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Analog Devices Inc. LT8609AEMSE#PBF
- Part No.:
- LT8609AEMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT8609AEMSE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,843
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Product details
Overview
LT8609AEMSE#PBF from Analog Devices is a 42V, 3A synchronous step-down regulator with 2.5µA quiescent current in Burst Mode, fixed 5V output, and integrated power switches in a 10-lead MSOP package. It delivers high efficiency (>93% at 1A, 12VIN to 5VOUT), supports 200kHz–2.2MHz switching (via RT resistor), and features spread-spectrum EMI reduction - ideal for automotive infotainment power rails requiring low-noise, wide-input DC/DC conversion.
For engineers reviewing the LT8609AEMSE#PBF datasheet, LT8609AEMSE#PBF pinout, LT8609AEMSE#PBF application, or LT8609AEMSE#PBF equivalent, key selection factors include its fixed 5V output, 45ns minimum on-time, ±7.5% power-good accuracy, AEC-Q100 qualification, and compatibility with small 2.2µH inductors for compact layout in space-constrained automotive modules.
Technical Context
The LT8609AEMSE#PBF implements peak current mode control with internal compensation, enabling fast transient response and stable operation with minimal external components. Its oscillator frequency is set by an external RT resistor (e.g., 18.2kΩ yields 2MHz) and supports synchronization or spread-spectrum modulation via the SYNC pin to reduce EMI emissions.
It integrates top and bottom NMOS power switches (185mΩ/115mΩ RDS(on)), uses a 0.782V internal reference for adjustable variants, and - in this fixed-output variant - regulates VOUT directly to 5.00V ±1.1% over temperature and line. The EN/UV pin provides accurate 1.05V enable threshold with 50mV hysteresis for reliable input UVLO programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.00V ±1.1% (guaranteed over –40°C to 125°C junction temp) |
| Max Continuous Output Current | 3A - supports high-current loads like microcontroller cores or CAN transceivers without external boost |
| Input Voltage Range | 3.0V to 42V - enables direct connection to automotive battery (cold-crank tolerant down to 3.0V) |
| Quiescent Current (Burst Mode) | 2.5µA at no load (12VIN → 5VOUT) - extends battery life in always-on vehicle modules |
| Switching Frequency Range | 200kHz to 2.2MHz - selectable via RT resistor; 2MHz operation allows use of <2.2µH inductors for size reduction |
| Minimum On-Time | 45ns - enables high step-down ratios (e.g., 42V→5V at 2MHz) without pulse-skipping instability |
| Power-Good Accuracy | ±7.5% window on VOUT - ensures reliable system reset timing for downstream processors |
Pinout & Package
LT8609AEMSE#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 gate driver | Requires 0.1µF ceramic capacitor to SW; enables efficient 42V-rated top switch operation |
| SW | Switch node | Connects to inductor and BST capacitor; critical high-dI/dt node requiring minimized PCB loop area |
| INTVCC | Internal 3.5V regulator bypass | Must be decoupled with ≥1µF low-ESR ceramic; powers gate drivers and control logic |
| RT | Oscillator frequency setting | Resistor to GND sets fSW; 18.2kΩ = 2MHz - determines inductor size and EMI profile |
| SYNC | External clock/synchronization input | Ground for Burst Mode; float for pulse-skipping; 3.2–5V for spread-spectrum EMI reduction |
| EN/UV | Enable and input undervoltage lockout | 1.05V rising threshold with 50mV hysteresis - enables programmable VIN UVLO using resistor divider |
| PG | Open-drain power-good flag | Pulls low until VOUT reaches ±7.5% of 5V and remains stable; drives MCU reset or sequencing logic |
| TR/SS | Soft-start and tracking control | Capacitor here sets output ramp rate; internal 2µA current source enables precise startup timing |
| VIN | Main input supply | Supplies IC bias and top switch; requires local high-frequency bypass (e.g., 10µF X7R + 1µF X5R) |
| GND | Power and signal ground | Exposed pad (Pin 11) is GND - must be soldered to large PCB copper pour for thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Qualified | Rated for automotive applications (Grade E: –40°C to +125°C junction), supporting under-hood and infotainment use |
| Ultralow Quiescent Current | 2.5µA IQ in Burst Mode enables >10-year battery standby in always-on telematics modules |
| Spread-Spectrum Modulation | Reduces peak EMI by up to 10dB across 1–6kHz band - simplifies compliance with CISPR 25 Class 5 |
| Integrated Power Switches | Eliminates need for external MOSFETs and drivers - reduces BOM count and layout complexity |
| Fast Minimum On-Time | 45ns enables high-frequency, high-ratio conversion (e.g., 42V→5V @ 2MHz) without duty-cycle limitation |
| Accurate Power-Good Flag | ±7.5% VOUT window ensures deterministic system reset behavior during brown-out recovery |
Applications
| Automotive Infotainment | GSM/GNSS Module Power |
|---|---|
|
Use Scenario: Powering DSP, display controller, and audio codec in head-unit systems with 12V/24V battery input and cold-crank survival requirement. IC Role / Device Role / Timing Role: Primary 5V system rail regulator delivering 3A continuous current with ultralow IQ to maintain functionality during ignition-off sleep mode. Use Value: 2.5µA quiescent current prevents battery drain over weeks; 42V max input withstands load-dump transients per ISO 7637-2. |
Use Scenario: Supplying 5V to cellular modem (LTE/GSM) and GNSS receiver in telematics control units with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise, spread-spectrum-enabled DC/DC converter providing clean 5V rail synchronized to baseband clock to avoid heterodyne interference. Use Value: Spread-spectrum modulation reduces radiated emissions below CISPR 25 Class 5 limits without added shielding or filters. |
| Industrial Control I/O | ADAS Camera Power |
|
Use Scenario: Generating 5V for PLC digital I/O modules operating from unregulated 24V industrial bus with wide ambient temperature range. IC Role / Device Role / Timing Role: Robust, thermally efficient step-down regulator with integrated thermal shutdown and PG flag for safe system boot and fault reporting. Use Value: Exposed-pad MSOP package achieves 40°C/W θJA; ±7.5% PG accuracy enables reliable FPGA configuration sequencing. |
Use Scenario: Powering image sensor and serializer in rear-view or surround-view cameras where EMI must not corrupt video data lines. IC Role / Device Role / Timing Role: Compact, low-ripple 5V supply with 45ns min-on-time supporting high-frequency switching near sensitive analog video paths. Use Value: 2MHz operation allows use of tiny 2.2µH inductors - minimizing board area while maintaining <10mVP-P output ripple in Burst Mode. |
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 |
|---|---|---|---|
| LT8609EMSE#PBF | Adjustable output (0.782V reference), same 3A/42V specs and package; lacks fixed 5V internal divider | Requires external feedback resistors; suitable when multiple output voltages are needed on same board | Select LT8609EMSE#PBF only if design requires adjustable VOUT or shared feedback network across rails |
| LT8609AEDDM#PBF | Same electrical specs and fixed 5V output, but in 10-lead 3mm×3mm side-wettable DFN package | Offers lower θJA (45°C/W vs 40°C/W) and improved thermal performance in high-density layouts | Choose LT8609AEDDM#PBF for space-constrained designs needing enhanced thermal dissipation or automated optical inspection (AOI) support |
Compared with LT8609EMSE#PBF, the LT8609AEMSE#PBF eliminates feedback resistor selection and layout overhead for 5V systems; versus LT8609AEDDM#PBF, it trades slightly higher thermal resistance for established MSOP assembly compatibility and legacy footprint reuse.
Availability
LT8609AEMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial control I/O, and ADAS camera power applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LT8609AEMSE#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 automation, and automotive markets since 1965.
The LT8609A series belongs to Analog Devices' Power by Linear™ portfolio of high-efficiency, low-EMI monolithic DC/DC regulators designed specifically for automotive and noise-sensitive industrial applications demanding ultralow quiescent current and robust transient performance.
FAQ
What is the guaranteed output voltage tolerance for LT8609AEMSE#PBF over temperature?
The LT8609AEMSE#PBF delivers a fixed 5.00V output with ±1.1% total tolerance over the full –40°C to +125°C junction temperature range, including initial accuracy, line regulation, and load regulation effects. This is confirmed in the Electrical Characteristics table for LT8609A-5 variants under "Output Reference Voltage" with VIN = 12V and ILOAD = 100mA.
Does LT8609AEMSE#PBF support synchronization to an external clock, and what are the voltage requirements?
Yes, LT8609AEMSE#PBF supports external clock synchronization via the SYNC pin. A logic-low (≤0.9V) enables Burst Mode; floating enables pulse-skipping; applying 3.2V–5.0V enables spread-spectrum modulation. The SYNC pin accepts CMOS-level inputs referenced to INTVCC (3.5V nominal), with specified thresholds of 0.4V (low) and 2.7V (high) when INTVCC = 3.5V.
How is the power-good (PG) flag asserted on LT8609AEMSE#PBF, and what is its accuracy window?
The PG pin on LT8609AEMSE#PBF is an open-drain output that remains low until VOUT reaches and sustains ±7.5% of the nominal 5V output (i.e., 4.625V–5.375V). It asserts high only after this window is met and no fault conditions (e.g., overtemperature, UVLO) are present. PG is valid when VIN exceeds 3.2V, independent of EN/UV state.
What is the minimum recommended input capacitance for stable operation of LT8609AEMSE#PBF at 3A load?
Analog Devices recommends ≥10µF of high-frequency ceramic input capacitance (X7R/X5R) placed as close as possible to the VIN and GND pins of LT8609AEMSE#PBF, supplemented by ≥1µF local bypass on INTVCC. This minimizes input ripple and prevents instability under 3A pulsed loads, especially during cold-crank (3V input) or load-dump (42V transient) events.
Is LT8609AEMSE#PBF pin-compatible with other variants in the LT8609 family, such as LT8609EMSE#PBF?
Yes, LT8609AEMSE#PBF shares identical pinout, package (10-lead MSOP), and footprint with LT8609EMSE#PBF and LT8609BEMSE#PBF. All three variants use the same MSE package with exposed thermal pad (Pin 11 = GND), enabling drop-in replacement for functional evaluation - though output configuration (fixed 5V vs adjustable vs pulse-skipping-only) differs.
LT8609AEMSE#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
LT8609AEMSE#PBF FAQ
1.How can I place an order for LT8609AEMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AEMSE#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 LT8609AEMSE#PBF reliable?
The price and inventory of LT8609AEMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AEMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT8609AEMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AEMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AEMSE#PBF?
LT8609AEMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AEMSE#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 LT8609AEMSE#PBF?
For technical support, including LT8609AEMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AEMSE#PBF requirements.
6.How does Aetrix verify that LT8609AEMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT8609AEMSE#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 LT8609AEMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT8609AEMSE#PBF?
All LT8609AEMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AEMSE#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 LT8609AEMSE#PBF part is unused and in its original packaging.
Return procedure for LT8609AEMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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