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Analog Devices Inc. LT3663EDCB#TRMPBF
- Part No.:
- LT3663EDCB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3663EDCB#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:546
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Product details
Overview
LT3663EDCB#TRMPBF from Analog Devices (formerly Linear Technology) is a 1.5MHz fixed-frequency, current-mode step-down switching regulator with programmable output current limit (0.4A–1.2A), integrated boost diode, and internal compensation. It operates from 7.5V to 36V input (60V transient tolerant) and delivers up to 1.2A at fixed 5V output in an 8-lead 2mm × 3mm DFN package with exposed thermal pad. Used in automotive battery regulation and industrial 24V supply conversion.
For engineers reviewing the LT3663EDCB#TRMPBF datasheet, LT3663EDCB#TRMPBF pinout, LT3663EDCB#TRMPBF application, or LT3663EDCB#TRMPBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal performance (θJA = 64°C/W), real-world efficiency curves (≥90% at 1A, VIN=15V), and precise alternative part comparisons for automotive and industrial DC/DC design.
Technical Context
The LT3663EDCB#TRMPBF implements peak current-mode control with a 1.5MHz oscillator, enabling compact external components and stable regulation under wide input transients. Its internal bipolar NPN switch features low VCE(SAT) (275mV @ 1A) and is driven via an integrated boost circuit that elevates gate drive above VIN using an internal diode and external capacitor.
Output current limiting is implemented via servo-controlled average-current sensing: the ILIM pin accepts a resistor to ground (e.g., 28.7kΩ for 1.0A limit), and amplifier G2 compares the averaged ISENSE voltage against this reference. The device includes independent UVLO (7.5V rising) and OVLO (39V typical) with 1V hysteresis, thermal shutdown, and low-quiescent shutdown current (≤2µA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 36V continuous; withstands nonrepetitive 60V transients - enables direct use with unregulated 12V/24V sources and automotive batteries. |
| Switching Frequency | 1.5MHz (fixed) - allows use of small inductors (e.g., 3.3µH–6.8µH) and ceramic capacitors without subharmonic instability. |
| Output Current Limit | Programmable 0.4A to 1.2A via ILIM resistor - replaces discrete current-limiting circuits and reduces power path component stress. |
| Fixed Output Voltage | 5.0V ±1.5% (VFB = 800mV, internal divider) - eliminates external feedback resistors and improves accuracy over temperature. |
| Thermal Resistance | θJA = 64°C/W (DCB package, exposed pad soldered) - supports 1.2A operation up to +85°C ambient with minimal heatsinking. |
| Shutdown Current | ≤2µA at VRUN = 0V - enables ultra-low-power system sleep modes without external load switches. |
| Switch VCE(SAT) | 275mV at 1A - minimizes conduction loss and improves full-load efficiency (>90% at 1A, VIN=15V). |
Pinout & Package
LT3663EDCB#TRMPBF uses the 8-lead (2mm × 3mm) plastic DFN package (DCB) with exposed thermal pad (Pin 9, GND). The exposed pad must be soldered to a PCB ground plane with thermal vias for reliable 1.2A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies internal regulator and switch; bypass with ≥1µF X7R ceramic; handles 60V transients. |
| RUN | Enable/shutdown control | Logic-high (≥2.5V) enables regulation; grounded forces <2µA shutdown; tie to VIN if unused. |
| FB | Feedback reference node | Regulated to 800mV; internal resistor divider sets 5V output - no external resistors required. |
| ILIM | Current limit programming | Resistor to GND sets average output current limit (e.g., 28.7kΩ = 1.0A); tolerance directly affects limit accuracy. |
| SW | Switch node | Connects to inductor, catch diode cathode, and boost capacitor; carries high di/dt pulsed current. |
| BOOST | Boost capacitor connection | Provides >VIN gate drive for internal NPN switch; requires 0.1µF ceramic capacitor to SW. |
| ISENSE | Current sense input | Positive input to internal current-sense resistor; also anode of internal boost diode. |
| VOUT | Output return | Negative terminal of internal current-sense resistor; connects to output capacitor negative and load ground. |
| GND (exposed pad) | Power and signal ground | Pins 1–8 substrate ground and thermal path; exposed pad (Pin 9) must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diode | Eliminates external Schottky diode for BOOST generation - reduces BOM count and layout area in 5V-output designs. |
| Internal compensation | Removes need for external Type-II/III compensation network - simplifies design and improves stability across line/load/temperature. |
| Programmable current limit | Enables precise system-level power dissipation control - allows smaller inductors, diodes, and PCB traces without derating. |
| 60V transient protection | OVLO clamps switching at 39V (typical), allowing safe operation with 60V surges - critical for automotive cold-crank and load-dump immunity. |
| Thermally enhanced DFN | 64°C/W junction-to-ambient enables 1.2A continuous output at +85°C ambient - avoids need for heatsinks or airflow in enclosed enclosures. |
Applications
| Automotive Battery Regulation | Industrial 24V Supply Conversion |
|---|---|
Use Scenario: Regulating raw vehicle battery (9V–16V nominal, up to 60V transients) to stable 5V for infotainment microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Primary buck converter with transient-hardened input stage and programmable current limit for fault containment. Use Value: Withstands ISO 7637-2 pulse 5a (75V/100ms) without latch-off; 1.2A limit protects downstream logic during short-circuit events. | Use Scenario: Converting 24V factory floor power to 5V for PLC I/O modules and sensor interface circuitry operating in high-noise environments. IC Role / Device Role / Timing Role: High-efficiency, low-EMI DC/DC front-end with fixed 5V output and robust thermal management. Use Value: 90%+ efficiency at 1A reduces heat buildup in sealed DIN-rail enclosures; 1.5MHz switching avoids AM radio band interference. |
| Wall Transformer Regulation | Distributed Power Architecture |
Use Scenario: Replacing linear regulators in AC/DC wall adapters supplying 5V to USB-powered industrial gateways and edge AI sensors. IC Role / Device Role / Timing Role: Compact, high-density step-down regulator replacing inefficient 7805-style solutions. Use Value: 2mm × 3mm DFN footprint saves >60% board area vs. TO-220 linear regulators; 1.5MHz frequency enables <10mm² total solution size. | Use Scenario: Local point-of-load regulation on dense backplanes where 12V or 24V intermediate bus powers multiple 5V subsystems. IC Role / Device Role / Timing Role: Isolated, current-limited POL converter with fast transient response for FPGA I/O banks and memory interfaces. Use Value: Programmable 1.0A limit prevents bus collapse during simultaneous rail startup; internal compensation ensures stability with 22µF ceramic output caps. |
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 | Identical electrical specs and pinout; same 5V fixed output; differs only in tape-and-reel packaging (TRPBF vs TRMPBF) and marking (LFMY vs LDVK). | No functional difference; both rated –40°C to 125°C; TRMPBF uses 500-piece reel, TRPBF uses 2500-piece reel. | Select TRMPBF for prototyping and low-volume production; TRPBF for high-volume automated assembly. |
| LT3663IMS8E-5#TRPBF | Same 5V fixed output and current limit range, but in 8-lead MSOP package (θJA = 35°C/W); higher thermal performance but larger footprint (3mm × 3mm). | Better thermal headroom for 1.2A at +105°C ambient; MSOP exposes more copper for manual rework but increases board area by ~2.5×. | Choose MSOP version when ambient exceeds 85°C or when thermal vias in DFN layout are impractical. |
Compared with LT3663EDCB-5#TRPBF, the LT3663EDCB#TRMPBF offers identical regulation performance in a smaller reel format ideal for evaluation and pilot builds; versus LT3663IMS8E-5#TRPBF, it trades thermal margin for space savings - making it optimal for space-constrained automotive and industrial modules where board area is premium.
Availability
LT3663EDCB#TRMPBF 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 guaranteed traceability.
Supply support for LT3663EDCB#TRMPBF 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 the LT3663 family.
The LT3663 product line was designed for rugged, high-input-voltage DC/DC conversion in automotive, industrial, and telecom infrastructure - emphasizing transient tolerance, programmable current limiting, and thermally efficient DFN packaging.
FAQ
What is the maximum input voltage rating for the LT3663EDCB#TRMPBF?
The LT3663EDCB#TRMPBF has an absolute maximum input voltage rating of 60V for nonrepetitive 1-second transients. Continuous operation is specified from 7.5V to 36V. Its overvoltage lockout activates at 39V (typical), disabling switching to protect downstream components while sustaining the 60V surge - a key requirement for automotive load-dump immunity per ISO 7637-2.
Does the LT3663EDCB#TRMPBF require external compensation components?
No, the LT3663EDCB#TRMPBF is internally compensated. Its control loop uses a fixed pole-zero combination on the VC node, eliminating the need for external Type-II or Type-III compensation networks. This simplifies layout, reduces BOM cost, and ensures stable operation across all operating conditions - including full load, light load, and temperature extremes - when used with recommended output capacitors (≥22µF ceramic).
How is the output current limit set on the LT3663EDCB#TRMPBF?
The output current limit on the LT3663EDCB#TRMPBF is set by connecting a resistor from the ILIM pin to GND. For example, a 28.7kΩ resistor programs a 1.0A limit (±10%), while 36.5kΩ yields 0.8A. The relationship is inverse and linear per Table 1 in the datasheet. This average-current limit actively regulates inductor current to prevent overheating of external components during overload or short-circuit conditions.
What package type and thermal characteristics does the LT3663EDCB#TRMPBF use?
The LT3663EDCB#TRMPBF uses the 8-lead 2mm × 3mm plastic DFN (DCB) package with exposed thermal pad (Pin 9). Its junction-to-ambient thermal resistance is 64°C/W when the exposed pad is properly soldered to a PCB ground plane with thermal vias. This enables 1.2A continuous output at +85°C ambient without forced air cooling - verified in the Typical Performance Characteristics section of the datasheet.
Is the LT3663EDCB#TRMPBF pin-compatible with other versions in the LT3663 family?
Yes, the LT3663EDCB#TRMPBF is pin-compatible with all other DCB-package variants (e.g., LT3663EDCB-3.3#TRPBF, LT3663IDCB#TRPBF) and shares identical pinout, package dimensions, and thermal pad configuration. Differences are limited to output voltage (3.3V/5V), temperature grade (E/I/H), and packaging (TRMPBF vs TRPBF). No PCB redesign is needed when substituting within the DCB family.
LT3663EDCB#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 7.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 1.2A
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
LT3663EDCB#TRMPBF FAQ
1.How can I place an order for LT3663EDCB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3663EDCB#TRMPBF 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#TRMPBF reliable?
The price and inventory of LT3663EDCB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3663EDCB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3663EDCB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3663EDCB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3663EDCB#TRMPBF?
LT3663EDCB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3663EDCB#TRMPBF 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#TRMPBF?
For technical support, including LT3663EDCB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3663EDCB#TRMPBF requirements.
6.How does Aetrix verify that LT3663EDCB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3663EDCB#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3663EDCB#TRMPBF?
All LT3663EDCB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3663EDCB#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LT3663EDCB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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