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Analog Devices Inc. LT8609BIMSE#PBF
- Part No.:
- LT8609BIMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609BIMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:601
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Product details
Overview
LT8609BIMSE#PBF from Analog Devices is a 42V, 3A synchronous step-down regulator operating in pulse-skipping mode only, with 350µA non-switching quiescent current at 2V EN/UV and 45ns minimum on-time. It delivers regulated output from 3.0V to 42V input, supports 2MHz switching (RT = 18.2kΩ), and features internal compensation, peak current mode control, and ±8.5% power-good accuracy for adjustable-output configurations. It is used in automotive infotainment power supplies requiring low-noise, high-efficiency DC/DC conversion.
For engineers reviewing the LT8609BIMSE#PBF datasheet, LT8609BIMSE#PBF pinout, LT8609BIMSE#PBF application, or LT8609BIMSE#PBF equivalent, key selection criteria include its pulse-skipping-only operation (no Burst Mode), absence of SYNC pin, fixed 0.772V feedback reference, 10-lead MSOP package with exposed GND pad, and AEC-Q100 qualification for automotive use.
Technical Context
The LT8609B employs peak current mode topology with internal compensation, enabling fast transient response and stable loop behavior using small external inductors. Its oscillator is resistor-programmable (RT pin) and operates at 1.875–2.125MHz over temperature when RT = 18.2kΩ.
Unlike LT8609/LT8609A, the LT8609B omits the SYNC pin and operates exclusively in pulse-skipping mode-no Burst Mode, no spread spectrum, and no external clock synchronization. Its EN/UV threshold is 1.05V (rising), with 50mV hysteresis, and PG flag asserts when FB deviates >±8.5% from regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports wide-range automotive battery and industrial supply rails without pre-regulation. |
| Output Current | 3A continuous - sufficient for powering DSPs, microcontrollers, and sensor interfaces in compact systems. |
| Quiescent Current | 350µA at 2V EN/UV (non-switching) - enables always-on subsystems with minimal standby drain. |
| Switching Frequency | 1.875–2.125MHz (RT = 18.2kΩ) - allows use of sub-3mm inductors and reduces EMI filter size. |
| Feedback Reference | 0.772V (min) to 0.792V (max) - sets output voltage via external resistor divider; tolerance impacts output accuracy. |
| Min On-Time | 45ns - enables high VIN-to-low VOUT conversion (e.g., 42V→3.3V) at 2MHz without pulse skipping. |
| Power-Good Accuracy | ±8.5% on FB pin - provides reliable enable signaling for downstream logic or sequencing circuits. |
Pinout & Package
LT8609BIMSE#PBF is housed in 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 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; no series resistor allowed. |
| SW | Switch node connecting internal top/bottom FETs to inductor | High dv/dt node; must be minimized on PCB to reduce EMI and switching loss. |
| INTVCC | Internal 3.5V regulator output | Bypass with ≥1µF low-ESR ceramic; not for external loading. |
| RT | Oscillator frequency programming input | Resistor to GND sets fSW; 18.2kΩ yields ~2MHz nominal. |
| EN/UV | Enable and input undervoltage lockout input | 1.05V rising threshold; hysteresis enables clean startup/shutdown in noisy environments. |
| VIN | Main input power supply | Must be locally bypassed with low-ESR capacitor adjacent to VIN and GND pins. |
| PG | Open-drain power-good flag | Pulled low until FB within ±8.5%; valid above 3.2V VIN regardless of EN/UV state. |
| TR/SS | Soft-start and tracking control | 2µA internal pull-up enables RC-controlled ramp rate; pulled low during fault. |
| FB | Feedback input for adjustable-output regulation | Regulated to 0.772–0.792V; connects external resistor divider for VOUT setting. |
| GND | Power and signal ground reference | Exposed pad (Pin 11) is GND and must be soldered to PCB thermal plane. |
Key Features
| Feature | Design Value |
|---|---|
| Pulse-skipping-only operation | Eliminates Burst Mode complexity; ensures deterministic light-load behavior without low-frequency ripple. |
| No SYNC pin | Reduces external component count and PCB routing; removes EMI mitigation trade-offs of spread spectrum or sync inputs. |
| 45ns minimum on-time | Enables direct 42V-to-3.3V/5V conversion at 2MHz, avoiding cascaded regulators and saving board space. |
| AEC-Q100 qualified (Grade I) | Rated for –40°C to +125°C junction temperature; validated for automotive infotainment and body electronics. |
| Internal compensation | Removes need for external compensation network; simplifies design and improves production consistency. |
Applications
| Automotive Infotainment Power | Industrial Sensor Hub Supply |
|---|---|
Use Scenario: Powering audio DSPs and display controllers in head units with cold-crank (4.5V) and load-dump (42V) transients. IC Role / Device Role / Timing Role: Primary 3.3V/5V buck converter delivering 3A with ultralow IQ to maintain system wakefulness during sleep modes. Use Value: 350µA non-switching IQ extends battery reserve time; 42V max input withstands automotive transients without protection circuitry. | Use Scenario: Providing stable 3.3V rail to multi-sensor nodes in factory automation gateways with wide-input unregulated 24V supplies. IC Role / Device Role / Timing Role: High-efficiency, low-EMI step-down regulator supporting isolated CAN/RS-485 PHYs and ADC references. Use Value: 2MHz operation minimizes inductor size; pulse-skipping avoids audible noise in sensitive measurement environments. |
| Portable Medical Monitor Rail | Telematics Control Unit (TCU) Core Supply |
Use Scenario: Generating 5V for ARM Cortex-M7 MCU and Wi-Fi module in battery-backed portable diagnostics equipment. IC Role / Device Role / Timing Role: Main system buck regulator with soft-start (TR/SS) for controlled power-up sequencing and PG for safe firmware initialization. Use Value: ±8.5% PG accuracy ensures reliable boot validation; 10-lead MSOP fits tight layout constraints. | Use Scenario: Supplying 3.3V to LTE modem and GNSS receiver in vehicle-mounted telematics units operating across extended temperature ranges. IC Role / Device Role / Timing Role: AEC-Q100-compliant primary DC/DC converter with thermal robustness and fault-flag signaling (PG). Use Value: Exposed-pad MSOP achieves 40°C/W θJA; PG flag enables watchdog reset coordination during brownout events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8609AIMSE#PBF | Includes SYNC pin; supports Burst Mode, pulse-skipping, and spread spectrum; 1.7µA IQ in Burst Mode. | Preferred where low-noise light-load operation or EMI reduction is critical; requires additional SYNC routing. | Select LT8609AIMSE#PBF if system requires programmable EMI control or lowest possible IQ at microamp loads. |
| LT8609BEMSE#PBF | Same functionality and pinout; differs only in temperature grade (–40°C to +125°C vs. –40°C to +125°C - identical spec; "I" denotes extended test coverage per Analog Devices internal qualification). | No functional difference; both meet AEC-Q100 Grade I requirements. | LT8609BEMSE#PBF is functionally identical but may have different traceability or lot-level screening; verify with procurement for OEM compliance needs. |
Compared with LT8609AIMSE#PBF, LT8609BIMSE#PBF trades Burst Mode flexibility and SYNC configurability for simplified layout and guaranteed pulse-skipping determinism; versus LT8609BEMSE#PBF, it offers identical electrical performance with enhanced test coverage for mission-critical automotive deployments.
Availability
LT8609BIMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial sensor hubs, portable medical monitors, and telematics control units requiring stable component supply with AEC-Q100 qualification and extended temperature support.
Supply support for LT8609BIMSE#PBF 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 instrumentation, industrial, automotive, and communications markets.
The LT8609B belongs to Analog Devices' Silent Switcher®-adjacent monolithic buck regulator product line, designed specifically for automotive and industrial applications demanding ultra-low IQ, high input voltage tolerance, and robust EMC performance without external shielding.
FAQ
Does LT8609BIMSE#PBF support Burst Mode operation?
No, LT8609BIMSE#PBF operates exclusively in pulse-skipping mode and does not support Burst Mode. This is a deliberate variant distinction: the LT8609B omits the SYNC pin and disables Burst Mode circuitry to ensure deterministic light-load behavior and simplify EMI characterization. For Burst Mode capability, consider LT8609AIMSE#PBF instead.
What is the feedback reference voltage tolerance for LT8609BIMSE#PBF?
The LT8609BIMSE#PBF has a feedback reference voltage range of 0.759V (min) to 0.805V (max) over temperature and load, with typical value 0.772V. This tolerance directly impacts output voltage accuracy when using external resistors; for example, a 3.3V output design will exhibit ±1.8% variation due to reference drift alone.
Can LT8609BIMSE#PBF synchronize to an external clock?
No, LT8609BIMSE#PBF cannot synchronize to an external clock because it lacks a SYNC pin. The LT8609B variant is hardwired for pulse-skipping-only operation with fixed internal oscillator control. If external clock synchronization is required, LT8609AIMSE#PBF or LT8609EMSE#PBF must be selected instead.
What package type and thermal characteristics does LT8609BIMSE#PBF use?
LT8609BIMSE#PBF uses a 10-lead plastic MSOP package (MSE) with exposed thermal pad (Pin 11 = GND), rated at θJA = 40°C/W. The exposed pad must be soldered to a PCB copper plane for effective heat dissipation and optimal thermal performance in automotive and industrial environments.
Is LT8609BIMSE#PBF qualified for automotive applications?
Yes, LT8609BIMSE#PBF is AEC-Q100 qualified for automotive applications (Grade I, –40°C to +125°C junction temperature). It undergoes stress testing including HTOL, TC, and UHAST per AEC-Q100 Rev H, and is approved for use in infotainment, telematics, and body electronics systems requiring high reliability under harsh conditions.
LT8609BIMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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
LT8609BIMSE#PBF FAQ
1.How can I place an order for LT8609BIMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609BIMSE#PBF 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 LT8609BIMSE#PBF reliable?
The price and inventory of LT8609BIMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609BIMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8609BIMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609BIMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609BIMSE#PBF?
LT8609BIMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609BIMSE#PBF 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 LT8609BIMSE#PBF?
For technical support, including LT8609BIMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609BIMSE#PBF requirements.
6.How does Aetrix verify that LT8609BIMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8609BIMSE#PBF 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 LT8609BIMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8609BIMSE#PBF?
All LT8609BIMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609BIMSE#PBF, 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 LT8609BIMSE#PBF part is unused and in its original packaging.
Return procedure for LT8609BIMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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