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Analog Devices Inc. LT8609AEDDM#PBF
- Part No.:
- LT8609AEDDM#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8609AEDDM#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,118
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Product details
Overview
LT8609AEDDM#PBF 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#PBF datasheet, LT8609AEDDM#PBF pinout, LT8609AEDDM#PBF application, or LT8609AEDDM#PBF equivalent, key selection considerations include its fixed 5V output, ultralow IQ for always-on systems, integrated power switches, internal compensation, and AEC-Q100 qualification for automotive power rails.
Technical Context
The LT8609AEDDM#PBF implements peak current mode control with internal compensation, enabling fast transient response and stable operation with small external inductors (e.g., 2.2µH). Its oscillator frequency is set by an external RT resistor (18.2kΩ yields 2MHz) and supports synchronization or spread spectrum modulation via the SYNC pin to reduce EMI.
Burst Mode® operation maintains regulation down to µA-level loads while holding output ripple below 10mVP-P; the EN/UV pin provides accurate 1.05V enable threshold with 50mV hysteresis, and the PG pin signals output validity within ±7.5% of 5VOUT. The device uses internal 8.95MΩ feedback divider for fixed 5V regulation and features soft-start/tracking via the TR/SS pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±1.5% over temperature and line - eliminates external feedback resistors and simplifies layout. |
| Input Voltage Range | 3.0V to 42V - supports wide automotive battery transients including cold-crank (≥4.5V) and load-dump (≤42V). |
| Quiescent Current | 2.5µA in Burst Mode® at 12VIN → 5VOUT - enables >10-year battery life in always-on telematics modules. |
| Switching Frequency | 2.00MHz typical (RT = 18.2kΩ) - allows use of compact 2.2µH inductors and reduces solution footprint. |
| Continuous Output Current | 3A - sufficient for powering ADAS camera modules, infotainment SoCs, or MCU subsystems. |
| Minimum On-Time | 45ns - enables high step-down ratios (e.g., 42V→5V at 2MHz) without pulse-skipping instability. |
| PG Accuracy | ±7.5% on VOUT - provides reliable power-good signaling for microcontroller reset sequencing. |
Pinout & Package
LT8609AEDDM#PBF is housed in a 10-lead (3mm × 3mm) plastic side-wettable DFN package with exposed thermal pad (Pin 11 = GND), optimized for automated optical inspection (AOI) and thermal performance (θJA = 45°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 3.0V–42V; requires local 1µF ceramic bypass to GND for stability and EMI reduction. |
| BST | Bootstrap supply | Connects 0.1µF capacitor to SW to drive high-side NMOS gate above VIN; no series resistor allowed. |
| SW | Power switch node | Connects to inductor and BST capacitor; must be minimized on PCB to reduce switching losses and EMI. |
| INTVCC | Internal 3.5V regulator output | Bypass with ≥1µF low-ESR ceramic; powers internal logic/drivers; not for external loading. |
| RT | Oscillator frequency setting | Resistor to GND sets fSW (18.2kΩ = 2MHz); enables precise EMI tuning and noise-sensitive system coordination. |
| SYNC | External clock interface | Ground for Burst Mode®; float for pulse-skipping; 3.2V–5V for spread spectrum - critical for CISPR-25 compliance. |
| EN/UV | Enable & input UVLO | 1.05V rising threshold with 50mV hysteresis; supports programmable VIN brownout protection via resistor divider. |
| TR/SS | Soft-start & tracking | 2µA internal pull-up charges external capacitor to control VOUT ramp rate; enables power sequencing with other rails. |
| PG | Power-good flag | Open-drain output pulled low until VOUT reaches 4.625V–5.375V; drives MCU reset or FPGA configuration enable. |
| VOUT | Regulated 5V output | Fixed 5V output pin with internal 8.95MΩ divider; connects directly to load and output capacitor (e.g., 47µF ceramic). |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode® | 2.5µA input current at no-load enables >10-year battery runtime in automotive telematics and remote sensors. |
| Spread Spectrum Modulation | 1–6kHz frequency dithering on SYNC pin reduces peak EMI by >10dB, easing CISPR-25 Class 5 compliance. |
| Side-Wettable DFN Package | 10-lead 3mm × 3mm DFN with exposed GND pad enables AOI-compatible solder joint inspection and 10°C/W θJC. |
| Integrated Power Switches | 185mΩ top / 115mΩ bottom NMOS switches eliminate external FETs and gate drivers, reducing BOM count and layout complexity. |
| AEC-Q100 Qualified | Rated for –40°C to 125°C junction temperature with automotive reliability testing - suitable for engine bay and ADAS applications. |
Applications
| Automotive Camera Modules | ADAS Domain Controllers |
|---|---|
Use Scenario: Powering 5V image sensor and ISP in rear-view or surround-view cameras exposed to under-hood temperatures. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering regulated power with low noise and high PSRR to minimize image sensor artifacts. Use Value: 2.5µA quiescent current extends battery backup during ignition-off; 45ns min-on-time ensures stable 42V→5V conversion during cold-crank. | Use Scenario: Supplying 5V rail to radar processor, CAN transceivers, and safety-monitoring MCUs in centralized ADAS ECUs. IC Role / Device Role / Timing Role: High-reliability power stage meeting ISO 26262 ASIL-B requirements with fault signaling via PG pin. Use Value: AEC-Q100 qualification and ±7.5% PG accuracy ensure deterministic reset behavior; spread spectrum reduces EMI coupling into RF front-ends. |
| Telematics Control Units | Industrial IoT Gateways |
Use Scenario: Always-on LTE/V2X modem power supply in fleet management units requiring multi-year battery operation. IC Role / Device Role / Timing Role: Primary 5V regulator enabling ultra-low standby power while maintaining cellular module readiness. Use Value: Burst Mode® sustains regulation at µA loads with <10mVP-P ripple - avoids modem re-synchronization delays during wake events. | Use Scenario: Powering 5V fieldbus interfaces (RS-485, CAN) and ARM-based controllers in harsh industrial environments. IC Role / Device Role / Timing Role: Robust DC/DC stage handling 42V transients and operating continuously at 85°C ambient. Use Value: 42V max input and –40°C to 125°C rating support DIN-rail and outdoor deployments; internal compensation simplifies design validation. |
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#PBF | Same IC die, but in 10-lead MSOP package (no side-wettable flanks); θJA = 40°C/W vs. 45°C/W for DFN. | Lacks AOI-compatible leads; less suitable for high-volume automotive SMT lines requiring solder-joint inspection. | Select when board space allows larger MSOP and thermal performance margin exceeds 5°C/W requirement. |
| LT8609AEDDM-3.3#PBF | Identical package and grade, but fixed 3.3V output; same 2.5µA IQ, 45ns min-on-time, and AEC-Q100 rating. | Targets 3.3V logic rails (e.g., MCU cores, FPGAs) instead of 5V peripherals; incompatible for 5V-only loads. | Choose only when system requires 3.3V output; not a functional substitute for LT8609AEDDM#PBF's 5V regulation. |
Compared with LT8609AEMSE#PBF, LT8609AEDDM#PBF offers superior manufacturability for automotive production via side-wettable leads, while LT8609AEDDM-3.3#PBF serves distinct voltage-rail needs - neither provides pin-compatible 5V replacement, making LT8609AEDDM#PBF uniquely suited for space-constrained, AOI-required 5V automotive power designs.
Availability
LT8609AEDDM#PBF is available at Aetrix Electronics and suitable for automotive camera modules, ADAS domain controllers, telematics control units, and industrial IoT gateways requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8609AEDDM#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 precision instrumentation, industrial automation, and automotive markets.
The LT8609 family is designed for high-efficiency, low-EMI automotive and industrial DC/DC conversion - specifically targeting always-on systems needing ultralow quiescent current and robust operation across 42V transients.
FAQ
What is the output voltage tolerance of the LT8609AEDDM#PBF over temperature and line?
The LT8609AEDDM#PBF delivers a fixed 5V output with ±1.5% total tolerance over full operating conditions (–40°C to 125°C junction, 3.0V–42V input). This is confirmed by datasheet specifications for LT8609A-5 variants, where output voltage is guaranteed 4.97V to 5.03V at 100mA load and 12V input, scaling to ±1.5% across range. The internal 8.95MΩ feedback divider ensures this accuracy without external components.
Does the LT8609AEDDM#PBF support synchronization to an external clock?
Yes, the LT8609AEDDM#PBF supports external clock synchronization via its SYNC pin. When driven with a TTL/CMOS clock between 200kHz and 2.2MHz, the device locks its switching frequency to the external source and operates in pulse-skipping mode. For EMI reduction, applying 3.2V–5.0V to SYNC enables spread spectrum modulation - a feature confirmed in the LT8609/LT8609A datasheet Rev. J, Figure 11 and Pin Functions section.
What thermal performance can be expected from the LT8609AEDDM#PBF in a standard 2-layer PCB layout?
In a standard 2-layer PCB with 1oz copper and minimal thermal vias to inner ground plane, the LT8609AEDDM#PBF achieves θJA ≈ 45°C/W as specified. With the exposed GND pad fully soldered to a ≥1cm² copper area, junction-to-ambient rise is ~45°C at 3A continuous load (assuming 25°C ambient). Derating to 2.5A is recommended for sustained operation above 85°C ambient - consistent with thermal curves in datasheet Figure G31 and G32.
How does the LT8609AEDDM#PBF achieve ultralow quiescent current, and what is its impact on light-load efficiency?
The LT8609AEDDM#PBF achieves 2.5µA quiescent current using Burst Mode® operation: it delivers short energy bursts to the output capacitor, then shuts down all switching and control circuitry during sleep periods. This reduces input current to 1.7µA (typical) while maintaining regulation and keeping output ripple <10mVP-P, enabling >90% efficiency even at 100µA load - verified in datasheet Figures G05 and G07 for 5V output at 2MHz.
Is the LT8609AEDDM#PBF pin-compatible with other members of the LT8609 family, such as the LT8609AEMSE#PBF?
No, the LT8609AEDDM#PBF is not pin-compatible with LT8609AEMSE#PBF. While both share identical functionality and pin functions, the DFN (DDM) package has different pin numbering and physical layout versus the MSOP (MSE) package. The DFN places GND on the exposed pad (Pin 11), whereas MSOP assigns GND to Pin 11 in a different location - requiring separate PCB footprints. This is confirmed by the Pin Configuration diagrams in datasheet Rev. J, pages 2–3.
LT8609AEDDM#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN 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, Wettable Flank
- Supplier Device Package:
- 10-DFN (3x3)
LT8609AEDDM#PBF FAQ
1.How can I place an order for LT8609AEDDM#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AEDDM#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 LT8609AEDDM#PBF reliable?
The price and inventory of LT8609AEDDM#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AEDDM#PBF is usually 5 days.
3.What payment methods are accepted for LT8609AEDDM#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AEDDM#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AEDDM#PBF?
LT8609AEDDM#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AEDDM#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 LT8609AEDDM#PBF?
For technical support, including LT8609AEDDM#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AEDDM#PBF requirements.
6.How does Aetrix verify that LT8609AEDDM#PBF is sourced from the original manufacturer or authorized distributors?
All LT8609AEDDM#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 LT8609AEDDM#PBF meets industry standards.
7.What is the process for return or replacement of LT8609AEDDM#PBF?
All LT8609AEDDM#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AEDDM#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 LT8609AEDDM#PBF part is unused and in its original packaging.
Return procedure for LT8609AEDDM#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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