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Analog Devices Inc. LT8609BEMSE#PBF
- Part No.:
- LT8609BEMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609BEMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:452
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Product details
Overview
LT8609BEMSE#PBF from Analog Devices is a 42V, 3A synchronous step-down regulator operating in pulse-skipping mode only, with 2.5µA quiescent current at 12VIN→3.3VOUT, 45ns minimum on-time, and internal compensation for fast transient response. It delivers stable 5V or adjustable output in automotive and industrial power supplies requiring low EMI and wide input range.
For engineers reviewing the LT8609BEMSE#PBF datasheet, LT8609BEMSE#PBF pinout, LT8609BEMSE#PBF application, or LT8609BEMSE#PBF equivalent, this page provides verified package mapping (10-lead MSOP), confirmed pulse-skipping-only operation, validated 0.772–0.792V feedback reference, exact PG threshold (±8.5% on FB), and real-world efficiency curves at 2MHz switching.
Technical Context
The LT8609BEMSE#PBF implements peak current mode control with internal 0.782V reference and fixed-frequency oscillator set via RT resistor (1.875–2.125MHz typical). Unlike LT8609/LT8609A, it omits the SYNC pin and operates exclusively in pulse-skipping mode-no Burst Mode or spread spectrum modulation.
Its EN/UV pin features 1.05V rising threshold with 50mV hysteresis, enabling precise input UVLO programming; TR/SS pin supports soft-start and tracking via 2µA internal pull-up; PG flag asserts low when FB deviates >±8.5% from regulation or during fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports 12V/24V automotive rails and industrial 36V systems without external pre-regulation. |
| Quiescent Current | 350µA (typ) at VIN=2V, non-switching - enables always-on battery-powered applications with multi-year standby life. |
| Output Current | 3A continuous - sustains full load at 125°C junction temperature with proper PCB thermal design. |
| Switching Frequency | 2.00MHz (typ) with RT=18.2kΩ - allows use of compact 2.2µH inductors and fits within CISPR 25 Class 5 EMI limits. |
| Feedback Reference | 0.772–0.792V (min/max over temp) - sets output voltage accuracy for adjustable designs using external resistor divider. |
| Minimum On-Time | 45ns - enables high step-down ratios (e.g., 42V→3.3V at 2MHz) without pulse skipping at light loads. |
| PG Threshold Accuracy | ±8.5% on FB pin - provides reliable power-good signaling for FPGA/CPU sequencing with known tolerance margin. |
Pinout & Package
LT8609BEMSE#PBF uses a 10-lead plastic MSOP package (MSE) with exposed pad (Pin 11 = GND), θJA = 40°C/W. The exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply for high-side NMOS gate drive | Requires 0.1µF ceramic capacitor to SW; no series resistor allowed - critical for 100% duty cycle capability. |
| SW | Switch node connecting internal top/bottom FETs to inductor | High di/dt node; must be minimized in layout to reduce EMI and switching losses. |
| INTVCC | Internal 3.5V regulator output | Bypass with ≥1µF low-ESR ceramic; not for external loading - powers gate drivers and control logic. |
| RT | Oscillator frequency setting input | Resistor to GND sets fSW; 18.2kΩ yields 2.00MHz - determines inductor size and EMI profile. |
| EN/UV | Enable and input undervoltage lockout input | 1.05V rising threshold with 50mV hysteresis - enables programmable VIN cutoff or remote shutdown. |
| VIN | Main power input for IC core and high-side switch | Must be locally bypassed with low-ESR capacitor; connects directly to input bulk cap positive terminal. |
| PG | Open-drain power-good flag | Pulls low if FB outside ±8.5% or fault occurs; valid above 3.2V VIN - used for system power sequencing. |
| TR/SS | Soft-start and output tracking control | 2µA internal pull-up enables RC-programmed ramp rate; pulled low during fault - prevents inrush current. |
| FB | Feedback input for adjustable output regulation | Regulated to 0.782V (typ); connects to resistor divider - defines VOUT = 0.782V × (1 + R1/R2). |
| GND | Power and signal ground reference | Exposed pad (Pin 11) is GND - must be soldered to PCB thermal pad for θJA = 40°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Pulse-skipping-only operation | Eliminates Burst Mode artifacts; ensures deterministic timing for noise-sensitive analog circuits. |
| 45ns minimum on-time | Enables direct 42V-to-3.3V conversion at 2MHz without external LDO post-regulation. |
| Internal compensation | Reduces BOM count by removing external compensation network - simplifies layout and validation. |
| 0.782V precision reference | Supports ±1.5% output accuracy over line/load/temp - meets tight tolerance requirements for MCU cores. |
| PG flag with ±8.5% threshold | Provides unambiguous power-good assertion for FPGA configuration and processor reset coordination. |
| AEC-Q100 qualified (Grade E) | Rated for –40°C to +125°C junction temperature - suitable for under-hood automotive modules. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering DSP, audio codec, and display interface in head unit with 12V battery input subject to cold-crank dips. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck converter delivering 3A continuous with ultralow IQ to maintain RTC and CAN wake-up during sleep. Use Value: 350µA non-switching IQ extends battery backup time; 42V input withstands load-dump transients up to ISO 7637-2 Pulse 5a. |
Use Scenario: Generating isolated 5V rail for digital I/O isolation barriers and fieldbus transceivers in modular PLC backplane. IC Role / Device Role / Timing Role: High-efficiency intermediate converter feeding downstream isolated DC-DC modules from 24V industrial bus. Use Value: 2MHz switching enables small 2.2µH inductor; internal compensation reduces layout sensitivity across production batches. |
| Medical Portable Monitor | Test & Measurement Equipment |
|
Use Scenario: Battery-powered patient monitor requiring quiet 3.3V supply for ADC front-end and touch controller with minimal ripple. IC Role / Device Role / Timing Role: Low-noise, low-EMI buck regulator operating in pulse-skipping mode to avoid interference with sensitive analog acquisition. Use Value: No spread-spectrum jitter; clean 2MHz fundamental allows filtering with small LC; ±8.5% PG ensures reliable boot sequencing. |
Use Scenario: Rack-mounted oscilloscope module needing stable 5V for FPGA and high-speed DACs with fast transient response. IC Role / Device Role / Timing Role: Point-of-load regulator responding to dynamic current steps from digital logic switching. Use Value: 45ns min-on-time and peak current mode enable <10µs recovery from 50%–100% load steps; internal compensation ensures stability across temperature. |
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 |
|---|---|---|---|
| LT8609EMSE#PBF | Includes SYNC pin for Burst Mode or spread spectrum; 1.7µA IQ vs 350µA; same 45ns min-on-time and package. | Preferred where lowest IQ (<2.5µA) is mandatory for battery longevity; requires external clock or pull-down for Burst Mode. | Select LT8609EMSE#PBF if ultralow IQ dominates; LT8609BEMSE#PBF if deterministic pulse-skipping timing is required. |
| LT8609AIMSE#PBF | Same pinout and pulse-skipping operation; rated for –40°C to +125°C (I-grade) with tighter FB tolerance (0.770–0.786V). | Suitable for extended-temp industrial environments; identical functional behavior but higher test grade. | Choose LT8609AIMSE#PBF for enhanced parametric consistency across temperature; LT8609BEMSE#PBF for standard commercial-grade cost optimization. |
Compared with LT8609EMSE#PBF, LT8609BEMSE#PBF trades 350× higher light-load IQ for guaranteed pulse-skipping determinism and eliminates SYNC pin routing complexity; versus LT8609AIMSE#PBF, it offers identical functionality at lower test-grade cost without sacrificing thermal or electrical performance in standard environments.
Availability
LT8609BEMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLC I/O, medical portable monitors, and test equipment requiring stable component supply with AEC-Q100 qualification and 2.5µA quiescent current performance.
Supply support for LT8609BEMSE#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 since 1965.
The LT8609BEMSE#PBF belongs to the LT8609 family of high-efficiency, high-voltage synchronous monolithic buck regulators designed for automotive and industrial applications demanding ultralow IQ, wide input range, and robust EMI performance.
FAQ
What is the key functional difference between LT8609BEMSE#PBF and LT8609EMSE#PBF?
The LT8609BEMSE#PBF operates exclusively in pulse-skipping mode and lacks the SYNC pin, while the LT8609EMSE#PBF supports Burst Mode (with <2.5µA IQ), spread spectrum, and external synchronization via its SYNC pin. This makes LT8609BEMSE#PBF ideal for deterministic timing-critical applications where Burst Mode's variable frequency is undesirable, whereas LT8609EMSE#PBF suits ultra-low-power battery systems.
Does LT8609BEMSE#PBF support adjustable output voltage?
Yes, LT8609BEMSE#PBF supports adjustable output voltage via the FB pin, which is regulated to 0.782V (typ). An external resistor divider connected between VOUT, FB, and GND sets the output voltage as VOUT = 0.782V × (1 + R1/R2). Fixed-output variants (e.g., LT8609A-3.3) are separate part numbers - LT8609BEMSE#PBF itself is adjustable-only.
What is the maximum junction temperature rating for LT8609BEMSE#PBF?
The LT8609BEMSE#PBF is specified for operation from –40°C to +125°C junction temperature (E-grade). Its absolute maximum junction temperature is 150°C, and overtemperature protection activates above this threshold. Thermal design must ensure θJA = 40°C/W is achieved via proper exposed-pad soldering and PCB copper area.
Can LT8609BEMSE#PBF be used in automotive applications?
Yes, LT8609BEMSE#PBF is AEC-Q100 qualified (Grade E) and rated for –40°C to +125°C operation, making it suitable for automotive infotainment, body control modules, and ADAS subsystems. It withstands 42V load-dump transients and meets stringent automotive reliability and qualification requirements per the official Analog Devices automotive product documentation.
What is the purpose of the TR/SS pin on LT8609BEMSE#PBF?
The TR/SS pin on LT8609BEMSE#PBF provides soft-start and output voltage tracking functionality. With a capacitor to ground, it programs the output voltage ramp rate during startup to limit inrush current. When driven externally, it allows the output to track another supply rail - for example, coordinating power-up sequences between multiple rails in FPGA or processor systems. An internal 2µA pull-up current enables simple RC timing.
LT8609BEMSE#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
LT8609BEMSE#PBF FAQ
1.How can I place an order for LT8609BEMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609BEMSE#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 LT8609BEMSE#PBF reliable?
The price and inventory of LT8609BEMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609BEMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8609BEMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609BEMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609BEMSE#PBF?
LT8609BEMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609BEMSE#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 LT8609BEMSE#PBF?
For technical support, including LT8609BEMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609BEMSE#PBF requirements.
6.How does Aetrix verify that LT8609BEMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8609BEMSE#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 LT8609BEMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8609BEMSE#PBF?
All LT8609BEMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609BEMSE#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 LT8609BEMSE#PBF part is unused and in its original packaging.
Return procedure for LT8609BEMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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