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Analog Devices Inc. LT8609AEMSE16#TRPBF
- Part No.:
- LT8609AEMSE16#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609AEMSE16#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,408
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Product details
Overview
LT8609AEMSE16#TRPBF from Analog Devices is a 42V, 3A synchronous step-down regulator with 2.5µA quiescent current in Burst Mode, 2MHz switching frequency, fixed 5V output, and integrated power MOSFETs. It features spread spectrum modulation for low EMI, internal compensation, and ±7.5% power-good accuracy - deployed in automotive infotainment power rails requiring ultra-low standby consumption.
For engineers reviewing the LT8609AEMSE16#TRPBF datasheet, LT8609AEMSE16#TRPBF pinout, LT8609AEMSE16#TRPBF application, or LT8609AEMSE16#TRPBF equivalent, key selection criteria include its 16-lead MSOP package with exposed thermal pad, fixed 5V output (no external feedback required), 45ns minimum on-time, and AEC-Q100 qualification for automotive-grade reliability under 125°C junction temperature.
Technical Context
The LT8609AEMSE16#TRPBF implements peak current mode control with internal compensation, enabling fast transient response and stable operation with small inductors (e.g., 2.2µH). Its oscillator frequency is set via external RT resistor (18.2kΩ yields 2MHz) and supports synchronization or spread spectrum modulation via the SYNC pin.
It integrates top and bottom NMOS power switches (185mΩ/115mΩ RDS(on)), uses an internal 0.782V reference for adjustable variants but delivers fixed 5V via internal 8.95MΩ feedback divider, and employs a dedicated VOUT pin instead of FB for regulation - confirmed by pin configuration and electrical characteristics tables.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% over load/temperature - eliminates external feedback resistors and simplifies layout. |
| Max Continuous Output Current | 3A - supports high-current subsystems like display backlight drivers or MCU core rails without external boost. |
| Input Voltage Range | 3.0V to 42V - accommodates automotive battery transients (cold crank, load dump) without external pre-regulation. |
| Quiescent Current | 2.5µA at 12VIN→5VOUT in Burst Mode - enables >1-year battery life in always-on vehicle modules. |
| Switching Frequency | Adjustable 200kHz–2.2MHz (2MHz typical with 18.2kΩ RT) - allows optimization of size vs. efficiency and EMI filtering requirements. |
| Output Ripple | <10mVP-P in Burst Mode - meets noise-sensitive analog supply requirements without additional LDO post-regulation. |
| Minimum On-Time | 45ns - enables high step-down ratios (e.g., 42V→5V at 2MHz) without pulse-skipping instability. |
Pinout & Package
LT8609AEMSE16#TRPBF uses a 16-lead plastic MSOP package with exposed thermal pad (Pin 17 = GND), θJA = 40°C/W, θJC(PAD) = 10°C/W. The exposed pad must be soldered to PCB 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; critical for reliable top-FET turn-on above input voltage. |
| SW | Switch node | Connects to inductor and BST capacitor; high di/dt node requiring minimized PCB loop area. |
| INTVCC | Internal 3.5V regulator bypass | Must be decoupled with ≥1µF low-ESR ceramic; powers gate drivers and control logic. |
| RT | Oscillator frequency setting | Resistor to GND sets fSW; 18.2kΩ yields 2MHz - determines inductor size and EMI profile. |
| SYNC | External clock/spectrum control | Ground for Burst Mode; float for pulse-skipping; 3.2–5V for spread spectrum - directly controls EMI behavior. |
| EN/UV | Enable and input undervoltage lockout | 1.05V rising threshold; hysteresis 50mV - enables programmable VIN UVLO using external resistor divider. |
| PG | Power-good flag | Open-drain output active when VOUT is within ±7.5% of 5V and no fault - used for system sequencing. |
| TR/SS | Soft-start and tracking control | 2µA internal pull-up enables capacitor-programmed ramp rate; supports voltage tracking in multi-rail systems. |
| VIN | Main input supply | Supplies IC bias and top-FET; requires local high-frequency bypass (e.g., 1µF X7R + 10µF tantalum). |
| VOUT | Regulated 5V output | Fixed 5V output pin with internal 8.95MΩ divider - no FB connection needed; connects to output capacitor. |
| GND | Power and signal ground | Exposed pad (Pin 17) must be soldered to PCB ground plane for thermal dissipation and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 2.5µA input current at no load enables >10-year battery backup in telematics modules. |
| Spread Spectrum Modulation | 1–6kHz frequency dithering reduces peak EMI by >10dB, easing CISPR 25 Class 5 compliance. |
| Fixed 5V Output Architecture | Eliminates external feedback network, reducing BOM count and layout sensitivity to parasitic capacitance. |
| AEC-Q100 Qualified | Rated for –40°C to +125°C junction temperature - validated for engine bay and ADAS ECU deployments. |
| 45ns Minimum On-Time | Supports direct 42V→5V conversion at 2MHz, avoiding cascaded regulation and improving system efficiency. |
Applications
| Automotive Infotainment Power | Industrial Sensor Hub Supply |
|---|---|
|
Use Scenario: Powering LCD display controller, audio codec, and USB PHY in head-unit systems with 12V/24V battery input. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering 3A continuous current with <10mVP-P ripple to minimize display noise and audio distortion. Use Value: 2.5µA quiescent current extends battery runtime during vehicle sleep mode; AEC-Q100 rating ensures reliability across thermal cycles. |
Use Scenario: Providing stable 5V rail to MEMS accelerometers, pressure sensors, and low-power microcontrollers in factory automation nodes. IC Role / Device Role / Timing Role: High-efficiency DC/DC regulator operating from wide-input industrial 18–36V supplies, supporting remote battery or PoE-powered deployment. Use Value: 42V max input withstands 36V PoE+ surges; 2MHz switching enables compact 2.2µH inductor and <1000mm² total solution size. |
| Telematics Control Unit (TCU) | ADAS Camera Module Power |
|
Use Scenario: Supplying 5V to LTE modem, GNSS receiver, and CAN transceiver in always-connected vehicle communication units. IC Role / Device Role / Timing Role: Always-on power stage with precise PG signaling for safe boot sequencing and brown-out detection. Use Value: ±7.5% PG accuracy ensures deterministic system reset timing; spread spectrum reduces RF interference with cellular/GNSS antennas. |
Use Scenario: Generating clean 5V for image sensor interface and ISP in rear-view or surround-view camera ECUs. IC Role / Device Role / Timing Role: Low-noise, low-ripple power source where EMI-induced pixel noise or timing jitter must be minimized. Use Value: Burst Mode maintains <10mVP-P ripple at µA loads; 45ns min-on-time enables single-stage 12V→5V conversion without efficiency penalty. |
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#TRPBF | 10-lead MSOP, same 5V fixed output, identical electrical specs, but smaller thermal pad and higher θJA (40°C/W vs. 40°C/W - same value, but 16-lead offers larger copper area). | Limited thermal margin at full 3A in high ambient; less suitable for sealed enclosures or high-power density layouts. | Select LT8609AEMSE16#TRPBF when board space permits and thermal performance at 3A continuous load is critical. |
| LT8609AIMSE16#TRPBF | Same 16-lead MSOP package and 5V output, but rated for –40°C to 125°C (same as E-grade); differs only in screening/test flow - no functional difference. | No functional distinction; I-grade denotes enhanced test coverage for industrial use cases, not extended temperature range. | Choose LT8609AIMSE16#TRPBF if procurement requires industrial-grade traceability or extended reliability reporting. |
Compared with LT8609AEMSE#TRPBF, the LT8609AEMSE16#TRPBF provides superior thermal management via its larger exposed pad and optimized copper land pattern, while LT8609AIMSE16#TRPBF adds industrial test rigor without altering electrical behavior - both retain identical 5V regulation, 2.5µA IQ, and spread spectrum capability.
Availability
LT8609AEMSE16#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor hubs, and ADAS camera modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8609AEMSE16#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 precision, industrial, automotive, and communications markets.
The LT8609A series belongs to Analog Devices' Power by Linear™ portfolio of high-efficiency, low-EMI monolithic DC/DC regulators designed specifically for automotive and industrial applications demanding ultralow quiescent current and robust transient performance.
FAQ
What is the output voltage tolerance of the LT8609AEMSE16#TRPBF under full load and temperature?
The LT8609AEMSE16#TRPBF delivers a fixed 5V output with ±2% tolerance over full load (0–3A) and temperature (–40°C to +125°C junction), as specified in the Electrical Characteristics table for LT8609A-5 variants. This includes line regulation of ±0.02%/V and load regulation better than ±0.1% across its operating range, ensuring stable MCU and peripheral operation without external trimming.
Does the LT8609AEMSE16#TRPBF require an external feedback resistor network?
No, the LT8609AEMSE16#TRPBF does not require an external feedback resistor network. It is a fixed 5V output variant that uses an internal 8.95MΩ resistor divider connected to the VOUT pin, eliminating the need for external FB resistors and associated layout sensitivity - confirmed by the Pin Functions section and ORDER INFORMATION table identifying it as LT8609AEMSE16#TRPBF (not adjustable).
How is EMI reduced in the LT8609AEMSE16#TRPBF?
The LT8609AEMSE16#TRPBF reduces EMI through three integrated methods: (1) spread spectrum frequency modulation (1–6kHz dithering) enabled by applying 3.2–5V to SYNC; (2) slower switch edges versus LT8609/LT8609B (per Switch Edge Speed table); and (3) ultralow 10mVP-P output ripple in Burst Mode - all verified in Typical Performance Characteristics and Applications Information sections.
What thermal considerations apply to the LT8609AEMSE16#TRPBF's exposed pad?
The LT8609AEMSE16#TRPBF's exposed pad (Pin 17) is GND and must be soldered to a thermally robust PCB copper area. With θJC(PAD) = 10°C/W and θJA = 40°C/W, proper pad soldering and ≥4 thermal vias to inner ground planes are essential to maintain ≤125°C junction temperature at 3A continuous load - as specified in the Absolute Maximum Ratings and Package Description tables.
Can the LT8609AEMSE16#TRPBF be synchronized to an external clock?
Yes, the LT8609AEMSE16#TRPBF can be synchronized to an external clock via the SYNC pin. When driven with a TTL/CMOS-compatible signal between 200kHz and 2.2MHz, the device aligns its switching edges to the external clock while operating in pulse-skipping mode - per Pin Functions and OPERATION sections. Grounding SYNC enables Burst Mode; floating enables basic pulse-skipping.
LT8609AEMSE16#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (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:
- 16-MSOP-EP
LT8609AEMSE16#TRPBF FAQ
1.How can I place an order for LT8609AEMSE16#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AEMSE16#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 LT8609AEMSE16#TRPBF reliable?
The price and inventory of LT8609AEMSE16#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AEMSE16#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8609AEMSE16#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AEMSE16#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AEMSE16#TRPBF?
LT8609AEMSE16#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AEMSE16#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 LT8609AEMSE16#TRPBF?
For technical support, including LT8609AEMSE16#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AEMSE16#TRPBF requirements.
6.How does Aetrix verify that LT8609AEMSE16#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8609AEMSE16#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 LT8609AEMSE16#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8609AEMSE16#TRPBF?
All LT8609AEMSE16#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AEMSE16#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 LT8609AEMSE16#TRPBF part is unused and in its original packaging.
Return procedure for LT8609AEMSE16#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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