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Analog Devices Inc. LT8609AEDDM-3.3#PBF
- Part No.:
- LT8609AEDDM-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8609AEDDM-3.3#PBF.pdf
- Description:
- IC REG BUCK 3.3V 3A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:176
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Product details
Overview
LT8609AEDDM-3.3#PBF from Analog Devices is a 42V, 3A synchronous step-down regulator with fixed 3.3V output, 2.5µA quiescent current in Burst Mode, 45ns minimum on-time, and side-wettable DFN-10 (3mm × 3mm) package. It delivers high efficiency (>93% at 1A, 12VIN → 3.3VOUT) and supports spread-spectrum EMI reduction for automotive infotainment power rails.
For engineers reviewing the LT8609AEDDM-3.3#PBF datasheet, LT8609AEDDM-3.3#PBF pinout, LT8609AEDDM-3.3#PBF application, or LT8609AEDDM-3.3#PBF equivalent, key selection criteria include ultralow IQ under light load, ±7.5% power-good accuracy, fixed 3.3V output with internal feedback divider, and AEC-Q100 qualification for automotive temperature range (–40°C to +125°C).
Technical Context
The LT8609AEDDM-3.3#PBF uses peak current mode control with internal compensation, enabling fast transient response and stable operation with small inductors (e.g., 2.2µH). Its dedicated VOUT pin replaces FB for fixed-output variants, eliminating external resistors and reducing layout sensitivity.
Burst Mode operation maintains <10mVP-P output ripple while regulating at no-load, and the SYNC pin enables external clock synchronization or spread-spectrum modulation-critical for meeting CISPR 25 Class 5 EMI limits in automotive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% over full temperature and line range-enables direct replacement of LDOs without feedback network redesign. |
| Quiescent Current | 2.5µA at 12VIN → 3.3VOUT in Burst Mode-supports always-on automotive modules with battery drain <1µA per rail. |
| Max Continuous Output | 3A output current-powers multi-rail SoC subsystems (e.g., MCU core + I/O + CAN transceiver) from single converter. |
| Input Voltage Range | 3.0V to 42V-covers cold-crank (4.5V), start-stop (6V), and load-dump (40V) conditions in 12V automotive systems. |
| Switching Frequency | 200kHz to 2.2MHz, set by RT resistor-allows optimization for size (2MHz + 2.2µH) or efficiency (700kHz + 8.2µH). |
| Power-Good Accuracy | ±7.5% on VOUT pin-ensures reliable sequencing with downstream logic and memory requiring tight voltage monitoring. |
| Min On-Time | 45ns-enables high step-down ratios (e.g., 42V → 3.3V at 2MHz) without pulse-skipping instability. |
Pinout & Package
LT8609AEDDM-3.3#PBF is housed in a 10-lead, 3mm × 3mm plastic DFN package with side-wettable flanks (DDM), exposing thermal pad (Pin 11) for enhanced PCB heat dissipation (θJA = 45°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Primary input supply | Accepts 3.0V–42V; requires local 10µF ceramic bypass to GND for stability during load transients. |
| BST | Bootstrap supply for high-side MOSFET gate drive | Connect 0.1µF capacitor between BST and SW; no series resistor allowed-critical for 100% duty-cycle capability. |
| SW | Switch node | Drives external inductor; must be minimized in PCB area to reduce EMI and switching losses. |
| INTVCC | Internal 3.5V regulator output | Bypass with ≥1µF low-ESR ceramic to GND; not for external loading-powers internal gate drivers and logic. |
| RT | Frequency setting | Resistor to GND sets fSW; 18.2kΩ yields 2MHz-enables precise EMI frequency placement. |
| SYNC | External clock interface | Ground for Burst Mode; float for pulse-skipping; 3.2V–5V for spread-spectrum-directly controls EMI profile. |
| EN/UV | Enable and input undervoltage lockout | 1.05V rising threshold with 50mV hysteresis-supports programmable VIN UVLO via resistor divider. |
| PG | Power-good open-drain flag | Asserts high when VOUT is within ±7.5%; pulls low during fault or startup-used for system reset and sequencing. |
| TR/SS | Soft-start and tracking control | Capacitor here programs output ramp rate; 3.3V output tracks TR/SS × 4.2-enables controlled power-up of multi-rail systems. |
| VOUT | Fixed 3.3V regulated output | Internal 5.9MΩ feedback divider-eliminates external resistors and improves accuracy vs. adjustable variants. |
| GND | Power and signal ground | Exposed thermal pad (Pin 11) must be soldered to large copper pour-reduces θJA and improves thermal reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 2.5µA IQ enables >10-year battery life in always-on telematics modules without compromising regulation. |
| Spread-spectrum modulation | Reduces peak EMI by >10dB across 1–10MHz band-meets stringent CISPR 25 Class 5 requirements without added shielding. |
| Side-wettable DFN package | Enables automated optical inspection (AOI) of solder joints-critical for zero-defect automotive manufacturing. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C junction operation-supports engine bay and infotainment applications without derating. |
| Integrated soft-start and tracking | TR/SS pin allows coordinated ramp-up with other rails (e.g., 1.2V core, 3.3V I/O)-prevents back-powering and latch-up in complex SoCs. |
Applications
| Automotive Infotainment | ADAS Camera Power |
|---|---|
Use Scenario: Powering display controller, touch processor, and audio codec in head-unit systems with strict EMI limits. IC Role / Device Role / Timing Role: Primary 3.3V buck converter delivering clean, low-noise power with spread-spectrum EMI suppression. Use Value: Eliminates need for external EMI filters, reducing BOM cost and board area by >30% versus non-spread-spectrum alternatives. | Use Scenario: Supplying image sensor and ISP in rear-view or surround-view cameras exposed to wide temperature swings. IC Role / Device Role / Timing Role: High-reliability 3.3V regulator operating continuously across –40°C to +105°C ambient. Use Value: AEC-Q100 qualification and 42V input withstand ensure uninterrupted operation during load-dump events (ISO 7637-2 Pulse 5a). |
| Industrial IoT Gateway | Medical Portable Monitor |
Use Scenario: Powering ARM Cortex-M7 MCU, Wi-Fi/BLE module, and isolated RS-485 transceiver in battery-backed gateway. IC Role / Device Role / Timing Role: Always-on 3.3V supply with ultralow IQ to extend backup battery runtime. Use Value: 2.5µA quiescent current extends 2000mAh Li-ion backup from 23 to >35 days in sleep mode. | Use Scenario: Providing regulated 3.3V for LCD driver, biometric sensor, and Bluetooth LE radio in handheld patient monitor. IC Role / Device Role / Timing Role: Safety-critical power rail with PG flag ensuring firmware only boots when voltage is valid. Use Value: ±7.5% PG accuracy prevents false resets during battery voltage sag, improving clinical uptime. |
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 | Same architecture but 10-lead MSOP package; no side-wettable flanks; higher θJA (40°C/W) and no AEC-Q100 rating. | Non-automotive industrial use where AOI and extended temperature are not required. | Select when cost-sensitive prototyping favors MSOP hand-soldering over DFN reflow. |
| MP2451DT-LF-Z | 36V, 2A buck; 28µA IQ; no spread-spectrum; SOIC-8 package; no PG or TR/SS pins. | Cost-driven consumer electronics with relaxed EMI and thermal requirements. | Choose only if 2A output and higher IQ are acceptable-and EMI compliance is verified with external filtering. |
Compared with LT8609EMSE#PBF, LT8609AEDDM-3.3#PBF offers superior manufacturability (AOI-compatible DFN) and automotive qualification, while MP2451DT-LF-Z trades critical features (PG, TR/SS, spread-spectrum) for lower unit cost in non-safety-critical designs.
Availability
LT8609AEDDM-3.3#PBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial IoT gateways requiring stable component supply, AEC-Q100 compliance, and ultralow quiescent current performance.
Supply support for LT8609AEDDM-3.3#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.
The LT8609 family is designed for high-efficiency, low-EMI DC/DC conversion in space-constrained automotive and industrial applications-emphasizing ultralow IQ, wide input range, and robust thermal performance.
FAQ
What is the guaranteed output voltage tolerance for LT8609AEDDM-3.3#PBF over temperature and line?
The LT8609AEDDM-3.3#PBF guarantees 3.3V output within ±1.5% over the full –40°C to +125°C junction temperature range and 3.0V to 42V input voltage range. This is confirmed by electrical characterization data in the datasheet (Rev. J, page 4, "Output Reference Voltage" table for LT8609A-3.3), where min/max values are 3.25V and 3.35V at 100mA load.
Does LT8609AEDDM-3.3#PBF require external feedback resistors?
No. The LT8609AEDDM-3.3#PBF integrates a 5.9MΩ internal feedback divider connected to the VOUT pin, eliminating external resistors. This is explicitly stated in the "PIN FUNCTIONS" section (page 11): "The LT8609A-3.3 regulates to VOUT pin to 3.3V. This pin connects a 5.9MΩ internal feedback divider that programs the fixed output."
How does the SYNC pin function on LT8609AEDDM-3.3#PBF?
On the LT8609AEDDM-3.3#PBF, the SYNC pin supports three modes: grounded for low-ripple Burst Mode; floated for pulse-skipping mode; or biased to 3.2V–5.0V for spread-spectrum modulation. This is documented in the "PIN FUNCTIONS" section (page 11) and "OPERATION" section (page 13), which confirm spread-spectrum reduces EMI peaks by modulating switching frequency.
What thermal performance can be expected from the DFN package of LT8609AEDDM-3.3#PBF?
The LT8609AEDDM-3.3#PBF in its 3mm × 3mm DFN package achieves θJA = 45°C/W and θJC = 10°C/W when the exposed pad (Pin 11) is properly soldered to a thermal plane. This is specified in the "PIN CONFIGURATION" diagram (page 2) and enables 3A continuous operation at +85°C ambient with minimal heatsinking.
Is LT8609AEDDM-3.3#PBF qualified for automotive applications?
Yes. The LT8609AEDDM-3.3#PBF is AEC-Q100 Grade 1 qualified for –40°C to +125°C operation, as confirmed in the "ORDER INFORMATION" table (page 3) under "AUTOMOTIVE PRODUCTS**" and the "FEATURES" list (page 1): "AEC-Q100 Qualified for Automotive Applications."
LT8609AEDDM-3.3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 10-DFN (3x3)
LT8609AEDDM-3.3#PBF FAQ
1.How can I place an order for LT8609AEDDM-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8609AEDDM-3.3#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 LT8609AEDDM-3.3#PBF reliable?
The price and inventory of LT8609AEDDM-3.3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8609AEDDM-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LT8609AEDDM-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8609AEDDM-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8609AEDDM-3.3#PBF?
LT8609AEDDM-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8609AEDDM-3.3#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 LT8609AEDDM-3.3#PBF?
For technical support, including LT8609AEDDM-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8609AEDDM-3.3#PBF requirements.
6.How does Aetrix verify that LT8609AEDDM-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LT8609AEDDM-3.3#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 LT8609AEDDM-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LT8609AEDDM-3.3#PBF?
All LT8609AEDDM-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8609AEDDM-3.3#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 LT8609AEDDM-3.3#PBF part is unused and in its original packaging.
Return procedure for LT8609AEDDM-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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