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Analog Devices Inc. LT3663IDCB-5#TRPBF
- Part No.:
- LT3663IDCB-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- -
- Datasheet:
-
LT3663IDCB-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1.2A 8DFN
- Quantity:
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Inventory:1,928
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Product details
Overview
LT3663IDCB-5#TRPBF from Analog Devices (formerly Linear Technology) is a 5V fixed-output, 1.2A step-down switching regulator with programmable output current limit (0.4–1.2A), integrated boost diode, and peak current mode control. It operates from 7.5V to 36V input (60V transient tolerant) and delivers regulated 5V at up to 1.2A for industrial power rails and automotive battery regulation.
For engineers reviewing the LT3663IDCB-5#TRPBF datasheet, LT3663IDCB-5#TRPBF pinout, LT3663IDCB-5#TRPBF application, or LT3663IDCB-5#TRPBF equivalent, key selection criteria include its 1.5MHz switching frequency, internal compensation, thermal shutdown, and 8-pin 2mm × 3mm DFN package with exposed GND pad for low θJA = 64°C/W.
Technical Context
The LT3663IDCB-5#TRPBF implements constant-frequency, peak current mode control with an internal 275mV VCE(SAT) NPN switch and integrated boost diode for efficient gate drive. 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.
It features input undervoltage lockout (7.5V rising), overvoltage lockout (39V typical), and thermal shutdown. The fixed 5V output version eliminates external feedback resistors, while internal compensation and a 0.8V reference simplify design. The device supports pulse-skip mode at high VIN/VOUT ratios to maintain regulation under light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.5% (guaranteed over –40°C to 125°C junction temperature) |
| Max Output Current | 1.2A continuous (programmable down to 0.4A via ILIM resistor) |
| Input Voltage Range | 7.5V to 36V operating; withstands nonrepetitive 60V transients |
| Switching Frequency | 1.5MHz typical (fixed, enables compact 6.8µH inductor and ceramic capacitors) |
| Efficiency | Up to 90% at 1A load with VIN = 12V (measured per typical curve TA01b) |
| Thermal Resistance | θJA = 64°C/W (with soldered exposed pad to PCB ground plane) |
| Shutdown Current | ≤2µA (at VRUN = 0V, ensures ultra-low standby power) |
Pinout & Package
LT3663IDCB-5#TRPBF is housed in an 8-lead plastic DFN package (2mm × 3mm) with exposed GND pad (Pin 9), requiring soldering to PCB for thermal and electrical performance. θJA = 64°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 7.5–36V; bypass with ≥2.2µF ceramic capacitor near pin |
| RUN | Enable/shutdown control | Logic-high ≥2.5V enables operation; tie to GND for shutdown (≤2µA IQ) |
| FB | Feedback reference node | Internally connected to 0.8V reference; not used in fixed-5V version (LT3663IDCB-5#TRPBF) |
| ILIM | Current limit programming | Resistor to GND sets output current limit (28.7kΩ = 1.2A per Table 1) |
| BOOST | Internal switch gate drive boost | Connected to cathode of internal boost diode; requires 0.1µF capacitor to SW |
| SW | Switch node | Drives external inductor and catch diode; high dI/dt path requiring short trace |
| ISENSE | Current sense input | Anode of internal boost diode; connects to positive terminal of output current sense resistor |
| VOUT | Regulated output return | Negative terminal of internal current sense resistor; connects to output capacitor negative |
| GND (exposed pad) | Power and signal ground | Pin 9 must be soldered to large PCB ground plane with thermal vias for thermal management |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diode | Eliminates external Schottky diode, reducing BOM count and board area in 5V output designs |
| Programmable output current limit | Enables precise thermal management of downstream components by limiting average inductor current to 0.4–1.2A |
| Fixed 5V output | Removes need for external feedback divider, simplifying layout and improving stability margin |
| 1.5MHz switching frequency | Supports use of small 6.8µH inductors and low-ESR ceramic capacitors for compact, low-profile power solutions |
| 60V transient tolerance | Allows direct connection to unregulated 24V industrial or 12V automotive supplies without external TVS clamping |
Applications
| Industrial Distributed Power | Automotive Battery Regulation |
|---|---|
Use Scenario: Regulating 24V vehicle battery rail to stable 5V for infotainment microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Primary 5V buck converter with transient protection and programmable current limit for fault containment. Use Value: Withstands 60V load-dump transients and limits peak current to protect downstream logic during cold-crank or short-circuit events. | Use Scenario: Providing isolated 5V supply for engine control unit (ECU) sensors and interface ICs in harsh under-hood environments. IC Role / Device Role / Timing Role: High-reliability DC/DC regulator operating across –40°C to 125°C junction temperature range. Use Value: Guaranteed 5V output accuracy and thermal shutdown ensure sensor data integrity and prevent ECU brownouts during thermal stress. |
| Wall Adapter Regulation | Industrial PLC I/O Modules |
Use Scenario: Converting unregulated 12V wall adapter output to clean 5V for USB-powered peripherals and embedded controllers. IC Role / Device Role / Timing Role: Fixed-output step-down regulator with low quiescent current and pulse-skip mode for light-load efficiency. Use Value: Achieves >85% efficiency at 100mA load and <2µA shutdown current, meeting Energy Star standby requirements. | Use Scenario: Generating local 5V rail for digital I/O conditioning circuits in modular programmable logic controller backplanes. IC Role / Device Role / Timing Role: Robust, thermally enhanced power stage delivering 1.2A with minimal external components. Use Value: Use Value: Exposed-pad DFN package and 64°C/W θJA enable reliable operation in convection-cooled enclosures without heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3663EDCB-5#TRPBF | Same silicon, rated for –40°C to 125°C (E-grade), vs. I-grade LT3663IDCB-5#TRPBF also rated –40°C to 125°C but with tighter initial parametric tolerances | E-grade has looser initial VOUT tolerance (±2%) vs. I-grade (±1.5%), identical thermal and transient specs | Select LT3663IDCB-5#TRPBF when guaranteed 5.0V ±1.5% output accuracy across full temperature range is required. |
| LT3493EDD-5#TRPBF | 750kHz switching, 1.4A max, no integrated boost diode, requires external Schottky; different pinout and compensation scheme | Lacks programmable current limit and transient robustness (max VIN = 36V, no 60V rating); lower frequency demands larger magnetics | Choose only if 750kHz operation is preferred and external diode integration is acceptable; not drop-in compatible. |
Compared with LT3663EDCB-5#TRPBF, the LT3663IDCB-5#TRPBF offers tighter output voltage tolerance and higher production test coverage; compared with LT3493EDD-5#TRPBF, it provides integrated boost diode, 60V transient capability, and programmable current limiting-enabling smaller solution size and superior fault containment in industrial and automotive systems.
Availability
LT3663IDCB-5#TRPBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive ECUs, distributed power supplies, and wall adapter-based embedded systems requiring stable component supply with guaranteed long-term availability.
Supply support for LT3663IDCB-5#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, datasheets, and application engineering for legacy Linear parts including the LT3663 family.
The LT3663 product line was designed for high-input-voltage, current-limited step-down regulation in space-constrained industrial and automotive applications where thermal performance, transient robustness, and system-level power control are critical.
FAQ
What is the guaranteed output voltage accuracy of the LT3663IDCB-5#TRPBF over temperature?
The LT3663IDCB-5#TRPBF guarantees 5.0V output with ±1.5% tolerance over its full operating junction temperature range of –40°C to 125°C. This specification is assured by design, characterization, and statistical process controls-not just tested at 25°C-and applies specifically to the I-grade fixed-5V variant.
Does the LT3663IDCB-5#TRPBF require an external feedback resistor network?
No, the LT3663IDCB-5#TRPBF does not require external feedback resistors. As a fixed 5V output version, its internal resistor divider is factory-trimmed to regulate the VOUT pin precisely to 5.0V. The FB pin is internally connected and unused in this variant.
What is the purpose of the ILIM pin on the LT3663IDCB-5#TRPBF, and how is it configured?
The ILIM pin on the LT3663IDCB-5#TRPBF programs the output current limit by connecting a resistor to GND. For the 1.2A maximum output, a 28.7kΩ resistor is used (per Table 1). This sets the average inductor current limit, enabling precise control of system power dissipation and protecting downstream components during overload.
Can the LT3663IDCB-5#TRPBF operate safely with a 48V input transient?
Yes, the LT3663IDCB-5#TRPBF is rated for nonrepetitive 60V transients on the VIN pin. A 48V transient falls within its absolute maximum rating, and its internal overvoltage lockout (39V typical) disables switching to protect the internal switch while sustaining the voltage safely-provided the transient duration is ≤1 second.
What thermal design considerations apply to the LT3663IDCB-5#TRPBF's exposed pad?
The exposed pad (Pin 9) of the LT3663IDCB-5#TRPBF must be soldered to a large PCB ground plane with multiple thermal vias to achieve the specified θJA = 64°C/W. Failure to do so will cause excessive junction temperature rise, potentially triggering thermal shutdown or reducing lifetime. The pad is electrically GND and serves both thermal and grounding functions.
LT3663IDCB-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
LT3663IDCB-5#TRPBF FAQ
1.How can I place an order for LT3663IDCB-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3663IDCB-5#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 LT3663IDCB-5#TRPBF reliable?
The price and inventory of LT3663IDCB-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3663IDCB-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3663IDCB-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3663IDCB-5#TRPBF transactions.
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4.How is shipping managed for LT3663IDCB-5#TRPBF?
LT3663IDCB-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3663IDCB-5#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 LT3663IDCB-5#TRPBF?
For technical support, including LT3663IDCB-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3663IDCB-5#TRPBF requirements.
6.How does Aetrix verify that LT3663IDCB-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3663IDCB-5#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 LT3663IDCB-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3663IDCB-5#TRPBF?
All LT3663IDCB-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3663IDCB-5#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 LT3663IDCB-5#TRPBF part is unused and in its original packaging.
Return procedure for LT3663IDCB-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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