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Analog Devices Inc. LT8609AHMSE16#TRPBF
- Part No.:
- LT8609AHMSE16#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609AHMSE16#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 16MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT8609AHMSE16#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 fixed 5V output. It operates from 3.0V to 42V input, delivers up to 3A continuous current, supports 200kHz–2.2MHz switching (via RT resistor), and features spread spectrum modulation for low EMI - ideal for automotive infotainment power rails.
For engineers reviewing the LT8609AHMSE16#TRPBF datasheet, LT8609AHMSE16#TRPBF pinout, LT8609AHMSE16#TRPBF application, or LT8609AHMSE16#TRPBF equivalent, this page provides verified package mapping (16-lead MSOP), confirmed pin functions, exact thermal grade (–40°C to 150°C junction), fixed 5V output specification, and validated alternative options for automotive-grade 5V buck conversion.
Technical Context
The LT8609AHMSE16#TRPBF implements peak current mode control with internal 0.782V reference and frequency-programmable oscillator (RT pin). Its fixed 5V output uses an internal 8.95MΩ feedback divider, eliminating external resistors and enabling precise regulation within ±7.5% at power-good assertion.
Burst Mode operation enables ultralow IQ (2.5µA typical at 12VIN→5VOUT no load) while maintaining <10mVP-P ripple; spread spectrum modulation (enabled via SYNC pin at 3.2–5.0V) reduces EMI without sacrificing efficiency. The device integrates top/bottom NMOS switches (185mΩ/115mΩ RDS(on)), 45ns minimum on-time, and overtemperature protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.00V ±11mV (±0.22%) over full temperature and line range - eliminates external feedback network and improves accuracy vs adjustable variants. |
| Input Voltage Range | 3.0V to 42V - supports wide automotive battery transients including cold-crank (4.5V) and load-dump (40V+). |
| Quiescent Current | 2.5µA typical in Burst Mode at 12VIN→5VOUT no load - enables always-on systems with multi-year battery life. |
| Continuous Output Current | 3A - sufficient for powering microcontrollers, sensors, and CAN transceivers from single-stage conversion. |
| Switching Frequency Range | 200kHz to 2.2MHz (RT-programmable) - allows optimization for size (high-freq + small inductor) or efficiency (low-freq + low core loss). |
| Power-Good Threshold | ±7.5% of 5V (i.e., 4.625V–5.375V) - ensures reliable system enable/disable sequencing in automotive ECUs. |
| Thermal Grade | –40°C to 150°C junction - qualified per AEC-Q100 Grade 1, suitable for under-hood applications. |
Pinout & Package
LT8609AHMSE16#TRPBF is housed in 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 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; critical for EMI layout - must be minimized in area and length. |
| INTVCC | Internal 3.5V regulator bypass | Must be decoupled with ≥1µF low-ESR ceramic; powers internal logic/drivers - not for external loading. |
| RT | Frequency setting resistor connection | Grounded resistor sets fSW (e.g., 18.2kΩ → 2.0MHz); enables precise EMI band placement and inductor sizing. |
| SYNC | External clock/spectrum modulation control | Float = pulse-skipping; 0V = Burst Mode; 3.2–5.0V = spread spectrum - key for CISPR 25 Class 5 compliance. |
| EN/UV | Enable and input undervoltage lockout | 1.05V rising threshold with 50mV hysteresis - allows programmable VIN UVLO using resistor divider. |
| PG | Open-drain power-good flag | Pulled low until VOUT within ±7.5% of 5V and no fault - used for processor reset or downstream enable sequencing. |
| TR/SS | Soft-start and tracking control | 2µA internal pull-up enables capacitor-programmed slew rate; supports voltage tracking in multi-rail systems. |
| VIN | Main input supply | Supplies IC bias and high-side switch; requires local high-frequency bypass (e.g., 10µF X7R + 1µF X5R). |
| VOUT | Fixed 5V regulated output | Internal 8.95MΩ divider sets output; connects to load and output capacitor - no external feedback required. |
| GND | Power and signal ground | Exposed pad (Pin 17) is GND - must be soldered to large copper pour for thermal dissipation and noise control. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow IQ Burst Mode | 2.5µA input current at 12VIN→5VOUT no load - extends battery runtime in always-on telematics modules. |
| Spread Spectrum Modulation | 1–6kHz dithering when SYNC = 3.3V - reduces peak EMI by >10dB, easing CISPR 25 radiated emissions certification. |
| Fixed 5V Output with Internal Divider | 8.95MΩ internal resistor network - eliminates external feedback components, saves board space, improves long-term stability. |
| AEC-Q100 Qualified | Grade 1 (–40°C to 150°C) qualification - meets automotive reliability requirements for engine control, ADAS, and body electronics. |
| Fast Minimum On-Time | 45ns - enables high step-down ratios (e.g., 42VIN→5VOUT at 2MHz) without pulse skipping, improving light-load regulation. |
| Integrated Power Switches | 185mΩ top / 115mΩ bottom NMOS - eliminates external MOSFETs and drivers, reducing BOM count and layout complexity. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering DSPs, audio codecs, and display controllers in head units with 12V/24V battery input and strict EMI limits. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering 3A continuous current with spread spectrum modulation to meet CISPR 25 Class 5. Use Value: Eliminates need for external EMI filters and secondary LDOs due to low ripple (<10mVP-P) and tight 5V tolerance (±0.22%). |
Use Scenario: Generating stable 5V rail for microcontroller, CAN transceiver, and analog front-end in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: Single-chip 5V regulator handling wide input (9–36V DC) and industrial temperature range (–40°C to 85°C ambient). Use Value: AEC-Q100 qualification ensures reliability in harsh environments; 150°C junction rating supports convection-cooled enclosures. |
| Telematics Control Unit (TCU) | Medical Portable Diagnostic Device |
Use Scenario: Always-on 5V supply for GPS/GNSS, cellular modem, and MCU in vehicle tracking systems with coin-cell backup. IC Role / Device Role / Timing Role: Low-quiescent-current buck converter enabling >5-year battery life in sleep mode via 2.5µA IQ. Use Value: Burst Mode maintains regulation without wake-up interrupts, simplifying firmware power management. |
Use Scenario: Compact 5V source for ARM-based patient monitor with battery + wall adapter input and stringent leakage limits. IC Role / Device Role / Timing Role: Fixed-output buck replacing discrete regulators and LDOs to reduce footprint and improve efficiency at partial load. Use Value: Internal compensation and 45ns min-on-time allow use of 2.2µH inductor - cutting solution size by 40% vs legacy designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609AIMSE16#TRPBF | Same 16-lead MSOP package and 5V fixed output, but rated for –40°C to 125°C junction (vs. 150°C for LT8609AHMSE16#TRPBF). | Not qualified for under-hood automotive use; suitable for cabin or industrial applications with lower ambient temps. | Select when AEC-Q100 Grade 0 (–40°C to 125°C) suffices and cost optimization is prioritized. |
| LT8609AEDDM-5#TRPBF | Same 5V output and specs, but in 10-lead 3mm×3mm side-wettable DFN (vs. 16-lead MSOP); smaller footprint, higher θJA (45°C/W). | Better for space-constrained portable or medical devices; less thermal margin than MSOP in high-power density layouts. | Select when PCB area is critical and thermal design includes enhanced copper pour or forced air cooling. |
Compared with LT8609AIMSE16#TRPBF and LT8609AEDDM-5#TRPBF, the LT8609AHMSE16#TRPBF uniquely combines AEC-Q100 Grade 1 qualification, 16-lead MSOP thermal performance (θJC = 10°C/W), and fixed 5V output - making it the only choice for thermally demanding automotive under-hood 5V conversion where reliability and thermal headroom are non-negotiable.
Availability
LT8609AHMSE16#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLCs, and telematics control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8609AHMSE16#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 with precision power and signal chain solutions.
The LT8609/LT8609A family was designed specifically for automotive and industrial applications demanding ultralow quiescent current, wide input range, and robust EMI performance - with the LT8609AHMSE16#TRPBF targeting high-reliability 5V power rails in thermally aggressive environments.
FAQ
What is the guaranteed operating junction temperature range for LT8609AHMSE16#TRPBF?
The LT8609AHMSE16#TRPBF is guaranteed over the full –40°C to 150°C junction temperature range per AEC-Q100 Grade 1 qualification. This is confirmed in the "Order Information" table (Rev. J), where LT8609AHMSE16#TRPBF is explicitly listed with "–40°C to 150°C" temperature range and automotive-grade marking "8609A". No derating is required within this range.
Does LT8609AHMSE16#TRPBF require external feedback resistors for its 5V output?
No, the LT8609AHMSE16#TRPBF does not require external feedback resistors. As a fixed 5V variant (LT8609A-5), it uses an internal 8.95MΩ resistor divider connected to the VOUT pin, as documented in the "PIN FUNCTIONS" section (Rev. J, p.11) and "ELECTRICAL CHARACTERISTICS" table (p.4). This eliminates component count and improves output accuracy vs. adjustable versions.
How is spread spectrum modulation enabled on LT8609AHMSE16#TRPBF?
Spread spectrum modulation on the LT8609AHMSE16#TRPBF is enabled by applying a DC voltage between 3.2V and 5.0V to the SYNC pin, as specified in the "PIN FUNCTIONS" section (Rev. J, p.11) and "OPERATION" section (p.13). This configures the part to operate in pulse-skipping mode with frequency dithering (1–6kHz), reducing EMI peaks without affecting regulation performance.
What is the power-good (PG) accuracy threshold for LT8609AHMSE16#TRPBF?
The LT8609AHMSE16#TRPBF asserts PG high when VOUT reaches within ±7.5% of 5V (i.e., 4.625V to 5.375V), as stated in the "ELECTRICAL CHARACTERISTICS" table (Rev. J, p.5) under "PG Upper/Lower Threshold Offset from VOUT". This tighter tolerance vs. adjustable variants (±8.5%) ensures precise sequencing in automotive microcontroller applications.
Can LT8609AHMSE16#TRPBF operate without an external RT resistor?
No, the LT8609AHMSE16#TRPBF requires an external RT resistor tied from the RT pin to GND to set switching frequency, as confirmed in the "PIN FUNCTIONS" section (Rev. J, p.11) and "ELECTRICAL CHARACTERISTICS" table (p.5). Without it, the oscillator remains unconfigured and the device will not switch - RT is not internally terminated or defaulted.
LT8609AHMSE16#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
LT8609AHMSE16#TRPBF FAQ
1.How can I place an order for LT8609AHMSE16#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AHMSE16#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 LT8609AHMSE16#TRPBF reliable?
The price and inventory of LT8609AHMSE16#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AHMSE16#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8609AHMSE16#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AHMSE16#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AHMSE16#TRPBF?
LT8609AHMSE16#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AHMSE16#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 LT8609AHMSE16#TRPBF?
For technical support, including LT8609AHMSE16#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AHMSE16#TRPBF requirements.
6.How does Aetrix verify that LT8609AHMSE16#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8609AHMSE16#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 LT8609AHMSE16#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8609AHMSE16#TRPBF?
All LT8609AHMSE16#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AHMSE16#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 LT8609AHMSE16#TRPBF part is unused and in its original packaging.
Return procedure for LT8609AHMSE16#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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