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Analog Devices Inc. LT8609SEV#TRPBF
- Part No.:
- LT8609SEV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFQFN Exposed Pad
- Datasheet:
-
LT8609SEV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A 16LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,929
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Product details
Overview
LT8609SEV#TRPBF 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 supply.
For engineers reviewing the LT8609SEV#TRPBF datasheet, LT8609SEV#TRPBF pinout, LT8609SEV#TRPBF application, or LT8609SEV#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, spread-spectrum synchronization capability, internal compensation, 16-lead 3mm × 3mm LQFN package, and guaranteed –40°C to 125°C junction temperature operation.
Technical Context
The LT8609SEV#TRPBF 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 radiated EMI without requiring complex PCB layout mitigation.
It supports three operating modes: low-ripple Burst Mode (1.7µA IQ), pulse-skipping (SYNC floating), and spread-spectrum pulse-skipping (SYNC tied to 3.2–5.0V). 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 and industrial 24/36V rails |
| Continuous Output Current | 2A - sufficient for powering microcontrollers, sensors, and communication ICs |
| Peak Transient Current | 3A (<1 sec) - meets GSM burst load requirements without output collapse |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT - enables >10-year battery life in always-on automotive modules |
| Switching Frequency Range | 200kHz to 2.2MHz - allows trade-off between inductor size (e.g., 2.2µH at 2MHz) and efficiency |
| Minimum On-Time | 45ns - enables high VIN/VOUT ratios (e.g., 42V→3.3V) without pulse skipping |
| Feedback Reference Voltage | 0.774V ±1.8mV - sets output accuracy; used with resistor divider for adjustable VOUT |
| PG Accuracy | ±8.5% of VOUT - provides reliable power-good signaling for downstream sequencing |
Pinout & Package
The LT8609SEV#TRPBF is housed in a thermally enhanced 16-lead 3mm × 3mm LQFN package with exposed GND pad (Pin 17) that must be soldered to PCB for thermal and EMI performance. Pin count and footprint match standard QFN-16 layouts.
| 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 internal logic and gate drivers |
| GND (3,4,8,14,17) | Power and signal ground | Multiple pins + exposed pad reduce thermal resistance (θJC = 14°C/W) and improve EMI suppression |
| SW (5,6) | Switch node | Connects to inductor and bootstrap capacitor; requires minimal PCB copper area to limit ringing and EMI |
| VIN (9,10) | Main input supply | Supplies top switch and internal circuitry; requires local high-frequency ceramic bypass (≥22µF) |
| EN/UV (11) | Enable and input UVLO control | 1.05V rising threshold; resistor divider programs precise input undervoltage lockout |
| PG (12) | Open-drain power-good flag | Pulls low when VOUT deviates >±8.5% or fault occurs; valid only when VIN > 3.2V and EN/UV high |
| FB (13) | Feedback reference input | Regulated to 0.774V; connects to resistor divider tap for output voltage setting |
| TR/SS (15) | Soft-start and tracking control | Capacitor sets output ramp rate; enables output voltage tracking during startup or sequencing |
| SYNC (16) | External clock interface | Ground = Burst Mode; float = pulse-skipping; 3.2–5.0V = spread-spectrum modulation for EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® 2 Architecture | Integrated internal bypass capacitors and symmetrical power stage reduce radiated EMI by >30dB vs conventional buck regulators |
| AEC-Q100 Qualified (Grade 1) | Guaranteed operation from –40°C to 125°C junction temperature; qualified for automotive powertrain and body electronics |
| Ultralow Quiescent Current | 2.5µA IQ in Burst Mode enables >10-year battery life in always-on telematics and ADAS modules |
| Adjustable Spread Spectrum Modulation | SYNC pin voltage controls modulation depth (0.5–6kHz); reduces peak EMI emissions without changing layout |
| Internal Compensation | Eliminates external compensation components; simplifies design and improves stability across all operating conditions |
| Fast Minimum On-Time (45ns) | Enables high step-down ratios (e.g., 42V→3.3V at 2MHz) without duty-cycle limiting or frequency foldback |
Applications
| Automotive Infotainment Power | GSM/GPRS Transceiver Supply |
|---|---|
Use Scenario: Powering audio DSPs, display controllers, and USB-C PD controllers in head units with cold-crank (4.5V) and load-dump (42V) immunity. IC Role / Device Role / Timing Role: Primary 5V/3.3V synchronous buck converter with AEC-Q100 qualification and EMI compliance per CISPR 25 Class 5. Use Value: Eliminates need for external EMI filters; maintains <10mVP-P ripple at 2A load while meeting automotive EMC requirements. | Use Scenario: Delivering pulsed 2A–3A loads during RF transmission bursts in vehicle telematics and fleet tracking modules. IC Role / Device Role / Timing Role: High-transient-current step-down regulator with 3A peak capability and fast load-step response (<50µs). Use Value: Prevents brownout during GSM TDMA bursts; sustains regulated output without external hold-up capacitance. |
| Industrial IoT Sensor Hub | Low-Power ADAS Camera Module |
Use Scenario: Powering ARM Cortex-M7 MCUs, BLE/Wi-Fi SoCs, and analog front-ends in battery-backed edge nodes. IC Role / Device Role / Timing Role: Always-on power supply with ultralow IQ (2.5µA) and soft-start for controlled wake-up sequencing. Use Value: Extends coin-cell or supercapacitor backup runtime beyond 10 years; enables deterministic power-up timing. | Use Scenario: Supplying image sensor, ISP, and serializer in rear-view or surround-view cameras with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise, spread-spectrum synchronized buck regulator meeting ISO 11452-2/4 radiated immunity. Use Value: Passes CISPR 25 Class 5 radiated emission tests without shielded enclosures or ferrite beads. |
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#TRPBF | Same electrical specs but rated for –40°C to 125°C over full range (not just assured by design); tighter parametric guarantees across temperature | Required for safety-critical automotive applications where full-range characterization is mandated (e.g., ASIL-B systems) | Select LT8609SIV#TRPBF when full-temperature-range test data and automotive reliability reports are contractually required |
| MP2451DT-LF-Z | 36V max input, 0.6A continuous, no spread spectrum, 25µA IQ - lacks Silent Switcher EMI performance and automotive qualification | Suitable only for cost-sensitive industrial or consumer applications with relaxed EMI and temp requirements | Choose MP2451DT-LF-Z only for non-automotive designs where 42V rating, AEC-Q100, and <10mVP-P ripple are not required |
Compared with LT8609SIV#TRPBF, the LT8609SEV#TRPBF offers identical functionality but with characterization assurance rather than full-range guarantee-sufficient for most automotive body electronics. Versus MP2451DT-LF-Z, the LT8609SEV#TRPBF delivers 3.3× higher current, 10× lower IQ, 6× wider VIN, and certified EMI performance critical for automotive deployment.
Availability
LT8609SEV#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, telematics, and industrial IoT applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LT8609SEV#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 technologies, serving automotive, industrial, communications, and healthcare markets.
The LT8609S product line delivers ultralow-IQ, high-voltage synchronous buck regulators optimized for automotive and harsh-environment applications where EMI, thermal, and reliability constraints dominate design decisions.
FAQ
What is the guaranteed operating temperature range for the LT8609SEV#TRPBF?
The LT8609SEV#TRPBF is specified for operation from –40°C to 125°C junction temperature. While performance over this full range is assured by design and statistical process control, the device is guaranteed to meet all specifications from 0°C to 125°C. For applications requiring full-range guaranteed specs, the LT8609SIV#TRPBF variant is recommended. The LT8609SEV#TRPBF remains fully functional and reliable across the entire –40°C to 125°C range.
How does the LT8609SEV#TRPBF achieve ultralow EMI without external filters?
The LT8609SEV#TRPBF uses Silent Switcher® 2 architecture with integrated internal bypass capacitors and a symmetrical, balanced power stage layout that cancels magnetic fields. This eliminates high-di/dt loop areas and reduces common-mode noise at the source. As a result, the LT8609SEV#TRPBF passes CISPR 25 Class 5 radiated emissions testing on standard 2-layer PCBs without ferrite beads, shielding, or complex layout rules-unlike conventional buck regulators that require extensive filtering.
Can the LT8609SEV#TRPBF be synchronized to an external clock, and what are the voltage requirements?
Yes, the LT8609SEV#TRPBF supports external synchronization via the SYNC pin. To enable synchronization, apply a clean CMOS/TTL clock signal (0.4V low, 2.7V high) within 200kHz–2.2MHz range. For spread-spectrum modulation, tie SYNC to a DC voltage between 3.2V and 5.0V. Grounding SYNC enables low-ripple Burst Mode operation. Floating SYNC selects pulse-skipping mode. The LT8609SEV#TRPBF will not synchronize outside its programmable frequency range set by the RT resistor.
What is the purpose of the TR/SS pin on the LT8609SEV#TRPBF, and how is it used?
The TR/SS (Track/Soft-Start) pin on the LT8609SEV#TRPBF controls output voltage ramp rate during startup and enables output voltage tracking. Connecting a capacitor from TR/SS to GND programs the slew rate; a 1nF capacitor yields ~1V/ms ramp. When driven by another regulator's output, TR/SS forces the LT8609SEV#TRPBF to track that voltage until regulation is achieved. During fault or shutdown, an internal 300Ω MOSFET pulls TR/SS to GND. This functionality is essential for power sequencing in multi-rail systems using the LT8609SEV#TRPBF.
Does the LT8609SEV#TRPBF support adjustable output voltage, and what is the feedback reference voltage?
Yes, the LT8609SEV#TRPBF supports fully adjustable output voltage using a resistor divider connected to the FB pin. The internal reference voltage is precisely 0.774V (±1.8mV), and the feedback network must be designed using R1 = R2 × (VOUT/0.774 − 1). Use 1% resistors and keep total divider current below 10µA to preserve ultralow quiescent current. A 10pF capacitor from VOUT to FB is recommended when using large-value resistors to maintain phase margin.
LT8609SEV#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)
LT8609SEV#TRPBF FAQ
1.How can I place an order for LT8609SEV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609SEV#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 LT8609SEV#TRPBF reliable?
The price and inventory of LT8609SEV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609SEV#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8609SEV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609SEV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609SEV#TRPBF?
LT8609SEV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609SEV#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 LT8609SEV#TRPBF?
For technical support, including LT8609SEV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609SEV#TRPBF requirements.
6.How does Aetrix verify that LT8609SEV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8609SEV#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 LT8609SEV#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8609SEV#TRPBF?
All LT8609SEV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609SEV#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 LT8609SEV#TRPBF part is unused and in its original packaging.
Return procedure for LT8609SEV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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