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Analog Devices Inc. LT3663EMS8E#TRPBF
- Part No.:
- LT3663EMS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3663EMS8E#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,549
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Product details
Overview
LT3663EMS8E#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 a fixed 5V output in an 8-lead MSOP package with exposed thermal pad. Used in automotive battery regulation and industrial 24V supply conversion.
For engineers reviewing the LT3663EMS8E#TRPBF datasheet, LT3663EMS8E#TRPBF pinout, LT3663EMS8E#TRPBF application, or LT3663EMS8E#TRPBF equivalent, key selection criteria include its 5V fixed output, 1.2A programmable current limit, 7.5–36V wide input range, thermal shutdown, and MSOP-8 thermally enhanced package for high-power-density designs.
Technical Context
The LT3663EMS8E#TRPBF implements peak current mode control with a fixed 1.5MHz switching frequency, enabling compact external components. Its internal bipolar NPN power switch features low VCE(SAT) (275mV at 1A) and is driven by a self-generated BOOST voltage (>2.3V above SW), eliminating need for external bootstrap circuitry.
Output current limiting is achieved via servo-controlled average-current sensing using an external resistor on the ILIM pin, while feedback regulation occurs at the FB pin (0.8V reference). Input protection includes undervoltage lockout (7.5V rising) and overvoltage lockout (39V typical), allowing safe operation up to 60V transients without switching.
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. |
| Switching Frequency | 1.5MHz (typical) - enables use of small inductors (e.g., 3.3µH–6.8µH) and ceramic capacitors for space-constrained designs. |
| Output Current Limit | Programmable 0.4A to 1.2A via ILIM resistor - controls system power dissipation and allows downsizing of inductor/diode. |
| Switch VCE(SAT) | 275mV at 1A - reduces conduction loss and improves efficiency at medium load currents. |
| Thermal Resistance θJA | 35°C/W (MSOP-8 with exposed pad soldered to PCB) - enables 1.2A operation up to +125°C ambient with proper layout. |
| Shutdown Current | ≤2µA - supports ultra-low-power standby modes in battery-backed or always-on systems. |
Pinout & Package
LT3663EMS8E#TRPBF is housed in an 8-lead plastic MSOP package (3.0mm × 3.0mm × 1.1mm) with exposed thermal pad (Pin 9 = GND), optimized for low thermal resistance (θJA = 35°C/W). The exposed pad must be soldered to a PCB ground plane with thermal vias for reliable operation at full load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input power supply connection | Accepts 7.5V–36V; bypassed with ≥1µF ceramic capacitor; handles pulsed input current during switching. |
| RUN | Enable/shutdown control input | Logic-high (≥2.5V) enables regulation; grounded disables switching and reduces quiescent current to ≤2µA. |
| FB | Feedback reference node | Internally regulated to 0.8V; unused in fixed-5V version (LT3663EMS8E#TRPBF); tied internally to output divider. |
| ILIM | Current limit programming input | Resistor-to-GND sets average output current limit (e.g., 28.7kΩ = 1.2A); enables precise system-level power management. |
| SW | Switch node | Drives external inductor; connects to catch diode cathode and BOOST capacitor; carries high di/dt switching current. |
| BOOST | Internal switch gate drive booster | Self-biased via internal diode and external capacitor; must exceed SW by >2.3V for full switch saturation. |
| ISENSE | Current sense amplifier positive input | Connects to positive terminal of internal current-sense resistor; also serves as anode of internal BOOST diode. |
| VOUT | Regulated output connection | Delivers fixed 5V; requires ≥10µF ceramic output capacitance for stability and low ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated BOOST diode | Eliminates external Schottky diode for bootstrapping, reducing BOM count and PCB area in 5V-output configurations. |
| Programmable output current limit | Enables precise thermal design margining: limits max inductor/diode stress and system power dissipation under overload. |
| Wide input voltage range (7.5V–36V) | Supports direct connection to 24V industrial rails and automotive batteries without pre-regulation, simplifying front-end design. |
| Thermally enhanced MSOP-8 package | 35°C/W junction-to-ambient thermal resistance enables 1.2A continuous output at +125°C ambient with proper PCB layout. |
| Internal compensation | Reduces external component count: no loop compensation network required - accelerates design cycle and improves consistency. |
Applications
| Automotive Battery Regulation | Industrial 24V Supply Conversion |
|---|---|
|
Use Scenario: Regulating raw vehicle battery (9V–16V nominal, up to 36V load dump) to stable 5V for infotainment microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Primary DC/DC buck converter providing isolated, current-limited 5V rail with transient overvoltage protection. Use Value: Withstands 60V transients and provides programmable 1.2A current limit - protects downstream logic from surge-induced latch-up and thermal runaway. |
Use Scenario: Converting unregulated 24V factory floor supply (20V–36V) to clean 5V for PLC I/O modules and sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Fixed-output step-down regulator delivering tightly regulated 5V with minimal external components and high thermal reliability. Use Value: 35°C/W θJA and internal compensation enable robust operation in enclosed enclosures without forced air cooling. |
| Distributed Power Architecture | Wall Adapter-Based Systems |
|
Use Scenario: Local point-of-load regulation on dense PCBs where centralized 12V/24V bus feeds multiple subsystems requiring independent 5V rails. IC Role / Device Role / Timing Role: Compact, thermally efficient buck converter placed near load to minimize IR drop and EMI. Use Value: 1.5MHz switching frequency allows use of 3.3µH inductors and 10µF ceramic output caps - reduces footprint vs. lower-frequency alternatives. |
Use Scenario: Replacing linear regulators in AC/DC wall adapters supplying 5V to embedded gateways, IoT hubs, and USB-powered peripherals. IC Role / Device Role / Timing Role: High-efficiency switching alternative to 7805-style LDOs, improving adapter thermal performance and energy efficiency. Use Value: >90% efficiency at 1A load (VIN=12V) reduces heat generation and enables smaller adapter housings versus 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 |
|---|---|---|---|
| LT3663EDCB-5#TRPBF | Same electrical specs but in 2mm × 3mm DFN package (θJA = 64°C/W vs. 35°C/W); no exposed pad on bottom surface. | Preferred for ultra-thin or double-sided assembly; less thermal headroom than MSOP-8 at full 1.2A load in high ambient. | Select when board thickness or reflow profile constraints favor DFN; verify thermal derating for sustained 1.2A operation. |
| LT1936EMS8E#TRPBF | 36V-input, 1.4A buck regulator, but fixed 5V output only; 500kHz switching (vs. 1.5MHz); no programmable current limit. | Lacks ILIM pin functionality; simpler for basic 5V conversion but cannot enforce system-level current limits or reduce power path component size. | Choose when current limiting is unnecessary and lower switching frequency is acceptable for larger inductor/capacitor footprints. |
Compared with LT3663EDCB-5#TRPBF, the LT3663EMS8E#TRPBF offers superior thermal performance in space-constrained layouts; versus LT1936EMS8E#TRPBF, it adds critical programmable current limiting for system-level power management and thermal safety.
Availability
LT3663EMS8E#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial 24V supply conversion, and distributed power architecture requiring stable component supply across extended temperature ranges (–40°C to +125°C).
Supply support for LT3663EMS8E#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 for demanding industrial, automotive, and communications applications.
The LT3663 product line delivers rugged, high-voltage step-down regulators with integrated current limiting and transient protection - designed specifically for harsh environments where input voltage instability and thermal constraints are critical.
FAQ
What is the output voltage of the LT3663EMS8E#TRPBF?
The LT3663EMS8E#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 LT3663EMS8E-5#TRPBF (identical to LT3663EMS8E#TRPBF per marking code LTFMZ) specifies VOUT = 4.900V to 5.100V.
Does the LT3663EMS8E#TRPBF require an external BOOST diode?
No, the LT3663EMS8E#TRPBF integrates the BOOST diode internally - its ISENSE pin serves as the anode and BOOST pin as the cathode. This eliminates the need for an external Schottky diode in standard 5V-output configurations, as verified in the Pin Functions section and Functional Block Diagram. External diodes are only recommended for outputs below 2.5V, which does not apply to this 5V-fixed variant.
What is the maximum continuous output current for the LT3663EMS8E#TRPBF?
The LT3663EMS8E#TRPBF supports up to 1.2A continuous output current when properly heatsinked - achieved by setting the ILIM pin with a 28.7kΩ resistor to GND. This value is explicitly listed in Table 1 ("Output Current Limit vs RILIM Value") and confirmed in the Electrical Characteristics table under "VOUT Current Limit" (0.8A to 1.2A range, typ. 1.0A). Thermal performance depends on PCB layout and ambient conditions.
Can the LT3663EMS8E#TRPBF operate with a 40V input?
Yes - the LT3663EMS8E#TRPBF has an absolute maximum input rating of 60V for nonrepetitive 1-second transients, and its overvoltage lockout activates at ~39V (rising), disabling switching to protect downstream circuitry. At 40V input, the device enters safe shutdown mode and sustains the voltage without damage, as stated in Absolute Maximum Ratings and Electrical Characteristics sections. Continuous operation is limited to ≤36V.
Is the LT3663EMS8E#TRPBF pin-compatible with other LT3663 variants in MSOP-8?
Yes - all LT3663 variants in the MSOP-8 package (including LT3663IMS8E#TRPBF, LT3663HMS8E#TRPBF, and fixed-output versions like LT3663EMS8E-3.3#TRPBF) share identical pinout and footprint per the "Pin Configuration" diagram for MSE PACKAGE. The LT3663EMS8E#TRPBF uses the same 8-pin arrangement and exposed pad (Pin 9 = GND), enabling direct substitution within the same temperature grade and output voltage variant.
LT3663EMS8E#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LT3663EMS8E#TRPBF FAQ
1.How can I place an order for LT3663EMS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3663EMS8E#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#TRPBF reliable?
The price and inventory of LT3663EMS8E#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3663EMS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3663EMS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3663EMS8E#TRPBF?
LT3663EMS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3663EMS8E#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#TRPBF?
For technical support, including LT3663EMS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3663EMS8E#TRPBF requirements.
6.How does Aetrix verify that LT3663EMS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3663EMS8E#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3663EMS8E#TRPBF?
All LT3663EMS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3663EMS8E#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#TRPBF part is unused and in its original packaging.
Return procedure for LT3663EMS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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