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Analog Devices Inc. LT3663IDCB-5
- Part No.:
- LT3663IDCB-5
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3663IDCB-5.pdf
- Description:
- IC REG BUCK 5V 1.2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,328
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Product details
Overview
LT3663IDCB-5 from Analog Devices (formerly Linear Technology) is a 5V fixed-output, 1.2A step-down switching regulator with programmable output current limit, wide 7.5V–36V input range, integrated boost diode, and internal compensation. It operates at 1.5MHz fixed frequency in peak current mode and targets automotive battery regulation and industrial distributed supplies.
For engineers reviewing the LT3663IDCB-5 datasheet, LT3663IDCB-5 pinout, LT3663IDCB-5 application, or LT3663IDCB-5 equivalent, key selection criteria include its 5V fixed output, –40°C to 125°C operating temperature grade, 8-lead 2mm × 3mm DFN package with exposed GND pad, and programmable 0.4A–1.2A output current limit via ILIM resistor.
Technical Context
The LT3663IDCB-5 implements constant-frequency peak current mode control with internal slope compensation and an internally compensated error amplifier (G1) that regulates FB to 0.8V. Its servo-based output current limit circuit uses ISENSE and ILIM pins to enforce average inductor current limits independent of load transients.
It integrates a bipolar NPN power switch with 275mV VCE(SAT) at 1A, a bootstrap drive stage using the BOOST pin and internal diode, and protection features including 7.5V–39V VIN undervoltage/overvoltage lockout (with 60V transient tolerance), thermal shutdown, and low-current shutdown mode drawing ≤2µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.5% (guaranteed over –40°C to 125°C); eliminates external feedback divider. |
| Max Output Current | 1.2A continuous (programmable down to 0.4A via ILIM resistor); enables precise system-level power dissipation control. |
| Input Voltage Range | 7.5V to 36V operating; withstands non-repetitive 60V transients - suitable for 12V/24V automotive and industrial rails. |
| Switching Frequency | 1.5MHz typical (1.35–1.65MHz range); allows compact magnetics and reduces EMI fundamental below 2MHz. |
| Efficiency | Up to 90% at 1A with VIN = 15V; enabled by low 275mV switch saturation voltage and integrated boost diode. |
| Thermal Resistance | θJA = 64°C/W (DFN package); requires exposed GND pad soldered to PCB ground plane for reliable 1.2A operation at 125°C ambient. |
| Shutdown Current | ≤2µA at VRUN = 0V; supports ultra-low-power system standby modes. |
Pinout & Package
LT3663IDCB-5 is housed in an 8-lead (2mm × 3mm) plastic DFN package with exposed GND pad (Pin 9), requiring soldering to PCB ground for thermal and electrical performance. Package outline complies with LTC DWG #05-08-1718 Rev A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input supply | Accepts 7.5V–36V; bypass with ≥1µF ceramic capacitor; withstands 60V transients. |
| RUN | Enable/shutdown control | Logic-high ≥2.5V enables regulation; grounded disables IC with ≤2µA quiescent current. |
| FB | Feedback reference node | Internally regulated to 0.800V; unused in fixed-output LT3663IDCB-5 (no external divider required). |
| ILIM | Current limit programming | Resistor to GND sets average output current limit (28.7kΩ = 1.2A per Table 1). |
| SW | Switch node | Drives external inductor; high dv/dt node - must be routed short and away from sensitive traces. |
| BOOST | Bootstrap drive voltage | Supplies >VIN gate drive to internal NPN switch; requires 0.1µF capacitor to SW. |
| ISENSE | Current sense positive input | Connects to positive terminal of internal current-sense resistor; also anode of internal boost diode. |
| VOUT | Regulated output return | Connects to negative terminal of internal current-sense resistor; ties to output capacitor negative. |
| GND (exposed pad) | Power and signal ground | Pin 9 exposed pad must be soldered to large PCB ground plane with thermal vias for θJA = 64°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diode | Eliminates external Schottky diode in boost path, reducing BOM count and layout area. |
| Programmable output current limit | 0.4A–1.2A via single ILIM resistor - enables optimized inductor/diode sizing and predictable fault current limiting. |
| Internal compensation | Reduces external components; no loop compensation network required for stable 5V operation. |
| 60V transient tolerance | Withstands automotive load-dump events without external clamping, simplifying front-end protection design. |
| Thermally enhanced DFN | 2mm × 3mm footprint with exposed GND pad delivers 64°C/W junction-to-ambient thermal resistance. |
Applications
| Automotive Battery Regulation | Distributed Supply Regulation |
|---|---|
Use Scenario: Regulating 12V or 24V vehicle battery rail to stable 5V for infotainment microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Primary 5V DC/DC converter with transient immunity and programmable current limit for fault containment. Use Value: Withstands 60V load-dump transients and maintains regulation across cold-crank (6.5V) to alternator-overvoltage (39V) conditions. | Use Scenario: Providing localized 5V power to isolated subsystems in factory automation PLCs or motor drives. IC Role / Device Role / Timing Role: Compact, thermally efficient point-of-load regulator replacing linear regulators in space-constrained modules. Use Value: 1.5MHz switching enables <10µH inductors and <22µF ceramic output capacitance, minimizing board area. |
| Industrial Power Supplies | Wall Transformer Regulation |
Use Scenario: Converting unregulated 24V industrial bus to clean 5V for sensors, I/O conditioners, and fieldbus interfaces. IC Role / Device Role / Timing Role: Fixed-output buck controller with accurate current limiting for predictable thermal behavior under overload. Use Value: Programmable 1.2A limit protects downstream circuitry and allows use of lower-rated magnetics and catch diodes. | Use Scenario: Replacing linear regulators in AC/DC wall adapters powering embedded controllers or USB peripherals. IC Role / Device Role / Timing Role: High-efficiency 5V step-down regulator accepting wide-input unregulated DC from rectified AC sources. Use Value: 90% efficiency at 1A reduces heat sink requirements and improves adapter energy efficiency compliance. |
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 5V fixed output, 1.2A rating, and 1.5MHz frequency, but in 8-lead MSOP package with θJA = 35°C/W. | Preferred where lower thermal resistance is critical and board area permits larger MSOP footprint (3mm × 3mm vs DFN 2mm × 3mm). | Select when thermal performance outweighs size constraints; MSOP offers easier rework but larger area. |
| LTC3630AEMSE-5#PBF | 5V fixed, 1.5A, 3MHz sync buck; requires external compensation; no integrated boost diode; 40V max VIN. | Suitable for higher-frequency, higher-current designs needing tighter ripple control and sync capability, but demands more external components. | Choose for 3MHz operation or synchronous rectification; not drop-in due to different pinout, compensation, and boost architecture. |
Compared with LT3663IMS8E-5 and LTC3630AEMSE-5, the LT3663IDCB-5 provides optimal balance of compact 2mm × 3mm DFN size, 64°C/W thermal performance, integrated boost diode, and plug-and-play 5V fixed output - ideal for space- and reliability-constrained industrial and automotive modules.
Availability
LT3663IDCB-5 is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed supplies, and wall transformer regulation requiring stable component supply across extended temperature ranges.
Supply support for LT3663IDCB-5 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 legacy Linear parts including the LT3663 family.
The LT3663 product line was designed specifically for rugged, wide-input industrial and automotive DC/DC conversion with programmable current limiting and transient-hardened operation - distinguishing it from general-purpose buck regulators.
FAQ
What is the operating temperature range for the LT3663IDCB-5?
The LT3663IDCB-5 is rated for –40°C to 125°C junction temperature. This "I" grade variant guarantees full electrical specifications across that range, making it suitable for under-hood automotive and industrial environments where ambient temperatures exceed 85°C. Derating of output current is required as ambient approaches 125°C, based on θJA = 64°C/W and measured power dissipation.
Does the LT3663IDCB-5 require an external feedback resistor divider?
No. The LT3663IDCB-5 is a fixed 5V output version; its internal resistor divider is factory-trimmed to regulate VOUT to 5.0V ±1.5%. The FB pin is internally connected and must not be externally biased. External resistors are only needed for adjustable versions like LT3663EDCB or LT3663IDCB (non-suffixed).
How is the output current limit set on the LT3663IDCB-5?
The LT3663IDCB-5 uses the ILIM pin to program output current limit via a resistor to GND. For the default 1.2A limit, a 28.7kΩ resistor is specified (per Table 1). Lower values increase current limit; higher values decrease it. The relationship is monotonic and calibrated - e.g., 36.5kΩ yields 1.0A, 48.7kΩ yields 0.8A.
Can the LT3663IDCB-5 operate with input voltages above 36V?
Yes - the LT3663IDCB-5 tolerates non-repetitive 60V transients on VIN, but continuous operation above 36V will trigger overvoltage lockout (OVP) and halt switching. The OVP threshold is typically 39V (rising), with 1V hysteresis. During OVP, the part remains powered and safe, but VOUT discharges through the load; it resumes regulation once VIN falls below ~38V.
What package type and thermal requirements apply to the LT3663IDCB-5?
The LT3663IDCB-5 uses an 8-lead 2mm × 3mm plastic DFN package (LTC DWG #05-08-1718 Rev A) with exposed GND pad (Pin 9). That pad must be soldered to a solid PCB ground plane with ≥4 thermal vias (0.3mm diameter) to achieve the specified θJA = 64°C/W. Inadequate grounding causes thermal shutdown or reduced current capability.
LT3663IDCB-5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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):
- 5V
- 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)
LT3663IDCB-5 FAQ
1.How can I place an order for LT3663IDCB-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3663IDCB-5 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 reliable?
The price and inventory of LT3663IDCB-5 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 is usually 5 days.
3.What payment methods are accepted for LT3663IDCB-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3663IDCB-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3663IDCB-5?
LT3663IDCB-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3663IDCB-5 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?
For technical support, including LT3663IDCB-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3663IDCB-5 requirements.
6.How does Aetrix verify that LT3663IDCB-5 is sourced from the original manufacturer or authorized distributors?
All LT3663IDCB-5 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 meets industry standards.
7.What is the process for return or replacement of LT3663IDCB-5?
All LT3663IDCB-5 units undergo pre-shipment inspection (PSI). If there is an issue with LT3663IDCB-5, 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 part is unused and in its original packaging.
Return procedure for LT3663IDCB-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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