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Analog Devices Inc. LT3663HMS8E-5#TRPBF
- Part No.:
- LT3663HMS8E-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3663HMS8E-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1.2A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,605
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Product details
Overview
LT3663HMS8E-5#TRPBF 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 delivers regulated 5V output for industrial power supplies requiring robust overvoltage protection up to 60V transient.
For engineers reviewing the LT3663HMS8E-5#TRPBF datasheet, LT3663HMS8E-5#TRPBF pinout, LT3663HMS8E-5#TRPBF application, or LT3663HMS8E-5#TRPBF equivalent, key selection criteria include its H-grade 150°C junction temperature rating, MSOP-8 thermally enhanced package with exposed pad, 0.4A–1.2A programmable current limit, and compatibility with automotive battery regulation and distributed supply systems.
Technical Context
The LT3663HMS8E-5#TRPBF implements constant-frequency peak current mode control with internal slope compensation and an active clamp on the VC node for current limiting. Its bipolar NPN switch features low VCE(SAT) of 275mV at 1A and relies on an external boost capacitor to generate gate drive voltage above VIN via an integrated diode.
Input protection includes undervoltage lockout (7.5V rising threshold) and overvoltage lockout (39V typical), enabling safe operation across 60V transients. The device uses internal resistor divider for 5V regulation (FB = 800mV), eliminating external feedback components while retaining ILIM pin programmability for output current limit from 0.4A to 1.2A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.5% (regulated via internal 800mV FB reference and resistor divider) |
| Max Output Current | 1.2A continuous (programmable via ILIM pin resistor; default 1.0A with 36.5kΩ) |
| Input Voltage Range | 7.5V to 36V operating; withstands nonrepetitive 60V transients without damage |
| Switching Frequency | 1.5MHz typical (fixed, enables compact LC filter design with ≤10µH inductors) |
| Thermal Rating | H-grade: –40°C to +150°C junction temperature (enables high-ambient automotive/industrial use) |
| Package | 8-Lead MSOP (MS8E) with exposed thermal pad (θJA = 35°C/W) |
| Current Limit Accuracy | ±20% over full temperature range (–40°C to 150°C), verified per Electrical Characteristics table |
Pinout & Package
LT3663HMS8E-5#TRPBF is housed in an 8-lead plastic MSOP package (MS8E) with exposed GND pad (Pin 9) for thermal management. The exposed pad must be soldered to PCB ground plane using thermal vias for optimal θJA = 35°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies internal regulator and switch; accepts 7.5V–36V, tolerates 60V transients |
| RUN | Enable/shutdown control | Logic-high ≥2.5V enables operation; logic-low ≤0.3V places device in <2µA shutdown |
| FB | Feedback reference node | Internally regulated to 800mV; connects to internal 5V divider - no external resistors required |
| ILIM | Current limit programming | Resistor-to-GND sets average output current limit (0.4A–1.2A); 36.5kΩ = 1.0A nominal |
| SW | Switch node | Drives external inductor and catch diode; high dv/dt node requiring short PCB trace |
| BOOST | Bootstrap gate drive | Connects to boost capacitor cathode; must exceed SW by >2.3V for full switch saturation |
| 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 |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diode | Eliminates external Schottky diode for BOOST circuit, reducing BOM count and layout complexity |
| Programmable output current limit | Enables precise system-level power dissipation control and allows downsizing of inductor/diode ratings |
| Internal compensation | Reduces external component count to only input/output capacitors, inductor, catch diode, and ILIM resistor |
| 60V transient tolerance | Allows direct connection to unregulated 24V industrial rails or automotive batteries without pre-regulation |
| H-grade temperature rating | Guaranteed operation to +150°C junction enables deployment in engine bay or enclosed industrial enclosures |
Applications
| Automotive Battery Regulation | Distributed Supply Regulation |
|---|---|
|
Use Scenario: Regulating 12V/24V vehicle battery to stable 5V for infotainment microcontrollers under cold-crank and load-dump conditions. IC Role / Device Role / Timing Role: Primary buck converter providing isolated, current-limited 5V rail with OVP/UVLO protection. Use Value: Withstands 60V transients and operates down to 7.5V input, eliminating need for external TVS or pre-regulator stages. |
Use Scenario: Powering remote I/O modules in factory automation where long cable runs introduce voltage drop and noise. IC Role / Device Role / Timing Role: Local point-of-load regulator converting 24V field bus to clean 5V for PLC interface ICs. Use Value: Programmable current limit prevents thermal runaway during partial short circuits in distributed wiring harnesses. |
| Industrial Power Supplies | Wall Transformer Regulation |
|
Use Scenario: Generating 5V auxiliary supply from 36V industrial DC bus for sensor signal conditioning and isolation drivers. IC Role / Device Role / Timing Role: High-input-voltage buck regulator delivering tightly regulated 5V with minimal external components. Use Value: 1.5MHz switching enables small 4.7µH inductors and ceramic output caps, reducing board area vs. lower-frequency alternatives. |
Use Scenario: Replacing linear regulators in legacy 12V wall adapters to improve efficiency and reduce heat in compact enclosures. IC Role / Device Role / Timing Role: Efficient step-down converter replacing LM7805-style solutions in space-constrained AC/DC adapters. Use Value: 90%+ efficiency at 1A load eliminates heatsink requirement and enables smaller plastic housings. |
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 | Higher current, lower frequency, larger footprint; requires external boost diode and compensation network | Choose when >1.2A output or 60V continuous input is required; avoid if board space or BOM count is constrained |
| LTC3632EMSE#TRPBF | 36V input, 1.2A output, 1.5MHz, MSOP-10, integrated MOSFETs, no current limit programming | Monolithic synchronous buck; lacks programmable current limit but offers higher efficiency and smaller solution size | Choose for highest efficiency and lowest EMI; avoid when precise system-level current limiting is mandatory |
Compared with LT3663HMS8E-5#TRPBF, LT3434EDD#TRPBF supports higher input voltage and output current but demands more external components and PCB area, while LTC3632EMSE#TRPBF delivers better efficiency in a slightly larger package but forfeits programmable current limiting - making LT3663HMS8E-5#TRPBF optimal for thermally demanding, current-limited industrial applications.
Availability
LT3663HMS8E-5#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, and distributed supply systems requiring stable component supply with guaranteed long-term availability and extended temperature support.
Supply support for LT3663HMS8E-5#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 product support, datasheets, and application engineering for all Linear-branded power ICs.
The LT3663 product line was designed for rugged, wide-input-voltage step-down regulation in harsh environments - specifically targeting automotive, industrial, and telecom infrastructure where reliability under voltage transients and high ambient temperatures is critical.
FAQ
What is the maximum input voltage rating for LT3663HMS8E-5#TRPBF?
The LT3663HMS8E-5#TRPBF has an absolute maximum input voltage rating of 60V for nonrepetitive 1-second transients. Its normal operating input range is 7.5V to 36V. This 60V transient rating allows direct connection to automotive batteries and industrial 24V rails without external clamping, and is explicitly confirmed in the Absolute Maximum Ratings table.
Does LT3663HMS8E-5#TRPBF require external feedback resistors for 5V output?
No, LT3663HMS8E-5#TRPBF does not require external feedback resistors. As a fixed 5V version, it incorporates an internal resistor divider that regulates the FB pin to 800mV, directly producing 5.0V ±1.5% output. This eliminates two external components and simplifies layout - a key distinction from adjustable versions like LT3663HMS8E#TRPBF.
What is the purpose of the ILIM pin on LT3663HMS8E-5#TRPBF?
The ILIM pin on LT3663HMS8E-5#TRPBF programs the average output current limit between 0.4A and 1.2A using a single resistor to GND. This feature enables precise control of system power dissipation and protects downstream components during overload. For example, a 36.5kΩ resistor sets the limit to 1.0A, as specified in Table 1 of the datasheet.
How does the thermal performance of LT3663HMS8E-5#TRPBF compare to DFN-package variants?
LT3663HMS8E-5#TRPBF uses an MSOP-8 package with exposed pad and achieves θJA = 35°C/W, significantly better than the DFN (DCB) variant's θJA = 64°C/W. This 45% lower thermal resistance, combined with its H-grade 150°C junction rating, makes LT3663HMS8E-5#TRPBF preferable for high-ambient applications where board space permits the slightly larger MSOP footprint.
Can LT3663HMS8E-5#TRPBF operate with a 2.5V input supply?
No, LT3663HMS8E-5#TRPBF cannot operate with a 2.5V input. Its minimum operating input voltage is 7.5V, as defined by the VIN undervoltage lockout rising threshold. Attempting to power it below 7.5V will prevent startup and regulation. This limitation is inherent to its bipolar switch architecture and internal regulator requirements.
LT3663HMS8E-5#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):
- 5V
- 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-5#TRPBF FAQ
1.How can I place an order for LT3663HMS8E-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3663HMS8E-5#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-5#TRPBF reliable?
The price and inventory of LT3663HMS8E-5#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-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3663HMS8E-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3663HMS8E-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3663HMS8E-5#TRPBF?
LT3663HMS8E-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3663HMS8E-5#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-5#TRPBF?
For technical support, including LT3663HMS8E-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3663HMS8E-5#TRPBF requirements.
6.How does Aetrix verify that LT3663HMS8E-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3663HMS8E-5#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-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3663HMS8E-5#TRPBF?
All LT3663HMS8E-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3663HMS8E-5#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-5#TRPBF part is unused and in its original packaging.
Return procedure for LT3663HMS8E-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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