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Analog Devices Inc. LT8609SIV#PBF
- Part No.:
- LT8609SIV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFQFN Exposed Pad
- Datasheet:
-
LT8609SIV#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 16LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,336
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Product details
Overview
LT8609SIV#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 regulated 3.3V/5V outputs in automotive infotainment power rails requiring high transient response and low-noise operation.
For engineers reviewing the LT8609SIV#PBF datasheet, LT8609SIV#PBF pinout, LT8609SIV#PBF application, or LT8609SIV#PBF equivalent, key selection criteria include input voltage range (3.0–42V), peak current limit (4.75A), thermal performance in LQFN-16, and spread-spectrum synchronization capability for CISPR 25 Class 5 compliance.
Technical Context
The LT8609SIV#PBF implements peak current mode control with internal compensation, enabling fast transient response and stable loop behavior using small external inductors. Its Silent Switcher® 2 architecture integrates internal bypass capacitors and symmetrical layout to suppress common-mode EMI without requiring complex PCB layout mitigation.
It supports three operating modes: Burst Mode (1.7µA IQ, <10mVP-P ripple), pulse-skipping (SYNC floating), and spread-spectrum modulation (SYNC tied to 3.2–5V). 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 - sustains full load at 125°C junction temperature with proper PCB copper area |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT - enables >10-year battery life in always-on vehicle modules |
| Minimum On-Time | 45ns - allows high step-down ratios (e.g., 42V→3.3V) at 2MHz switching without pulse skipping |
| Feedback Reference | 0.774V ±0.014V - enables precise output regulation with 1% resistors and minimal divider loading |
| EMI Performance | CISPR 25 Class 5 compliant - meets automotive radiated emission limits without external filters in typical layouts |
| Switching Frequency | 200kHz to 2.2MHz - adjustable via RT pin; higher frequencies reduce inductor/capacitor size but trade off efficiency |
Pinout & Package
The LT8609SIV#PBF is housed in a thermally enhanced 16-lead 3mm × 3mm LQFN package with exposed GND pad (Pin 17), requiring soldering to PCB for optimal thermal performance (θJA = 31°C/W on demo board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (1) | Frequency Set Input | Resistor-to-GND sets switching frequency (200kHz–2.2MHz); determines inductor size and efficiency trade-off |
| INTVCC (2) | Internal Regulator Bypass | 3.5V internal supply output; must be decoupled with ≥1µF ceramic capacitor to GND for gate drive stability |
| GND (3,4,8,14,17) | Power & Signal Ground | Multiple GND pins and exposed pad minimize thermal resistance and high-frequency return path impedance |
| SW (5,6) | Power Switch Node | Connects to inductor and boost capacitor; requires minimal PCB trace area to reduce EMI and switching losses |
| VIN (9,10) | Main Power Input | Supplies internal circuitry and top switch; must be locally bypassed with low-ESR ceramic capacitor near pins |
| EN/UV (11) | Enable / UVLO Input | 1.05V rising threshold enables startup; external resistor divider programs input undervoltage lockout |
| PG (12) | Power Good Flag | Open-drain output asserts low when VOUT deviates >±8.5% from target or fault occurs; requires pull-up |
| FB (13) | Feedback Input | Regulated to 0.774V; connects to resistor divider tap for output voltage programming |
| TR/SS (15) | Soft-Start / Tracking | Capacitor here controls output ramp rate; also enables output voltage tracking during sequencing |
| SYNC (16) | Sync / Spread-Spectrum Control | Ground = Burst Mode; float = pulse-skipping; 3.2–5V = spread-spectrum; clock input = external sync |
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 Burst Mode enables direct connection to vehicle battery without auxiliary wake-up circuitry |
| 45ns Minimum On-Time | Enables 42V→3.3V conversion at 2MHz without duty-cycle limitation or frequency foldback |
| AEC-Q100 Qualified | Rated for –40°C to +125°C junction temperature; qualified per AEC-Q100 Rev H for automotive reliability |
| Internal Compensation | Eliminates external compensation network; reduces BOM count and design iteration time for stable 2A operation |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powering SoC, DSP, and display interfaces in head units with strict EMI limits and cold-crank survival requirements. IC Role / Device Role / Timing Role: Primary 5V/3.3V buck converter delivering 2A continuous with 3A peak support for GSM burst transmission. Use Value: Silent Switcher® 2 ensures CISPR 25 Class 5 compliance without added filter components, reducing solution size and cost. | Use Scenario: Providing clean, low-noise 3.3V rail to image sensors and ISP processors in surround-view camera systems. IC Role / Device Role / Timing Role: High-efficiency, low-ripple DC/DC regulator with soft-start to prevent sensor reset during power-up. Use Value: 2.5µA quiescent current extends battery backup runtime; 45ns min on-time maintains regulation during 42V load-dump events. |
| Telematics Control Unit (TCU) | Body Control Module (BCM) Sub-Regulator |
Use Scenario: Generating isolated 3.3V logic supply from 12V battery in cellular-connected TCU with CAN FD interface. IC Role / Device Role / Timing Role: Main system regulator supporting LTE modem bursts and GPS acquisition pulses up to 3A for <1sec. Use Value: Peak current limit of 4.75A prevents shutdown during RF transmit; spread-spectrum mode lowers EMI coupling into CAN bus. | Use Scenario: Powering microcontroller, LIN transceivers, and LED drivers in door module with always-on wake capability. IC Role / Device Role / Timing Role: Low-IQ buck converter maintaining 3.3V output during sleep mode while monitoring wake inputs. Use Value: 1µA shutdown current (EN/UV = 0V) minimizes parasitic drain; PG flag enables safe MCU boot sequencing. |
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#PBF | Same electrical specs; rated for 0°C to 125°C junction temperature (vs –40°C to 125°C for LT8609SIV#PBF) | Not qualified for extended automotive ambient conditions; unsuitable for under-hood or rear-seat HVAC modules | Select LT8609SIV#PBF for full AEC-Q100 temperature range compliance in passenger cabin or engine bay proximity locations. |
| LT8609SIV#WPBF | Identical silicon and package; manufactured under automotive-specific process controls and traceability (W suffix) | Required for production automotive programs needing PPAP documentation and AEC reliability reports | Choose LT8609SIV#WPBF when OEM sourcing mandates automotive-grade manufacturing flow and long-term supply assurance. |
Compared with LT8609SEV#PBF, the LT8609SIV#PBF guarantees operation down to –40°C and includes full AEC-Q100 qualification evidence; compared with LT8609SIV#WPBF, it offers identical performance but without automotive process controls-making it suitable for industrial or non-OEM automotive designs where cost sensitivity outweighs PPAP requirements.
Availability
LT8609SIV#PBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and telematics control units requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LT8609SIV#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, industrial, automotive, and communications markets.
The LT8609SIV#PBF belongs to the Silent Switcher® family of high-efficiency, low-EMI DC/DC regulators designed specifically for automotive and noise-sensitive embedded systems where compact size and regulatory compliance are critical.
FAQ
What is the maximum continuous output current of the LT8609SIV#PBF?
The LT8609SIV#PBF delivers 2A continuous output current at full load with proper PCB thermal design (≥2 cm² 2-oz copper on top/bottom layers connected to exposed pad). Peak transient capability reaches 3A for durations under 1 second, supporting GSM and LTE transmit bursts without dropout. Derating applies above 85°C ambient; full 2A is guaranteed up to 125°C junction temperature per AEC-Q100 test conditions.
How does the LT8609SIV#PBF achieve ultralow EMI performance?
The LT8609SIV#PBF achieves ultralow EMI through Silent Switcher® 2 architecture: integrated input bypass capacitors, symmetrical SW node layout, and minimized hot-loop area suppress common-mode radiation. Measured on DC2522A demo board, it meets CISPR 25 Class 5 radiated limits without external filters at 14V→5V/2A, 2MHz operation-reducing design risk and board space versus legacy buck converters requiring ferrite beads or shielded inductors.
Can the LT8609SIV#PBF operate with an input voltage as low as 3.0V?
Yes, the LT8609SIV#PBF operates down to 2.7V minimum input (typical), with guaranteed functionality from 3.0V to 42V. At 3.0V input, it supports output voltages down to ~2.5V (accounting for top switch RDS(ON) drop), making it suitable for single-cell LiFePO4 or supercapacitor backup supplies. The EN/UV pin can be configured to hold off startup until VIN exceeds a user-defined threshold, preventing brownout during battery recovery.
What is the purpose of the TR/SS pin on the LT8609SIV#PBF?
The TR/SS (Track/Soft-Start) pin on the LT8609SIV#PBF serves dual functions: (1) Soft-start-connecting a capacitor programs controlled VOUT ramp rate during power-up to limit inrush current; (2) Tracking-driving TR/SS with an external voltage source forces VOUT to follow that reference, enabling power sequencing with other rails. An internal 2µA current source pulls TR/SS up, allowing simple RC-based timing without external bias.
Is the LT8609SIV#PBF pin-compatible with other members of the LT8609S family?
Yes, all LT8609S variants-including LT8609SIV#PBF, LT8609SEV#PBF, and LT8609SIV#WPBF-share identical 16-lead 3mm × 3mm LQFN pinout, footprint, and thermal pad configuration. No PCB redesign is needed when migrating between temperature grades or automotive qualification levels; only bill-of-materials and sourcing documentation differ. This simplifies design reuse across industrial, commercial, and automotive platforms.
LT8609SIV#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)
LT8609SIV#PBF FAQ
1.How can I place an order for LT8609SIV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609SIV#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 LT8609SIV#PBF reliable?
The price and inventory of LT8609SIV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609SIV#PBF is usually 5 days.
3.What payment methods are accepted for LT8609SIV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609SIV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609SIV#PBF?
LT8609SIV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609SIV#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 LT8609SIV#PBF?
For technical support, including LT8609SIV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609SIV#PBF requirements.
6.How does Aetrix verify that LT8609SIV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8609SIV#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 LT8609SIV#PBF meets industry standards.
7.What is the process for return or replacement of LT8609SIV#PBF?
All LT8609SIV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609SIV#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 LT8609SIV#PBF part is unused and in its original packaging.
Return procedure for LT8609SIV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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