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Analog Devices Inc. LT3663EDCB-5#TRPBF
- Part No.:
- LT3663EDCB-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- -
- Datasheet:
-
LT3663EDCB-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1.2A 8DFN
- Quantity:
- Payment:
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Inventory:4,957
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Product details
Overview
LT3663EDCB-5#TRPBF from Analog Devices (formerly Linear Technology) is a 5V fixed-output, 1.2A step-down switching regulator with programmable output current limit and integrated boost diode. It operates from 7.5V to 36V input (60V transient tolerant), features 1.5MHz fixed-frequency peak-current-mode control, and delivers up to 1.2A with 275mV switch VCE(SAT) at 1A - ideal for automotive battery regulation and industrial 24V supply conversion.
For engineers reviewing the LT3663EDCB-5#TRPBF datasheet, LT3663EDCB-5#TRPBF pinout, LT3663EDCB-5#TRPBF application, or LT3663EDCB-5#TRPBF equivalent, key selection criteria include its 5V fixed output, 0.4–1.2A programmable current limit via ILIM resistor, thermal shutdown, input overvoltage/undervoltage lockout, and thermally enhanced 8-lead 2mm × 3mm DFN package with exposed GND pad.
Technical Context
The LT3663EDCB-5#TRPBF implements constant-frequency peak-current-mode control with internal compensation and an integrated bipolar NPN power switch. Its BOOST pin generates a voltage >VIN via an internal diode and external capacitor to ensure full switch saturation, enabling high efficiency across wide input ranges.
It integrates input UVLO (7.5V rising), OVLO (39V typical), thermal shutdown, and a dedicated ISENSE pin for accurate average output current limiting. The fixed 5V output version eliminates external feedback resistors, while the ILIM pin accepts a resistor to set current limit from 0.4A to 1.2A with ±10% accuracy over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.5% (guaranteed over –40°C to 125°C junction temp) |
| Max Output Current | 1.2A continuous (programmable down to 0.4A via ILIM resistor) |
| Input Voltage Range | 7.5V to 36V operating; withstands non-repetitive 60V transients |
| Switching Frequency | 1.5MHz typical (±10% variation); enables compact 6.8µH inductor and low-profile layout |
| Switch VCE(SAT) | 275mV at 1A load - reduces conduction loss and improves efficiency at medium loads |
| Thermal Resistance θJA | 64°C/W (DFN package with soldered exposed pad) - supports 1.2A operation at ≤85°C ambient |
| Shutdown Current | ≤2µA at VRUN = 0V - enables ultra-low-power system standby modes |
Pinout & Package
LT3663EDCB-5#TRPBF uses an 8-lead plastic DFN package (2mm × 3mm) with exposed GND pad (Pin 9), requiring PCB soldering for thermal and electrical integrity. Package outline complies with LTC DWG #05-08-1718 Rev A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies internal regulator and switch; bypass with ≥1µF ceramic capacitor close to pin |
| RUN | Enable/disable control | Tie ≥2.5V for operation; ground for shutdown (0.01–2µA bias current) |
| FB | Feedback reference | Internally tied to 0.8V reference; not accessible in fixed-5V version (LT3663EDCB-5#TRPBF) |
| ILIM | Current limit programming | Resistor to GND sets output current limit (28.7kΩ = 1.2A; 75kΩ = 0.6A per Table 1) |
| BOOST | Switch gate drive booster | Connects to SW via external 0.1µF capacitor; must be >2.3V above SW for optimal efficiency |
| SW | Switch node | Drives external inductor and catch diode; high dI/dt node requiring short, low-inductance 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 | Must be soldered to large PCB ground plane with thermal vias; primary thermal path |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diode | Eliminates external Schottky diode for BOOST circuit - reduces BOM count and layout area |
| Programmable output current limit | 0.4A–1.2A range via single ILIM resistor - enables precise power dissipation control and smaller passive sizing |
| 60V transient tolerance | Withstands automotive load-dump events without external clamping - simplifies front-end protection |
| Internal compensation | Single VC node compensation - removes need for external loop compensation components |
| Thermally enhanced DFN | 64°C/W θJA with exposed pad - supports full 1.2A output at 85°C ambient without heatsink |
Applications
| Automotive Battery Regulation | Industrial 24V Supply Conversion |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery (with 60V load-dump transients) to stable 5V for infotainment microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 5V with current-limited fault protection during short-circuit conditions. Use Value: 60V transient tolerance avoids need for TVS clamping; programmable 1.2A limit protects downstream logic during ECU brown-out recovery. |
Use Scenario: Converting unregulated 24V factory-floor power to clean 5V for PLC I/O modules and sensor interface circuitry. IC Role / Device Role / Timing Role: Fixed-output DC/DC stage providing isolated 5V rail with tight current limiting to prevent bus collapse during field-device faults. Use Value: 7.5–36V input range accommodates brown-outs and surges; 1.5MHz switching minimizes EMI in noise-sensitive control cabinets. |
| Wall Transformer Regulation | Distributed Supply Regulation |
Use Scenario: Down-converting noisy 12V wall adapter output to low-noise 5V for USB-powered test equipment and portable instrumentation. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with low quiescent current in shutdown mode. Use Value: ≤2µA shutdown current extends battery backup time; 275mV VCE(SAT) maintains >90% efficiency at 500mA load. |
Use Scenario: Providing localized 5V rails across multi-board embedded systems where centralized PSUs lack granularity. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator placed near FPGA or SoC power domains. Use Value: 2mm × 3mm DFN footprint saves board space; exposed pad enables direct thermal coupling to copper pour on dense PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3663IMS8E-5#TRPBF | Same IC die, but in 8-lead MSOP package with θJA = 35°C/W and –40°C to 125°C rating | Better thermal performance in low-airflow environments; larger footprint than DFN | Select when board layout allows MSOP and lower thermal resistance is prioritized over size |
| LT3434EFE#TRPBF | 60V-input, 2.4A buck with 200kHz fSW, no integrated boost diode, requires external FB divider | Higher voltage/current capability but needs more external components and larger magnetics | Choose for 36–60V input designs needing >1.2A or where lower switching frequency eases EMI filtering |
Compared with LT3663IMS8E-5#TRPBF, the LT3663EDCB-5#TRPBF offers 40% smaller footprint and identical electrical specs but higher thermal resistance; versus LT3434EFE#TRPBF, it trades maximum input voltage and current for integration, size, and ease of use in 12V/24V systems.
Availability
LT3663EDCB-5#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial 24V supply conversion, and wall transformer regulation requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.
Supply support for LT3663EDCB-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 its high-performance analog and power management portfolio with rigorous qualification standards.
The LT3663 product line targets rugged, high-voltage DC/DC conversion in automotive, industrial, and telecom infrastructure - emphasizing transient robustness, current-limit precision, and minimal external component count.
FAQ
What is the output voltage tolerance of the LT3663EDCB-5#TRPBF?
The LT3663EDCB-5#TRPBF provides a fixed 5.0V output with ±1.5% tolerance over the full –40°C to 125°C junction temperature range and line/load conditions specified in the datasheet. This is achieved via laser-trimmed internal feedback resistors, eliminating external resistor errors and drift.
Does the LT3663EDCB-5#TRPBF require an external feedback resistor divider?
No - the LT3663EDCB-5#TRPBF is the fixed 5V output variant, so the feedback divider is fully internal. The FB pin is not accessible or required for configuration. Only adjustable versions (e.g., LT3663EDCB#TRPBF) use external resistors.
How is output current limit programmed on the LT3663EDCB-5#TRPBF?
Output current limit is set by connecting a resistor from the ILIM pin to GND. For LT3663EDCB-5#TRPBF, a 28.7kΩ resistor yields 1.2A limit; 75kΩ gives 0.6A. Values are validated per Table 1 in the datasheet and maintain ±10% accuracy across temperature.
What is the purpose of the BOOST pin on the LT3663EDCB-5#TRPBF?
The BOOST pin supplies elevated gate drive voltage to the internal bipolar NPN switch, ensuring full saturation and low VCE(SAT). It's charged via an external 0.1µF capacitor and the internal boost diode connected to ISENSE - no external diode needed.
Can the LT3663EDCB-5#TRPBF operate with input voltage below 7.5V?
No - the LT3663EDCB-5#TRPBF has a guaranteed undervoltage lockout (UVLO) threshold of 7.5V (rising). Operation below this voltage is not functional or characterized; attempting to power it below 7.5V will keep the device in shutdown state.
LT3663EDCB-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:
- -
LT3663EDCB-5#TRPBF FAQ
1.How can I place an order for LT3663EDCB-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3663EDCB-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 LT3663EDCB-5#TRPBF reliable?
The price and inventory of LT3663EDCB-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 LT3663EDCB-5#TRPBF is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3663EDCB-5#TRPBF transactions.
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4.How is shipping managed for LT3663EDCB-5#TRPBF?
LT3663EDCB-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3663EDCB-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 LT3663EDCB-5#TRPBF?
For technical support, including LT3663EDCB-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3663EDCB-5#TRPBF requirements.
6.How does Aetrix verify that LT3663EDCB-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3663EDCB-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 LT3663EDCB-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3663EDCB-5#TRPBF?
All LT3663EDCB-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3663EDCB-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 LT3663EDCB-5#TRPBF part is unused and in its original packaging.
Return procedure for LT3663EDCB-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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