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Analog Devices Inc. LT8609SEV#PBF
- Part No.:
- LT8609SEV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFQFN Exposed Pad
- Datasheet:
-
LT8609SEV#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 16LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:431
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Product details
Overview
LT8609SEV#PBF from Analog Devices is a 42V, 2A continuous synchronous step-down regulator with 2.5µA quiescent current in Burst Mode, 45ns minimum on-time, and Silent Switcher® 2 architecture for ultralow EMI. It delivers up to 3A peak transient current and operates from 3.0V to 42V input, supporting automotive infotainment power rails and GSM transceiver burst loads.
For engineers reviewing the LT8609SEV#PBF datasheet, LT8609SEV#PBF pinout, LT8609SEV#PBF application, or LT8609SEV#PBF equivalent, key selection criteria include its AEC-Q100 qualification, spread-spectrum synchronization capability, internal compensation, 0.774V feedback reference, and 16-lead 3mm × 3mm LQFN package with exposed thermal pad.
Technical Context
The LT8609SEV#PBF implements peak current mode control with internal compensation, enabling fast transient response and stable operation with small inductors. Its Silent Switcher® 2 architecture integrates internal bypass capacitors and symmetrical layout to suppress radiated EMI without requiring special PCB stackup or shielding.
It supports three operating modes: Burst Mode (1.7µA IQ, <10mVP-P ripple), pulse-skipping (SYNC floating), and spread-spectrum modulation (SYNC tied to 3.2–5.0V). Frequency is programmable from 200kHz to 2.2MHz via RT pin resistor, with foldback enabled only when SYNC is grounded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports wide automotive battery transients and industrial 24V/36V rails |
| Output Current | 2A continuous, 3A peak (<1s) - sustains GSM PTT bursts and CPU core load steps |
| Quiescent Current | 2.5µA at no load (12VIN→3.3VOUT) - enables >10-year battery life in always-on telematics |
| Switching Frequency | 200kHz to 2.2MHz - allows 2.2µH inductor at 2MHz for compact 5V/2A solutions |
| Feedback Reference | 0.774V ±12mV - sets output accuracy; enables precise 3.3V, 5V, or adjustable rail generation |
| Min On-Time | 45ns - supports high VIN/VOUT ratios (e.g., 42V→3.3V) without pulse skipping |
| EMI Performance | CISPR 25 Class 5 compliant with filter - meets automotive EMC requirements without ferrite beads |
Pinout & Package
The LT8609SEV#PBF is housed in a thermally enhanced 16-lead 3mm × 3mm LQFN package with exposed GND pad (Pin 17), requiring soldering to PCB for thermal and electrical integrity. Pin pitch is 0.5mm; JEDEC MSL Level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (1) | Frequency programming input | Resistor to GND sets switching frequency (200kHz–2.2MHz); determines inductor size and efficiency trade-off |
| INTVCC (2) | Internal 3.5V regulator bypass | Must be decoupled with ≥1µF ceramic capacitor; powers gate drivers and control logic |
| GND (3,4,8,14,17) | Power and signal ground | Multiple pins + exposed pad minimize thermal resistance (θJC = 14°C/W) and improve EMI performance |
| SW (5,6) | Switch node | Connects to inductor and bootstrap capacitor; requires minimal PCB copper area to reduce ringing and EMI |
| VIN (9,10) | Main input supply | Supplies internal circuitry and top switch; must be locally bypassed with low-ESR capacitor near pins |
| EN/UV (11) | Enable and input UVLO input | 1.05V rising threshold; enables programmable undervoltage lockout or shutdown to 1µA input current |
| PG (12) | Power good open-drain flag | Pulls low when VOUT deviates >±8.5% from target or fault occurs; requires external pull-up |
| FB (13) | Feedback input | Regulated to 0.774V; connects to resistor divider for output voltage setting and tracking |
| TR/SS (15) | Soft-start and tracking control | 2µA internal current source charges external capacitor to control VOUT ramp rate; enables sequencing |
| SYNC (16) | External clock/spectrum control | GND = Burst Mode; float = pulse-skipping; 3.2–5.0V = spread-spectrum; >2.7V = sync input accepted |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® 2 Architecture | Integrated bypass capacitors and balanced SW node layout reduce radiated EMI by >30dB vs conventional QFN |
| Ultralow Quiescent Current | 2.5µA IQ in regulation enables >10-year shelf life in battery-backed automotive modules |
| Fast Minimum On-Time | 45ns enables direct 42V-to-3.3V conversion without pre-regulator, reducing BOM count |
| Internal Compensation | Eliminates external compensation network; simplifies design and improves stability across temperature |
| AEC-Q100 Qualified | Rated for –40°C to +125°C junction temperature; qualified per automotive reliability stress test standards |
| Spread Spectrum Modulation | Reduces peak EMI amplitude by spreading switching energy over ±100kHz bandwidth at 0.5–6kHz rate |
Applications
| Automotive Infotainment Power | GSM/GPRS Transceiver Supply |
|---|---|
Use Scenario: Powering display controller, audio codec, and touch processor in head unit with cold-crank (4.5V) and load-dump (42V) immunity. IC Role / Device Role / Timing Role: Primary 5V/2A buck converter with AEC-Q100 qualification and EMI robustness for safety-critical cabin electronics. Use Value: Eliminates need for external EMI filters and pre-regulators while maintaining <10mVP-P ripple during RF transmit bursts. | Use Scenario: Delivering 2A peak current to GSM PA during PTT (push-to-talk) transmission with 3A transient support. IC Role / Device Role / Timing Role: High-transient-response synchronous buck supplying PA bias rail with sub-100ns load-step recovery. Use Value: Sustains 3A peak for <1 second without dropout or thermal shutdown, enabling reliable voice transmission. |
| Telematics Control Unit (TCU) | Industrial IoT Sensor Hub |
Use Scenario: Always-on 3.3V rail for GPS module, cellular modem, and CAN transceiver in vehicle black box with 10-year battery backup. IC Role / Device Role / Timing Role: Ultra-low-IQ buck regulator providing regulated 3.3V from 9–36V vehicle bus with wake-on-CAN capability. Use Value: 2.5µA quiescent current extends primary LiSOCl₂ battery life beyond 10 years in sleep mode. | Use Scenario: Compact 5V/2A power stage for edge AI sensor node with BLE/Wi-Fi coexistence and strict EMI limits. IC Role / Device Role / Timing Role: EMI-optimized buck supplying microcontroller, IMU, and wireless SoC on single-layer PCB. Use Value: Meets CISPR 25 Class 5 radiated emissions without shielded inductors or metal cans, reducing cost and height. |
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 |
|---|---|---|---|
| LT8609SIV#PBF | Same silicon, industrial-grade (-40°C to +125°C), non-AEC-Q100 qualified; identical electrical specs and pinout | Not approved for automotive safety-critical systems; suitable for industrial controls and telecom infrastructure | Select LT8609SIV#PBF only if AEC-Q100 is not required and cost sensitivity outweighs automotive qualification needs |
| MP2451DT-LF-Z | 36V max input, 0.6A output, 2.2µA IQ, no spread spectrum, no PG flag, SOIC-8 package | Lacks peak current capability, EMI features, and automotive qualification; limited to low-power auxiliary rails | Use MP2451DT-LF-Z only for cost-sensitive, non-automotive, sub-1A applications where EMI is not constrained |
Compared with LT8609SIV#PBF, the LT8609SEV#PBF adds AEC-Q100 qualification and automotive reliability reporting; compared with MP2451DT-LF-Z, it delivers 3.3× higher output current, 42V rating, integrated EMI suppression, and power-good signaling-enabling single-chip compliance in demanding automotive and industrial designs.
Availability
LT8609SEV#PBF is available at Aetrix Electronics and suitable for automotive infotainment, telematics control units, and industrial IoT sensor hubs requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8609SEV#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 LT8609S product line delivers ultralow-noise, high-efficiency DC/DC regulators for automotive and industrial applications demanding AEC-Q100 qualification, ultralow IQ, and certified EMI performance.
FAQ
What is the maximum input voltage rating for the LT8609SEV#PBF?
The LT8609SEV#PBF has an absolute maximum input voltage rating of 42V on the VIN pins. It operates continuously from 3.0V to 42V, making it suitable for automotive applications with load-dump transients. Exceeding 42V may cause permanent damage, and operation above this limit is not guaranteed even for short durations.
Does the LT8609SEV#PBF require external compensation components?
No, the LT8609SEV#PBF uses internal compensation with peak current mode control, eliminating the need for external compensation networks. This simplifies design, reduces component count, and ensures loop stability across temperature and load conditions without tuning.
How does the LT8609SEV#PBF achieve ultralow EMI performance?
The LT8609SEV#PBF achieves ultralow EMI through Silent Switcher® 2 architecture: integrated input bypass capacitors, symmetrical SW node layout, and minimized hot-loop area. It meets CISPR 25 Class 5 radiated emissions with standard PCB layout and optional EMI filter-no shielding or special stackup required.
What is the function of the TR/SS pin on the LT8609SEV#PBF?
The TR/SS pin on the LT8609SEV#PBF provides soft-start control and output voltage tracking. An internal 2µA current source charges an external capacitor to program VOUT ramp rate. It also accepts external voltage for power sequencing, forcing FB to track TR/SS until the target voltage is reached.
Is the LT8609SEV#PBF pin-compatible with other members of the LT8609S family?
Yes, the LT8609SEV#PBF shares identical pinout, footprint, and electrical characteristics with LT8609SIV#PBF and LT8609SEV#WPBF. All variants use the same 16-lead 3mm × 3mm LQFN package and are drop-in replacements-only qualification grade (automotive vs. industrial) and finish differ.
LT8609SEV#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®2
- Package/Case:
- 16-TFQFN Exposed Pad
- Packaging:
- Tray
- 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)
LT8609SEV#PBF FAQ
1.How can I place an order for LT8609SEV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609SEV#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 LT8609SEV#PBF reliable?
The price and inventory of LT8609SEV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609SEV#PBF is usually 5 days.
3.What payment methods are accepted for LT8609SEV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609SEV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609SEV#PBF?
LT8609SEV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609SEV#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 LT8609SEV#PBF?
For technical support, including LT8609SEV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609SEV#PBF requirements.
6.How does Aetrix verify that LT8609SEV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8609SEV#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 LT8609SEV#PBF meets industry standards.
7.What is the process for return or replacement of LT8609SEV#PBF?
All LT8609SEV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609SEV#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 LT8609SEV#PBF part is unused and in its original packaging.
Return procedure for LT8609SEV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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