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Analog Devices Inc. LT3663HMS8E-3.3#TRPBF
- Part No.:
- LT3663HMS8E-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3663HMS8E-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 1.2A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,528
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Product details
Overview
LT3663HMS8E-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, wide 7.5V–36V input range, integrated boost diode, and thermally enhanced MSOP-8 package rated for –40°C to 150°C junction temperature. It delivers stable power in automotive battery regulation and industrial supplies where transient tolerance up to 60V is required.
For engineers reviewing the LT3663HMS8E-3.3#TRPBF datasheet, LT3663HMS8E-3.3#TRPBF pinout, LT3663HMS8E-3.3#TRPBF application, or LT3663HMS8E-3.3#TRPBF equivalent, key selection criteria include its 1.5MHz fixed-frequency peak-current-mode control, 275mV switch VCE(SAT) at 1A, internal compensation, and 0.4A–1.2A programmable current limit via ILIM resistor - all critical for compact, high-efficiency DC/DC designs under thermal stress.
Technical Context
The LT3663HMS8E-3.3#TRPBF implements constant-frequency, current-mode control with an internal bipolar NPN power switch and integrated boost diode driving the BOOST pin to ensure full saturation. Its servo-based output current limit circuit monitors average inductor current via ISENSE and ILIM, enabling precise system-level power dissipation control independent of output voltage regulation.
It features dual protection architecture: input overvoltage lockout (36V–41V typ.) and undervoltage lockout (7V–7.5V rising), plus thermal shutdown and low-quiescent shutdown current (≤2µA). The device operates with internal compensation and requires no external loop components, simplifying design while maintaining stability across load and line variations.
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, with programmable current limit (0.4A–1.2A) protecting downstream components |
| Input Voltage Range | 7.5V to 36V operating; withstands non-repetitive 60V transients without damage |
| Switching Frequency | 1.5MHz typical, enabling use of small external inductors (e.g., 4.7µH) and ceramic capacitors |
| Switch VCE(SAT) | 275mV at 1A, minimizing conduction loss and improving efficiency at high load currents |
| Junction Temp Range | –40°C to +150°C, supporting operation in under-hood automotive and high-ambient industrial environments |
| Shutdown Current | ≤2µA at VRUN = 0V, enabling ultra-low-power system standby modes |
Pinout & Package
LT3663HMS8E-3.3#TRPBF uses an 8-lead plastic MSOP package (3.00mm × 3.00mm × 1.10mm) with exposed thermal pad (Pin 9, GND) soldered to PCB for θJA = 35°C/W. Package marking code is LTFMX.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Accepts 7.5V–36V; bypassed with ≥1µF ceramic capacitor; withstands 60V transients |
| RUN | Enable/shutdown control | Logic-high ≥2.5V enables regulation; grounded disables IC with ≤2µA quiescent draw |
| FB | Feedback reference node | Internally regulated to 0.8V; unused in fixed-output versions like LT3663HMS8E-3.3#TRPBF |
| ILIM | Current limit programming | Resistor-to-GND sets output current limit (28.7kΩ = 1.2A); enables system-level power budgeting |
| SW | Switch node | Drives external inductor; carries high di/dt pulsed current; must be routed short and low-inductance |
| BOOST | Bootstrap drive supply | Provides >VIN gate drive for internal NPN switch; requires 0.1µF ceramic capacitor to SW |
| ISENSE | Current sense input | Positive terminal of internal current-sense resistor; also anode of internal boost diode |
| VOUT | Regulated output | Delivers fixed 3.3V; connects to output capacitor and load; negative side of internal sense resistor |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Diode | Eliminates external Schottky diode, reducing BOM count and board area in 3.3V applications |
| Programmable Output Current Limit | Enables precise thermal management by capping max average inductor current (0.4A–1.2A) |
| Thermally Enhanced MSOP-8 | Exposed pad and θJA = 35°C/W allow 1.2A operation at +125°C ambient without heatsink |
| Internal Compensation | Reduces design risk and layout sensitivity by removing requirement for external compensation network |
| 60V Transient Tolerance | Allows direct connection to unregulated 24V industrial rails or automotive batteries without pre-regulation |
Applications
| Automotive Battery Regulation | Distributed Supply Regulation |
|---|---|
Use Scenario: Powering infotainment head units and ADAS sensors directly from 12V/24V vehicle battery with cold-crank and load-dump immunity. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator providing clean, regulated power with 60V transient survival and thermal derating up to 150°C junction. Use Value: Eliminates need for external TVS or pre-regulator stages, reducing cost and footprint while meeting ISO 7637-2 pulse 5a/b requirements. | Use Scenario: Local point-of-load conversion in PLC backplanes or factory automation controllers with multiple isolated subsystems. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter delivering 3.3V at up to 1.2A per rail, with programmable current limit per module. Use Value: Enables modular power design with predictable thermal behavior and fault containment-overload on one rail does not affect others. |
| Industrial Supplies | Wall Transformer Regulation |
Use Scenario: Converting unregulated 24V industrial SMPS outputs to 3.3V for microcontrollers, I/O drivers, and communication interfaces. IC Role / Device Role / Timing Role: High-input-voltage buck regulator with UVLO/OVLO and thermal shutdown, operating continuously at 85°C ambient. Use Value: Maintains regulation across wide input variation (e.g., 18V–32V) while limiting power dissipation via current limit during overload. | Use Scenario: Regulating noisy, unfiltered 12V wall adapter outputs to clean 3.3V for embedded networking devices. IC Role / Device Role / Timing Role: Input-tolerant step-down converter with integrated boost diode and low EMI layout support. Use Value: Achieves >85% efficiency at 1A with minimal external components, meeting Class B conducted emissions without added filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3630EMSE-3.3#PBF | 4.5V–60V input, 3.3V/1.2A, synchronous rectification, 3mm × 4mm MSOP-10 | Higher efficiency (>90% at 1A) due to synchronous FETs; requires external bootstrap capacitor | Preferred when efficiency >88% at full load is mandatory and layout space allows 10-pin MSOP |
| LT8609SIS8E#TRPBF | 3.0V–42V input, 3.3V/2A, Silent Switcher® architecture, 8-lead MSOP with integrated caps | Superior EMI performance (CISPR 25 Class 5 compliant), higher output current, but larger solution size | Selected when automotive EMI compliance is required and 2A capability adds margin |
Compared with LTC3630EMSE-3.3#PBF and LT8609SIS8E#TRPBF, the LT3663HMS8E-3.3#TRPBF offers lower component count and smaller footprint for 1.2A applications where 60V transient tolerance and 150°C operation are prioritized over peak efficiency or EMI certification.
Availability
LT3663HMS8E-3.3#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial supplies, and distributed supply regulation requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT3663HMS8E-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 full technical and manufacturing continuity for legacy Linear power products.
The LT3663 product line was designed for high-reliability, wide-input-voltage DC/DC conversion in harsh environments - specifically targeting automotive, industrial, and telecom infrastructure applications demanding robust transient protection and extended temperature operation.
FAQ
What is the maximum input voltage rating for LT3663HMS8E-3.3#TRPBF?
The LT3663HMS8E-3.3#TRPBF has an absolute maximum input voltage rating of 60V for non-repetitive 1-second transients. Its guaranteed operating input range is 7.5V to 36V, with overvoltage lockout activating at 36V–41V (typical rising threshold). This makes LT3663HMS8E-3.3#TRPBF suitable for automotive and industrial systems where load dump or surge events occur.
Does LT3663HMS8E-3.3#TRPBF require external compensation components?
No, LT3663HMS8E-3.3#TRPBF is internally compensated. Its control loop is stabilized using an integrated pole-zero network on the VC node, eliminating the need for external compensation capacitors or resistors. This simplifies design, reduces bill-of-materials cost, and improves consistency across production units - a key advantage confirmed in the LT3663 datasheet Functional Block Diagram and Applications Information sections.
What is the purpose of the ILIM pin on LT3663HMS8E-3.3#TRPBF?
The ILIM pin on LT3663HMS8E-3.3#TRPBF programs the output current limit between 0.4A and 1.2A using a resistor to ground. For LT3663HMS8E-3.3#TRPBF configured for 1.2A output, a 28.7kΩ resistor is used. This feature enables precise system-level power dissipation control, protects external components (inductor, diode), and supports thermal design without oversizing magnetics - directly referenced in Table 1 and Applications Information of the LT3663 datasheet.
Can LT3663HMS8E-3.3#TRPBF operate at 150°C junction temperature?
Yes, LT3663HMS8E-3.3#TRPBF is an H-grade part qualified for operation from –40°C to +150°C junction temperature. Its MSOP-8 package includes an exposed thermal pad (Pin 9, GND) that must be soldered to a PCB ground plane with thermal vias to achieve θJA = 35°C/W. Derating curves in the datasheet confirm 1.2A output is sustainable at +125°C ambient when properly heatsinked - making LT3663HMS8E-3.3#TRPBF appropriate for under-hood automotive locations.
Is the BOOST pin on LT3663HMS8E-3.3#TRPBF connected to an internal diode?
Yes, the BOOST pin on LT3663HMS8E-3.3#TRPBF is internally connected to the cathode of an integrated boost diode, while the ISENSE pin serves as the anode. A 0.1µF ceramic capacitor must be placed between BOOST and SW to generate a voltage ~2.3V above SW, ensuring full saturation of the internal NPN switch. This configuration eliminates the need for an external Schottky diode in 3.3V applications - explicitly detailed in the Pin Functions and BOOST Pin Considerations sections of the LT3663 datasheet.
LT3663HMS8E-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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LT3663HMS8E-3.3#TRPBF FAQ
1.How can I place an order for LT3663HMS8E-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3663HMS8E-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 LT3663HMS8E-3.3#TRPBF reliable?
The price and inventory of LT3663HMS8E-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 LT3663HMS8E-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3663HMS8E-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3663HMS8E-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3663HMS8E-3.3#TRPBF?
LT3663HMS8E-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3663HMS8E-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 LT3663HMS8E-3.3#TRPBF?
For technical support, including LT3663HMS8E-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3663HMS8E-3.3#TRPBF requirements.
6.How does Aetrix verify that LT3663HMS8E-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3663HMS8E-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 LT3663HMS8E-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3663HMS8E-3.3#TRPBF?
All LT3663HMS8E-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3663HMS8E-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 LT3663HMS8E-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LT3663HMS8E-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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