My Inquiry
My Account
Analog Devices Inc. LT8609AJMSE#TRPBF
- Part No.:
- LT8609AJMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609AJMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,448
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8609AJMSE#TRPBF from Analog Devices is a 42V, 3A synchronous step-down regulator with 2.5µA quiescent current in Burst Mode, 45ns minimum on-time, and AEC-Q100 qualification for automotive applications. It operates from 3.0V to 42V input, delivers regulated 5V output (fixed), and supports spread-spectrum EMI reduction via SYNC pin.
For engineers reviewing the LT8609AJMSE#TRPBF datasheet, LT8609AJMSE#TRPBF pinout, LT8609AJMSE#TRPBF application, or LT8609AJMSE#TRPBF equivalent, key selection factors include its J-grade temperature range (–40°C to 150°C), 10-lead MSOP package with side-wettable flanks, fixed 5V output, and compatibility with low-EMI automotive power rails.
Technical Context
The LT8609AJMSE#TRPBF implements peak current mode control with internal compensation, enabling fast transient response and stable operation with small inductors. Its oscillator frequency is set by an external RT resistor and ranges from 200kHz to 2.2MHz - confirmed at 2.00MHz typical with RT = 18.2kΩ.
Burst Mode operation maintains <10mVP-P output ripple while achieving ultralow IQ of 2.5µA at light loads; pulse-skipping mode is enabled when SYNC is floating, and spread-spectrum modulation is activated when SYNC is tied to 3.2V–5.0V. The device integrates top/bottom NMOS switches with 185mΩ/115mΩ RDS(on), supporting 3A continuous output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports wide automotive battery transients including cold-crank and load-dump conditions. |
| Output Voltage | Fixed 5.00V ±7.5% - internally trimmed; no external feedback resistors required for basic 5V rail generation. |
| Continuous Output Current | 3A - sustained delivery without thermal derating up to 150°C junction temperature (J-grade). |
| Quiescent Current | 2.5µA at 12VIN → 5VOUT - enables always-on systems with multi-year battery life in automotive telematics. |
| Switching Frequency | 2.00MHz typical (RT = 18.2kΩ) - allows use of compact 2.2µH inductors and reduces EMI fundamental frequency above AM band. |
| Minimum On-Time | 45ns - enables high step-down ratios (e.g., 42V→5V) at 2MHz without pulse skipping or instability. |
| PG Accuracy | ±7.5% on VOUT - provides precise power-good assertion for microcontroller reset sequencing in automotive ECUs. |
Pinout & Package
LT8609AJMSE#TRPBF uses 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 for high-side NMOS gate drive | Requires 0.1µF ceramic capacitor to SW; enables efficient 42V operation with integrated high-side switch. |
| SW | Switch node | Connects to inductor and BST capacitor; must be minimized in layout to reduce EMI and switching losses. |
| INTVCC | Internal 3.5V regulator bypass | Decoupled with ≥1µF low-ESR ceramic; powers internal logic and gate drivers; not for external loading. |
| RT | Oscillator frequency programming | Resistor to GND sets fSW; 18.2kΩ yields 2.00MHz - critical for EMI compliance and inductor size optimization. |
| SYNC | External clock synchronization / spread-spectrum control | Ground for Burst Mode; float for pulse-skipping; 3.2–5.0V for spread-spectrum - directly controls EMI profile. |
| EN/UV | Enable and input undervoltage lockout | 1.05V rising threshold with 50mV hysteresis - programmable UVLO using resistor divider from VIN. |
| PG | Power-good open-drain flag | Asserts high when VOUT is within ±7.5%; drives MCU reset or system enable with external pull-up. |
| TR/SS | Soft-start and tracking control | 2µA internal current source charges external capacitor; sets output ramp rate during startup and enables voltage tracking. |
| VOUT | Fixed 5V output | Internally regulated to 5.00V; connects to 8.95MΩ internal divider - eliminates FB resistor network for simplified BOM. |
| GND | Power and signal ground | Exposed pad (Pin 11) must be soldered to PCB ground plane - essential for thermal performance and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +150°C junction operation - meets automotive reliability requirements for engine control and ADAS modules. |
| Ultralow 2.5µA quiescent current | Enables >10-year battery life in always-on vehicle subsystems (e.g., CAN wake-up receivers, GPS trackers) without compromising regulation. |
| Spread-spectrum frequency modulation | Reduces peak EMI by >10dB across 1–100MHz - simplifies compliance with CISPR 25 Class 5 in automotive infotainment and ADAS power supplies. |
| 45ns minimum on-time | Supports direct 42V-to-5V conversion at 2MHz - eliminates need for pre-regulator stages and saves board space in compact ECUs. |
| Integrated 5V fixed output | Removes external feedback resistors and associated tolerance errors - improves output accuracy and reduces component count in cost-sensitive designs. |
| Open-drain PG with ±7.5% accuracy | Provides deterministic power sequencing for downstream processors - ensures safe boot timing in automotive microcontrollers and SoCs. |
Applications
| Automotive Infotainment Power Supply | ADAS Camera Module Rail |
|---|---|
Use Scenario: Powering DSP, FPGA, and display interface ICs in head-unit systems requiring clean, low-noise 5V supply. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering 3A with burst-mode efficiency during standby and full-load capability during video processing. Use Value: 2.5µA IQ extends battery backup time; spread-spectrum operation meets CISPR 25 radiated emissions limits without added shielding. |
Use Scenario: Generating stable 5V rail for high-speed image sensors and SerDes links in rear-view and surround-view camera modules. IC Role / Device Role / Timing Role: Fixed-output synchronous buck regulator providing low-ripple 5V with fast transient response to sensor pixel clock demands. Use Value: 45ns min-on-time enables single-stage 12V/24V-to-5V conversion; AEC-Q100 qualification ensures reliability in under-hood thermal environments. |
| Telematics Control Unit (TCU) | Automotive Body Control Module (BCM) |
Use Scenario: Supplying 5V to cellular modem, GNSS receiver, and CAN transceivers in always-connected vehicle tracking units. IC Role / Device Role / Timing Role: Always-on power management IC with EN/UV programmable UVLO and PG signaling for safe MCU wake-up and shutdown sequencing. Use Value: 2.5µA IQ enables >5-year coin-cell backup life; J-grade temp range supports operation in trunk-mounted TCU enclosures. |
Use Scenario: Powering microcontrollers, LIN transceivers, and LED drivers in door modules and lighting control nodes. IC Role / Device Role / Timing Role: Compact, fixed-output buck regulator replacing discrete LDOs and older switching solutions to improve efficiency and thermal margin. Use Value: 10-lead MSOP with side-wettable flanks enables automated optical inspection (AOI); ±7.5% PG accuracy ensures robust reset behavior 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 |
|---|---|---|---|
| LT8609AIMSE#TRPBF | I-grade (–40°C to 125°C), same 5V fixed output, identical pinout and features | Not qualified for under-hood or high-temp ECU locations requiring 150°C operation | Select LT8609AJMSE#TRPBF when operating junction temperature exceeds 125°C or AEC-Q100 Grade 1 is mandated. |
| LT8609AEDDM#TRPBF | Same specs but in 10-lead 3mm×3mm DFN with side-wettable flanks; θJA = 45°C/W vs. 40°C/W for MSOP | Offers smaller footprint and improved thermal performance in space-constrained modules like camera ECU boards | Choose LT8609AEDDM#TRPBF for higher power density; select LT8609AJMSE#TRPBF when MSOP is preferred for legacy layout compatibility or AOI requirements. |
Compared with LT8609AIMSE#TRPBF, the LT8609AJMSE#TRPBF adds 25°C higher max junction temperature and full AEC-Q100 Grade 1 validation; versus LT8609AEDDM#TRPBF, it trades slightly lower thermal resistance for established MSOP assembly processes and larger pad geometry for enhanced reworkability.
Availability
LT8609AJMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, telematics control units, and body control modules requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT8609AJMSE#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 LT8609A product line delivers ultralow-IQ, high-voltage synchronous buck regulators optimized for automotive power systems where efficiency, EMI, and temperature resilience are critical design constraints.
FAQ
What is the maximum operating junction temperature for the LT8609AJMSE#TRPBF?
The LT8609AJMSE#TRPBF is rated for –40°C to +150°C junction temperature and is fully specified and guaranteed across this range. This J-grade rating satisfies AEC-Q100 Grade 1 requirements and supports under-hood automotive applications where ambient temperatures exceed 105°C. The exposed GND pad must be properly soldered to maintain thermal resistance below 40°C/W.
Does the LT8609AJMSE#TRPBF require external feedback resistors for its 5V output?
No, the LT8609AJMSE#TRPBF does not require external feedback resistors. It integrates an internal 8.95MΩ resistor divider that regulates the VOUT pin precisely to 5.00V ±7.5%. This fixed-output architecture eliminates external resistor tolerances and layout sensitivity, reducing BOM count and improving output accuracy over temperature and line regulation.
How does the SYNC pin function on the LT8609AJMSE#TRPBF?
On the LT8609AJMSE#TRPBF, the SYNC pin enables three distinct operating modes: grounding it activates low-ripple Burst Mode for ultralow IQ; leaving it floating selects pulse-skipping mode; applying 3.2V–5.0V enables spread-spectrum frequency modulation to reduce EMI peaks. Unlike the LT8609B variant, the LT8609AJMSE#TRPBF retains full SYNC functionality.
What is the purpose of the TR/SS pin on the LT8609AJMSE#TRPBF?
The TR/SS pin on the LT8609AJMSE#TRPBF provides soft-start control and output voltage tracking. An internal 2µA current source charges an external capacitor connected to this pin, setting the output voltage ramp rate during startup. In fixed-output variants like the LT8609AJMSE#TRPBF, it also enables tracking of the 5V output to an external reference voltage scaled by a factor of 6.39.
Is the LT8609AJMSE#TRPBF pin-compatible with other LT8609A variants in the same package?
Yes, the LT8609AJMSE#TRPBF is pin-compatible with all other LT8609A variants offered in the 10-lead MSOP (MSE) package, including LT8609AIMSE#TRPBF and LT8609AEMSE#TRPBF. All share identical pinout, electrical interface, and functional pin definitions - only temperature grade and minor specification tolerances differ.
LT8609AJMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LT8609AJMSE#TRPBF FAQ
1.How can I place an order for LT8609AJMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AJMSE#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 LT8609AJMSE#TRPBF reliable?
The price and inventory of LT8609AJMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AJMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8609AJMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AJMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AJMSE#TRPBF?
LT8609AJMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AJMSE#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 LT8609AJMSE#TRPBF?
For technical support, including LT8609AJMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AJMSE#TRPBF requirements.
6.How does Aetrix verify that LT8609AJMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8609AJMSE#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 LT8609AJMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8609AJMSE#TRPBF?
All LT8609AJMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AJMSE#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 LT8609AJMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT8609AJMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8609AJMSE#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
