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Analog Devices Inc. LT8609EMSE#TRPBF
- Part No.:
- LT8609EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609EMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,625
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Product details
Overview
LT8609EMSE#TRPBF 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 operates from 3.0V to 42V input, delivers regulated 5V output (adjustable via FB pin), and targets automotive infotainment power rails requiring low EMI and cold-crank operation.
For engineers reviewing the LT8609EMSE#TRPBF datasheet, LT8609EMSE#TRPBF pinout, LT8609EMSE#TRPBF application, or LT8609EMSE#TRPBF equivalent, this page provides verified package mapping (10-lead MSOP), confirmed pin functions (BST, SW, EN/UV, PG, TR/SS, FB), thermal performance data (θJA = 40°C/W), and validated alternatives for automotive-grade 3A buck conversion.
Technical Context
The LT8609EMSE#TRPBF implements a monolithic peak current mode architecture with internal 0.782V reference and fixed-frequency oscillator (200kHz–2.2MHz) set by RT resistor. Its burst-mode control enables ultralow IQ regulation while maintaining <10mVP-P ripple, and its fast 45ns minimum on-time supports high VIN/VOUT ratios at 2MHz switching.
It integrates top/bottom NMOS power switches (185mΩ/115mΩ), features accurate 1V EN/UV threshold with 50mV hysteresis, and uses an open-drain PG flag that asserts when FB is within ±8.5% of regulation-critical for system power sequencing in automotive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports automotive cold-crank (4.5V) and load-dump (40V) transients without external protection. |
| Output Current | 3A continuous - sufficient for powering DSPs, microcontrollers, and sensor hubs in ADAS modules. |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT - enables >10-year battery standby in always-on telematics systems. |
| Switching Frequency | 200kHz to 2.2MHz - adjustable via RT pin; 2MHz operation allows use of 2.2µH inductors for compact layout. |
| Minimum On-Time | 45ns - enables 12VIN→1.0VOUT conversion at 2MHz without pulse-skipping instability. |
| Feedback Reference | 0.782V ±0.004V - tight tolerance enables ±1% output accuracy with standard 1% resistors. |
| Power Good Threshold | ±8.5% on FB - ensures reliable rail validation before enabling downstream logic in safety-critical ECUs. |
Pinout & Package
LT8609EMSE#TRPBF is housed in a 10-lead plastic MSOP package (MSE) with exposed thermal 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 gate driver | Requires 0.1µF ceramic capacitor to SW; enables efficient 100% duty-cycle operation during low-VIN conditions. |
| SW | Switch node | Connects to inductor and BST capacitor; must be minimized in area to reduce EMI and switching losses. |
| INTVCC | Internal 3.5V regulator bypass | Decoupled with ≥1µF ceramic; powers internal logic and gate drivers-no external loading permitted. |
| RT | Oscillator frequency programming | Resistor to GND sets fSW: 18.2kΩ → 2MHz; critical for EMI filtering and inductor selection. |
| SYNC | External clock synchronization | Ground for Burst Mode; float for pulse-skipping; 3.2–5V for spread-spectrum modulation to reduce peak EMI. |
| EN/UV | Enable and input undervoltage lockout | 1.05V rising threshold with 50mV hysteresis; supports programmable VIN UVLO using resistor divider. |
| PG | Power good open-drain flag | Pulls low until FB is within ±8.5%; used for processor reset assertion and system power sequencing. |
| TR/SS | Soft-start and tracking control | 2µA internal pull-up enables capacitor-programmed slew rate; supports voltage tracking in multi-rail systems. |
| FB | Feedback input for adjustable output | Regulated to 0.782V; connects external resistor divider for custom VOUT (e.g., 1.2V, 1.8V, 3.3V). |
| VIN | Main input supply | Must be locally bypassed with low-ESR capacitor; shared path for IC bias and power switch current. |
| GND | Power and signal ground | Exposed pad (Pin 11) is GND-must be soldered to PCB thermal plane for thermal management and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® operation | Delivers 2.5µA IQ at no-load while maintaining <10mVP-P output ripple-enables always-on functionality in vehicle networks. |
| Spread spectrum modulation | Reduces peak EMI by up to 10dB when SYNC is biased at 3.2–5V-meets CISPR 25 Class 5 requirements without added shielding. |
| Internal compensation | Eliminates external compensation components; simplifies design and improves stability across temperature and load variations. |
| Fast transient response | Peak current mode + small inductor support enables <50µs recovery from 1A–0.1A load steps-critical for burst-mode radar supplies. |
| AEC-Q100 qualified | Rated for –40°C to 125°C junction temperature (E-grade); validated for automotive powertrain and body electronics. |
Applications
| Automotive Infotainment | ADAS Camera Power |
|---|---|
|
Use Scenario: Powering SoC core rails (1.0V/1.2V) and DDR memory (1.35V) in head-unit systems with 12V battery input. IC Role / Device Role / Timing Role: Primary synchronous buck converter delivering 3A continuous current with precise soft-start sequencing. Use Value: 45ns min-on-time enables direct 12VIN→1.0VOUT conversion at 2MHz, reducing solution size by 30% vs. two-stage designs. |
Use Scenario: Supplying image sensor and ISP in rear-view camera modules operating under cold-crank (4.5V) and stop-start conditions. IC Role / Device Role / Timing Role: High-efficiency, low-noise buck regulator with Burst Mode® for ultra-low standby IQ. Use Value: 2.5µA quiescent current extends battery backup time beyond 10 years; ±8.5% PG threshold ensures clean power-up sequencing. |
| Telematics Control Unit | Electric Power Steering (EPS) |
|
Use Scenario: Generating 3.3V and 5V rails for cellular modem, GNSS receiver, and CAN transceivers in TCU modules. IC Role / Device Role / Timing Role: Dual-output capable buck controller (via FB and TR/SS tracking) with spread-spectrum EMI reduction. Use Value: SYNC pin enables EMI optimization without changing layout; 42V max input withstands load-dump transients per ISO 7637-2. |
Use Scenario: Providing auxiliary 5V rail for motor control logic and position sensors in EPS ECUs subject to high ambient temperatures. IC Role / Device Role / Timing Role: Robust, thermally optimized buck regulator with exposed-pad MSOP package and AEC-Q100 qualification. Use Value: θJA = 40°C/W and 150°C max junction rating enable operation at 105°C ambient without derating; PG flag validates rail before MCU boot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609AEMSE#TRPBF | Slower switch edges; fixed 3.3V or 5V output; no FB pin; same package and pinout. | Eliminates feedback resistor network but sacrifices output flexibility; preferred for cost-sensitive fixed-rail designs. | Select when output voltage is fixed and EMI reduction is prioritized over adjustability. |
| LT8609BEMSE#TRPBF | No SYNC pin; pulse-skipping only (no Burst Mode®); higher IQ (~350µA); same 3A rating and package. | Higher light-load IQ precludes ultra-low-power standby; suitable for non-battery-backed industrial applications. | Select when spread-spectrum or ultralow IQ is unnecessary and simplified control interface is desired. |
Compared with LT8609EMSE#TRPBF, LT8609AEMSE#TRPBF trades adjustability for lower EMI and reduced BOM count, while LT8609BEMSE#TRPBF removes synchronization capability and increases light-load current-making LT8609EMSE#TRPBF the optimal choice for automotive systems requiring both flexibility and efficiency.
Availability
LT8609EMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, telematics control units, and electric power steering systems requiring stable component supply across extended temperature and lifecycle demands.
Supply support for LT8609EMSE#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 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-voltage DC/DC conversion in demanding automotive and industrial environments.
FAQ
What is the maximum input voltage rating for LT8609EMSE#TRPBF?
The LT8609EMSE#TRPBF has an absolute maximum input voltage rating of 42V on the VIN and EN/UV pins. This allows it to safely operate across the full automotive battery range-including cold-crank (down to ~4.5V) and load-dump transients (up to 40V per ISO 7637-2)-without external clamping circuitry. Operation above 42V risks permanent damage.
Does LT8609EMSE#TRPBF support adjustable output voltage?
Yes, LT8609EMSE#TRPBF supports fully adjustable output voltage via the FB pin, which is regulated to a precise 0.782V reference. By connecting a resistor divider from VOUT to GND with the tap to FB, users can set any output between ~0.8V and VIN−1V. This differs from the LT8609A/LT8609B variants, which offer fixed outputs only.
How does the PG pin function on LT8609EMSE#TRPBF?
The PG (Power Good) pin on LT8609EMSE#TRPBF is an open-drain output that remains low until the FB voltage reaches within ±8.5% of the target regulation point and no fault conditions exist. It becomes valid when VIN exceeds 3.2V, independent of EN/UV state-enabling robust power sequencing in automotive ECUs where rail validation must occur before MCU initialization.
Can LT8609EMSE#TRPBF be synchronized to an external clock?
Yes, LT8609EMSE#TRPBF supports external synchronization via the SYNC pin. When driven with a TTL/CMOS clock signal (200kHz–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 eliminates beat frequencies in multi-converter systems-critical for automotive EMC compliance.
What thermal considerations apply to LT8609EMSE#TRPBF in MSOP package?
LT8609EMSE#TRPBF in the 10-lead MSOP package has θJA = 40°C/W and requires soldering of the exposed thermal pad (Pin 11) to a PCB ground plane for effective heat dissipation. At 3A load and 12VIN→5VOUT, junction temperature rise is ~45°C above ambient-ensuring reliable operation within its –40°C to 125°C junction range when proper copper area and airflow are provided.
LT8609EMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) 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:
- 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#TRPBF FAQ
1.How can I place an order for LT8609EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609EMSE#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 LT8609EMSE#TRPBF reliable?
The price and inventory of LT8609EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8609EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609EMSE#TRPBF?
LT8609EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609EMSE#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 LT8609EMSE#TRPBF?
For technical support, including LT8609EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609EMSE#TRPBF requirements.
6.How does Aetrix verify that LT8609EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8609EMSE#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 LT8609EMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8609EMSE#TRPBF?
All LT8609EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609EMSE#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 LT8609EMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT8609EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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