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Analog Devices Inc. LT3663IMS8E-5#PBF
- Part No.:
- LT3663IMS8E-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3663IMS8E-5#PBF.pdf
- Description:
- IC REG BUCK 5V 1.2A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:135
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Product details
Overview
LT3663IMS8E-5#PBF from Analog Devices (formerly Linear Technology) is a 5V fixed-output, 1.2A step-down switching regulator with programmable output current limit (0.4–1.2A), 7.5V–36V input range, and integrated boost diode. It operates at 1.5MHz fixed frequency in peak current mode, features internal compensation, thermal shutdown, and overvoltage/undervoltage lockout - designed for automotive battery regulation and industrial 24V supply conversion.
For engineers reviewing the LT3663IMS8E-5#PBF datasheet, LT3663IMS8E-5#PBF pinout, LT3663IMS8E-5#PBF application, or LT3663IMS8E-5#PBF equivalent, key selection criteria include its MSOP-8 thermally enhanced package, 5V fixed output with ±1.5% regulation, 0.8V feedback reference, and precise current-limit programming via ILIM resistor - critical for power path component sizing and thermal management in compact 12V/24V systems.
Technical Context
The LT3663IMS8E-5#PBF implements constant-frequency peak current mode control with an internal bipolar NPN switch (VCESAT = 275mV @ 1A) and integrated boost diode to drive the BOOST pin above VIN for full saturation. Its servo-based output current limit circuit compares ISENSE voltage against a reference set by RILIM, enabling accurate average-current limiting independent of load transients.
It integrates undervoltage lockout (7.5V rising threshold), overvoltage lockout (39V typical), and thermal protection. The device uses internal compensation on the VC node and supports pulse-skipping at low loads while maintaining regulation - with minimum on-time of ~100ns and maximum duty cycle of 92%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.5% - eliminates external feedback divider, simplifies layout and improves stability. |
| Max Output Current | 1.2A continuous - enables use with standard 1.2A-rated inductors and Schottky diodes in space-constrained designs. |
| Input Voltage Range | 7.5V to 36V (60V transient tolerant) - supports unregulated 12V wall adapters, 24V industrial rails, and automotive cold-crank conditions. |
| Switching Frequency | 1.5MHz typical - allows use of small 3.3–6.8µH inductors and ceramic capacitors, reducing solution size. |
| Current Limit Range | 0.4A to 1.2A programmable via ILIM pin - permits precise system-level power dissipation control and component derating. |
| Feedback Reference | 0.800V ±2% - sets accuracy of external adjustable versions; fixed 5V version internally references this node. |
| Thermal Resistance θJA | 35°C/W (MSOP-8 with exposed pad) - enables 1.2A operation up to +125°C ambient with minimal PCB copper area. |
Pinout & Package
LT3663IMS8E-5#PBF is housed in an 8-lead plastic MSOP package (3.0mm × 3.0mm) with exposed thermal pad (Pin 9 = GND). The exposed pad must be soldered to a PCB ground plane with ≥4 thermal vias for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input power supply connection | Accepts 7.5–36V; withstands 60V transients; requires local 2.2µF ceramic bypass. |
| RUN | Enable/shutdown control input | Logic-high (>2.5V) enables regulation; grounded disables IC with 2µA shutdown current. |
| FB | Feedback reference node | Internally regulated to 0.800V; unused in fixed-5V version but retained for compatibility. |
| ILIM | Output current limit programming | Resistor-to-GND sets average output current limit (e.g., 28.7kΩ = 1.2A). |
| SW | Switch node | Drives external inductor; high dv/dt node requiring short, low-inductance routing. |
| BOOST | Internal switch gate drive booster | Connected to cathode of internal boost diode; requires 0.1µF capacitor to SW for NPN saturation. |
| ISENSE | Current sense amplifier positive input | Connects to anode of internal boost diode and positive end of output current sense resistor. |
| VOUT | Regulated output connection | Delivers 5.0V; requires ≥22µF ceramic output capacitance for ripple and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diode | Eliminates external Schottky diode for BOOST capacitor charging - reduces BOM count and layout complexity. |
| Programmable output current limit | 0.4–1.2A via single ILIM resistor - enables precise thermal design and protects downstream components during overload. |
| Thermally enhanced MSOP-8 | θJA = 35°C/W with exposed pad - delivers full 1.2A output at +125°C ambient without heatsink or airflow. |
| Wide input transient tolerance | Withstands 60V non-repetitive transients - suitable for automotive load-dump and industrial surge environments. |
| Internal compensation | No external compensation network required - simplifies design validation and improves production yield. |
Applications
| Automotive Battery Regulation | Industrial 24V Supply Conversion |
|---|---|
|
Use Scenario: Regulating vehicle battery (9–16V nominal, up to 60V transients) to stable 5V for infotainment microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Primary 5V buck converter with current limiting to prevent fuse blowout during ECU short-circuit faults. Use Value: 60V transient tolerance and programmable 1.2A current limit enable direct connection to battery rail without pre-regulator - reducing bill-of-materials and board area. |
Use Scenario: Converting 24V factory automation bus to 5V for PLC I/O modules and sensor interface circuitry operating in harsh EMI environments. IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC/DC stage delivering clean 5V under continuous 1.2A load at 70°C ambient. Use Value: 35°C/W θJA and internal compensation ensure stable operation without thermal throttling or external loop tuning - accelerating time-to-market for industrial designs. |
| Wall Transformer Regulation | Distributed Supply Regulation |
|
Use Scenario: Down-converting unregulated 12V AC/DC wall adapter output (10–18V) to tightly regulated 5V for USB-powered peripherals and embedded gateways. IC Role / Device Role / Timing Role: Fixed-output buck regulator with UVLO (7.5V) and OVLO (39V) to handle brownouts and overvoltage events from low-cost adapters. Use Value: 1.5MHz switching frequency allows use of miniature 3.3µH inductors and 22µF ceramic output caps - enabling ultra-thin power supply form factors. |
Use Scenario: Local point-of-load regulation in multi-rail systems where 5V is distributed across a backplane and locally stepped down near FPGA or DSP cores. IC Role / Device Role / Timing Role: Compact, self-contained 5V regulator minimizing voltage drop and noise coupling in high-speed digital subsystems. Use Value: Integrated boost diode and internal compensation reduce component count to just inductor, input/output caps, and ILIM resistor - improving reliability and reducing layout risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1936EDD-5#PBF | Same MSOP-8 package, 5V fixed output, but lower 1.4A rating and 500kHz switching frequency; no programmable current limit. | Lacks ILIM pin and current limiting - unsuitable where system-level power dissipation control is required. | Select LT1936EDD-5#PBF only when lower frequency and simpler control are acceptable, and current limiting is handled externally. |
| LTC3632EMSE-5#PBF | 5V fixed output, 1.2A, 3mm × 4mm MSOP-10, 2MHz operation, but requires external bootstrap diode and has no ILIM pin. | Higher frequency enables smaller magnetics but adds external component and lacks programmable current limit. | Choose LTC3632EMSE-5#PBF if 2MHz operation is mandatory and thermal performance is less critical than footprint reduction. |
Compared with LT1936EDD-5#PBF and LTC3632EMSE-5#PBF, the LT3663IMS8E-5#PBF uniquely combines 1.5MHz switching, programmable current limiting, integrated boost diode, and 60V transient tolerance in an industry-standard MSOP-8 - making it optimal for automotive and industrial applications demanding both robustness and design simplicity.
Availability
LT3663IMS8E-5#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial 24V supply conversion, and wall transformer regulation requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned reliability.
Supply support for LT3663IMS8E-5#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 its legacy of high-performance analog and power management ICs, with emphasis on precision, reliability, and ruggedized operation.
The LT3663 product line was designed specifically for wide-input, current-limited step-down regulation in automotive, industrial, and telecom infrastructure - prioritizing transient robustness, thermal efficiency, and system-level power control.
FAQ
What is the guaranteed operating temperature range for the LT3663IMS8E-5#PBF?
The LT3663IMS8E-5#PBF is specified for operation from –40°C to +125°C junction temperature. Its I-grade qualification ensures full electrical performance across this range, including output voltage accuracy, current limit tolerance, and thermal shutdown activation - critical for under-hood automotive and industrial control cabinet deployments where ambient temperatures exceed 85°C.
Does the LT3663IMS8E-5#PBF require an external feedback resistor divider?
No. The LT3663IMS8E-5#PBF is a fixed 5V output variant; its internal resistor divider is factory-trimmed to regulate VOUT to 5.0V ±1.5%. The FB pin remains accessible for compatibility but is not used in normal operation - eliminating external resistor selection errors and layout sensitivity associated with adjustable versions.
How is output current limit programmed on the LT3663IMS8E-5#PBF?
Output current limit is set by connecting a resistor (RILIM) between the ILIM pin and GND. For the LT3663IMS8E-5#PBF configured for 1.2A output, a 28.7kΩ resistor is used. The relationship is linear: 0.4A requires 140kΩ, 0.6A requires 75kΩ, and 1.2A requires 28.7kΩ - enabling precise system-level power budgeting without redesigning the power stage.
Can the LT3663IMS8E-5#PBF operate with a 48V input source?
No. While the LT3663IMS8E-5#PBF withstands 60V non-repetitive transients, its absolute maximum continuous input voltage is 36V. Sustained operation above 36V violates Absolute Maximum Ratings and risks permanent damage. For 48V systems, a pre-regulator or alternative 60V-rated part like LT3434 must be used upstream of the LT3663IMS8E-5#PBF.
What is the purpose of the BOOST pin on the LT3663IMS8E-5#PBF?
The BOOST pin supplies elevated gate drive voltage to the internal bipolar NPN switch, ensuring full saturation and low VCESAT (275mV @ 1A). It is charged via the internal boost diode and an external 0.1µF capacitor connected between BOOST and SW - enabling high efficiency across the full input range without external charge-pump circuitry.
LT3663IMS8E-5#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:
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LT3663IMS8E-5#PBF FAQ
1.How can I place an order for LT3663IMS8E-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3663IMS8E-5#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 LT3663IMS8E-5#PBF reliable?
The price and inventory of LT3663IMS8E-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3663IMS8E-5#PBF is usually 5 days.
3.What payment methods are accepted for LT3663IMS8E-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3663IMS8E-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3663IMS8E-5#PBF?
LT3663IMS8E-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3663IMS8E-5#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 LT3663IMS8E-5#PBF?
For technical support, including LT3663IMS8E-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3663IMS8E-5#PBF requirements.
6.How does Aetrix verify that LT3663IMS8E-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT3663IMS8E-5#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 LT3663IMS8E-5#PBF meets industry standards.
7.What is the process for return or replacement of LT3663IMS8E-5#PBF?
All LT3663IMS8E-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3663IMS8E-5#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 LT3663IMS8E-5#PBF part is unused and in its original packaging.
Return procedure for LT3663IMS8E-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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