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Analog Devices Inc. LT8609AJDDM-3.3#PBF
- Part No.:
- LT8609AJDDM-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8609AJDDM-3.3#PBF.pdf
- Description:
- IC REG BUCK 3.3V 3A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:124
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Product details
Overview
LT8609AJDDM-3.3#PBF from Analog Devices is a 42V, 3A synchronous step-down regulator with fixed 3.3V output, 2.5µA quiescent current in Burst Mode, 45ns minimum on-time, and AEC-Q100 qualified for automotive applications. It operates from 3.0V to 42V input, delivers ±7.5% power-good accuracy, and uses peak current mode control with internal compensation in a 10-lead 3mm × 3mm side-wettable DFN package.
For engineers reviewing the LT8609AJDDM-3.3#PBF datasheet, LT8609AJDDM-3.3#PBF pinout, LT8609AJDDM-3.3#PBF application, or LT8609AJDDM-3.3#PBF equivalent, key selection criteria include ultralow IQ regulation at 12VIN→3.3VOUT, EMI-sensitive automotive power rails, thermal performance up to 150°C junction, and fixed-output simplicity versus adjustable FB topology.
Technical Context
The LT8609AJDDM-3.3#PBF implements peak current mode control with internal compensation, enabling fast transient response and stable operation with small inductors. Its oscillator frequency is set via external RT resistor (155kHz–2.075MHz range) and supports synchronization or spread-spectrum modulation for EMI reduction.
Burst Mode operation maintains <10mVP-P output ripple while regulating at ultralow load currents, and the EN/UV pin provides accurate 1.05V rising threshold with 50mV hysteresis for programmable input UVLO or shutdown. The PG pin signals VOUT within ±7.5% of 3.3V and fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% over temperature and line (±7.5% PG threshold) |
| Input Voltage Range | 3.0V to 42V - supports wide automotive battery transients including cold-crank |
| Quiescent Current | 2.5µA typical at 12VIN→3.3VOUT in Burst Mode - enables always-on systems |
| Continuous Output Current | 3A - sufficient for microcontroller, sensor, and CAN transceiver power rails |
| Minimum On-Time | 45ns - enables high step-down ratios (e.g., 42V→3.3V) at 2MHz switching |
| Thermal Rating | Junction temperature range –40°C to +150°C - qualified per AEC-Q100 Grade 1 |
| Switching Frequency | Adjustable 200kHz to 2.2MHz via RT pin - allows optimization of size vs. efficiency |
Pinout & Package
LT8609AJDDM-3.3#PBF is housed in a 10-lead 3mm × 3mm plastic side-wettable DFN package (DDM) with exposed GND pad (Pin 11) requiring PCB soldering for thermal and electrical integrity. θJA = 45°C/W, θJC = 10°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Supplies internal circuitry and top switch; requires local 1µF ceramic bypass |
| 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 |
| INTVCC | Internal 3.5V regulator output | Bypass with ≥1µF low-ESR ceramic; not for external loading |
| RT | Oscillator frequency set | Resistor to GND sets fSW from 200kHz to 2.2MHz |
| SYNC | External clock interface | Enables sync, spread-spectrum, or pulse-skipping modes; floating = default pulse-skip |
| EN/UV | Enable & input UVLO | 1.05V rising threshold; resistor divider programs VIN UVLO point |
| PG | Power-good flag | Open-drain; asserts high when VOUT is within ±7.5% of 3.3V and no faults |
| TR/SS | Soft-start & tracking | Capacitor here controls VOUT ramp rate; 3.3V output tracks TR/SS × 4.2 |
| VOUT | Fixed 3.3V regulated output | Internal 5.9MΩ feedback divider; connects to output capacitor and load |
| GND | Power & signal ground | Exposed pad (Pin 11); must be soldered to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 2.5µA input current at no-load 12VIN→3.3VOUT enables >10-year battery life in always-on automotive modules |
| AEC-Q100 Grade 1 Qualification | Validated for –40°C to +150°C junction operation - suitable for under-hood and ADAS power supplies |
| 45ns Minimum On-Time | Supports direct 42V→3.3V conversion at 2MHz without external divider or pre-regulator |
| Spread Spectrum Modulation | Reduces peak EMI by >10dB across 1–6kHz band when SYNC tied to 3.3V–5V |
| Integrated Power Good | PG pin confirms VOUT stability within ±7.5% and flags overcurrent/thermal faults - eliminates external monitoring IC |
Applications
| Automotive Body Control Module | ADAS Camera Power Supply |
|---|---|
Use Scenario: Powering microcontrollers, LIN transceivers, and sensors in door modules and lighting controllers. IC Role / Device Role / Timing Role: Primary 3.3V system rail regulator with ultralow IQ for sleep-mode retention. Use Value: Enables <2.5µA system standby current, meeting OEM requirements for 10+ year battery drain limits. | Use Scenario: Providing clean, low-noise 3.3V power to image sensors and ISP processors in forward-facing cameras. IC Role / Device Role / Timing Role: Fixed-output buck converter with spread-spectrum EMI control and fast transient response. Use Value: Meets CISPR-25 Class 5 radiated emissions limits without shielding, reducing BOM cost and board area. |
| Industrial Telematics Gateway | Heavy-Duty Vehicle Telematics |
Use Scenario: Regulating 3.3V for cellular modems, GNSS receivers, and secure boot MCUs in fleet management units. IC Role / Device Role / Timing Role: High-input-voltage buck with robust thermal design and PG monitoring for firmware validation. Use Value: Sustains 3A continuous output at +125°C ambient using side-wettable DFN package, eliminating derating concerns. | Use Scenario: Powering telematics ECUs in trucks and construction equipment subject to 42V load-dump transients. IC Role / Device Role / Timing Role: Input-tolerant 42V buck with integrated UVLO hysteresis and thermal shutdown. Use Value: Survives ISO 7637-2 Pulse 5a (42V/100ms) without external TVS, simplifying front-end protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609AEDDM-3.3#PBF | Same architecture and pinout; rated for –40°C to +125°C junction (vs. +150°C) | Not qualified for under-hood locations exceeding 125°C ambient | Select when full AEC-Q100 Grade 1 thermal range is unnecessary and cost optimization is prioritized |
| LT8609AJMSE#PBF | Same J-grade rating but in 10-lead MSOP package; lacks side-wettable flanks | Higher θJA (40°C/W vs. 45°C/W) and no IPC-compliant solder joint inspection capability | Select only if legacy MSOP layout exists and automated optical inspection of solder joints is not required |
Compared with LT8609AEDDM-3.3#PBF and LT8609AJMSE#PBF, the LT8609AJDDM-3.3#PBF uniquely combines AEC-Q100 Grade 1 qualification, side-wettable DFN for process traceability, and optimized thermal resistance for high-ambient automotive deployments - making it the preferred choice where reliability and manufacturability are critical.
Availability
LT8609AJDDM-3.3#PBF is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera modules, and industrial telematics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8609AJDDM-3.3#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 automotive, industrial, communications, and healthcare markets.
The LT8609 family is designed for high-efficiency, ultralow-quiescent-current DC/DC conversion in space-constrained, thermally demanding applications - especially automotive subsystems requiring AEC-Q100 compliance and robust transient handling.
FAQ
What is the guaranteed operating junction temperature range for LT8609AJDDM-3.3#PBF?
The LT8609AJDDM-3.3#PBF is guaranteed over the full –40°C to +150°C junction temperature range per AEC-Q100 Grade 1 qualification. This is confirmed in the Order Information table and Note 2 of the datasheet, distinguishing it from E/I-grade variants limited to 125°C.
Does LT8609AJDDM-3.3#PBF require an external feedback resistor network?
No. The LT8609AJDDM-3.3#PBF integrates a precision 5.9MΩ internal feedback divider to regulate its fixed 3.3V output. The VOUT pin connects directly to the output capacitor and load - no external resistors are needed, simplifying layout and improving accuracy versus adjustable FB configurations.
How does the PG pin behave on LT8609AJDDM-3.3#PBF during startup and fault conditions?
On the LT8609AJDDM-3.3#PBF, the PG pin remains low until VOUT reaches within ±7.5% of 3.3V and stays high thereafter unless a fault (overcurrent, thermal shutdown, or VIN dropout) occurs. PG is valid when VIN > 3.2V, independent of EN/UV state - enabling reliable power sequencing in automotive systems.
Can LT8609AJDDM-3.3#PBF synchronize to an external clock, and what are the voltage requirements?
Yes. The SYNC pin on LT8609AJDDM-3.3#PBF accepts external clocks from 200kHz to 2.2MHz. For synchronization, apply a logic-high signal between 2.7V and 3.2V (with INTVCC = 3.5V). Tying SYNC to 3.3V–5.0V enables spread-spectrum modulation, while floating selects pulse-skipping mode.
What is the minimum input voltage required for LT8609AJDDM-3.3#PBF to maintain regulation?
The LT8609AJDDM-3.3#PBF maintains regulation down to a minimum input voltage of 3.0V (typical), as specified in the Electrical Characteristics table. Below this, dropout behavior begins - but the device remains functional with reduced headroom, supporting cold-crank scenarios where battery voltage dips transiently to ~3.2V.
LT8609AJDDM-3.3#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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)
LT8609AJDDM-3.3#PBF FAQ
1.How can I place an order for LT8609AJDDM-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AJDDM-3.3#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 LT8609AJDDM-3.3#PBF reliable?
The price and inventory of LT8609AJDDM-3.3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AJDDM-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LT8609AJDDM-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AJDDM-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AJDDM-3.3#PBF?
LT8609AJDDM-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AJDDM-3.3#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 LT8609AJDDM-3.3#PBF?
For technical support, including LT8609AJDDM-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AJDDM-3.3#PBF requirements.
6.How does Aetrix verify that LT8609AJDDM-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LT8609AJDDM-3.3#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 LT8609AJDDM-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LT8609AJDDM-3.3#PBF?
All LT8609AJDDM-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AJDDM-3.3#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 LT8609AJDDM-3.3#PBF part is unused and in its original packaging.
Return procedure for LT8609AJDDM-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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