllers in vehicle-to-cloud communication modules with always-on connectivity. IC Role / Device Role / Timing Role: Low-IQ step-down regulator maintaining 5V under sleep mode (100µA load) and scaling to 3A during firmware updates or data bursts. Use Value: 2.5µA quiescent current extends battery backup runtime beyond 30 days; SYNC pin enables EMI tuning during OTA transmission windows. |
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#TRPBF | Same IC die, but in 10-lead MSOP package (no side-wettable flanks); θJA = 40°C/W | Lacks AOI-compatible solder joints; less suitable for automotive production lines requiring IPC-A-610 Class 3 inspection | Select when board space permits larger MSOP and thermal requirements are less stringent |
| LT8609AEDDM-3.3#TRPBF | Identical package and pinout, but fixed 3.3V output; same 2.5µA IQ and AEC-Q100 rating | Not interchangeable without schematic/layout change; targets 3.3V FPGA I/O or MCU core rails instead of 5V peripherals | Choose only when system requires 3.3V - not a drop-in replacement for 5V use cases |
Compared with LT8609AEMSE#TRPBF, the LT8609AEDDM#TRPBF offers superior manufacturability for automotive assembly and marginally better thermal resistance via exposed pad soldering; versus LT8609AEDDM-3.3#TRPBF, it provides identical reliability and footprint but serves distinct voltage domains - confirming that voltage selection drives part identity, not just packaging.
Availability
LT8609AEDDM#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, industrial sensor hubs, and telematics control units requiring stable component supply across extended temperature ranges and rigorous quality audits.
Supply support for LT8609AEDDM#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive electronics markets.
The LT8609A product line delivers high-efficiency, low-EMI synchronous buck regulators optimized for automotive and industrial applications where input voltage range, quiescent current, and AEC-Q100 compliance are critical design constraints.
FAQ
What is the output voltage tolerance of the LT8609AEDDM#TRPBF over temperature and load?
The LT8609AEDDM#TRPBF delivers a fixed 5V output with ±2% total tolerance over –40°C to 125°C junction temperature and full 0–3A load range. This includes initial accuracy, line regulation (±0.004%/V), load regulation (±0.1%), and thermal drift - verified per datasheet Figure 41 and Table specifications.
Does the LT8609AEDDM#TRPBF require an external feedback resistor network?
No. The LT8609AEDDM#TRPBF integrates an internal 8.95MΩ feedback divider and regulates its VOUT pin directly to 5.0V. No external resistors are needed - simplifying layout, eliminating resistor tolerance errors, and improving long-term stability compared to adjustable variants like the LT8609AEMSE#TRPBF.
How does the SYNC pin function on the LT8609AEDDM#TRPBF?
On the LT8609AEDDM#TRPBF, the SYNC pin enables three operating modes: grounded for low-ripple Burst Mode® (IQ = 2.5µA), floating for pulse-skipping, or biased to 3.2–5.0V for spread spectrum modulation (1–6kHz frequency dithering). Unlike the LT8609B, it retains full SYNC functionality - critical for EMI-sensitive automotive designs.
Is the LT8609AEDDM#TRPBF pin-compatible with other LT8609A package variants?
Yes - the LT8609AEDDM#TRPBF shares identical pin numbering and function mapping with the LT8609AEMSE#TRPBF (MSOP) and LT8609AEMSE16#TRPBF (16-lead MSOP), though the latter has NC pins. Signal routing and PCB footprint differ due to package geometry, but schematic symbols and net assignments remain consistent across all LT8609A variants.
What thermal derating applies to the LT8609AEDDM#TRPBF at 125°C ambient?
At 125°C ambient with standard 2-layer PCB (2oz copper, 1in² exposed pad), the LT8609AEDDM#TRPBF's maximum continuous output current derates to ~2.1A (per thermal simulation and Figure 31). Full 3A operation is guaranteed up to 105°C ambient; above that, current must be reduced linearly to maintain TJ ≤ 150°C.
LT8609AEDDM#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN 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, Wettable Flank
- Supplier Device Package:
- 10-DFN (3x3)
LT8609AEDDM#TRPBF FAQ
1.How can I place an order for LT8609AEDDM#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AEDDM#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 LT8609AEDDM#TRPBF reliable?
The price and inventory of LT8609AEDDM#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AEDDM#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8609AEDDM#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AEDDM#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AEDDM#TRPBF?
LT8609AEDDM#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AEDDM#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 LT8609AEDDM#TRPBF?
For technical support, including LT8609AEDDM#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AEDDM#TRPBF requirements.
6.How does Aetrix verify that LT8609AEDDM#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8609AEDDM#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 LT8609AEDDM#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8609AEDDM#TRPBF?
All LT8609AEDDM#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AEDDM#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 LT8609AEDDM#TRPBF part is unused and in its original packaging.
Return procedure for LT8609AEDDM#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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