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Analog Devices Inc. LT8609AJDDM-5#PBF
- Part No.:
- LT8609AJDDM-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8609AJDDM-5#PBF.pdf
- Description:
- IC REG BUCK 5V 3A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:306
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Product details
Overview
LT8609AJDDM-5#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®, fixed 5V output, ±7.5% power-good accuracy, and operation up to 150°C junction temperature for automotive-grade reliability.
For engineers reviewing the LT8609AJDDM-5#PBF datasheet, LT8609AJDDM-5#PBF pinout, LT8609AJDDM-5#PBF application, or LT8609AJDDM-5#PBF equivalent, this page delivers verified technical context, real-world design values, validated alternatives, and supply-chain support tailored for high-reliability embedded power systems.
Technical Context
The LT8609AJDDM-5#PBF implements peak current mode control with internal compensation, enabling fast transient response and stable loop behavior using small external inductors (e.g., 2.2µH). Its fixed 5V output eliminates external feedback resistors and integrates an internal 8.95MΩ divider referenced to the VOUT pin.
Burst Mode® operation maintains <10mVP-P output ripple at light loads while drawing only 46µA input current at 100µA load (VIN = 12V), and its SYNC pin supports external clock synchronization or spread-spectrum modulation to reduce EMI-though the LT8609B variant lacks this pin, the LT8609AJDDM-5#PBF retains full SYNC functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.00V ±2% over temperature and line; eliminates need for external feedback network. |
| Max Continuous Output Current | 3A; supported by low RDS(on) top/bottom MOSFETs (185mΩ / 115mΩ) and thermal design with θJA = 45°C/W. |
| Quiescent Current (Burst Mode) | 46µA at 100µA load (VIN = 12V); enables >90% efficiency down to µA-level loads in always-on systems. |
| Input Voltage Range | 3.0V to 42V; supports wide automotive battery transients including cold-crank (4.5V) and load-dump (40V). |
| Power-Good Accuracy | ±7.5% on VOUT; PG asserts when output reaches 4.625V–5.375V, enabling precise system sequencing. |
| Switching Frequency Range | 200kHz to 2.2MHz via RT resistor; 2MHz operation allows compact 2.2µH inductor and reduces solution footprint. |
| Minimum On-Time | 45ns; enables high step-down ratios (e.g., 42V→5V at 2MHz) without pulse-skipping instability. |
Pinout & Package
LT8609AJDDM-5#PBF uses a 10-lead 3mm × 3mm plastic side-wettable DFN package (DDM) with exposed thermal pad (Pin 11 = GND), optimized for automated optical inspection (AOI) and high-reliability solder joint formation in automotive PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Primary input power supply | Accepts 3.0V–42V; requires local 1µF ceramic bypass to GND for stability and EMI reduction. |
| BST | Bootstrap supply for high-side gate driver | Connect 0.1µF capacitor between BST and SW; no series resistor allowed per layout guidelines. |
| 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 to GND; not for external loading-internal drivers only. |
| RT | Frequency setting resistor connection | Grounded resistor sets fSW: 18.2kΩ → 2MHz; critical for optimizing efficiency vs. size trade-off. |
| SYNC | External clock/synchronization input | Enables EMI reduction via spread spectrum (3–6kHz modulation) or precise frequency locking. |
| EN/UV | Enable and input undervoltage lockout | 1.05V rising threshold; resistor divider from VIN programs custom UVLO (e.g., 6V cutoff). |
| PG | Open-drain power-good flag | Pulls low until VOUT within ±7.5% of 5V; used for microcontroller reset or downstream enable sequencing. |
| TR/SS | Soft-start and tracking control | Capacitor here sets output ramp rate; 5V output tracks TR/SS × 6.39 for controlled startup. |
| VOUT | Fixed 5V regulated output | Internally regulated node; connects to output capacitor and load; no external feedback required. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode® | 46µA at 100µA load enables >10-year battery life in always-on telematics modules. |
| Automotive AEC-Q100 Grade 1 | Qualified for –40°C to +150°C junction operation; meets stringent automotive reliability and qualification testing. |
| Side-wettable DFN (DDM) | Enables AOI-compatible solder joint inspection on bottom-side thermal pad-critical for automotive process control. |
| Integrated 5V reference with PG | Eliminates external feedback components and provides accurate ±7.5% power-good signaling for safe system boot. |
| 2MHz switching capability | Supports compact 2.2µH inductors and 47µF output capacitance, reducing total solution size by >30% vs. 500kHz designs. |
Applications
| GSM Transceiver Power | Automotive Infotainment Core Rail |
|---|---|
Use Scenario: Powering RF transceiver ICs requiring clean, low-noise 5V supply during burst transmission. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering regulated 5V with <10mVP-P ripple in Burst Mode® to minimize sleep-mode current draw. Use Value: Enables 2.5µA quiescent current during idle states while maintaining fast wake-up and tight output regulation during transmit bursts. |
Use Scenario: Supplying SoC core voltage in head-unit systems exposed to automotive battery transients (42V load dump, –40°C cold crank). IC Role / Device Role / Timing Role: High-input-voltage buck regulator with integrated PG and thermal shutdown protecting downstream processors. Use Value: Delivers 3A continuous current with AEC-Q100 Grade 1 qualification and ±7.5% PG accuracy for robust system-level power sequencing. |
| Industrial IoT Sensor Hub | ADAS Camera Module Power |
Use Scenario: Powering ultra-low-power sensor nodes with long-life primary batteries or energy harvesting sources. IC Role / Device Role / Timing Role: Efficient step-down regulator operating from wide-input industrial supplies (12–36V) into 5V logic rails. Use Value: Achieves >93% efficiency at 1A (12VIN→5VOUT) and 46µA no-load IQ, extending battery life without compromising responsiveness. |
Use Scenario: Providing stable 5V rail to image sensors and ISP processors in automotive surround-view cameras. IC Role / Device Role / Timing Role: Low-EMI synchronous buck with spread-spectrum SYNC capability to meet CISPR-25 Class 5 emission limits. Use Value: Reduces conducted/radiated noise through 2MHz operation and programmable spread-spectrum modulation-no added filtering required. |
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-5#PBF | Same architecture and pinout, but rated for –40°C to +125°C junction (vs. +150°C for LT8609AJDDM-5#PBF). | Not qualified for under-hood automotive use where ambient exceeds 105°C; suitable for cabin electronics or industrial controls. | Select when extended temperature range is unnecessary and cost optimization is prioritized. |
| LT8609AHDDM-5#PBF | Identical specs and temperature rating (–40°C to +150°C), but offered in tape-and-reel with #WPBF automotive suffix for controlled manufacturing flow. | Includes full AEC-Q100 documentation package and automotive-specific traceability; required for Tier-1 OEM sourcing. | Select when formal automotive qualification reporting and lot traceability are mandatory. |
Compared with LT8609AEDDM-5#PBF, the LT8609AJDDM-5#PBF adds guaranteed operation up to +150°C junction for under-hood deployment; compared with LT8609AHDDM-5#PBF, it shares identical electrical/thermal specs but omits the formal automotive process controls-making it ideal for high-reliability non-OEM automotive or industrial applications.
Availability
LT8609AJDDM-5#PBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial IoT sensor hubs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8609AJDDM-5#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, communications, and automotive markets.
The LT8609 family is designed for high-efficiency, ultralow-quiescent-current DC/DC conversion in space-constrained, thermally demanding environments-including automotive, industrial, and portable electronics.
FAQ
What is the guaranteed operating junction temperature range for LT8609AJDDM-5#PBF?
The LT8609AJDDM-5#PBF is fully specified and guaranteed over a junction temperature range of –40°C to +150°C. This rating is confirmed in the official Analog Devices datasheet Rev. J, and enables deployment in under-hood automotive locations where ambient temperatures exceed 105°C and thermal derating must be minimized.
Does LT8609AJDDM-5#PBF require external feedback resistors to set the 5V output?
No, the LT8609AJDDM-5#PBF does not require external feedback resistors. It integrates an internal 8.95MΩ resistor divider referenced to the VOUT pin, which fixes the regulated output precisely at 5.00V ±2%. This simplifies design, improves accuracy, and reduces BOM count versus adjustable variants like the LT8609AJDDM.
How does the SYNC pin function on LT8609AJDDM-5#PBF, and what are its valid voltage states?
The SYNC pin on LT8609AJDDM-5#PBF supports three modes: grounded for low-ripple Burst Mode® operation; floated for pulse-skipping mode; or tied to 3.2V–5.0V (e.g., INTVCC) for spread-spectrum modulation. Unlike the LT8609B, the LT8609AJDDM-5#PBF retains full SYNC functionality for EMI-sensitive applications.
What is the power-good (PG) accuracy and threshold behavior for LT8609AJDDM-5#PBF?
The LT8609AJDDM-5#PBF asserts PG high when VOUT reaches within ±7.5% of 5V (i.e., 4.625V–5.375V), and pulls PG low during faults or out-of-regulation conditions. PG remains valid whenever VIN > 3.2V-even if EN/UV is inactive-enabling reliable system sequencing independent of enable state.
Can LT8609AJDDM-5#PBF operate efficiently at 2MHz with a 2.2µH inductor?
Yes, the LT8609AJDDM-5#PBF is characterized for 2MHz operation with a 2.2µH inductor, achieving >93% efficiency at 1A (12VIN → 5VOUT) and maintaining <10mVP-P output ripple in Burst Mode®. The 45ns minimum on-time ensures stable regulation even at high input-to-output voltage ratios.
LT8609AJDDM-5#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):
- 5V
- 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-5#PBF FAQ
1.How can I place an order for LT8609AJDDM-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AJDDM-5#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-5#PBF reliable?
The price and inventory of LT8609AJDDM-5#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-5#PBF is usually 5 days.
3.What payment methods are accepted for LT8609AJDDM-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AJDDM-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AJDDM-5#PBF?
LT8609AJDDM-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AJDDM-5#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-5#PBF?
For technical support, including LT8609AJDDM-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AJDDM-5#PBF requirements.
6.How does Aetrix verify that LT8609AJDDM-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT8609AJDDM-5#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-5#PBF meets industry standards.
7.What is the process for return or replacement of LT8609AJDDM-5#PBF?
All LT8609AJDDM-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AJDDM-5#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-5#PBF part is unused and in its original packaging.
Return procedure for LT8609AJDDM-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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