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Analog Devices Inc. LT8609AJDDM#TRPBF
- Part No.:
- LT8609AJDDM#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8609AJDDM#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:932
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Product details
Overview
LT8609AJDDM#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®, 45ns minimum on-time, and AEC-Q100 qualification for automotive applications. It delivers regulated 3.3V or 5V output (configurable via internal feedback) with ±7.5% power-good accuracy and supports synchronization up to 2.2MHz.
For engineers reviewing the LT8609AJDDM#TRPBF datasheet, LT8609AJDDM#TRPBF pinout, LT8609AJDDM#TRPBF application, or LT8609AJDDM#TRPBF equivalent, key selection criteria include ultralow IQ at light loads, spread-spectrum EMI reduction capability, fast transient response enabled by peak current mode control, and thermal reliability across –40°C to 150°C junction temperature.
Technical Context
The LT8609AJDDM#TRPBF implements peak current mode control with internal compensation, enabling stable operation with small inductors and fast load-step response. Its oscillator frequency is resistor-programmable from 200kHz to 2.2MHz via the RT pin, and it supports external synchronization or spread-spectrum modulation via the SYNC pin for EMI reduction.
Burst Mode® operation maintains <10mVP-P output ripple while drawing only 2.5µA from VIN at no load (12VIN → 3.3VOUT). The EN/UV pin provides accurate 1.05V rising threshold with 50mV hysteresis for programmable input UVLO or shutdown, and the PG pin signals output regulation status with ±7.5% tolerance on fixed-output variants like this J-grade DFN part.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports wide automotive battery transients and industrial rails without pre-regulation. |
| Quiescent Current | 2.5µA at no load (12VIN→3.3VOUT) - enables always-on systems with multi-year battery life. |
| Output Current | 3A continuous - sufficient for powering microcontrollers, sensors, and communication ICs in compact designs. |
| Switching Frequency | 200kHz to 2.2MHz (RT-programmable) - allows optimization of size vs. efficiency; 2MHz enables use of sub-3mm inductors. |
| Min On-Time | 45ns - supports high step-down ratios (e.g., 42V→3.3V) at 2MHz without pulse-skipping instability. |
| Power-Good Accuracy | ±7.5% on VOUT - ensures reliable system sequencing and fault detection for fixed-output configurations. |
| Junction Temp Range | –40°C to +150°C - validated for under-hood automotive and high-ambient industrial environments. |
Pinout & Package
LT8609AJDDM#TRPBF uses a 10-lead (3mm × 3mm) plastic side-wettable DFN package with exposed thermal pad (Pin 11 = GND), optimized for automated optical inspection and high thermal performance (θJA = 45°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 3.0V–42V; requires local ceramic bypass capacitor to minimize high-frequency noise injection. |
| 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 layout to reduce 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 set resistor | Resistor to GND sets oscillator frequency (200kHz–2.2MHz); determines inductor size and efficiency trade-off. |
| SYNC | Sync/spread-spectrum control | Ground for Burst Mode; float for pulse-skipping; 3.2V–5V for spread-spectrum EMI reduction. |
| EN/UV | Enable/UVLO input | 1.05V rising threshold with 50mV hysteresis; enables programmable input undervoltage lockout. |
| PG | Power-good open-drain flag | Active-low signal indicating VOUT within ±7.5% of target; valid when VIN > 3.2V regardless of EN state. |
| TR/SS | Soft-start/tracking | Capacitor-programmed voltage ramp; enables controlled startup and supply tracking with external sources. |
| VOUT | Fixed output voltage | 3.3V or 5V regulated output (model-dependent); connects internal feedback divider; used instead of FB on fixed versions. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode® | 2.5µA input current at no load preserves battery life in always-on automotive modules. |
| Spread-spectrum modulation | Reduces peak EMI by ±10% frequency dithering when SYNC is biased at 3.2V–5V. |
| Side-wettable DFN package | Enables automated AOI of solder joints on exposed flanks-critical for automotive process validation. |
| AEC-Q100 Grade 1 qualified | Validated for operation from –40°C to +150°C junction temperature per automotive reliability standards. |
| Integrated top/bottom MOSFETs | Eliminates external power switches; 185mΩ high-side and 115mΩ low-side RDS(on) enable high efficiency at 3A. |
Applications
| GSM Transceiver Power | Automotive Infotainment Core Rail |
|---|---|
Use Scenario: Powering GSM modem baseband and RF sections in telematics units with strict sleep-current budgets. IC Role / Device Role / Timing Role: Primary 3.3V/5V step-down regulator delivering clean, low-noise power during active transmission and ultra-low-IQ standby. Use Value: 2.5µA quiescent current extends vehicle battery life during weeks-long parking modes without parasitic drain. | Use Scenario: Supplying core logic voltage to infotainment SoCs requiring tight regulation and thermal robustness under hood. IC Role / Device Role / Timing Role: High-current, high-temperature DC/DC converter providing stable 3.3V/5V rail with AEC-Q100 compliance. Use Value: 150°C junction rating and side-wettable DFN ensure long-term reliability in sealed enclosures near engine compartments. |
| Low-EMI Industrial Sensor Hub | Start-Stop Vehicle Microcontroller Supply |
Use Scenario: Powering precision analog sensor front-ends and ADCs in factory automation nodes where conducted EMI disrupts measurements. IC Role / Device Role / Timing Role: Synchronous buck regulator using spread-spectrum SYNC biasing to suppress narrowband EMI peaks. Use Value: Spread-spectrum modulation reduces 100–200MHz radiated emissions by >10dB, easing EMC certification. | Use Scenario: Regulating battery-supplied 12V down to 3.3V for MCU and CAN transceivers during engine cranking (4.5V–5.5V dips). IC Role / Device Role / Timing Role: Wide-input buck converter maintaining regulation through cold-crank transients with fast line/load transient response. Use Value: 45ns min on-time and peak current mode control prevent dropout during 4.5V input dips at full 3A load. |
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#TRPBF | Junction temp range limited to –40°C to +125°C; identical electrical specs and pinout. | Suitable for cabin electronics but not under-hood applications requiring 150°C operation. | Select LT8609AJDDM#TRPBF when ambient temperatures exceed 125°C or AEC-Q100 Grade 0/1 compliance is mandatory. |
| LT8609AIMSE16#TRPBF | 16-lead MSOP package; same J-grade temp rating but larger footprint and higher θJA (40°C/W). | Preferred where manual rework or thermal vias are impractical; less suitable for space-constrained automotive modules. | Choose LT8609AJDDM#TRPBF for miniaturized designs needing side-wettable DFN for AOI and lower profile. |
Compared with LT8609AEDDM#TRPBF and LT8609AIMSE16#TRPBF, LT8609AJDDM#TRPBF uniquely combines AEC-Q100 Grade 1 qualification, side-wettable DFN for automated inspection, and identical 3A/42V performance in the smallest thermally efficient package.
Availability
LT8609AJDDM#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, telematics, and industrial sensor hub designs requiring stable component supply, AEC-Q100 compliance, and ultralow quiescent current operation.
Supply support for LT8609AJDDM#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 synchronous step-down conversion in space- and power-constrained applications-especially where ultralow IQ and automotive qualification are critical.
FAQ
What is the maximum input voltage rating for LT8609AJDDM#TRPBF?
The LT8609AJDDM#TRPBF has an absolute maximum input voltage rating of 42V on the VIN pin, with guaranteed operation across 3.0V to 42V. This enables direct connection to 24V industrial rails and 12V automotive systems including cold-crank and load-dump transients when properly clamped.
Does LT8609AJDDM#TRPBF support fixed 3.3V or 5V output without external resistors?
Yes, LT8609AJDDM#TRPBF is a fixed-output variant-either 3.3V or 5V depending on part marking-and uses internal feedback dividers (5.9MΩ for 3.3V, 8.95MΩ for 5V). No external FB resistors are required, simplifying layout and improving accuracy over temperature.
How does the SYNC pin function on LT8609AJDDM#TRPBF?
On LT8609AJDDM#TRPBF, the SYNC pin enables three operating modes: grounded for low-ripple Burst Mode®, floating for pulse-skipping, or biased at 3.2V–5.0V for spread-spectrum EMI reduction. Unlike the LT8609B, it retains full SYNC functionality and is not NC.
What thermal performance can be expected from the DFN package of LT8609AJDDM#TRPBF?
The LT8609AJDDM#TRPBF's 3mm × 3mm side-wettable DFN achieves θJA = 45°C/W with standard 2-layer PCB layout and thermal vias to internal ground planes. With proper copper area and 6+ thermal vias under the exposed pad, junction-to-ambient rise stays below 40°C at 3A continuous load.
Is LT8609AJDDM#TRPBF pin-compatible with other LT8609A variants in the same package?
Yes, all LT8609A variants in the 10-lead DFN package-including LT8609AJDDM#TRPBF, LT8609AEDDM#TRPBF, and LT8609AHDDM#TRPBF-share identical pinout, footprint, and solder mask design. Only temperature grade and output voltage differ between these models.
LT8609AJDDM#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)
LT8609AJDDM#TRPBF FAQ
1.How can I place an order for LT8609AJDDM#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AJDDM#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#TRPBF reliable?
The price and inventory of LT8609AJDDM#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8609AJDDM#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AJDDM#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AJDDM#TRPBF?
LT8609AJDDM#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AJDDM#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#TRPBF?
For technical support, including LT8609AJDDM#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AJDDM#TRPBF requirements.
6.How does Aetrix verify that LT8609AJDDM#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8609AJDDM#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8609AJDDM#TRPBF?
All LT8609AJDDM#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AJDDM#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#TRPBF part is unused and in its original packaging.
Return procedure for LT8609AJDDM#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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