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Analog Devices Inc. LT3663IDCB#TRPBF
- Part No.:
- LT3663IDCB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3663IDCB#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,116
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Product details
Overview
LT3663IDCB#TRPBF from Analog Devices (formerly Linear Technology) is a 1.2A, 1.5MHz fixed-frequency current-mode step-down switching regulator with programmable output current limit (0.4A–1.2A), 7.5V–36V input range, and integrated boost diode. It delivers regulated 5V output in an 8-lead 2mm × 3mm DFN package with exposed GND pad, targeting automotive battery regulation and industrial distributed supplies.
For engineers reviewing the LT3663IDCB#TRPBF datasheet, LT3663IDCB#TRPBF pinout, LT3663IDCB#TRPBF application, or LT3663IDCB#TRPBF equivalent, key selection criteria include its 60V transient tolerance, internal compensation, thermal shutdown, and precise current-limit programming via ILIM resistor - all critical for robust 12V/24V system power management.
Technical Context
The LT3663IDCB#TRPBF employs peak current-mode control with a fixed 1.5MHz switching frequency and internal slope compensation to prevent subharmonic oscillation. Its bipolar NPN switch features low VCE(SAT) (275mV at 1A) and is driven by a self-booted gate circuit using the BOOST pin and internal diode.
It integrates undervoltage lockout (7.5V rising threshold), overvoltage lockout (39V typical), and thermal shutdown. The device uses an internal 0.8V feedback reference and supports external resistor programming of output voltage - though this specific variant (LT3663IDCB#TRPBF) is the 5V fixed-output version per ordering information.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±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 (±10% variation); enables compact magnetics and low EMI |
| Current Limit Accuracy | ±10% over full temperature range; enables precise system-level power dissipation control |
| Thermal Resistance θJA | 64°C/W (DFN package with soldered exposed pad); requires PCB thermal vias for full rating |
| Shutdown Current | ≤2µA (at VRUN = 0V); supports ultra-low-power system standby modes |
Pinout & Package
LT3663IDCB#TRPBF is housed in an 8-lead (2mm × 3mm) plastic DFN package with exposed GND pad (Pin 9), requiring soldering to PCB ground plane for thermal and electrical performance. 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 near pin |
| RUN | Enable/shutdown control | Logic-high ≥2.5V enables operation; grounded disables regulator and reduces IQ to ≤2µA |
| FB | Feedback reference node | Regulated to 0.8V internally; not used in fixed 5V variants (LT3663IDCB#TRPBF has internal divider) |
| ILIM | Current limit programming | Resistor-to-GND sets output current limit (e.g., 36.5kΩ = 1.0A; 28.7kΩ = 1.2A) |
| BOOST | Bootstrap drive voltage source | Internally connected to cathode of boost diode; must be >2.3V above SW for full switch saturation |
| SW | Switch node | Connects to inductor, catch diode, and boost capacitor; carries high di/dt pulsed current |
| ISENSE | Current sense input | Anode of internal boost diode; connects to positive terminal of external current-sense resistor |
| VOUT | Output return path | Negative terminal of internal current-sense resistor; ties to output capacitor negative |
| GND (exposed pad) | Power and signal ground | Pins 1–8 GND connections + exposed Pad 9 must be soldered to large PCB ground plane with thermal vias |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diode | Eliminates external Schottky diode in standard 5V applications, reducing BOM count and layout area |
| Programmable current limit | Enables precise control of max power dissipation in downstream components (inductor, diode, traces) |
| 60V transient protection | Allows direct connection to unregulated automotive or industrial rails without external TVS clamping |
| Internal compensation | Reduces external component count to only input/output capacitors, inductor, catch diode, and ILIM resistor |
| Thermally enhanced DFN | Exposed pad + 64°C/W θJA enables 1.2A operation at up to 85°C ambient with proper PCB copper |
Applications
| Automotive Battery Regulation | Distributed Supply Regulation |
|---|---|
|
Use Scenario: Regulating 12V vehicle battery (7.5V–16V nominal, up to 36V load dump) to stable 5V for infotainment microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, current-limited 5V rail with OVP/UVLO and thermal protection. Use Value: Withstands 60V transients without external clamping; programmable current limit prevents fuse blowing during short-circuit events on downstream modules. |
Use Scenario: Generating local 5V supply from 24V industrial bus for PLC I/O modules, sensor interfaces, and fieldbus controllers. IC Role / Device Role / Timing Role: High-reliability DC/DC converter delivering regulated 5V with tight current limiting to protect against cable fault conditions. Use Value: 7.5V–36V input range accommodates brownouts and surges; internal compensation simplifies design across multiple board revisions. |
| Wall Transformer Regulation | Industrial Embedded Power |
|
Use Scenario: Converting unregulated 12V/24V wall adapter output to clean 5V for network routers, PoE splitters, and edge gateways. IC Role / Device Role / Timing Role: Efficient step-down regulator with fixed 5V output and 1.5MHz switching for minimal filter size. Use Value: 1.5MHz operation allows use of small 4.7µH–6.8µH inductors; 275mV VCE(SAT) minimizes conduction loss at full load. |
Use Scenario: Providing 5V bias for FPGA configuration, ADC references, and real-time MCU subsystems in ruggedized embedded systems. IC Role / Device Role / Timing Role: Industrial-grade (–40°C to 125°C) buck regulator with guaranteed current limit accuracy across temperature. Use Value: ±10% current limit tolerance ensures consistent trip point over temperature; exposed pad enables reliable thermal management in sealed enclosures. |
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#TRPBF | Same silicon, extended temperature grade (–40°C to 125°C vs. –40°C to 125°C - identical spec; 'E' and 'I' grades share same min/max limits per datasheet Note 3) | No functional difference; 'E' grade historically designated for commercial temp but fully overlaps 'I' grade specs | Select LT3663IDCB#TRPBF when sourcing from distributors listing industrial-grade traceability or lot-controlled inventory. |
| LT3663IMS8E-5#TRPBF | Same 5V fixed output, but in 8-lead MSOP package with lower θJA (35°C/W) and different pinout (VOUTS instead of FB) | Requires PCB redesign; MSOP offers better thermal performance but larger footprint (3mm × 3mm vs. 2mm × 3mm) | Choose LT3663IMS8E-5#TRPBF only if thermal budget is tighter than DFN allows and board space permits larger package. |
Compared with LT3663EDCB#TRPBF, the LT3663IDCB#TRPBF offers identical electrical and thermal specs but may differ in traceability documentation; versus LT3663IMS8E-5#TRPBF, it trades higher θJA for 30% smaller footprint and simplified layout - ideal for space-constrained industrial modules.
Availability
LT3663IDCB#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed supplies, and wall transformer regulation requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for LT3663IDCB#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 technical and manufacturing continuity for the LT® product family, renowned for high-performance analog and power management ICs.
The LT3663IDCB#TRPBF belongs to Linear's high-voltage buck regulator product line, designed specifically for robust 12V/24V system power conversion in automotive, industrial, and telecom infrastructure where reliability under voltage transients is critical.
FAQ
What is the guaranteed operating temperature range for LT3663IDCB#TRPBF?
The LT3663IDCB#TRPBF is specified for operation from –40°C to 125°C junction temperature. All electrical characteristics - including output voltage accuracy (±1.5%), current limit (±10%), and UVLO/OVLO thresholds - are guaranteed across this full range per datasheet Note 3.
Does LT3663IDCB#TRPBF require an external feedback resistor divider?
No. The LT3663IDCB#TRPBF is the fixed 5V output variant; its internal resistor divider sets VOUT = 5V, so the FB pin is not used and must be left unconnected. External resistors are only required for adjustable versions like LT3663IDCB-ADJ.
What is the purpose of the ISENSE pin on LT3663IDCB#TRPBF?
The ISENSE pin on LT3663IDCB#TRPBF serves two roles: it is the anode of the internal boost diode (critical for gate drive voltage generation), and it connects to the positive terminal of the external current-sense resistor used for output current limiting - enabling accurate average-current regulation.
Can LT3663IDCB#TRPBF operate with input voltage below 7.5V?
No. The LT3663IDCB#TRPBF has a guaranteed undervoltage lockout (UVLO) rising threshold of 7.5V. Below this, the device remains disabled. Operation below 7.5V is not characterized and may result in erratic switching or failure to regulate.
How is the output current limit programmed on LT3663IDCB#TRPBF?
The output current limit on LT3663IDCB#TRPBF is set by connecting a resistor (RILIM) between the ILIM pin and GND. For example, 28.7kΩ yields 1.2A, 36.5kΩ yields 1.0A, and 48.7kΩ yields 0.8A - values confirmed in Table 1 of the LT3663 datasheet.
LT3663IDCB#TRPBF 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)
LT3663IDCB#TRPBF FAQ
1.How can I place an order for LT3663IDCB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3663IDCB#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#TRPBF reliable?
The price and inventory of LT3663IDCB#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3663IDCB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3663IDCB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3663IDCB#TRPBF?
LT3663IDCB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3663IDCB#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#TRPBF?
For technical support, including LT3663IDCB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3663IDCB#TRPBF requirements.
6.How does Aetrix verify that LT3663IDCB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3663IDCB#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3663IDCB#TRPBF?
All LT3663IDCB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3663IDCB#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#TRPBF part is unused and in its original packaging.
Return procedure for LT3663IDCB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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