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Analog Devices Inc. LT3663IMS8E-3.3#TRPBF
- Part No.:
- LT3663IMS8E-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3663IMS8E-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 1.2A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,297
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Product details
Overview
LT3663IMS8E-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a fixed 3.3V, 1.2A step-down switching regulator with programmable output current limit, wide 7.5V–36V input range, integrated boost diode, and internal compensation - designed for automotive battery regulation, industrial supplies, and wall transformer applications requiring robust transient protection up to 60V.
For engineers reviewing the LT3663IMS8E-3.3#TRPBF datasheet, LT3663IMS8E-3.3#TRPBF pinout, LT3663IMS8E-3.3#TRPBF application, or LT3663IMS8E-3.3#TRPBF equivalent, key selection criteria include its 1.5MHz fixed-frequency 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 LT3663IMS8E-3.3#TRPBF implements constant-frequency peak current-mode control with internal slope compensation and an integrated bipolar NPN power switch. Its servo-based output current limit circuit uses external RILIM to set average inductor current between 0.4A and 1.2A, enabling precise system-level power dissipation control without overrating passive components.
It features dual protection architecture: input undervoltage lockout (7.5V rising threshold) and overvoltage lockout (39V typical), allowing safe operation under 60V nonrepetitive transients. The BOOST pin generates gate drive voltage > VIN via internal diode and external capacitor, ensuring full switch saturation for high efficiency across the input range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% (3.234V–3.366V), internally trimmed - eliminates external feedback resistors and improves accuracy vs. resistor-divider solutions. |
| Max Output Current | 1.2A continuous, programmable down to 0.4A via ILIM pin - enables scalable power delivery and thermal management in space-constrained designs. |
| Input Voltage Range | 7.5V to 36V operating, 60V transient survival - supports unregulated 12V/24V industrial rails and automotive cold-crank conditions. |
| Switching Frequency | 1.5MHz fixed (LT3663 variant), enabling compact LC filter design with ≤4.7µH inductors and minimal board area. |
| Switch VCE(SAT) | 275mV at 1A - reduces conduction loss and improves efficiency at high load currents compared to MOSFET-based alternatives with higher RDS(on). |
| Thermal Resistance | θJA = 35°C/W (MSOP-8 with exposed pad) - allows 1.2A operation up to +85°C ambient without forced airflow or heatsinking. |
| Shutdown Current | ≤2µA at VRUN = 0V - supports ultra-low-power standby modes in battery-backed systems. |
Pinout & Package
LT3663IMS8E-3.3#TRPBF is housed in an 8-lead plastic MSOP package (3.00mm × 3.00mm × 1.10mm) with exposed thermal pad (Pin 9, GND). The exposed pad must be soldered to a PCB ground plane with ≥4 thermal vias for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies internal regulator and switch; accepts 7.5V–36V with 60V transient tolerance - requires local 4.7µF ceramic bypass. |
| RUN | Enable/shutdown control | Logic-high (>2.5V) enables regulation; grounded disables IC with <2µA quiescent current - supports system-level power sequencing. |
| FB | Feedback reference node | Internally connected to 0.8V reference; not accessible on fixed-output versions - eliminates external resistor divider errors and layout sensitivity. |
| ILIM | Current limit programming | Resistor-to-GND sets average output current (e.g., 28.7kΩ = 1.2A); enables dynamic current limiting without changing inductor/diode ratings. |
| SW | Switch node | Drives external inductor; carries high di/dt pulsed current - requires short, low-inductance trace to minimize EMI and voltage spikes. |
| BOOST | Bootstrap gate drive | Generates >VIN voltage for switch saturation via internal diode + 0.1µF capacitor - critical for maintaining efficiency at high duty cycles. |
| ISENSE | Current sense input | Positive terminal of internal current-sense resistor; also anode of internal boost diode - ties directly to inductor output and catch diode cathode. |
| VOUT | Regulated output | Fixed 3.3V output; connects to load and output capacitor - requires ≥22µF low-ESR ceramic for stable regulation and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diode | Eliminates external Schottky diode, reducing BOM count and PCB area while maintaining >90% efficiency at 1A. |
| Programmable output current limit | 0.4A–1.2A via single resistor - protects downstream components during overload/short-circuit without sacrificing normal operation. |
| Internal compensation | Reduces external component count to only inductor, input/output capacitors, boost cap, and ILIM resistor - accelerates design cycle. |
| 60V transient survivability | Withstands automotive load-dump events and industrial surge transients without latch-up or damage - no external TVS required. |
| Thermally enhanced MSOP-8 | 35°C/W junction-to-ambient enables full 1.2A output at +85°C ambient - outperforms DFN packages in thermally constrained enclosures. |
Applications
| Automotive Battery Regulation | Industrial 24V Supply Regulation |
|---|---|
|
Use Scenario: Powering infotainment microcontrollers and CAN transceivers from a 12V/24V vehicle battery subject to cold-crank (down to 4.5V) and load-dump (up to 60V) transients. IC Role / Device Role / Timing Role: Primary 3.3V point-of-load regulator providing stable, current-limited power with built-in OVP/UVP and thermal shutdown. Use Value: Eliminates need for external transient suppressors and discrete current-limit circuits - reduces solution size by >30% vs. discrete buck + protection. |
Use Scenario: Converting unregulated 24V industrial rail to 3.3V for PLC I/O modules and sensor interfaces operating in harsh, high-temperature environments. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter delivering 1.2A with programmable current limit to prevent bus fault propagation. Use Value: Maintains regulation across 7.5V–36V input range and sustains full load at +85°C ambient - avoids derating or forced cooling. |
| Wall Transformer Regulation | Distributed Supply Regulation |
|
Use Scenario: Regulating noisy, unregulated 12V AC/DC wall adapter output to clean 3.3V for embedded networking devices (e.g., PoE-powered switches). IC Role / Device Role / Timing Role: High-efficiency step-down regulator with integrated boost diode and 1.5MHz switching for small form factor. Use Value: Achieves >90% efficiency at 1A with only 4.7µH inductor and 22µF output cap - enables compact, fanless enclosure design. |
Use Scenario: Local 3.3V supply for FPGA I/O banks or high-speed ADCs in multi-rail systems where centralized PSUs lack per-rail current limiting. IC Role / Device Role / Timing Role: Standalone current-limited regulator enabling independent fault containment and thermal management per subsystem. Use Value: Programmable ILIM prevents single-point failure from propagating across distributed loads - enhances system reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3434EDD#TRPBF | 60V input, 2.4A output, 200kHz switching, external diode required | Better suited for higher-current, lower-frequency designs with larger inductors; lacks integrated boost diode and programmable current limit | Select when >1.2A output or 200kHz operation is required; accept added BOM and layout complexity. |
| LTC3632EMSE#TRPBF | 36V input, 1.2A output, 1.5MHz, integrated MOSFET, no programmable current limit | Uses MOSFET switch (lower RDS(on)) but lacks current-limit programming and 60V transient rating | Prefer for efficiency-critical 3.3V/1.2A apps with clean input; avoid if load-dump protection or adjustable current limit is needed. |
Compared with LT3434EDD#TRPBF and LTC3632EMSE#TRPBF, the LT3663IMS8E-3.3#TRPBF uniquely combines 60V transient survival, programmable current limiting, and integrated boost diode in a thermally optimized MSOP-8 - making it optimal for ruggedized 3.3V point-of-load regulation where reliability and simplicity are prioritized over raw efficiency or ultra-high current.
Availability
LT3663IMS8E-3.3#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial 24V supply regulation, and wall transformer regulation requiring stable component supply and long-term production continuity.
Supply support for LT3663IMS8E-3.3#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LT3663 family.
The LT3663 series was designed as a rugged, easy-to-use step-down regulator for industrial and automotive applications demanding wide input range, transient resilience, and precise current limiting - targeting designers needing reliable 3.3V/5V conversion without complex compensation or external protection.
FAQ
What is the maximum input voltage the LT3663IMS8E-3.3#TRPBF can withstand?
The LT3663IMS8E-3.3#TRPBF operates continuously from 7.5V to 36V and safely withstands nonrepetitive 1-second transients up to 60V due to its integrated input overvoltage lockout circuit, which disables switching above 39V (typical) while sustaining the full 60V stress on VIN and RUN pins - a key feature for automotive and industrial environments.
Does the LT3663IMS8E-3.3#TRPBF require external compensation components?
No, the LT3663IMS8E-3.3#TRPBF is internally compensated, requiring only five external components: input capacitor, output capacitor, inductor, boost capacitor, and ILIM resistor. This eliminates loop compensation design effort and ensures stability across all operating conditions without tuning - verified by Linear Technology's internal pole-zero placement on the VC node.
How is the output current limit set on the LT3663IMS8E-3.3#TRPBF?
The output current limit on the LT3663IMS8E-3.3#TRPBF is set by connecting a resistor from the ILIM pin to GND. For example, a 28.7kΩ resistor programs a 1.2A limit, while 48.7kΩ sets 0.8A. The relationship is linear and specified in Table 1 of the datasheet, enabling precise control of average inductor current to manage thermal stress and system power dissipation.
Can the LT3663IMS8E-3.3#TRPBF be used with a 24V input to deliver 3.3V at 1.2A?
Yes, the LT3663IMS8E-3.3#TRPBF is fully rated for 24V input and delivers 3.3V at 1.2A continuously. At VIN = 24V, typical efficiency exceeds 88%, and thermal performance remains within spec (TJ < 125°C) using the MSOP-8's exposed pad with standard PCB copper area - confirmed by Figure TA06 efficiency curves and thermal resistance data.
What is the purpose of the BOOST pin on the LT3663IMS8E-3.3#TRPBF?
The BOOST pin on the LT3663IMS8E-3.3#TRPBF provides a gate-drive voltage higher than VIN to fully saturate the internal bipolar NPN power switch. It is charged via the internal boost diode and an external 0.1µF capacitor, ensuring low 275mV VCE(SAT) at 1A - critical for maintaining high efficiency, especially at high input voltages and duty cycles.
LT3663IMS8E-3.3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-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:
- 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
LT3663IMS8E-3.3#TRPBF FAQ
1.How can I place an order for LT3663IMS8E-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3663IMS8E-3.3#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 LT3663IMS8E-3.3#TRPBF reliable?
The price and inventory of LT3663IMS8E-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3663IMS8E-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3663IMS8E-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3663IMS8E-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3663IMS8E-3.3#TRPBF?
LT3663IMS8E-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3663IMS8E-3.3#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 LT3663IMS8E-3.3#TRPBF?
For technical support, including LT3663IMS8E-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3663IMS8E-3.3#TRPBF requirements.
6.How does Aetrix verify that LT3663IMS8E-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3663IMS8E-3.3#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 LT3663IMS8E-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3663IMS8E-3.3#TRPBF?
All LT3663IMS8E-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3663IMS8E-3.3#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 LT3663IMS8E-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LT3663IMS8E-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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