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Analog Devices Inc. LT8609SIV#TRPBF
- Part No.:
- LT8609SIV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFQFN Exposed Pad
- Datasheet:
-
LT8609SIV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A 16LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:148
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Product details
Overview
LT8609SIV#TRPBF from Analog Devices is a 42V, 2A continuous/3A peak synchronous step-down regulator in a 3mm × 3mm LQFN package, featuring 2.5µA quiescent current in Burst Mode, 45ns minimum on-time, and internal compensation for fast transient response. It delivers regulated 3.3V or 5V outputs in automotive infotainment power rails requiring ultralow EMI and high light-load efficiency.
For engineers reviewing the LT8609SIV#TRPBF datasheet, LT8609SIV#TRPBF pinout, LT8609SIV#TRPBF application, or LT8609SIV#TRPBF equivalent, key selection criteria include input voltage range (3.0–42V), peak current limit (4.75A typ), SYNC-controlled spread-spectrum modulation, PG flag accuracy (±8.5%), and AEC-Q100 qualification for automotive use.
Technical Context
The LT8609SIV#TRPBF implements peak current mode control with internal compensation, enabling stable operation with small inductors and fast load-step response. Its Silent Switcher® 2 architecture integrates internal bypass capacitors and optimized layout to suppress radiated EMI without external filters.
It supports three operating modes: Burst Mode (1.7µA IQ, <10mVP-P ripple), pulse-skipping (SYNC float), and spread-spectrum modulation (SYNC tied to 3.2–5V). Frequency is programmable from 200kHz to 2.2MHz via RT resistor, with foldback disabled when SYNC is driven externally.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports wide automotive battery transients including cold-crank (4.5V) and load-dump (40V). |
| Continuous Output Current | 2A - sufficient for powering microcontrollers, sensors, and CAN transceivers in ADAS modules. |
| Peak Transient Current | 3A (<1 sec) - handles GSM/GNSS burst loads without dropout or thermal shutdown. |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT - enables >10-year battery life in always-on telematics systems. |
| Minimum On-Time | 45ns - allows high VIN/VOUT ratios (e.g., 24V→3.3V) at 2MHz switching without pulse skipping. |
| Feedback Reference | 0.774V ±0.014V - sets output accuracy; used with resistor divider to program 3.3V, 5V, or custom voltages. |
| PG Accuracy | ±8.5% of VFB - provides reliable power-good signaling for FPGA/CPU sequencing in automotive ECUs. |
Pinout & Package
The LT8609SIV#TRPBF is housed in a thermally enhanced 16-lead 3mm × 3mm LQFN package with exposed GND pad (Pin 17), requiring soldering to PCB for thermal management and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (1) | Frequency programming input | Resistor-to-GND sets switching frequency from 200kHz to 2.2MHz; determines inductor size and efficiency trade-off. |
| INTVCC (2) | Internal 3.5V regulator output | Bypass with ≥1µF ceramic capacitor; powers gate drivers and control logic; not for external loading. |
| GND (3,4,8,14,17) | Power and signal ground | Multiple pins + exposed pad reduce thermal resistance (θJC = 14°C/W) and improve EMI performance. |
| SW (5,6) | Switch node | Connects to inductor and bootstrap capacitor; must be minimized on PCB to reduce ringing and radiated emissions. |
| VIN (9,10) | Main input supply | Supplies internal circuitry and top switch; requires local 22µF ceramic input capacitor with low ESR. |
| EN/UV (11) | Enable and undervoltage lockout | 1.05V rising threshold; used to shut down IC or program VIN UVLO with external resistor divider. |
| PG (12) | Power-good open-drain flag | Pulls low when VOUT deviates >±8.5% from target or during fault; requires external pull-up for host processor monitoring. |
| FB (13) | Feedback input | Regulated to 0.774V; connects to resistor divider tap; phase-lead capacitor (10pF) recommended with high-value dividers. |
| TR/SS (15) | Soft-start and tracking | 2µA internal current source charges external capacitor to control VOUT ramp rate; pulled low during fault/shutdown. |
| SYNC (16) | External clock interface | Ground for Burst Mode; float for pulse-skipping; 3.2–5V for spread-spectrum; disables frequency foldback when driven. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® 2 Architecture | Integrated bypass capacitors and symmetrical layout reduce radiated EMI by >30dB vs conventional QFN, meeting CISPR 25 Class 5 limits without shielding. |
| Ultralow Quiescent Current | 2.5µA IQ in Burst Mode enables >10-year shelf life in battery-backed automotive modules such as toll tags and remote keyless entry receivers. |
| Fast Minimum On-Time | 45ns enables 2MHz operation at high input-to-output voltage ratios (e.g., 24V→3.3V), minimizing inductor size while avoiding pulse skipping. |
| AEC-Q100 Qualified | Rated for –40°C to +125°C junction temperature with full characterization across automotive temperature range; qualified per Grade 1 requirements. |
| Internal Compensation | Eliminates external compensation components, reducing BOM count and layout sensitivity while maintaining stability with 0.47–2.2µH inductors. |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Providing clean, low-noise 5V/2A power to LCD displays, touch controllers, and audio codecs in head units. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated output with soft-start sequencing and PG confirmation for system boot. Use Value: Silent Switcher® 2 ensures display video remains free of switching artifacts; 2.5µA IQ extends battery backup runtime during ignition-off states. | Use Scenario: Powering 3.3V image sensor and ISP in forward-facing camera modules subject to engine bay thermal cycling. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with thermal derating and fault reporting via PG pin for safety-critical vision processing. Use Value: 45ns min-on-time supports 12V→3.3V conversion at 2MHz, shrinking filter size; AEC-Q100 qualification ensures reliability at 125°C junction temp. |
| Telematics Control Unit (TCU) | GSM/GNSS Transceiver Supply |
Use Scenario: Generating 3.3V for LTE modem, GPS receiver, and CAN controller in vehicle connectivity gateways. IC Role / Device Role / Timing Role: Main system power rail with EN/UV-based wake-up and PG-driven reset assertion for secure boot sequence. Use Value: 3A peak capability handles LTE transmission bursts without brownout; spread-spectrum SYNC reduces EMI coupling into GNSS antenna. | Use Scenario: Delivering pulsed 2A/3A current to cellular transceivers during RF transmit events in emergency call (eCall) systems. IC Role / Device Role / Timing Role: High-transient-current buck regulator with fast loop response and internal current limiting to prevent overcurrent damage. Use Value: Peak current limit of 4.75A protects against short circuits; 2A continuous rating sustains modem operation between bursts. |
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 |
|---|---|---|---|
| LT8609SEV#TRPBF | Same silicon, commercial temperature grade (–40°C to 125°C), non-automotive marking; identical electrical specs and pinout. | Not AEC-Q100 qualified; unsuitable for automotive production but valid for prototyping and industrial designs. | Select LT8609SEV#TRPBF only for non-automotive applications where AEC-Q100 compliance is not required. |
| LT8640SIV#TRPBF | Higher 4A continuous output, same 42V input, 2.5µA IQ, and Silent Switcher 2; larger 4mm × 4mm LQFN package with different pinout. | Requires PCB redesign due to different footprint and pin assignment; supports higher current loads in next-gen ADAS ECUs. | Choose LT8640SIV#TRPBF when >2A continuous current is needed and board space allows larger package. |
Compared with LT8609SEV#TRPBF, the LT8609SIV#TRPBF adds AEC-Q100 qualification and automotive traceability; versus LT8640SIV#TRPBF, it offers smaller footprint and lower cost for 2A-class applications without sacrificing EMI performance or quiescent current.
Availability
LT8609SIV#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and telematics control units requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8609SIV#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 LT8609S product line delivers ultralow-IQ, high-voltage synchronous buck regulators optimized for automotive subsystems demanding robust EMI performance, wide input range, and extended temperature operation.
FAQ
What is the maximum continuous output current of the LT8609SIV#TRPBF?
The LT8609SIV#TRPBF delivers 2A of continuous output current under typical thermal conditions (θJA = 31°C/W on demo board). At elevated ambient temperatures or with reduced airflow, derating applies-e.g., ~1.6A at 85°C ambient with 2-layer PCB. The device supports 3A peak for <1 second, enabling transient load handling in GSM/GNSS transceivers. Current capability depends on inductor selection, PCB copper area, and airflow; full details are in the Thermal Considerations section of the LT8609SIV#TRPBF datasheet.
Does the LT8609SIV#TRPBF require external compensation components?
No, the LT8609SIV#TRPBF features internal compensation using peak current mode control, eliminating the need for external Type II or Type III compensation networks. This simplifies design, reduces BOM count, and improves layout robustness-especially critical in automotive applications where reliability and manufacturing consistency are paramount. Stability is maintained across the full 0.47µH to 2.2µH inductor range specified in the datasheet, provided the RT resistor and output capacitor ESR meet recommended values.
How does the SYNC pin affect EMI performance in the LT8609SIV#TRPBF?
The SYNC pin on the LT8609SIV#TRPBF directly controls EMI behavior: grounding it enables low-ripple Burst Mode with minimal conducted/radiated noise; floating it activates pulse-skipping mode with higher baseline IQ; tying it to 3.2–5V enables spread-spectrum modulation, which dithers the switching frequency to smear energy across a wider band and reduce peak emissions by up to 10dB. Radiated EMI test data (CISPR 25 Class 5) confirms that spread-spectrum mode meets stringent automotive limits even without external EMI filters on the DC2522A demo board.
Is the LT8609SIV#TRPBF pin-compatible with other parts in the LT8609 family?
Yes, the LT8609SIV#TRPBF shares identical pinout, package dimensions (3mm × 3mm LQFN), and footprint with all variants in the LT8609S family-including LT8609SEV#TRPBF (commercial grade) and LT8609SIV#WPBF (automotive W-grade). This allows direct substitution within the same temperature grade without PCB changes. However, LT8609SIV#TRPBF is not pin-compatible with earlier LT8609 (non-S) or LT8609B variants, which differ in pin function allocation and thermal pad configuration.
What is the purpose of the TR/SS pin on the LT8609SIV#TRPBF?
The TR/SS (Track/Soft-Start) pin on the LT8609SIV#TRPBF serves dual functions: (1) Soft-start-charging an external capacitor with its internal 2µA current source controls VOUT ramp rate during power-up, preventing inrush current and downstream reset glitches; (2) Tracking-when driven below 0.774V by an external source, it forces FB regulation to match TR/SS voltage, enabling precise power sequencing with other rails. During fault or shutdown, TR/SS is actively pulled low via a 300Ω MOSFET, ensuring controlled discharge.
LT8609SIV#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®2
- Package/Case:
- 16-TFQFN 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:
- 2A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-LQFN (3x3)
LT8609SIV#TRPBF FAQ
1.How can I place an order for LT8609SIV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609SIV#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 LT8609SIV#TRPBF reliable?
The price and inventory of LT8609SIV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609SIV#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8609SIV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609SIV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609SIV#TRPBF?
LT8609SIV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609SIV#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 LT8609SIV#TRPBF?
For technical support, including LT8609SIV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609SIV#TRPBF requirements.
6.How does Aetrix verify that LT8609SIV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8609SIV#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 LT8609SIV#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8609SIV#TRPBF?
All LT8609SIV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609SIV#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 LT8609SIV#TRPBF part is unused and in its original packaging.
Return procedure for LT8609SIV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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