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Analog Devices Inc. LT3663EDCB#TRPBF
- Part No.:
- LT3663EDCB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3663EDCB#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,112
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Product details
Overview
LT3663EDCB#TRPBF 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 thermally enhanced 8-lead 2mm × 3mm DFN package. Used in automotive battery regulation and industrial 24V supply conversion.
For engineers reviewing the LT3663EDCB#TRPBF datasheet, LT3663EDCB#TRPBF pinout, LT3663EDCB#TRPBF application, or LT3663EDCB#TRPBF equivalent, key selection criteria include VIN range (7.5–36V), programmable current limit via ILIM resistor, thermal performance of exposed-pad DFN, and compatibility with 5V fixed-output system architectures requiring robust overvoltage/undervoltage lockout.
Technical Context
The LT3663EDCB#TRPBF implements peak current mode control with 1.5MHz switching frequency, enabling compact external components. Its internal bipolar NPN switch features low VCE(SAT) (275mV @ 1A) and is driven by an integrated boost circuit generating >2.3V above SW for full saturation.
Output voltage regulation is achieved via feedback to the FB pin (0.8V reference), while output current limiting uses servo action on the ISENSE pin, comparing average inductor current against a voltage set by the ILIM resistor network. Input protection includes undervoltage lockout (7.5V rising) and overvoltage lockout (39V typical).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 36V continuous; withstands 60V nonrepetitive transients - supports unregulated 12V/24V supplies and automotive battery inputs. |
| Output Voltage | Fixed 5V ±1.5% - eliminates external feedback resistors; suitable for powering logic, sensors, and interface ICs directly. |
| Max Output Current Limit | Programmable 0.4A to 1.2A via ILIM resistor - enables precise power dissipation control and allows smaller inductors/diodes. |
| Switching Frequency | 1.5MHz (±150kHz) - permits use of sub-10µH inductors and reduces output ripple without increasing EMI filtering complexity. |
| Switch VCE(SAT) | 275mV at 1A - minimizes conduction loss and improves efficiency at high load currents. |
| Thermal Resistance θJA | 64°C/W - achievable with exposed pad soldered to PCB ground plane and thermal vias; enables 1.2A operation at +85°C ambient. |
| Shutdown Current | ≤2µA - ensures negligible battery drain during system sleep modes in automotive or portable applications. |
Pinout & Package
LT3663EDCB#TRPBF is housed in an 8-lead plastic DFN package (2mm × 3mm) with exposed GND pad (Pin 9) requiring solder connection to PCB ground for thermal and electrical integrity. Package outline complies with LTC DWG #05-08-1718 Rev A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input supply | Accepts 7.5–36V; bypassed with ≥1µF ceramic capacitor; must handle pulsed input current. |
| RUN | Enable/shutdown control | Logic-high (>2.5V) enables regulation; grounded disables switching and reduces quiescent current to ≤2µA. |
| FB | Feedback reference node | Regulated to 0.8V; connected to resistor divider tap for adjustable versions - not used in LT3663EDCB#TRPBF (fixed 5V). |
| ILIM | Current limit programming | Resistor-to-GND sets output current limit (e.g., 36.5kΩ = 1.0A); determines max average inductor current. |
| BOOST | Internal switch gate drive booster | Internally connected to BOOST diode cathode; requires 0.1µF capacitor to SW for efficient NPN saturation. |
| SW | Switch node | Connects to inductor, catch diode, and BOOST capacitor; carries high di/dt pulses - layout critical for EMI control. |
| ISENSE | Current sense input | Anode of internal BOOST diode; connects to positive terminal of external current sense resistor (RSENSE2). |
| VOUT | Regulated output return | Negative terminal of internal current sense resistor; tied to output capacitor negative and load ground. |
| GND (exposed pad) | Power and signal ground | Pin 9 exposed pad must be soldered to large PCB ground plane with multiple thermal vias for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diode | Eliminates external Schottky diode in boost path - reduces BOM count and board area while maintaining >2.3V BOOST-SW differential. |
| Programmable current limit | 0.4A–1.2A via single ILIM resistor - enables system-level power budgeting and protects downstream components during overload. |
| Internal compensation | No external compensation components required - simplifies design, improves stability margin, and accelerates time-to-market. |
| 60V transient tolerance | Withstands automotive load-dump events without shutdown - avoids system reset during battery disconnect/reconnect cycles. |
| Thermally enhanced DFN | 2mm × 3mm footprint with exposed GND pad - achieves 64°C/W θJA with standard 2-layer PCB, enabling high-power density designs. |
Applications
| Automotive Battery Regulation | Distributed Industrial Supply |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery rail to stable 5V for infotainment microcontrollers and CAN transceivers under cold-crank (6V) and load-dump (60V) conditions. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, current-limited 5V power domain with built-in OVP/UVP and thermal shutdown. Use Value: Eliminates need for external TVS and discrete current-limiting circuits; maintains regulation across wide input transients per ISO 7637-2. | Use Scenario: Converting 24V factory floor supply to 5V for PLC I/O modules, sensor interfaces, and fieldbus controllers operating in ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Fixed-output DC/DC regulator delivering 1.2A with programmable current limit to prevent bus fault propagation. Use Value: Enables predictable power delivery during short-circuit events; exposed-pad DFN sustains full load at elevated ambient via minimal thermal resistance. |
| Wall Adapter Power Conversion | High-Voltage Industrial Sensor Node |
Use Scenario: Stepping down unregulated 12V/24V wall adapter output to clean 5V for embedded processors and wireless SoCs in building automation gateways. IC Role / Device Role / Timing Role: Efficient, low-noise buck regulator with integrated boost diode and internal compensation - reducing component count and layout sensitivity. Use Value: Achieves >90% efficiency at 1A load; 1.5MHz switching allows small 4.7µH inductor and compact 0805/1206 passives. | Use Scenario: Powering isolated analog front-ends and ADCs in high-side current sensing systems where input may reach 36V from industrial transducers or HV auxiliary rails. IC Role / Device Role / Timing Role: Robust input-stage regulator with 39V overvoltage lockout and accurate current limiting to protect precision signal chain components. Use Value: Prevents damage to downstream op-amps and references during overvoltage faults; programmable ILIM ensures safe startup into capacitive loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3434EFE#TRPBF | 60V input, 2.4A output, 200kHz switching, TSSOP-16 package | Higher input voltage and output current; lower frequency demands larger magnetics | Select when input exceeds 36V or load current >1.2A is required; not pin-compatible. |
| LT1936EMS8E#TRPBF | 36V input, 1.4A output, 500kHz, MSOP-8 package, no integrated boost diode | Lacks internal boost diode - requires external Schottky; lower frequency increases inductor size | Choose for cost-sensitive designs where external diode is acceptable and 500kHz operation suits EMI requirements. |
Compared with LT3663EDCB#TRPBF, LT3434EFE#TRPBF supports higher input voltage and current but requires larger passive components due to lower frequency, while LT1936EMS8E#TRPBF offers similar voltage/current specs but lacks integrated boost diode and internal compensation - increasing design complexity and BOM count.
Availability
LT3663EDCB#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, distributed industrial supply, and wall transformer regulation requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LT3663EDCB#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 legacy of high-performance analog and power management ICs with rigorous reliability testing and automotive-grade qualification.
The LT3663 product line was designed for rugged, high-input-voltage step-down regulation in automotive, industrial, and telecom infrastructure - emphasizing transient robustness, programmable current limiting, and minimal external component count.
FAQ
What is the output voltage of the LT3663EDCB#TRPBF?
The LT3663EDCB#TRPBF is a fixed 5V output version of the LT3663 family. Its regulated output voltage is 5.0V ±1.5% over temperature and line, with no external feedback resistors required. This is confirmed in the "Order Information" table and Electrical Characteristics section of the datasheet, where LT3663EDCB#TRPBF is explicitly listed alongside LT3663EDCB-5#TRPBF as a 5V variant. The LT3663EDCB#TRPBF does not support adjustable output voltages.
Does the LT3663EDCB#TRPBF require an external boost diode?
No, the LT3663EDCB#TRPBF integrates a boost diode internally - its anode is connected to the ISENSE pin and cathode to the BOOST pin. This eliminates the need for an external Schottky diode in the bootstrap circuit, reducing component count and PCB area. The datasheet confirms this in the "Features" list ("Integrated Boost Diode") and Pin Functions description, and the functional block diagram shows D2 as internal. External diodes are only needed for specialized configurations (e.g., <2.5V outputs), which do not apply to the 5V LT3663EDCB#TRPBF.
What is the maximum output current capability of the LT3663EDCB#TRPBF?
The LT3663EDCB#TRPBF supports a programmable output current limit from 0.4A to 1.2A, set by an external resistor on the ILIM pin. With RILIM = 36.5kΩ, the device delivers up to 1.0A; with 28.7kΩ, it reaches 1.2A. This current limit is the average inductor current, tightly controlled by the internal servo amplifier. The datasheet specifies "VOUT Current Limit Range: 0.4A to 1.2A" and provides Table 1 correlating resistor values to limit thresholds - all applicable to LT3663EDCB#TRPBF as a member of the LT3663 family.
What package type and thermal characteristics does the LT3663EDCB#TRPBF use?
The LT3663EDCB#TRPBF uses an 8-lead plastic DFN package measuring 2mm × 3mm with an exposed GND pad (Pin 9). Its thermal resistance is θJA = 64°C/W when mounted on a standard 2-layer PCB with the exposed pad soldered to a solid ground plane and thermal vias. This value is specified in the "Pin Configuration" section and Package Description drawing (LTC DWG #05-08-1718 Rev A), and enables full 1.2A output at +85°C ambient with proper layout.
How does the LT3663EDCB#TRPBF handle input overvoltage conditions?
The LT3663EDCB#TRPBF incorporates input overvoltage lockout (OVP) that disables switching when VIN exceeds 39V (typical), protecting internal circuitry during transients. It tolerates nonrepetitive 60V transients for up to 1 second without damage, as stated in Absolute Maximum Ratings. During OVP event, the device enters safe high-impedance state - output discharges through load, but no power is delivered. This behavior is confirmed in the "Features" list ("Overvoltage Lockout Protects Circuit through 60V Transients") and Electrical Characteristics table (VIN Overvoltage Lockout: 36–41V).
LT3663EDCB#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)
LT3663EDCB#TRPBF FAQ
1.How can I place an order for LT3663EDCB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3663EDCB#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#TRPBF reliable?
The price and inventory of LT3663EDCB#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3663EDCB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3663EDCB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3663EDCB#TRPBF?
LT3663EDCB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3663EDCB#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#TRPBF?
For technical support, including LT3663EDCB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3663EDCB#TRPBF requirements.
6.How does Aetrix verify that LT3663EDCB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3663EDCB#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3663EDCB#TRPBF?
All LT3663EDCB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3663EDCB#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#TRPBF part is unused and in its original packaging.
Return procedure for LT3663EDCB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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