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Analog Devices Inc. LT3663EMS8E#PBF
- Part No.:
- LT3663EMS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3663EMS8E#PBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,458
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Product details
Overview
LT3663EMS8E#PBF from Analog Devices (formerly Linear Technology) is a fixed-frequency, current-mode step-down switching regulator with programmable output current limit and integrated boost diode. It operates from 7.5V to 36V input, delivers up to 1.2A output current, features 0.8V feedback reference, 1.5MHz switching frequency, and thermal shutdown. It is used in automotive battery regulation and industrial 24V supply conversion where precise power dissipation control is required.
For engineers reviewing the LT3663EMS8E#PBF datasheet, LT3663EMS8E#PBF pinout, LT3663EMS8E#PBF application, or LT3663EMS8E#PBF equivalent, key selection criteria include its 8-lead MSOP package with exposed pad, programmable 0.4–1.2A current limit via ILIM resistor, 7.5–36V input range with 60V transient tolerance, and internal compensation eliminating external loop components.
Technical Context
The LT3663EMS8E#PBF implements peak current mode control with fixed 1.5MHz oscillator, internal slope compensation, and active clamp on the VC node for current limiting. Its bipolar NPN switch uses an integrated boost diode and external boost capacitor to achieve low 275mV VCE(SAT) at 1A, enabling high efficiency across wide duty cycles.
Input protection includes undervoltage lockout (7.5V rising threshold) and overvoltage lockout (39V typical), while system-level safety is ensured by thermal shutdown and low 0.01µA shutdown current. The device supports both adjustable and fixed-output variants - this part is the MSOP-packaged version without internal feedback divider, requiring external FB resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7.5V to 36V continuous; withstands 60V nonrepetitive transients - suitable for unregulated 12V/24V rails and automotive cold-crank conditions. |
| Output Current Limit | Programmable 0.4A to 1.2A via ILIM resistor - enables precise system-level power dissipation control and smaller passive component sizing. |
| Switching Frequency | 1.5MHz (LT3663); enables compact magnetics and low-profile 2.2µF–22µF ceramic output capacitors. |
| Feedback Reference | 0.800V ±2% (784–816mV) - sets output voltage accuracy and stability for external resistor-divider programming. |
| Switch VCE(SAT) | 275mV at 1A - reduces conduction loss and improves full-load efficiency, especially critical in 5V/3.3V conversion from 12V–24V inputs. |
| Shutdown Current | 0.01µA typical at VRUN = 0V - supports ultra-low-power standby modes in battery-backed or energy-sensitive systems. |
| Package Thermal Resistance | θJA = 35°C/W (MSOP-8 with exposed pad) - enables 1.2A operation at +85°C ambient without forced airflow when properly soldered to PCB ground plane. |
Pinout & Package
LT3663EMS8E#PBF 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 optimal thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input supply | Accepts 7.5–36V; bypass with ≥1µF X7R ceramic close to pin; sustains 60V transients without damage. |
| RUN | Enable/shutdown control | Logic-high ≥2.5V enables regulation; grounded disables switching and reduces quiescent current to 0.01µA. |
| FB | Feedback input | Regulated to 0.800V; connects to resistor divider tap to set output voltage (e.g., 3.3V or 5V). |
| ILIM | Current limit programming | Resistor-to-GND sets average output current limit (0.4–1.2A); enables system-level thermal management. |
| SW | Switch node | Drives external inductor; carries high di/dt pulsed current - requires short, low-inductance PCB trace. |
| BOOST | Bootstrap drive supply | Internally connected to BOOST diode anode; requires 0.1µF ceramic capacitor to SW for gate drive voltage >VIN. |
| ISENSE | Current sense input | Positive terminal of internal current-sense resistor; also anode of internal BOOST diode. |
| VOUT | Output return path | Negative terminal of internal current-sense resistor; connects to load ground side to enable accurate current limiting. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diode | Eliminates external Schottky diode in most 3.3V/5V applications, reducing BOM count and board area. |
| Internal compensation | Removes need for external Type II/III compensation network - simplifies design and improves stability margin. |
| Programmable current limit | Enables consistent thermal behavior across varying loads; protects downstream components during overload or short circuit. |
| Thermally enhanced MSOP | 35°C/W θJA with exposed pad allows 1.2A continuous output at +85°C ambient using standard 2-layer PCB layout. |
| 60V transient tolerance | Withstands automotive load-dump events without external clamping, reducing system-level protection complexity. |
Applications
| Automotive Battery Regulation | Distributed Supply Regulation |
|---|---|
Use Scenario: Regulating 12V/24V automotive battery rail to stable 5V or 3.3V for infotainment microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Primary DC/DC buck converter providing isolated, current-limited, and thermally managed power domain. Use Value: 60V transient tolerance eliminates need for external TVS; programmable current limit prevents fuse blowing during ECU hot-plug events. | Use Scenario: Local point-of-load conversion in industrial PLC backplanes where 24V bus powers multiple sensor nodes. IC Role / Device Role / Timing Role: Compact, self-contained step-down regulator delivering regulated 3.3V/5V with precise current limiting per subsystem. Use Value: Internal compensation and integrated boost diode reduce component count; MSOP package fits dense I/O module layouts. |
| Industrial Supplies | Wall Transformer Regulation |
Use Scenario: Converting unregulated 24V industrial supply to 5V for fieldbus interface ICs operating in harsh temperature environments. IC Role / Device Role / Timing Role: High-reliability buck regulator with thermal shutdown and UVLO/OVLO protection for continuous operation. Use Value: –40°C to +125°C operating range and 35°C/W thermal resistance support fanless enclosures in factory settings. | Use Scenario: Replacing linear regulators in 12V wall adapters powering IoT gateways and smart home hubs. IC Role / Device Role / Timing Role: Efficient switching alternative to 7805-style LDOs, minimizing heat buildup in enclosed plastic housings. Use Value: 1.5MHz switching enables use of small 2.2µF–10µF ceramic output caps; 90%+ efficiency at 1A reduces adapter surface temperature. |
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#PBF | 60V input, 2.4A output, 200kHz switching, TSSOP-16 package; no integrated boost diode. | Better suited for higher-current, lower-frequency designs with external diode flexibility; larger footprint and higher EMI. | Select when >1.2A output or >36V input is required; avoid if board space or 1.5MHz switching is critical. |
| LT1936EMS8E#PBF | 36V input, 1.4A output, 500kHz, MSOP-8, integrated bootstrap but no programmable current limit. | Lacks ILIM pin - fixed current limit not user-adjustable; simpler for basic buck needs but less flexible for thermal management. | Choose for cost-sensitive, fixed-current applications where programmability is unnecessary; verify thermal margin at full load. |
Compared with LT3663EMS8E#PBF, LT3434EDD#PBF offers higher voltage/current capability at the expense of size and frequency, while LT1936EMS8E#PBF trades current-limit programmability for lower cost and identical MSOP packaging - making LT3663EMS8E#PBF optimal for thermally constrained, current-limited 1.2A designs.
Availability
LT3663EMS8E#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial PLC power distribution, and wall transformer replacement applications requiring stable component supply, long lifecycle support, and guaranteed lead-free compliance.
Supply support for LT3663EMS8E#PBF 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 all Linear power products.
The LT3663 product line was designed for rugged, high-input-voltage step-down regulation in automotive, industrial, and telecom infrastructure - emphasizing programmable current limiting, transient robustness, and minimal external component count.
FAQ
What is the maximum input voltage rating for LT3663EMS8E#PBF?
The LT3663EMS8E#PBF has an absolute maximum input voltage rating of 60V for nonrepetitive 1-second transients. Continuous operation is rated from 7.5V to 36V. This makes LT3663EMS8E#PBF suitable for automotive applications subject to load-dump events and industrial systems with unregulated 24V supplies.
Does LT3663EMS8E#PBF include internal feedback resistors for fixed 5V output?
No, LT3663EMS8E#PBF does not include internal feedback resistors. It is the adjustable version requiring external R1/R2 divider to set output voltage. Fixed-output variants (e.g., LT3663EMS8E-5#PBF) contain internal dividers; LT3663EMS8E#PBF provides design flexibility for custom VOUT values including 3.3V, 5V, or others via FB pin configuration.
How is output current limit programmed on LT3663EMS8E#PBF?
Output current limit on LT3663EMS8E#PBF is programmed by connecting a resistor (RILIM) between the ILIM pin and GND. Values from 28.7kΩ (1.2A) to 140kΩ (0.4A) set the average output current limit. Table 1 in the datasheet specifies exact RILIM values; the relationship is monotonic and temperature-stable across –40°C to +125°C.
What package type and thermal characteristics does LT3663EMS8E#PBF use?
LT3663EMS8E#PBF uses an 8-lead plastic MSOP package (MS8E) with exposed thermal pad (Pin 9, GND). Its junction-to-ambient thermal resistance is 35°C/W when mounted on a 2-layer PCB with adequate copper area and thermal vias - significantly better than the 64°C/W of the DFN variant, enabling higher sustained current in space-constrained designs.
Can LT3663EMS8E#PBF operate in pulse-skipping mode at light loads?
Yes, LT3663EMS8E#PBF enters pulse-skipping mode when input voltage rises sufficiently to reduce required duty cycle below ~12%. This occurs naturally under light-load conditions with high VIN/VOUT ratios (e.g., 30V→3.3V), maintaining regulation while reducing switching losses. Output ripple increases slightly, but no external circuitry is needed to enable or manage this behavior.
LT3663EMS8E#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT3663EMS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3663EMS8E#PBF 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#PBF reliable?
The price and inventory of LT3663EMS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3663EMS8E#PBF is usually 5 days.
3.What payment methods are accepted for LT3663EMS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3663EMS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3663EMS8E#PBF?
LT3663EMS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3663EMS8E#PBF 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#PBF?
For technical support, including LT3663EMS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3663EMS8E#PBF requirements.
6.How does Aetrix verify that LT3663EMS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LT3663EMS8E#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT3663EMS8E#PBF?
All LT3663EMS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3663EMS8E#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT3663EMS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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