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Analog Devices Inc. LT8609EMSE#PBF
- Part No.:
- LT8609EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609EMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,036
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Product details
Overview
LT8609EMSE#PBF from Analog Devices is a 42V, 3A synchronous step-down regulator with peak current mode control, 2.5µA quiescent current in Burst Mode, 45ns minimum on-time, and internal compensation. It delivers regulated 5V or adjustable output in automotive and industrial power supplies requiring ultra-low IQ and low EMI.
For engineers reviewing the LT8609EMSE#PBF datasheet, LT8609EMSE#PBF pinout, LT8609EMSE#PBF application, or LT8609EMSE#PBF equivalent, key selection factors include input voltage range (3.0–42V), synchronization capability (200kHz–2.2MHz), PG flag accuracy (±8.5% for FB), thermal grade (–40°C to 125°C), and MSOP-10 package with side-wettable flanks.
Technical Context
The LT8609EMSE#PBF implements a monolithic constant-frequency peak current mode architecture with internal 0.782V feedback reference and programmable oscillator via RT resistor. Its fast 45ns minimum on-time enables high step-down ratios at 2MHz switching, while Burst Mode operation maintains <10mVP-P ripple at µA-level loads.
It integrates top/bottom NMOS power switches (185mΩ/115mΩ), supports external synchronization or spread-spectrum modulation via SYNC pin, and features accurate 1.05V EN/UV threshold with 50mV hysteresis for reliable input UVLO programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports wide-range industrial and automotive battery inputs without pre-regulation. |
| Output Current | 3A continuous - sufficient for powering microcontrollers, sensors, and communication ICs from single-stage conversion. |
| Quiescent Current | 2.5µA in Burst Mode - enables >10-year battery life in always-on IoT nodes with 12VIN→3.3VOUT. |
| Switching Frequency | 200kHz to 2.2MHz - adjustable via RT resistor; 2MHz operation allows use of 2.2µH inductors for compact designs. |
| Feedback Reference | 0.782V ±0.004V - precise internal reference enabling ±1% output regulation over line/load/temperature. |
| Minimum On-Time | 45ns - supports high VIN/VOUT ratios (e.g., 42V→3.3V) at 2MHz without pulse-skipping instability. |
| Power Good Flag | PG asserts when FB within ±8.5% - provides reliable system reset and sequencing control for downstream logic. |
Pinout & Package
LT8609EMSE#PBF is housed in a 10-lead plastic MSOP package (MSE) with exposed GND pad (Pin 11) requiring PCB soldering for thermal and electrical integrity. θJA = 40°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply | Drives top NMOS gate above VIN; requires 0.1µF ceramic capacitor directly to SW. |
| SW | Switch node | Connects to inductor and BST capacitor; must be minimized on PCB to reduce EMI and switching losses. |
| INTVCC | Internal 3.5V regulator bypass | Supplies internal logic/drivers; decoupled with ≥1µF low-ESR ceramic to GND. |
| RT | Oscillator frequency set | Resistor to GND programs fSW from 200kHz to 2.2MHz; sets timing for current-mode control loop. |
| SYNC | External clock interface | Accepts 0V (Burst Mode), floating (pulse-skipping), or 3.2–5V (spread-spectrum) for EMI reduction. |
| EN/UV | Enable / input UVLO input | 1.05V rising threshold with 50mV hysteresis; enables programmable VIN shutdown or direct VIN tie. |
| PG | Power good open-drain flag | Signals VOUT regulation status (±8.5% for FB); valid above 3.2V VIN regardless of EN state. |
| TR/SS | Soft-start and tracking | 2µA internal pull-up enables capacitor-programmed ramp rate; supports output voltage tracking during startup. |
| FB | Feedback input | Regulated to 0.782V; connects external resistor divider for adjustable output configurations. |
| VIN | Main input supply | Supplies internal circuitry and top switch; requires local high-frequency ceramic bypass to GND. |
| GND | Power and signal ground | Exposed pad (Pin 11) must be soldered to PCB plane for thermal management and noise control. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 2.5µA IQ regulating 12VIN→3.3VOUT - extends battery runtime in always-on applications without sacrificing regulation. |
| Burst Mode operation | Maintains <10mVP-P output ripple at light loads - eliminates audible noise and avoids discontinuous conduction mode artifacts. |
| Internal compensation | Eliminates external compensation components - reduces BOM count and design iteration time for stable 3A operation. |
| Spread spectrum modulation | Reduces peak EMI by >10dB across 1–100MHz - meets CISPR 25 Class 5 requirements without added shielding or filters. |
| Accurate enable threshold | 1.05V EN/UV with 50mV hysteresis - enables precise, repeatable input UVLO setting using standard resistor dividers. |
Applications
| Automotive Infotainment Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Powering display controllers and audio codecs in head units with 12V battery input and strict EMI limits. IC Role / Device Role / Timing Role: Primary 5V/3.3V step-down regulator with SYNC-driven spread-spectrum modulation. Use Value: Meets CISPR 25 Class 5 radiated emissions without ferrite beads or metal cans, reducing system cost and board area. | Use Scenario: Providing regulated 3.3V to wireless sensor transceivers operating from 24V industrial rails. IC Role / Device Role / Timing Role: High-efficiency, low-IQ buck converter enabling multi-year battery life in remote monitoring nodes. Use Value: 2.5µA quiescent current extends CR2032-based deployments beyond 10 years while maintaining fast load transient response. |
| Portable Medical Instrumentation | Test & Measurement Equipment |
Use Scenario: Generating clean 3.3V for ADCs and microcontrollers in handheld diagnostic tools powered by Li-ion batteries. IC Role / Device Role / Timing Role: Low-noise, low-ripple power stage with soft-start and PG flag for safe system initialization. Use Value: <10mVP-P ripple ensures <16-bit ADC accuracy; TR/SS pin enables controlled power-up sequencing with host MCU. | Use Scenario: Supplying 5V to FPGA I/O banks and analog front-ends in benchtop analyzers with 42V auxiliary rails. IC Role / Device Role / Timing Role: Wide-input, high-current buck regulator supporting hot-swap and brownout resilience. Use Value: 45ns minimum on-time enables stable 42V→5V conversion at 2MHz, minimizing inductor size and improving transient immunity. |
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 |
|---|---|---|---|
| LT8609AEMSE#PBF | Fixed 5V output; slower switch edges for lower EMI; same pinout and package. | No external feedback resistors required; optimized for fixed-output systems where layout EMI margin is critical. | Select when 5V output is fixed and EMI reduction is prioritized over adjustable output flexibility. |
| LT8609BEMSE#PBF | Pulse-skipping only (no Burst Mode); no SYNC pin; higher light-load IQ (~350µA). | Simpler control interface; suitable for applications where Burst Mode ripple is unacceptable and moderate IQ is acceptable. | Select when deterministic pulse-skipping behavior is preferred and 2.5µA IQ is not required. |
Compared with LT8609AEMSE#PBF and LT8609BEMSE#PBF, the LT8609EMSE#PBF uniquely balances ultralow quiescent current, adjustable output, and EMI-reduction features-making it optimal for battery-powered and automotive systems needing both efficiency and noise control.
Availability
LT8609EMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor nodes, and portable medical instrumentation requiring stable component supply, AEC-Q100-compliant performance, and long-term lifecycle support.
Supply support for LT8609EMSE#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 industrial, automotive, communications, and healthcare markets.
The LT8609 series belongs to Analog Devices' Power by Linear™ portfolio, designed specifically for high-efficiency, low-EMI, wide-input DC/DC conversion in space-constrained and noise-sensitive applications.
FAQ
What is the maximum input voltage rating for the LT8609EMSE#PBF?
The LT8609EMSE#PBF has an absolute maximum input voltage rating of 42V on the VIN and EN/UV pins. Operation is specified from 3.0V to 42V, making it suitable for 24V and 36V industrial rails as well as 12V automotive systems with load dump tolerance. Exceeding 42V may cause permanent damage per Absolute Maximum Ratings.
Does the LT8609EMSE#PBF support synchronization to an external clock?
Yes, the LT8609EMSE#PBF supports external clock synchronization via its SYNC pin. When driven with a TTL/CMOS-compatible clock between 200kHz and 2.2MHz, the device aligns its switching edges to the external source and operates in pulse-skipping mode. This feature enables deterministic EMI reduction and multi-rail phase interleaving in complex power systems.
What is the purpose of the TR/SS pin on the LT8609EMSE#PBF?
The TR/SS pin on the LT8609EMSE#PBF serves dual functions: soft-start control and output voltage tracking. An external capacitor connected to TR/SS sets the output voltage ramp rate during startup, preventing inrush current. In tracking mode, it allows coordinated power-up with other rails by scaling the output voltage proportionally (e.g., 3.3V output tracks TR/SS ×4.2).
How does the PG (Power Good) flag behave on the LT8609EMSE#PBF?
The PG pin on the LT8609EMSE#PBF is an open-drain output that goes high-Z when the FB voltage is within ±8.5% of 0.782V and no fault conditions exist. It remains valid as long as VIN exceeds 3.2V-even if EN/UV is inactive-enabling robust system sequencing and fault detection independent of enable state.
Is the LT8609EMSE#PBF qualified for automotive applications?
Yes, the LT8609EMSE#PBF is rated for –40°C to 125°C junction temperature and is AEC-Q100 qualified for automotive applications. Its MSE package with side-wettable flanks supports automated optical inspection (AOI), and its integrated features-including spread-spectrum modulation and robust UVLO-meet stringent automotive EMI and reliability requirements.
LT8609EMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT8609EMSE#PBF FAQ
1.How can I place an order for LT8609EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609EMSE#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 LT8609EMSE#PBF reliable?
The price and inventory of LT8609EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8609EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609EMSE#PBF?
LT8609EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609EMSE#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 LT8609EMSE#PBF?
For technical support, including LT8609EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609EMSE#PBF requirements.
6.How does Aetrix verify that LT8609EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8609EMSE#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 LT8609EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8609EMSE#PBF?
All LT8609EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609EMSE#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 LT8609EMSE#PBF part is unused and in its original packaging.
Return procedure for LT8609EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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