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Analog Devices Inc. LT3663HMS8E#TRPBF
- Part No.:
- LT3663HMS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3663HMS8E#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,345
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Product details
Overview
LT3663HMS8E#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), integrated boost diode, and internal compensation. It operates from 7.5V to 36V input (60V transient tolerant) and delivers regulated 5V output in thermally enhanced 8-lead MSOP package with exposed pad. Used in automotive battery regulation and industrial power supplies where precise current limiting and high-temperature reliability are critical.
For engineers reviewing the LT3663HMS8E#TRPBF datasheet, LT3663HMS8E#TRPBF pinout, LT3663HMS8E#TRPBF application, or LT3663HMS8E#TRPBF equivalent, key selection criteria include its –40°C to 150°C junction temperature rating, 275mV switch VCE(SAT) at 1A, programmable current limit via ILIM resistor, and compatibility with 5V fixed-output configurations without external feedback resistors.
Technical Context
The LT3663HMS8E#TRPBF implements constant-frequency peak current mode control with internal slope compensation and an active clamp on the VC node for stable current limiting. Its oscillator runs at 1.5MHz (not 1MHz - confirmed for non-X variants), enabling compact magnetics and low output ripple.
It integrates a bipolar NPN power switch driven by a BOOST circuit that self-generates >VIN voltage using an internal diode and external capacitor. Input protection includes undervoltage lockout (7.5V rising threshold) and overvoltage lockout (39V typical), allowing safe operation up to 60V transients while disabling switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 36V continuous; withstands 60V non-repetitive transients - enables use with unregulated 12V/24V industrial or automotive sources. |
| Output Current Limit | Programmable 0.4A to 1.2A via ILIM pin resistor - provides precise system-level power dissipation control and protects downstream components. |
| Switching Frequency | 1.5MHz (typical) - allows small inductors (e.g., 3.3µH–6.8µH) and ceramic output capacitors for space-constrained designs. |
| Switch VCE(SAT) | 275mV at 1A - reduces conduction loss and improves efficiency under full load, especially at high ambient temperatures. |
| Operating Junction Temp | –40°C to +150°C - qualified for under-hood automotive and high-temp industrial environments without derating until 125°C. |
| Feedback Reference | 800mV (±2%) - enables accurate output regulation; fixed 5V version (LT3663HMS8E#TRPBF) uses internal resistor divider, eliminating FB pin routing. |
| Shutdown Current | ≤2µA at VRUN = 0V - supports ultra-low-power standby modes in battery-backed systems. |
Pinout & Package
LT3663HMS8E#TRPBF is housed in an 8-lead plastic MSOP package (MS8E) with exposed thermal pad (Pin 9 = GND). The exposed pad must be soldered to a PCB ground plane with thermal vias for θJA = 35°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 7.5V–36V; bypassed with ≥1µF ceramic capacitor; handles pulsed input current during switching. |
| RUN | Enable/shutdown control | Logic-high (≥2.5V) enables regulation; grounded disables IC with ≤2µA quiescent current. |
| ILIM | Current limit programming | Resistor to GND sets output current limit (e.g., 28.7kΩ = 1.2A); enables system-level power budgeting. |
| SW | Switch node | Drives external inductor and catch diode; high dI/dt node requiring short, low-inductance PCB trace. |
| BOOST | Bootstrap drive voltage | Internally connected to cathode of boost diode; requires 0.1µF capacitor to SW for efficient NPN switch saturation. |
| 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 | Power and signal ground | Exposed pad (Pin 9) is primary thermal and electrical ground path - must be soldered and thermally anchored. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diode | Eliminates external Schottky diode for BOOST circuit - reduces BOM count and layout complexity in 5V/3.3V applications. |
| Programmable current limit | 0.4A–1.2A range set by single ILIM resistor - replaces discrete current-limiting circuits and simplifies overload protection design. |
| Internal compensation | No external compensation network required - accelerates design cycle and ensures stability across operating conditions. |
| Thermal shutdown | Auto-recovery protection triggered above TJ = 165°C - prevents permanent damage during sustained overload or poor heatsinking. |
| Fixed 5V output option | Internal 800mV reference + resistor divider - removes FB pin routing and calibration risk; validated for ±1% output accuracy over temperature. |
Applications
| Automotive Battery Regulation | Distributed Supply Regulation |
|---|---|
Use Scenario: Regulating 12V/24V vehicle battery 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 transient immunity up to 60V. Use Value: Prevents system latch-up during load dump events and enforces strict 1.2A max current to protect wiring harnesses and connectors. |
Use Scenario: Local point-of-load conversion in industrial PLC backplanes where multiple 5V rails feed I/O modules. IC Role / Device Role / Timing Role: Compact, thermally robust DC/DC stage delivering regulated 5V with programmable current limit per module. Use Value: Enables modular design with consistent power delivery and built-in fault containment - no single module can overload shared bus. |
| Industrial Power Supplies | Wall Transformer Regulation |
Use Scenario: Converting 24V factory DC bus to 5V for sensors, actuators, and fieldbus interfaces in harsh environments. IC Role / Device Role / Timing Role: High-temperature-rated buck regulator maintaining regulation from –40°C to +150°C junction. Use Value: Eliminates need for external thermal derating circuits; maintains full 1.2A output capability up to 125°C ambient. |
Use Scenario: Replacing linear regulators in AC/DC wall adapters to improve efficiency and reduce heat in enclosed enclosures. IC Role / Device Role / Timing Role: Efficient 1.5MHz switching regulator converting rectified/unfiltered 12V–36V to clean 5V output. Use Value: Achieves >90% efficiency at 1A, reducing adapter surface temperature by >15°C versus 7805-based 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 - higher voltage/current but lower frequency and larger magnetics. | Designed for wide-input industrial systems needing >36V tolerance and higher output current. | Select when input exceeds 36V or load current >1.2A; avoid if board space or EMI constraints favor 1.5MHz operation. |
| LT1936EMS8E#TRPBF | 36V input, 1.4A output, 500kHz, no programmable current limit - lacks ILIM pin and thermal grade beyond 125°C. | Cost-optimized for general-purpose 5V/3.3V conversion without current-limiting requirements. | Choose for simpler, lower-cost designs where precise current control and extended temperature range are not needed. |
Compared with LT3434EDD#TRPBF and LT1936EMS8E#TRPBF, LT3663HMS8E#TRPBF uniquely combines 1.5MHz operation, programmable current limiting, and 150°C junction rating - making it optimal for space-constrained, high-reliability automotive and industrial applications demanding tight power budgeting.
Availability
LT3663HMS8E#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, and distributed supply regulation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3663HMS8E#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving automotive, industrial, communications, and aerospace markets.
The LT3663 product line was designed specifically for rugged, current-controlled buck conversion in automotive and industrial environments - emphasizing transient robustness, thermal resilience, and system-level power management via programmable current limit.
FAQ
What is the maximum input voltage rating for LT3663HMS8E#TRPBF?
The LT3663HMS8E#TRPBF has an absolute maximum input voltage rating of 60V for non-repetitive 1-second transients. Continuous operation is specified from 7.5V to 36V. This 60V transient tolerance enables reliable use in automotive load-dump scenarios and industrial surges without external clamping.
Does LT3663HMS8E#TRPBF require external feedback resistors for 5V output?
No. The LT3663HMS8E#TRPBF is the fixed 5V output variant - it contains an internal resistor divider referenced to the 800mV feedback node, so no external R1/R2 network is needed. The FB pin is not used and may be left unconnected or tied to GND.
How is output current limit programmed on LT3663HMS8E#TRPBF?
Output current limit on LT3663HMS8E#TRPBF is set by connecting a resistor (RILIM) between the ILIM pin and GND. For example, 28.7kΩ yields 1.2A limit; 36.5kΩ yields 1.0A. Table 1 in the datasheet provides exact RILIM values across the 0.4A–1.2A range.
What thermal performance can be expected from LT3663HMS8E#TRPBF in MSOP package?
The LT3663HMS8E#TRPBF in MSOP package achieves θJA = 35°C/W when the exposed pad is properly soldered to a 2-layer PCB with ≥4 thermal vias to an internal ground plane. This allows full 1.2A output at +85°C ambient without thermal shutdown.
Is LT3663HMS8E#TRPBF pin-compatible with other LT3663 variants in MSOP package?
Yes. All LT3663 variants in the MS8E package - including LT3663EMS8E#TRPBF, LT3663IMS8E#TRPBF, and LT3663HMS8E#TRPBF - share identical pinout, footprint, and thermal pad configuration. Only the temperature grade and output voltage option differ.
LT3663HMS8E#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:
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LT3663HMS8E#TRPBF FAQ
1.How can I place an order for LT3663HMS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3663HMS8E#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#TRPBF reliable?
The price and inventory of LT3663HMS8E#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3663HMS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3663HMS8E#TRPBF transactions.
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4.How is shipping managed for LT3663HMS8E#TRPBF?
LT3663HMS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3663HMS8E#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#TRPBF?
For technical support, including LT3663HMS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3663HMS8E#TRPBF requirements.
6.How does Aetrix verify that LT3663HMS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3663HMS8E#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3663HMS8E#TRPBF?
All LT3663HMS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3663HMS8E#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#TRPBF part is unused and in its original packaging.
Return procedure for LT3663HMS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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