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Analog Devices Inc. LT3663EMS8E-3.3#PBF
- Part No.:
- LT3663EMS8E-3.3#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3663EMS8E-3.3#PBF.pdf
- Description:
- IC REG BUCK 3.3V 1.2A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:309
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Product details
Overview
LT3663EMS8E-3.3#PBF from Analog Devices (formerly Linear Technology) is a fixed 3.3V, 1.2A step-down switching regulator with programmable output current limit (0.4–1.2A), integrated boost diode, and internal compensation. It operates from 7.5V to 36V input (60V transient tolerant) and delivers regulated power for industrial supplies, automotive battery regulation, and wall transformer applications.
For engineers reviewing the LT3663EMS8E-3.3#PBF datasheet, LT3663EMS8E-3.3#PBF pinout, LT3663EMS8E-3.3#PBF application, or LT3663EMS8E-3.3#PBF equivalent, key selection criteria include its 1.5MHz fixed-frequency peak-current-mode control, 275mV switch VCE(SAT) at 1A, thermal shutdown, and MSOP-8 package with exposed pad for low θJA = 35°C/W.
Technical Context
The LT3663EMS8E-3.3#PBF implements constant-frequency, current-mode control using an internal bipolar NPN power switch driven by a BOOST capacitor-generated voltage > VIN. Its servo-based output current limit circuit compares average inductor current (sensed via ISENSE–VOUT differential) against a voltage set by RILIM on the ILIM pin.
Internal 0.8V reference and fixed-resistor feedback network enable precise 3.3V regulation (±2% over temperature). Input protection includes undervoltage lockout (7.5V rising threshold) and overvoltage lockout (39V typical), allowing safe operation up to 60V transients without switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% over –40°C to 125°C; eliminates external feedback divider. |
| Max Output Current | 1.2A continuous; programmable down to 0.4A via ILIM resistor for system-level power dissipation control. |
| Input Voltage Range | 7.5V to 36V operating; withstands nonrepetitive 60V transients-suitable for unregulated 12V/24V industrial and automotive rails. |
| Switching Frequency | 1.5MHz fixed; enables compact 4.7µH inductor and low-profile ceramic input/output capacitors. |
| Switch VCE(SAT) | 275mV at 1A; reduces conduction loss and improves efficiency at high load currents. |
| Thermal Resistance | θJA = 35°C/W (MSOP-8 with exposed pad); supports 1.2A operation at ambient ≤85°C with minimal heatsinking. |
| Shutdown Current | ≤2µA at VRUN = 0V; enables ultra-low-power standby in battery-backed systems. |
Pinout & Package
LT3663EMS8E-3.3#PBF uses an 8-lead plastic MSOP package (3.0mm × 4.9mm) with exposed thermal pad (Pin 9, GND) requiring PCB soldering for optimal thermal performance (θJA = 35°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input supply | Accepts 7.5–36V; bypassed with ≥1µF X7R ceramic; handles pulsed input current during switching. |
| RUN | Enable/shutdown control | Logic-high ≥2.5V enables regulation; grounded disables IC with ≤2µA quiescent current. |
| FB | Feedback reference node | Internally tied to 0.8V reference; unused in fixed-3.3V version but must be left open or grounded per datasheet. |
| ILIM | Current limit programming | Resistor-to-GND sets average output current limit (e.g., 28.7kΩ = 1.2A); enables system-level thermal management. |
| SW | Switch node | Drives external inductor and catch diode; high dI/dt node requiring short PCB trace and local ground return. |
| BOOST | Bootstrap drive voltage | Generates >VIN gate drive for internal NPN switch via 0.1µF capacitor; critical for low VCE(SAT). |
| ISENSE | Current sense positive input | Connects to inductor output; forms differential pair with VOUT to measure output current for limiting. |
| VOUT | Current sense negative input | Connects to output capacitor negative terminal; completes current-sense path with ISENSE. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diode | Eliminates external Schottky diode in BOOST circuit-reduces BOM count and layout area. |
| Programmable output current limit | 0.4–1.2A range via single ILIM resistor-enables precise thermal design of downstream components (inductor, diode). |
| 60V transient tolerance | Withstands automotive load-dump and industrial surge events without latch-up or damage-no external OVP needed. |
| Thermally enhanced MSOP-8 | Exposed pad and θJA = 35°C/W allow full 1.2A output in space-constrained industrial modules without heatsinks. |
| Internal compensation | Reduces external component count to only inductor, catch diode, input/output caps, and ILIM resistor-simplifies design validation. |
Applications
| Industrial Power Supply | Automotive Battery Regulation |
|---|---|
Use Scenario: Distributed 3.3V rail generation from 24V factory bus with EMI-sensitive PLC I/O modules. IC Role / Device Role / Timing Role: Primary DC/DC converter regulating stable 3.3V for microcontroller, CAN transceiver, and analog front-end. Use Value: 1.5MHz switching minimizes conducted EMI; 60V transient tolerance prevents shutdown during motor-start surges. |
Use Scenario: Post-regulation of vehicle battery (9–16V nominal, up to 36V cranking) for ADAS camera module. IC Role / Device Role / Timing Role: Fixed-output buck regulator delivering clean 3.3V to image sensor and ISP ASIC. Use Value: Programmable 1.2A current limit protects against short-circuit faults in harness wiring; thermal shutdown prevents overheating. |
| Wall Adapter Powered Equipment | Telecom Remote Unit |
Use Scenario: Compact 3.3V supply for PoE-powered IoT gateway using unregulated 12V wall adapter. IC Role / Device Role / Timing Role: High-efficiency step-down regulator converting noisy adapter output to low-noise digital rail. Use Value: 275mV switch VCE(SAT) maintains >85% efficiency at 1A, reducing thermal stress in sealed enclosures. |
Use Scenario: 3.3V local regulation in outdoor telecom node powered from 48V DC plant battery backup. IC Role / Device Role / Timing Role: Secondary regulator providing isolated logic supply for FPGA configuration and monitoring MCU. Use Value: Wide 7.5–36V input range accommodates brownout conditions; shutdown current <2µA extends battery runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1936EDD-3.3#PBF | 36V input, 1.4A output, 500kHz switching, no integrated boost diode, DFN-8 package. | Lacks 60V transient rating and programmable current limit; requires external boost diode and higher BOM count. | Choose when lower switching frequency is acceptable and board space allows external diode placement. |
| LTC3630AEMSE-3.3#PBF | 36V input, 1.2A output, 1.5MHz, integrated MOSFET (not bipolar), no ILIM pin, MSOP-10 package. | Uses MOSFET switch (lower RDS(on)) but lacks programmable current limit and 60V transient tolerance. | Prefer for higher efficiency at light loads; avoid where system-level current limiting or surge immunity is required. |
Compared with LT3663EMS8E-3.3#PBF, LT1936EDD-3.3#PBF offers higher current but less robust surge handling and no current-limit programming, while LTC3630AEMSE-3.3#PBF trades bipolar switch simplicity and fault tolerance for MOSFET efficiency-making LT3663EMS8E-3.3#PBF optimal for thermally constrained, high-reliability industrial designs.
Availability
LT3663EMS8E-3.3#PBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive battery regulation, and wall transformer applications requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 125°C.
Supply support for LT3663EMS8E-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 acquired Linear Technology in 2017 and maintains full product support, manufacturing, and documentation for legacy Linear regulators including the LT3663 family.
The LT3663 product line was designed for rugged, wide-input industrial and automotive DC/DC conversion-emphasizing transient robustness, programmable current limiting, and thermally efficient packaging.
FAQ
What is the maximum input voltage rating for LT3663EMS8E-3.3#PBF?
The LT3663EMS8E-3.3#PBF has an absolute maximum input voltage of 60V for nonrepetitive 1-second transients. Its normal operating input range is 7.5V to 36V. This 60V transient rating enables reliable use in automotive and industrial environments subject to load dump or surge events without requiring external overvoltage protection circuitry.
Does LT3663EMS8E-3.3#PBF require an external feedback resistor divider?
No. The LT3663EMS8E-3.3#PBF is a fixed-output variant with internal resistor divider set for 3.3V regulation. The FB pin is internally connected to the 0.8V reference and does not require external components-simplifying layout and eliminating resistor tolerance errors that affect accuracy in adjustable versions.
How is output current limit programmed on LT3663EMS8E-3.3#PBF?
Output current limit is programmed by connecting a resistor from the ILIM pin to GND. For example, a 28.7kΩ resistor sets the limit to 1.2A. The relationship is linear: 0.4A requires 140kΩ, 0.6A requires 75kΩ, and 1.0A requires 36.5kΩ. This allows precise control of system-level power dissipation and thermal design.
What package type and thermal characteristics does LT3663EMS8E-3.3#PBF use?
The LT3663EMS8E-3.3#PBF uses an 8-lead plastic MSOP package with exposed thermal pad (Pin 9, GND). Its junction-to-ambient thermal resistance is θJA = 35°C/W when properly mounted on a PCB with thermal vias to a solid ground plane-enabling full 1.2A output at ambient temperatures up to 85°C without additional heatsinking.
Can LT3663EMS8E-3.3#PBF operate with input voltage below 7.5V?
No. The LT3663EMS8E-3.3#PBF incorporates undervoltage lockout (UVLO) with a rising threshold of 7.5V (typical) and 500mV hysteresis. Below this threshold, the device remains in shutdown mode with ≤2µA supply current and no switching activity-preventing unstable regulation or excessive dropout in marginal input conditions.
LT3663EMS8E-3.3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) 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):
- 7.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.2A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LT3663EMS8E-3.3#PBF FAQ
1.How can I place an order for LT3663EMS8E-3.3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3663EMS8E-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 LT3663EMS8E-3.3#PBF reliable?
The price and inventory of LT3663EMS8E-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 LT3663EMS8E-3.3#PBF is usually 5 days.
3.What payment methods are accepted for LT3663EMS8E-3.3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3663EMS8E-3.3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3663EMS8E-3.3#PBF?
LT3663EMS8E-3.3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3663EMS8E-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 LT3663EMS8E-3.3#PBF?
For technical support, including LT3663EMS8E-3.3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3663EMS8E-3.3#PBF requirements.
6.How does Aetrix verify that LT3663EMS8E-3.3#PBF is sourced from the original manufacturer or authorized distributors?
All LT3663EMS8E-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 LT3663EMS8E-3.3#PBF meets industry standards.
7.What is the process for return or replacement of LT3663EMS8E-3.3#PBF?
All LT3663EMS8E-3.3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3663EMS8E-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 LT3663EMS8E-3.3#PBF part is unused and in its original packaging.
Return procedure for LT3663EMS8E-3.3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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