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Analog Devices Inc. LT3663EDCB-3.3#TRMPBF
- Part No.:
- LT3663EDCB-3.3#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3663EDCB-3.3#TRMPBF.pdf
- Description:
- IC REG BUCK 3.3V 1.2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,758
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Product details
Overview
LT3663EDCB-3.3#TRMPBF from Analog Devices (formerly Linear Technology) is a 3.3V 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 3.3V at up to 1.2A in automotive battery regulation and industrial 24V supply conversion.
For engineers reviewing the LT3663EDCB-3.3#TRMPBF datasheet, LT3663EDCB-3.3#TRMPBF pinout, LT3663EDCB-3.3#TRMPBF application, or LT3663EDCB-3.3#TRMPBF equivalent, key selection criteria include its 1.5MHz switching frequency, internal compensation, 275mV switch VCE(SAT) at 1A, thermal shutdown, and exposed-pad DFN package for low thermal resistance.
Technical Context
The LT3663EDCB-3.3#TRMPBF implements constant-frequency (1.5MHz), peak current mode control with an internal bipolar NPN power switch and integrated boost diode for gate drive above VIN. 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 dual protection architecture: input overvoltage lockout (36–41V rising threshold) and undervoltage lockout (7–7.5V rising), plus thermal shutdown and low-current shutdown mode (<2µA). The device is internally compensated and requires no external loop components beyond the standard buck layout (inductor, catch diode, input/output capacitors).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% (3.234V–3.366V), eliminating need for external feedback resistors. |
| Max Output Current | 1.2A continuous, limited by internal current-sense amplifier and external RILIM. |
| Input Voltage Range | 7.5V to 36V operating; withstands non-repetitive 60V transients without damage. |
| Switching Frequency | 1.5MHz typical, enabling compact magnetics and fast transient response. |
| Switch VCE(SAT) | 275mV at 1A, minimizing conduction loss and improving efficiency at high load. |
| Thermal Resistance θJA | 64°C/W (DCB package), achieved via exposed GND pad soldered to PCB ground plane. |
| Shutdown Current | <2µA when RUN pin pulled low, supporting ultra-low-power standby modes. |
Pinout & Package
LT3663EDCB-3.3#TRMPBF is housed in an 8-lead (2mm × 3mm) plastic DFN package with exposed GND pad (Pin 9), requiring soldering to PCB for thermal and electrical performance. Package outline complies with LTC DWG #05-08-1718 Rev A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input power supply connection | Accepts 7.5–36V; bypassed with ≥1µF ceramic capacitor near pin to suppress high-frequency switching noise. |
| RUN | Enable/shutdown control input | Logic-high (≥2.5V) enables regulation; logic-low (≤0.3V) disables switching and reduces quiescent current to <2µA. |
| FB | Feedback reference node | Internally tied to 0.8V reference; not accessible on fixed-output versions - internal resistor divider sets 3.3V output. |
| ILIM | Current limit programming input | Connects to GND via resistor (e.g., 28.7kΩ for 1.0A limit); sets average output current with ±10% accuracy over temperature. |
| BOOST | Bootstrap drive voltage node | Supplies >VIN voltage to switch driver via internal diode and external 0.1µF capacitor; must exceed SW by >2.3V for full saturation. |
| SW | Switch node | Drives external inductor and catch diode; carries high di/dt pulsed current - requires short, low-inductance PCB trace. |
| ISENSE | Current sense positive input | Connects to cathode of internal boost diode and positive terminal of internal current-sense resistor; used for output current limiting. |
| VOUT | Regulated output terminal | Delivers 3.3V to load; connects to negative terminal of internal current-sense resistor and output capacitor. |
| GND (exposed pad) | Power and signal ground | Exposed Pad Pin 9 must be soldered to large PCB ground plane with multiple thermal vias for thermal management and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diode | Eliminates external Schottky diode for bootstrap capacitor charging, reducing BOM count and board area. |
| Programmable output current limit | Enables precise system-level power budgeting and protects downstream components during overload or short-circuit events. |
| 60V transient tolerance | Allows direct use in automotive cold-crank (up to 60V) and industrial 24V systems without external TVS clamping. |
| Internal compensation | Removes need for external compensation network, simplifying design and improving stability across load/line variations. |
| Thermally enhanced DFN | 2mm × 3mm footprint with exposed GND pad achieves 64°C/W θJA, enabling 1.2A operation in compact space-constrained designs. |
Applications
| Automotive Battery Regulation | Industrial 24V Supply Conversion |
|---|---|
Use Scenario: Regulating unregulated 12V/24V vehicle battery rail (including cold-crank transients up to 60V) to stable 3.3V for microcontrollers and sensors. IC Role / Device Role / Timing Role: Primary DC/DC step-down regulator with current-limit protection and transient robustness. Use Value: Delivers 1.2A at 3.3V while surviving 60V transients and maintaining <2µA shutdown current for always-on modules. | Use Scenario: Converting 24V factory-floor power supplies to 3.3V for PLC I/O modules, motor drivers, and fieldbus interface ICs. IC Role / Device Role / Timing Role: High-efficiency, thermally robust point-of-load regulator in harsh industrial environments. Use Value: 64°C/W thermal resistance and -40°C to 125°C operating range ensure reliability under sustained 1.2A loads at elevated ambient temperatures. |
| Wall Transformer Regulation | Distributed Supply Regulation |
Use Scenario: Down-converting noisy, unregulated 12V wall adapters (common in legacy AC/DC supplies) to clean 3.3V for embedded networking equipment. IC Role / Device Role / Timing Role: Input-tolerant buck converter with built-in OVP/UVP to handle adapter ripple and dropout. Use Value: 7.5V–36V input range accommodates wide adapter tolerances; 1.5MHz switching minimizes output filter size. | Use Scenario: Providing isolated or distributed 3.3V rails across multi-board systems where centralized power is impractical. IC Role / Device Role / Timing Role: Compact, self-contained step-down regulator deployed locally at each subsystem. Use Value: 2mm × 3mm DFN package enables placement directly adjacent to load, reducing IR drop and improving transient response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3663EMS8E-3.3#TRPBF | Same electrical specs, but in 8-lead MSOP package with θJA = 35°C/W and different pinout (VOUTS instead of FB). | Preferred for higher-power or thermally constrained layouts needing lower thermal resistance and larger pitch for hand-soldering. | Select when PCB layout allows larger MSOP footprint and superior thermal performance is critical over minimal size. |
| LT1936ES8E#TRPBF | 36V, 1.4A buck; fixed 3.3V option; 500kHz fSW; no integrated boost diode; requires external bootstrap diode. | Lower switching frequency increases inductor size but reduces EMI; lacks transient robustness (max VIN = 36V, no 60V rating). | Choose when cost sensitivity outweighs transient immunity and board space permits larger magnetics. |
Compared with LT3663EMS8E-3.3#TRPBF, the LT3663EDCB-3.3#TRMPBF offers smaller footprint and identical functionality but higher thermal resistance; compared with LT1936ES8E#TRPBF, it provides superior transient handling, integrated boost diode, and faster switching - critical for space-constrained, high-reliability 3.3V point-of-load designs.
Availability
LT3663EDCB-3.3#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 parametric performance across –40°C to 125°C.
Supply support for LT3663EDCB-3.3#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 legacy Linear parts including the LT3663 family.
The LT3663 product line was designed for high-input-voltage, current-limited step-down regulation in automotive, industrial, and telecom power systems - emphasizing transient robustness, thermal efficiency, and simplified layout.
FAQ
What is the maximum input voltage rating for LT3663EDCB-3.3#TRMPBF?
The LT3663EDCB-3.3#TRMPBF has an absolute maximum input voltage rating of 60V for non-repetitive 1-second transients. Its normal operating input range is 7.5V to 36V, with overvoltage lockout activating at 36–41V (rising) to protect internal circuitry. This makes LT3663EDCB-3.3#TRMPBF suitable for automotive cold-crank and industrial surge environments.
Does LT3663EDCB-3.3#TRMPBF require external compensation components?
No, LT3663EDCB-3.3#TRMPBF is internally compensated. Its control loop uses a pole-zero combination on the VC node, eliminating the need for external compensation capacitors or resistors. This simplifies design, improves stability across line/load/temperature, and reduces bill-of-materials cost - a key advantage over many competing buck controllers.
How is the output current limit set on LT3663EDCB-3.3#TRMPBF?
The output current limit on LT3663EDCB-3.3#TRMPBF is set by connecting a resistor (RILIM) from the ILIM pin to GND. For example, a 28.7kΩ resistor programs a 1.0A limit. The relationship is linear: 0.4A requires 140kΩ, 1.2A requires 28.7kΩ. The current limit is average inductor current, tightly controlled via servo action of amplifier G2.
What package type and thermal characteristics does LT3663EDCB-3.3#TRMPBF use?
LT3663EDCB-3.3#TRMPBF uses an 8-lead (2mm × 3mm) plastic DFN package (DCB) with exposed GND pad (Pin 9). Its junction-to-ambient thermal resistance (θJA) is 64°C/W when properly soldered to a PCB with thermal vias and ground plane. This enables full 1.2A output at ambient temperatures up to 85°C without forced air cooling.
Can LT3663EDCB-3.3#TRMPBF be used with a 24V industrial supply?
Yes, LT3663EDCB-3.3#TRMPBF is explicitly designed for industrial 24V supplies. Its 7.5V–36V input range fully covers 24V nominal systems (including 20–28V variation), and its 60V transient rating handles switching surges common in factory environments. Combined with –40°C to 125°C operation and 64°C/W thermal resistance, LT3663EDCB-3.3#TRMPBF delivers reliable 3.3V/1.2A regulation in demanding industrial applications.
LT3663EDCB-3.3#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:
- 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-DFN (2x3)
LT3663EDCB-3.3#TRMPBF FAQ
1.How can I place an order for LT3663EDCB-3.3#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3663EDCB-3.3#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-3.3#TRMPBF reliable?
The price and inventory of LT3663EDCB-3.3#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-3.3#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3663EDCB-3.3#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3663EDCB-3.3#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3663EDCB-3.3#TRMPBF?
LT3663EDCB-3.3#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3663EDCB-3.3#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-3.3#TRMPBF?
For technical support, including LT3663EDCB-3.3#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3663EDCB-3.3#TRMPBF requirements.
6.How does Aetrix verify that LT3663EDCB-3.3#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3663EDCB-3.3#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-3.3#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3663EDCB-3.3#TRMPBF?
All LT3663EDCB-3.3#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3663EDCB-3.3#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-3.3#TRMPBF part is unused and in its original packaging.
Return procedure for LT3663EDCB-3.3#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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