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Analog Devices Inc. LT8609IMSE#TRPBF
- Part No.:
- LT8609IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609IMSE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:15,186
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Product details
Overview
LT8609IMSE#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 45ns minimum on-time. It operates from 3.0V to 42V input, delivers regulated 5V or adjustable output, and targets automotive infotainment power rails requiring low EMI and cold-crank operation.
For engineers reviewing the LT8609IMSE#TRPBF datasheet, LT8609IMSE#TRPBF pinout, LT8609IMSE#TRPBF application, or LT8609IMSE#TRPBF equivalent, key selection criteria include ultralow IQ at light load, 2MHz switching capability with spread spectrum, ±8.5% power-good accuracy, and MSOP-10 package compatibility with AEC-Q100–qualified thermal performance up to 125°C junction.
Technical Context
The LT8609IMSE#TRPBF implements constant-frequency peak current mode control with internal 0.782V reference and oscillator frequency set via RT resistor (200kHz–2.2MHz). Its architecture integrates top/bottom NMOS power switches (185mΩ/115mΩ), BST charge pump, and integrated 3.5V INTVCC regulator for gate drive.
Burst Mode operation enables <2.5µA input quiescent current while maintaining <10mVP-P output ripple; SYNC pin supports external clock synchronization or spread spectrum modulation. EN/UV pin provides accurate 1.05V rising threshold with 50mV hysteresis for programmable VIN UVLO or shutdown control.
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 - sustains full load at 125°C junction temperature with proper PCB copper and thermal pad soldering. |
| Quiescent Current | 2.5µA at 12VIN→3.3VOUT - enables >10-year battery life in always-on vehicle modules. |
| Switching Frequency | 200kHz to 2.2MHz - allows use of small 2.2µH inductors and avoids AM radio band; RT resistor sets exact frequency. |
| Feedback Reference | 0.782V ±0.004V - high-accuracy reference enables tight output regulation (±1%) over line/load/temperature. |
| Min On-Time | 45ns - supports high step-down ratios (e.g., 42V→3.3V at 2MHz) without pulse-skipping instability. |
| Power-Good Accuracy | ±8.5% on FB pin - ensures reliable system reset timing when output reaches regulation during startup or fault recovery. |
Pinout & Package
LT8609IMSE#TRPBF uses 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 EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor connection | Provides gate drive voltage >VIN for top NMOS; requires 0.1µF ceramic capacitor placed adjacent to IC. |
| SW | Switch node | Connects to inductor and BST capacitor; high di/dt node requiring minimized PCB loop area for EMI control. |
| INTVCC | Internal 3.5V regulator bypass | Must be decoupled with ≥1µF low-ESR ceramic capacitor; powers internal logic and gate drivers. |
| RT | Oscillator frequency setting | Resistor to GND sets switching frequency (e.g., 18.2kΩ = 2MHz); determines inductor size and efficiency trade-off. |
| SYNC | External clock/spectrum control | GND = Burst Mode; float = pulse-skipping; 3.2–5V = spread spectrum; not present on LT8609B variant. |
| EN/UV | Enable and input UVLO input | 1.05V rising threshold with 50mV hysteresis; enables programmable VIN brownout protection or remote ON/OFF. |
| PG | Power-good open-drain flag | Pulls low until FB within ±8.5% of 0.782V; used for processor reset sequencing or system enable interlock. |
| TR/SS | Soft-start and tracking control | 2µA internal current source charges external capacitor to control VOUT ramp rate; enables output tracking in multi-rail systems. |
| FB | Feedback input (adjustable version) | Regulated to 0.782V; connects to resistor divider for output voltage programming (e.g., 5V = 18.2kΩ/187kΩ). |
| VIN | Main input supply | Supplies internal circuitry and top switch; requires local 10µF+ low-ESR ceramic input capacitor with short GND path. |
| GND | Ground / Exposed Pad | Pin 11 is exposed thermal pad; must be soldered to large PCB ground plane for thermal dissipation and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | Reduces IQ to 2.5µA at no-load while limiting output ripple to <10mVP-P - critical for always-on automotive modules. |
| Synchronous Rectification | Integrated 185mΩ/115mΩ NMOS switches eliminate external Schottky loss, enabling >93% efficiency at 1A/5V from 12VIN. |
| Spread Spectrum Modulation | When SYNC = 3.3V, modulates switching frequency by ±10% at 3–6kHz - reduces peak EMI by 10dB without filter redesign. |
| Internal Compensation | Eliminates external compensation components; enables stable operation with 2.2µH inductors and fast transient response (<50µs). |
| Accurate Power-Good Flag | PG asserts only when FB is within ±8.5% of 0.782V and no fault exists - ensures deterministic system power sequencing. |
| Wide Temperature Grade | Rated for –40°C to +125°C junction operation (I-grade) - qualified per AEC-Q100 for under-hood automotive applications. |
Applications
| Automotive Infotainment | Industrial IoT Sensor Hub |
|---|---|
Use Scenario: Powering DSP, display controller, and CAN transceiver in head unit with 12V battery input subject to cold-crank (4.5V) and load-dump (40V) events. IC Role / Device Role / Timing Role: Primary 5V/3A DC/DC converter providing clean, regulated rail with Burst Mode for standby and spread spectrum for EMI compliance. Use Value: 2.5µA IQ extends backup battery life; 45ns min-on-time maintains regulation during 42V→5V conversion at 2MHz; PG flag synchronizes MCU wake-up. |
Use Scenario: Powering ultra-low-power wireless sensor node (BLE + MEMS + ADC) operating from LiSOCl₂ battery with 10-year lifetime requirement. IC Role / Device Role / Timing Role: Always-on buck regulator delivering 3.3V/100mA with minimal quiescent draw and precise soft-start to avoid brownout during wake-up bursts. Use Value: 2.5µA IQ enables >10-year battery life; TR/SS pin enables controlled VOUT ramp to prevent inrush into capacitive loads; ±8.5% PG accuracy ensures reliable MCU reset. |
| Telecom Remote Radio Unit | Medical Portable Diagnostic Device |
Use Scenario: Generating isolated 5V supply for FPGA and RF front-end in outdoor small cell base station powered from 48V PoE-derived input. IC Role / Device Role / Timing Role: High-input-voltage buck stage stepping 48V down to 5V before isolation; operates in pulse-skipping mode during burst traffic. Use Value: 42V absolute max rating accommodates 48V transients; 2MHz switching allows compact 2.2µH inductor; SYNC pin enables EMI reduction during sensitive measurement windows. |
Use Scenario: Powering clinical-grade ECG analog front-end and ARM Cortex-M4 processor in handheld diagnostic tool with strict low-noise and low-power requirements. IC Role / Device Role / Timing Role: Low-noise, low-ripple 3.3V supply for precision ADC and op-amps; uses Burst Mode during sleep and full-frequency mode during acquisition. Use Value: <10mVP-P ripple prevents signal corruption; internal compensation eliminates layout-sensitive compensation network; PG flag validates rail stability before sampling. |
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 | AEC-Q100 qualified I-grade part with identical electrical specs; same 10-lead MSOP package and pinout. | Designed for automotive production; includes extended reliability testing and traceable lot documentation. | Select LT8609AIMSE#TRPBF for Tier-1 automotive programs requiring PPAP and AEC-Q100 certification. |
| LT8609BIMSE#TRPBF | Removes SYNC pin; operates in pulse-skipping mode only (no Burst Mode or spread spectrum); higher IQ (~350µA in regulation). | Targeted at cost-sensitive industrial applications where EMI is managed externally and ultralow IQ is not required. | Choose LT8609BIMSE#TRPBF only if spread spectrum and sub-µA standby are unnecessary and BOM cost is primary constraint. |
Compared with LT8609IMSE#TRPBF, LT8609AIMSE#TRPBF adds automotive qualification without electrical change, while LT8609BIMSE#TRPBF sacrifices Burst Mode and EMI features for lower unit cost - making LT8609IMSE#TRPBF the optimal balance of performance, efficiency, and industrial reliability.
Availability
LT8609IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial IoT sensor hubs, telecom remote radio units, and medical portable diagnostic devices requiring stable component supply across long product lifecycles.
Supply support for LT8609IMSE#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 family is designed for high-efficiency, low-EMI, wide-input-voltage DC/DC conversion in space-constrained and thermally demanding environments - especially automotive and industrial applications requiring ultralow quiescent current.
FAQ
What is the maximum input voltage rating for LT8609IMSE#TRPBF?
The LT8609IMSE#TRPBF has an absolute maximum input voltage rating of 42V on the VIN and EN/UV pins. This allows direct operation from 36V nominal industrial buses or 48V telecom supplies with margin for transients. Sustained operation above 40V requires careful thermal design due to increased power dissipation in the top NMOS switch.
Does LT8609IMSE#TRPBF support adjustable output voltage?
Yes, LT8609IMSE#TRPBF supports adjustable output voltage via the FB pin, which is regulated to 0.782V. Output voltage is set using an external resistor divider (e.g., 18.2kΩ top / 187kΩ bottom for 5V). Unlike fixed-output variants (LT8609A-3.3/LT8609A-5), LT8609IMSE#TRPBF does not have internal feedback resistors and requires external divider configuration.
How is the switching frequency programmed on LT8609IMSE#TRPBF?
The switching frequency of LT8609IMSE#TRPBF is set by an external resistor connected between the RT pin and GND. For example, a 18.2kΩ resistor yields ~2.0MHz, 60.4kΩ yields ~700kHz, and 221kΩ yields ~200kHz. Frequency tolerance is ±15% over temperature and process; actual frequency can be measured at the SW node with appropriate probing techniques.
What thermal considerations apply to LT8609IMSE#TRPBF in MSOP-10 package?
LT8609IMSE#TRPBF in the 10-lead MSOP package has θJA = 40°C/W. To maintain ≤125°C junction temperature at 3A load, the PCB must include a solid GND plane connected to the exposed pad (Pin 11), ≥2 oz copper, and thermal vias under the pad. Without adequate copper, junction temperature may exceed rating even at moderate loads, triggering thermal shutdown.
Can LT8609IMSE#TRPBF be synchronized to an external clock?
Yes, LT8609IMSE#TRPBF supports external clock synchronization via the SYNC pin. When driven with a CMOS-level clock (200kHz–2.2MHz), the device aligns its switching edges to the external signal and operates in pulse-skipping mode. This enables deterministic EMI reduction and multi-phase interleaving in systems with multiple converters.
LT8609IMSE#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
LT8609IMSE#TRPBF FAQ
1.How can I place an order for LT8609IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609IMSE#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 LT8609IMSE#TRPBF reliable?
The price and inventory of LT8609IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8609IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609IMSE#TRPBF?
LT8609IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609IMSE#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 LT8609IMSE#TRPBF?
For technical support, including LT8609IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609IMSE#TRPBF requirements.
6.How does Aetrix verify that LT8609IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8609IMSE#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 LT8609IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8609IMSE#TRPBF?
All LT8609IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609IMSE#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 LT8609IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LT8609IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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