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Analog Devices Inc. LT3663EMS8E-3.3#TRPBF
- Part No.:
- LT3663EMS8E-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3663EMS8E-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 1.2A 8MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT3663EMS8E-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a fixed 3.3V, 1.2A step-down switching regulator with programmable output current limit (0.4–1.2A), 7.5V–36V input range, and integrated boost diode in an 8-lead MSOP package with exposed thermal pad. It delivers stable power for automotive battery regulation and industrial supplies where transient robustness to 60V is required.
For engineers reviewing the LT3663EMS8E-3.3#TRPBF datasheet, LT3663EMS8E-3.3#TRPBF pinout, LT3663EMS8E-3.3#TRPBF application, or LT3663EMS8E-3.3#TRPBF equivalent, key selection criteria include its fixed 3.3V output, internal compensation, 1.5MHz switching frequency, thermal shutdown, and programmable current limit via ILIM resistor - all critical for compact, thermally constrained DC/DC designs.
Technical Context
The LT3663EMS8E-3.3#TRPBF implements constant-frequency peak current mode control with internal compensation and a bipolar NPN power switch. Its BOOST pin generates a gate drive voltage >VIN using an internal diode and external capacitor, enabling full saturation and low VCE(SAT) of 275mV at 1A.
It integrates input overvoltage lockout (39V typ), undervoltage lockout (7.5V rising), and thermal protection. The fixed 3.3V output eliminates external feedback resistors, while the ISENSE and VOUT pins enable precise current-sense-based output current limiting independent of load voltage drop.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% (3.234V–3.366V), eliminating need for external FB divider and reducing BOM count. |
| Max Output Current | 1.2A continuous, with programmable current limit (0.4–1.2A) to protect downstream components and manage system power dissipation. |
| Input Voltage Range | 7.5V to 36V operating, with 60V nonrepetitive transient tolerance - suitable for unregulated 12V/24V rails and automotive cold-crank scenarios. |
| Switching Frequency | 1.5MHz typical, enabling use of small external inductors (e.g., 4.7µH) and ceramic capacitors for compact, high-density layouts. |
| Switch VCE(SAT) | 275mV at 1A, minimizing conduction loss and improving efficiency under heavy load without requiring external MOSFET drivers. |
| Thermal Resistance θJA | 35°C/W (MSOP package with exposed pad soldered to PCB ground plane), supporting 1.2A operation up to 125°C ambient with proper layout. |
| Shutdown Current | ≤2µA at VRUN = 0V, enabling ultra-low-power standby in battery-backed systems. |
Pinout & Package
LT3663EMS8E-3.3#TRPBF is housed in an 8-lead plastic MSOP package (3.00mm × 4.90mm × 1.10mm) with exposed thermal pad (Pin 9, GND) that must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 7.5V–36V; bypassed with ≥1µF ceramic capacitor close to pin to suppress high-frequency switching noise. |
| RUN | Enable/shutdown control | Logic-high (>2.5V) enables regulation; grounded forces shutdown with ≤2µA quiescent current. |
| FB | Feedback reference node | Internally tied to 0.8V reference; unused in fixed-output versions - left unconnected per datasheet. |
| ILIM | Current limit programming | Resistor to GND sets output current limit (e.g., 28.7kΩ = 1.2A); enables precise system-level power budgeting. |
| SW | Switch node | Drives external inductor; carries high di/dt pulsed current - requires short, wide trace and local ground return. |
| BOOST | Bootstrap gate drive supply | Internal diode + external 0.1µF capacitor generate >VIN voltage to fully saturate internal NPN switch. |
| ISENSE | Current sense positive input | Connects to anode of internal boost diode and positive terminal of output current sense resistor (RSENSE2). |
| VOUT | Output current sense negative terminal | Connects to negative terminal of RSENSE2; used with ISENSE to monitor average inductor current for current-limit servo loop. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diode | Eliminates external Schottky diode in boost circuit, reducing component count and PCB area while maintaining efficient gate drive. |
| Programmable output current limit | 0.4A–1.2A via single ILIM resistor enables scalable protection across multiple load configurations without redesign. |
| Wide input transient tolerance | Withstands 60V nonrepetitive transients while disabling switching - allows direct connection to automotive or industrial 24V buses without external TVS. |
| Internally compensated architecture | Reduces design risk and validation time by removing need for external compensation network and stability analysis. |
| Exposed thermal pad (MSOP) | 35°C/W θJA enables full 1.2A output in compact form factor - superior thermal performance vs. DFN (64°C/W) for same current rating. |
Applications
| Automotive Battery Regulation | Industrial 24V Supply Regulation |
|---|---|
|
Use Scenario: Regulating raw vehicle battery (9V–16V nominal, up to 60V transients) to stable 3.3V for microcontroller, CAN transceiver, and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing isolated, current-limited 3.3V rail with OVP/UVP and thermal protection. Use Value: Eliminates need for external transient clamping and discrete current limiting, reducing bill-of-materials and board space in ECU and ADAS modules. |
Use Scenario: Converting unregulated 24V industrial PLC or motor drive bus to 3.3V for FPGA configuration, ADC reference, and digital I/O logic. IC Role / Device Role / Timing Role: Fixed-output buck converter delivering tightly regulated 3.3V with programmable current limit to prevent fault propagation during field wiring shorts. Use Value: Enables robust, maintenance-free operation in harsh environments where overcurrent events are common and thermal management is constrained. |
| Distributed Power Architecture | Wall Adapter-Fed Embedded Systems |
|
Use Scenario: Local point-of-load regulation on dense PCBs where centralized 12V/24V bus feeds multiple subsystems requiring clean 3.3V. IC Role / Device Role / Timing Role: Compact, thermally optimized DC/DC stage placed near high-speed logic to minimize IR drop and noise coupling. Use Value: 1.5MHz switching and MSOP package allow <50mm² solution size, supporting high-density routing and reduced EMI emissions. |
Use Scenario: Powering IoT edge nodes and smart sensors from low-cost, unregulated 12V wall adapters with poor line regulation. IC Role / Device Role / Timing Role: Input-tolerant buck regulator accepting 7.5V–36V input while delivering precise 3.3V output despite adapter ripple and dropout. Use Value: Removes need for pre-regulator LDO or additional filtering, lowering system cost and improving overall efficiency vs. linear solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3434EDD#TRPBF | 60V input, 2.4A output, 200kHz switching, TSSOP-16 package; no integrated boost diode; requires external catch diode and compensation. | Higher input voltage and output current capability but larger footprint and lower switching frequency - suited for high-power, low-EMI designs. | Choose when input exceeds 36V or output current >1.2A is needed; avoid if board space or 1.5MHz operation is critical. |
| LTC3631EMSE#TRPBF | 3.3V fixed, 1.5A output, 3.1V–40V input, 2MHz switching, MSOP-10 package; includes soft-start and power-good, no ILIM pin. | Higher max current and faster switching, but lacks programmable current limit - relies on internal foldback or external monitoring. | Prefer when higher output current and tighter transient response are required, and programmable current limiting is not mandatory. |
Compared with LT3663EMS8E-3.3#TRPBF, LT3434EDD#TRPBF offers higher voltage/current headroom at the cost of size and complexity, while LTC3631EMSE#TRPBF trades current limit flexibility for enhanced integration and speed - making LT3663EMS8E-3.3#TRPBF optimal for thermally constrained, current-budgeted 3.3V systems.
Availability
LT3663EMS8E-3.3#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial 24V supply regulation, and distributed power architecture requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LT3663EMS8E-3.3#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 DC/DC conversion in automotive, industrial, and telecom infrastructure - emphasizing transient robustness, thermal efficiency, and minimal external component count.
FAQ
What is the maximum input voltage the LT3663EMS8E-3.3#TRPBF can withstand without damage?
The LT3663EMS8E-3.3#TRPBF has an absolute maximum VIN rating of 60V for nonrepetitive 1-second transients. During such events, internal overvoltage lockout disables switching to protect the device, though the output will discharge. Continuous operation is specified from 7.5V to 36V. This makes LT3663EMS8E-3.3#TRPBF suitable for automotive and industrial environments with high-voltage spikes.
Does the LT3663EMS8E-3.3#TRPBF require external compensation components?
No, the LT3663EMS8E-3.3#TRPBF is internally compensated - no external RC network is needed on the VC or compensation pin. This simplifies design, reduces component count, and eliminates stability tuning. The internal pole-zero combination on the VC node ensures robust loop behavior across temperature and load conditions for the fixed 3.3V version.
How is the output current limit set on the LT3663EMS8E-3.3#TRPBF?
The output current limit on LT3663EMS8E-3.3#TRPBF is set by connecting a resistor (RILIM) between the ILIM pin and GND. For example, a 28.7kΩ resistor programs a 1.2A limit. Table 1 in the datasheet specifies values from 0.4A (140kΩ) to 1.2A (28.7kΩ). This current limit is averaged and servo-controlled via the ISENSE/VOUT pins to regulate system power dissipation.
Can the LT3663EMS8E-3.3#TRPBF operate with a 5V input?
No - the LT3663EMS8E-3.3#TRPBF has a minimum operating input voltage of 7.5V (rising UVLO threshold). At 5V, the device remains in undervoltage lockout and will not switch. It is intended for higher-input applications such as 12V/24V industrial or automotive supplies, not low-voltage battery-powered systems.
What is the purpose of the exposed pad on the LT3663EMS8E-3.3#TRPBF MSOP package?
The exposed pad (Pin 9) on the LT3663EMS8E-3.3#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane with multiple thermal vias to achieve the specified θJA of 35°C/W. Failure to connect it degrades thermal performance significantly and may cause premature thermal shutdown under 1.2A load.
LT3663EMS8E-3.3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) 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-MSOP-EP
LT3663EMS8E-3.3#TRPBF FAQ
1.How can I place an order for LT3663EMS8E-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3663EMS8E-3.3#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 LT3663EMS8E-3.3#TRPBF reliable?
The price and inventory of LT3663EMS8E-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3663EMS8E-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3663EMS8E-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3663EMS8E-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3663EMS8E-3.3#TRPBF?
LT3663EMS8E-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3663EMS8E-3.3#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 LT3663EMS8E-3.3#TRPBF?
For technical support, including LT3663EMS8E-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3663EMS8E-3.3#TRPBF requirements.
6.How does Aetrix verify that LT3663EMS8E-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3663EMS8E-3.3#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 LT3663EMS8E-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3663EMS8E-3.3#TRPBF?
All LT3663EMS8E-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3663EMS8E-3.3#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 LT3663EMS8E-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LT3663EMS8E-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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