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Analog Devices Inc. LT8609AJMSE16#TRPBF
- Part No.:
- LT8609AJMSE16#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609AJMSE16#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,455
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Product details
Overview
LT8609AJMSE16#TRPBF from Analog Devices is a 42V, 3A synchronous step-down regulator with 2.5µA quiescent current in Burst Mode, peak current mode control, internal compensation, and 16-lead MSOP package rated for –40°C to 150°C junction temperature. It delivers regulated 5V output (fixed), supports spread-spectrum EMI reduction, and targets automotive power systems requiring low-noise, high-efficiency DC/DC conversion.
For engineers reviewing the LT8609AJMSE16#TRPBF datasheet, LT8609AJMSE16#TRPBF pinout, LT8609AJMSE16#TRPBF application, or LT8609AJMSE16#TRPBF equivalent, this page provides verified pin functions, thermal performance data, fixed-output regulation accuracy, SYNC-controlled EMI mitigation, and validated automotive-grade alternatives for AEC-Q100-compliant designs.
Technical Context
The LT8609AJMSE16#TRPBF implements peak current mode control with internal 0.782V reference and fixed 5V output via integrated feedback divider (8.95MΩ). Its oscillator frequency is set by external RT resistor (18.2kΩ typical for 2MHz) and supports synchronization or spread-spectrum modulation via SYNC pin to reduce EMI emissions.
It features fast 45ns minimum on-time, 90ns minimum off-time, and thermal shutdown protection. The device operates in pulse-skipping mode when SYNC is floating, and enters Burst Mode only when SYNC is grounded - enabling <2.5µA IQ at light loads while maintaining <10mVP-P ripple.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.00V ±7.5% (guaranteed over –40°C to 150°C) |
| Max Continuous Output Current | 3A - supports automotive infotainment, ADAS sensors, and body control modules without external current boosting |
| Input Voltage Range | 3.0V to 42V - accommodates cold-crank (4.5V) and load-dump (40V) transients in 12V/24V automotive systems |
| Quiescent Current (Burst Mode) | 2.5µA at 12VIN→5VOUT no-load - enables always-on subsystems with multi-year battery life |
| Switching Frequency | 2.00MHz (typical, RT = 18.2kΩ) - allows use of compact 2.2µH inductors and reduces EMI fundamental frequency |
| Feedback Reference Accuracy | 0.778V to 0.786V (J-grade, –40°C to 150°C) - ensures stable regulation across full automotive temperature range |
| PG Threshold Tolerance | ±7.5% on VOUT - provides precise power-good assertion for microcontroller reset sequencing |
Pinout & Package
LT8609AJMSE16#TRPBF uses a 16-lead plastic MSOP package with exposed thermal pad (Pin 17 = GND), θJA = 40°C/W, θJC(PAD) = 10°C/W. 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; enables efficient 42V operation with low RDS(on) |
| SW | Switch node | Connects to inductor and BST capacitor; critical for EMI layout - must minimize loop area |
| INTVCC | Internal 3.5V regulator bypass | Decoupled with ≥1µF low-ESR ceramic; powers internal logic and drivers - not for external loading |
| RT | Oscillator frequency programming | Resistor to GND sets fSW (200kHz–2.2MHz); 18.2kΩ yields 2MHz for compact magnetics |
| SYNC | External clock sync / spread-spectrum enable | Ground = Burst Mode; float = pulse-skipping; 3.2–5V = spread-spectrum - no connection on LT8609B |
| EN/UV | Enable and input undervoltage lockout | 1.05V rising threshold with 50mV hysteresis - programmable UVLO using resistor divider from VIN |
| VIN | Main input power supply | Bypassed locally with low-ESR capacitor; feeds internal circuitry and top switch - requires tight layout to GND |
| PG | Power-good open-drain flag | Pulled low until VOUT within ±7.5%; valid above 3.2V VIN - used for MCU reset or system sequencing |
| TR/SS | Soft-start and tracking control | 2µA internal pull-up; capacitor sets ramp rate; enables voltage tracking during startup or sequencing |
| VOUT | Fixed 5V regulated output | Internally connected to 8.95MΩ feedback divider - no external resistors required for 5V operation |
| GND | Power and signal ground | Exposed pad (Pin 17) must be soldered to PCB ground plane for thermal dissipation and noise control |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified (Grade 1, –40°C to 150°C) | Validated for automotive under-hood applications including engine control units and ADAS domain controllers |
| Spread-spectrum frequency modulation | Reduces peak EMI by >10dB across 1–10MHz band when SYNC tied to 3.3V - meets CISPR 25 Class 5 |
| Ultralow 2.5µA quiescent current | Enables >10-year battery standby in always-on telematics modules without compromising start-up time or regulation |
| 45ns minimum on-time | Supports high step-down ratios (e.g., 42V→5V at 2MHz) without pulse skipping - maintains regulation at light loads |
| Internal 5V feedback divider (8.95MΩ) | Eliminates external resistor network - improves accuracy, reduces BOM count, and enhances long-term stability |
| Open-drain PG with ±7.5% window | Provides precise, temperature-stable power-good signaling for safety-critical microcontrollers and ASIL-B systems |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powering SoC, display driver, and audio codec in head-unit with 12V battery input subject to cold-crank and load-dump events. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering 3A continuous current with ultralow IQ for always-on CAN wake-up functionality. Use Value: Maintains 5V rail during 4.5V cold-crank; achieves <10mVP-P ripple at 2MHz switching to avoid AM band interference. |
Use Scenario: Providing clean, low-noise 5V supply to CMOS image sensor and ISP in rear-view camera module mounted near exhaust. IC Role / Device Role / Timing Role: Fixed-output buck converter operating at 150°C junction temperature with spread-spectrum EMI suppression. Use Value: Enables compliance with CISPR 25 Class 5 radiated emissions limits while sustaining 3A load at 125°C ambient. |
| Body Control Module (BCM) | Telematics Control Unit (TCU) |
Use Scenario: Regulating 5V for microcontroller, LIN transceivers, and LED drivers in door module with intermittent 12V supply. IC Role / Device Role / Timing Role: High-efficiency synchronous buck with Burst Mode for sub-100µA sleep current and fast wake-up response. Use Value: Achieves 2.5µA IQ in regulation - extends vehicle battery life during extended parking periods. |
Use Scenario: Powering LTE modem, GNSS receiver, and secure element in cellular-connected TCU with GPS antenna nearby. IC Role / Device Role / Timing Role: Low-EMI 5V regulator with SYNC-controlled spread spectrum to prevent RF desense of GNSS front-end. Use Value: Reduces 1.5–2.5GHz harmonic coupling into GPS L1 band by shifting energy away from sensitive frequencies. |
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 |
|---|---|---|---|
| LT8609AIMSE16#TRPBF | Junction temperature range limited to –40°C to 125°C; identical electrical specs and pinout | Not qualified for under-hood applications exceeding 125°C ambient (e.g., engine bay, transmission control) | Select when operating environment stays below 125°C junction - lower cost, same footprint and design reuse |
| LT8609AHMSE16#TRPBF | Same –40°C to 150°C rating but specified for H-grade (not J-grade); tighter FB reference tolerance (0.770–0.794V vs. 0.766–0.798V) | Preferred for high-precision 5V rails where output accuracy impacts ADC reference or sensor biasing | Choose for applications demanding highest VREF stability across temperature - same thermal and EMI performance |
Compared with LT8609AIMSE16#TRPBF, the LT8609AJMSE16#TRPBF adds 25°C higher max junction temperature for under-hood reliability; versus LT8609AHMSE16#TRPBF, it trades minor VREF tolerance margin for optimized cost in volume automotive production.
Availability
LT8609AJMSE16#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, body control units, and telematics control units requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LT8609AJMSE16#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 automotive, industrial, communications, and healthcare markets.
The LT8609 family is designed specifically for automotive power systems requiring ultralow IQ, wide VIN range, AEC-Q100 qualification, and low-EMI operation - targeting next-generation E/E architectures with centralized domain controllers.
FAQ
What is the guaranteed operating junction temperature range for LT8609AJMSE16#TRPBF?
The LT8609AJMSE16#TRPBF is guaranteed over the full –40°C to 150°C junction temperature range per AEC-Q100 Grade 1 qualification. This enables deployment in under-hood locations such as engine control units and transmission control modules where ambient temperatures exceed 125°C. Thermal derating applies above 125°C to ensure lifetime reliability.
Does LT8609AJMSE16#TRPBF require external feedback resistors for 5V output?
No. The LT8609AJMSE16#TRPBF integrates an 8.95MΩ internal feedback divider that sets the output to precisely 5.00V. No external resistors are needed - simplifying layout, improving long-term stability, and eliminating resistor tolerance errors. The VOUT pin is the regulated output terminal.
How does the SYNC pin function on LT8609AJMSE16#TRPBF?
On the LT8609AJMSE16#TRPBF, the SYNC pin supports three modes: grounded for Burst Mode (2.5µA IQ), floated for pulse-skipping, or biased to 3.2–5.0V for spread-spectrum modulation. Unlike the LT8609B, it retains full SYNC functionality - enabling EMI optimization without sacrificing light-load efficiency.
What is the power-good (PG) accuracy specification for LT8609AJMSE16#TRPBF?
The LT8609AJMSE16#TRPBF asserts PG high when VOUT reaches within ±7.5% of 5.00V and remains high until VOUT falls outside that window or a fault occurs. This tight window ensures reliable microcontroller reset sequencing and meets ASIL-B functional safety timing requirements in automotive applications.
Can LT8609AJMSE16#TRPBF operate down to 3.0V input voltage?
Yes. The LT8609AJMSE16#TRPBF supports a minimum input voltage of 3.0V, enabling operation during automotive cold-crank events (down to ~4.5V battery) when combined with appropriate input capacitance. Its 45ns minimum on-time sustains regulation even at high duty cycles required for low-VIN conditions.
LT8609AJMSE16#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT8609AJMSE16#TRPBF FAQ
1.How can I place an order for LT8609AJMSE16#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AJMSE16#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 LT8609AJMSE16#TRPBF reliable?
The price and inventory of LT8609AJMSE16#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AJMSE16#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8609AJMSE16#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AJMSE16#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AJMSE16#TRPBF?
LT8609AJMSE16#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AJMSE16#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 LT8609AJMSE16#TRPBF?
For technical support, including LT8609AJMSE16#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AJMSE16#TRPBF requirements.
6.How does Aetrix verify that LT8609AJMSE16#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8609AJMSE16#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 LT8609AJMSE16#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8609AJMSE16#TRPBF?
All LT8609AJMSE16#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AJMSE16#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 LT8609AJMSE16#TRPBF part is unused and in its original packaging.
Return procedure for LT8609AJMSE16#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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