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Analog Devices Inc. LT8609AJDDM-3.3#TRPBF
- Part No.:
- LT8609AJDDM-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8609AJDDM-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 3A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,855
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Product details
Overview
LT8609AJDDM-3.3#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®, fixed 3.3V output, ±7.5% power-good accuracy, and operation up to 150°C junction temperature. It delivers high efficiency (>93% at 1A, 12VIN→3.3VOUT) for automotive infotainment power rails.
For engineers reviewing the LT8609AJDDM-3.3#TRPBF datasheet, LT8609AJDDM-3.3#TRPBF pinout, LT8609AJDDM-3.3#TRPBF application, or LT8609AJDDM-3.3#TRPBF equivalent, key selection criteria include ultralow IQ under light load, AEC-Q100 qualification, fixed-output accuracy, thermal robustness to 150°C, and spread-spectrum EMI reduction capability.
Technical Context
The LT8609AJDDM-3.3#TRPBF implements peak current mode control with internal compensation, enabling fast transient response and stable operation with small inductors (e.g., 2.2µH). Its 45ns minimum on-time supports high VIN/VOUT ratios and low-duty-cycle regulation down to 3.3V from 42V input.
Burst Mode® operation maintains <10mVP-P output ripple while achieving 2.5µA IQ at no load; the SYNC pin enables external clock synchronization or spread-spectrum modulation to suppress EMI peaks, and the EN/UV pin provides accurate 1.05V enable threshold with 50mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% over full temperature range (–40°C to 150°C) |
| Max Continuous Output Current | 3A - supports high-current automotive subsystems without external current boosting |
| Input Voltage Range | 3.0V to 42V - accommodates cold-crank (4.5V) and load-dump (40V) transients in automotive systems |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT in Burst Mode® - enables always-on functionality with minimal battery drain |
| Switching Frequency | Adjustable 200kHz to 2.2MHz via RT resistor - allows optimization for size (high-freq) or efficiency (low-freq) |
| Power-Good Accuracy | ±7.5% on VOUT - ensures reliable system sequencing and fault detection for downstream logic |
| Thermal Rating | Junction temperature range –40°C to 150°C - qualified for under-hood automotive applications |
Pinout & Package
LT8609AJDDM-3.3#TRPBF uses a 10-lead (3mm × 3mm) plastic side-wettable DFN package with exposed thermal pad (Pin 11 = GND), θJA = 45°C/W, θJC = 10°C/W. The exposed pad must be soldered to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 3.0V–42V; requires local ceramic bypass capacitor (≥1µF) placed adjacent to pin |
| BST | Bootstrap supply for high-side FET gate drive | Requires 0.1µF ceramic capacitor between BST and SW; no series resistor allowed |
| SW | Switch node | Connects to inductor and BST capacitor; must be minimized in layout to reduce EMI and switching losses |
| INTVCC | Internal 3.5V regulator output | Bypass with ≥1µF low-ESR ceramic; not for external loading |
| RT | Frequency setting | Resistor to GND sets fSW (200kHz–2.2MHz); open = 2MHz default |
| SYNC | External sync/spread-spectrum control | GND = Burst Mode®; float = pulse-skipping; 3.2V–5V = spread-spectrum EMI reduction |
| EN/UV | Enable and input undervoltage lockout | 1.05V rising threshold with 50mV hysteresis; enables VIN UVLO programming via resistor divider |
| PG | Power-good open-drain flag | Asserts high when VOUT is within ±7.5%; valid above 3.2V VIN regardless of EN/UV state |
| TR/SS | Soft-start and tracking control | Capacitor here programs output ramp rate; internal 2µA pull-up enables simple soft-start timing |
| VOUT | Regulated 3.3V output | Fixed output pin with internal 5.9MΩ feedback divider; connects directly to load and output capacitor |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use across –40°C to +150°C junction temperature |
| Side-wettable DFN package | Enables automated optical inspection (AOI) of solder joints on production PCBs |
| Spread-spectrum frequency modulation | Reduces peak EMI by >10dB without requiring external filters or shielding |
| Internal compensation | Eliminates need for external compensation network - simplifies design and saves board space |
| Low dropout operation | Maintains regulation with <300mV dropout at 3A - critical for low-VIN battery backup scenarios |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powering SoC, DSP, and display interfaces in head units and digital clusters. IC Role / Device Role / Timing Role: Primary 3.3V buck converter delivering clean, sequenced power with PG signaling. Use Value: 2.5µA quiescent current extends battery life during vehicle sleep mode; ±7.5% PG accuracy ensures safe boot sequencing. | Use Scenario: Supplying image sensor, ISP, and serializer in rear-view or surround-view cameras. IC Role / Device Role / Timing Role: Fixed-output 3.3V regulator with fast transient response to handle burst-mode sensor readouts. Use Value: 45ns min on-time supports stable 3.3V output from 12V battery even during cold-crank dips; side-wettable DFN aids high-reliability automotive assembly. |
| Industrial IoT Edge Node | Telematics Control Unit (TCU) |
Use Scenario: Powering wireless MCU, RF transceiver, and sensor interface in battery-operated gateways. IC Role / Device Role / Timing Role: Always-on 3.3V supply with ultra-low IQ and robust input transient handling. Use Value: 42V input rating withstands industrial 24V rail surges; Burst Mode® maintains <10mVP-P ripple without compromising standby efficiency. | Use Scenario: Regulating 3.3V for cellular modem, GNSS receiver, and CAN controller in vehicle telematics modules. IC Role / Device Role / Timing Role: AEC-Q100-compliant primary buck stage with spread-spectrum EMI control for EMC compliance. Use Value: SYNC-enabled spread spectrum meets CISPR 25 Class 5 radiated emissions limits; 150°C rating supports placement near heat-generating processors. |
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#TRPBF | Same architecture and pinout, but rated for –40°C to 125°C junction temperature | Suitable for cabin electronics (e.g., center stack), not under-hood environments | Select when ambient temperature stays below 125°C and cost sensitivity outweighs extended thermal margin |
| LT8609AJMSE#TRPBF | 10-lead MSOP package (not DFN); identical electrical specs and 150°C rating | Preferred where legacy MSOP footprint exists or manual rework is required | Choose for compatibility with existing MSOP-based layouts or where side-wettable DFN AOI is unavailable |
Compared with LT8609AEDDM-3.3#TRPBF, the LT8609AJDDM-3.3#TRPBF adds 25°C higher thermal margin for under-hood deployment; versus LT8609AJMSE#TRPBF, it offers smaller footprint and superior thermal resistance (θJA 45°C/W vs 40°C/W) despite identical rating.
Availability
LT8609AJDDM-3.3#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, industrial IoT edge nodes, and telematics control units requiring stable component supply across extended temperature ranges.
Supply support for LT8609AJDDM-3.3#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 LT8609 family is designed for high-efficiency, low-EMI, wide-input DC/DC conversion in space-constrained and thermally demanding applications - especially automotive and industrial systems requiring ultralow quiescent current and AEC-Q100 compliance.
FAQ
What is the guaranteed operating junction temperature range for LT8609AJDDM-3.3#TRPBF?
The LT8609AJDDM-3.3#TRPBF is guaranteed over the full –40°C to +150°C junction temperature range per its J-grade qualification. This is confirmed in the Absolute Maximum Ratings table and Order Information section, where "LT8609AJDDM-3.3#TRPBF" explicitly lists "–40°C to 150°C" under Temperature Range. It is AEC-Q100 qualified for automotive under-hood use.
Does LT8609AJDDM-3.3#TRPBF require an external feedback resistor divider?
No, LT8609AJDDM-3.3#TRPBF does not require an external feedback resistor divider. As a fixed-output variant, it integrates a 5.9MΩ internal resistor network referenced to the VOUT pin, regulating precisely to 3.3V. The datasheet states: "The LT8609A-3.3 regulates to VOUT pin to 3.3V. This pin connects a 5.9MΩ internal feedback divider that programs the fixed output."
How is EMI reduced in LT8609AJDDM-3.3#TRPBF?
LT8609AJDDM-3.3#TRPBF reduces EMI via optional spread-spectrum frequency modulation enabled by applying 3.2V–5.0V to the SYNC pin. This dithers the switching frequency by ±10% at 1–6kHz, lowering peak radiated emissions by >10dB. The LT8609A variant also features slower switch edges than the base LT8609, further suppressing high-frequency harmonics.
What is the power-good (PG) accuracy specification for LT8609AJDDM-3.3#TRPBF?
The power-good (PG) flag on LT8609AJDDM-3.3#TRPBF asserts high when the VOUT pin voltage is within ±7.5% of the nominal 3.3V output. This is specified in the Electrical Characteristics table under "PG Upper Threshold Offset from VOUT" and "PG Lower Threshold Offset from VOUT", both listed as ±7.5% for fixed-output variants like LT8609AJDDM-3.3#TRPBF.
Can LT8609AJDDM-3.3#TRPBF operate without connecting the SYNC pin?
Yes, LT8609AJDDM-3.3#TRPBF can operate with the SYNC pin left floating, which configures it into pulse-skipping mode without spread-spectrum modulation. In this mode, quiescent current increases to several mA (vs 2.5µA in Burst Mode®), but light-load efficiency remains high. The datasheet confirms: "Leave floating for pulse-skipping mode with no spread spectrum modulation."
LT8609AJDDM-3.3#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:
- 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#TRPBF FAQ
1.How can I place an order for LT8609AJDDM-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AJDDM-3.3#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 LT8609AJDDM-3.3#TRPBF reliable?
The price and inventory of LT8609AJDDM-3.3#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8609AJDDM-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AJDDM-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AJDDM-3.3#TRPBF?
LT8609AJDDM-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AJDDM-3.3#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 LT8609AJDDM-3.3#TRPBF?
For technical support, including LT8609AJDDM-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AJDDM-3.3#TRPBF requirements.
6.How does Aetrix verify that LT8609AJDDM-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8609AJDDM-3.3#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 LT8609AJDDM-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8609AJDDM-3.3#TRPBF?
All LT8609AJDDM-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AJDDM-3.3#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 LT8609AJDDM-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LT8609AJDDM-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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