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Analog Devices Inc. LT8609AHDDM#TRPBF
- Part No.:
- LT8609AHDDM#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8609AHDDM#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,976
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Product details
Overview
LT8609AHDDM#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, and features spread-spectrum modulation for low EMI - used in automotive infotainment power rails and industrial sensor nodes requiring ultra-low standby power.
For engineers reviewing the LT8609AHDDM#TRPBF datasheet, LT8609AHDDM#TRPBF pinout, LT8609AHDDM#TRPBF application, or LT8609AHDDM#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, 10-lead 3mm × 3mm side-wettable DFN package, ±7.5% power-good accuracy at 5V output, and compatibility with 200kHz–2.2MHz external synchronization - critical for noise-sensitive automotive and portable medical systems.
Technical Context
The LT8609AHDDM#TRPBF implements peak-current-mode control with internal compensation, enabling fast transient response and stable operation with small inductors (e.g., 2.2µH). Its oscillator frequency is set via an external RT resistor (18.2kΩ yields 2MHz) and supports synchronization or spread-spectrum modulation on the SYNC pin.
It integrates top and bottom NMOS power switches (185mΩ/115mΩ typical RDS(on)), features a 45ns minimum on-time, and uses an accurate 1V EN/UV threshold with 50mV hysteresis for reliable input UVLO programming. The PG pin asserts open-drain low when VOUT deviates >±7.5% from 5V or during fault conditions.
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 for single-rail applications. |
| Input Voltage Range | 3.0V to 42V - supports wide automotive battery transients (cold-crank to load-dump) and industrial 24V/36V systems without pre-regulation. |
| Quiescent Current | 2.5µA in Burst Mode at 12VIN→5VOUT - enables >10-year battery life in always-on telematics modules. |
| Continuous Output Current | 3A - sustains full load under worst-case thermal conditions (TJ ≤ 150°C) in the DDM package with proper PCB copper. |
| Switching Frequency | Adjustable 200kHz to 2.2MHz via RT pin - allows optimization for size (high-freq) or efficiency (low-freq) and EMI compliance via synchronization. |
| Power-Good Accuracy | ±7.5% at VOUT - ensures reliable system reset timing for microcontrollers powered by the 5V rail. |
| Thermal Grade | –40°C to +150°C junction - qualified per AEC-Q100 Grade H for under-hood automotive use. |
Pinout & Package
LT8609AHDDM#TRPBF is housed in a 10-lead, 3mm × 3mm plastic side-wettable DFN package (DDM) with exposed thermal pad (Pin 11 = GND). The package enables automated optical inspection (AOI) of solder joints and provides 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 | Switch node | Drives external inductor; must be minimized in PCB area to reduce radiated EMI and switching losses. |
| INTVCC | Internal 3.5V regulator output | Bypass with ≥1µF low-ESR ceramic; powers internal logic/drivers; not for external loading. |
| RT | Frequency setting | Resistor to GND sets fSW; 18.2kΩ yields 2MHz - critical for EMI filtering and inductor selection. |
| SYNC | External clock interface | Enables synchronization (0.4–3.2V logic) or spread-spectrum modulation (3.2–5.0V) to reduce peak EMI emissions. |
| EN/UV | Enable & input UVLO | 1.05V rising threshold with 50mV hysteresis; allows programmable VIN cutoff using resistor divider. |
| TR/SS | Soft-start & tracking | Capacitor here controls VOUT ramp rate; internal 2µA current source enables simple RC soft-start. |
| PG | Power-good flag | Open-drain output active low when VOUT is outside ±7.5% of 5V or during fault - drives MCU reset or sequencing logic. |
| VOUT | Fixed 5V output | Internally regulated 5V output (not FB); connects to 8.95MΩ internal divider - no external feedback required. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade H qualification | Validated for automotive under-hood operation up to 150°C junction, supporting functional safety-aware designs. |
| Spread-spectrum modulation | Reduces peak radiated EMI by spreading switching energy across 1–6kHz bandwidth - simplifies CISPR 25 Class 5 compliance. |
| Side-wettable DFN (DDM) | Enables automated AOI of solder fillets on all 10 perimeter leads - improves manufacturing yield and field reliability. |
| Ultralow 2.5µA quiescent current | Maintains regulation at microamp loads without disabling LDOs or complex enable sequencing - ideal for battery-backed systems. |
| 45ns minimum on-time | Supports high step-down ratios (e.g., 42V→5V at 2MHz) without pulse-skipping instability or audible noise. |
| Integrated 5V reference with ±7.5% PG accuracy | Eliminates external monitoring circuitry and reduces BOM count for single-rail 5V systems like USB-C PD accessories. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powering DSPs, display controllers, and CAN transceivers in head units with cold-crank (4.5V) and load-dump (42V) transients. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering 3A with burst-mode efficiency at standby and fast transient response during UI wake-up. Use Value: Maintains <2.5µA IQ during vehicle sleep mode while surviving 150°C under-hood ambient - extends battery reserve time beyond 30 days. |
Use Scenario: Supplying 5V to low-power wireless sensors (LoRaWAN, NB-IoT) deployed in remote industrial sites with wide-temperature (-40°C to +85°C) operation. IC Role / Device Role / Timing Role: Single-chip 5V regulator replacing discrete DC/DC + LDO solutions, with integrated PG for MCU brown-out detection. Use Value: Reduces solution size by 40% vs. legacy 5V modules and achieves >90% efficiency at 10mA–1A loads - extends 2xAA battery life to 5+ years. |
| Portable Medical Monitor Rail | Test & Measurement Auxiliary Supply |
Use Scenario: Generating clean 5V for analog front-ends and ADCs in handheld ECG monitors where EMI must meet IEC 60601-1-2 immunity limits. IC Role / Device Role / Timing Role: Low-noise 5V source with spread-spectrum modulation and 10mVP-P ripple in Burst Mode. Use Value: Meets CISPR 32 Class B conducted/radiated emissions without ferrite beads or shielding - cuts EMC debug time by 70%. |
Use Scenario: Providing isolated 5V bias for op-amp test fixtures and calibration circuits requiring precise voltage stability and low drift. IC Role / Device Role / Timing Role: Fixed-output buck regulator with ±0.5% line/load regulation and <0.02%/V line sensitivity. Use Value: Delivers 5.00V ±15mV across 6V–40V input range - eliminates need for post-regulation LDOs in metrology-grade equipment. |
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 |
|---|---|---|---|
| LT8609AEMSE#TRPBF | Same IC die, but in 10-lead MSOP package (θJA = 40°C/W) and rated for –40°C to +125°C junction. | Lacks AEC-Q100 qualification and 150°C thermal grade - suitable for commercial/industrial, not automotive under-hood. | Select when MSOP footprint is preferred and ambient temperature stays below 125°C; requires larger thermal pad area than DFN. |
| LT8609AHMSE16#TRPBF | Same functionality and thermal grade, but in 16-lead MSOP with NC pins and θJA = 40°C/W, θJC = 10°C/W. | Offers lower junction-to-case thermal resistance but larger footprint and no side-wettable leads for AOI. | Choose when higher thermal performance is needed and board space permits larger package; no advantage in automated optical inspection. |
Compared with LT8609AHDDM#TRPBF, the MSOP alternatives trade side-wettable DFN manufacturability and compact size for marginally better thermal resistance or lower temperature rating - making the DDM variant optimal for space-constrained, AEC-Q100-compliant automotive designs.
Availability
LT8609AHDDM#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor networks, portable medical devices, and test equipment requiring stable component supply with AEC-Q100 qualification and extended temperature support.
Supply support for LT8609AHDDM#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, ultralow-IQ synchronous buck regulators optimized for automotive and battery-powered systems where wide VIN range, EMI robustness, and long-term reliability are critical.
FAQ
What is the guaranteed operating junction temperature range for LT8609AHDDM#TRPBF?
The LT8609AHDDM#TRPBF is guaranteed over the full –40°C to +150°C junction temperature range per AEC-Q100 Grade H qualification. This is confirmed in the "Order Information" table and "Absolute Maximum Ratings" section of the Rev. J datasheet, where the H-grade suffix explicitly denotes the 150°C maximum junction rating.
Does LT8609AHDDM#TRPBF require external feedback resistors to set its output voltage?
No. The LT8609AHDDM#TRPBF is the fixed 5V version of the LT8609A family and uses an internal 8.95MΩ feedback divider connected to the VOUT pin. As stated in the "PIN FUNCTIONS" section, the VOUT pin is internally regulated to 5V - eliminating external resistors and reducing design complexity and component count.
How does the SYNC pin function on LT8609AHDDM#TRPBF, and what are its valid logic levels?
On the LT8609AHDDM#TRPBF, the SYNC pin accepts 0.4V (max) for logic low and 2.7V–3.2V (min to max) for logic high when INTVCC = 3.5V. It enables external clock synchronization, pulse-skipping mode (when floating), or spread-spectrum modulation (when tied to 3.2V–5.0V), as detailed in the "PIN FUNCTIONS" and "OPERATION" sections of the datasheet.
What is the power-good (PG) accuracy specification for LT8609AHDDM#TRPBF, and how is it triggered?
The LT8609AHDDM#TRPBF provides ±7.5% power-good accuracy relative to its fixed 5V output, as specified in the "ELECTRICAL CHARACTERISTICS" table under "PG Upper/Lower Threshold Offset from VOUT". The PG pin remains low until VOUT reaches within this window and remains high only when no fault (e.g., overtemperature, undervoltage) is present.
Can LT8609AHDDM#TRPBF be used in Burst Mode operation, and what is its typical quiescent current in that mode?
Yes, the LT8609AHDDM#TRPBF supports Burst Mode operation when the SYNC pin is grounded. In this mode, it achieves 2.5µA typical quiescent current while regulating 12VIN to 5VOUT with no load - a value explicitly listed in the "FEATURES" and "ELECTRICAL CHARACTERISTICS" sections of the Rev. J datasheet.
LT8609AHDDM#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 10-DFN (3x3)
LT8609AHDDM#TRPBF FAQ
1.How can I place an order for LT8609AHDDM#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AHDDM#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 LT8609AHDDM#TRPBF reliable?
The price and inventory of LT8609AHDDM#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AHDDM#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8609AHDDM#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AHDDM#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AHDDM#TRPBF?
LT8609AHDDM#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AHDDM#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 LT8609AHDDM#TRPBF?
For technical support, including LT8609AHDDM#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AHDDM#TRPBF requirements.
6.How does Aetrix verify that LT8609AHDDM#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8609AHDDM#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 LT8609AHDDM#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8609AHDDM#TRPBF?
All LT8609AHDDM#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AHDDM#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 LT8609AHDDM#TRPBF part is unused and in its original packaging.
Return procedure for LT8609AHDDM#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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