My Inquiry
My Account
Analog Devices Inc. LT3663IMS8E#TRPBF
- Part No.:
- LT3663IMS8E#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3663IMS8E#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.2A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,937
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3663IMS8E#TRPBF 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), integrated boost diode, and internal compensation. It operates from 7.5V to 36V input (60V transient tolerant) and delivers regulated 5V output in an 8-lead MSOP package with exposed thermal pad. Used in automotive battery regulation and industrial power supplies where precise current limiting reduces component stress and thermal design burden.
For engineers reviewing the LT3663IMS8E#TRPBF datasheet, LT3663IMS8E#TRPBF pinout, LT3663IMS8E#TRPBF application, or LT3663IMS8E#TRPBF equivalent, key selection criteria include its 1.5MHz fixed-frequency peak-current-mode control, 275mV switch VCE(SAT) at 1A, −40°C to +125°C operating junction temperature, and compatibility with standard 5V wall adapters and 24V industrial rails.
Technical Context
The LT3663IMS8E#TRPBF implements constant-frequency, peak-current-mode control with internal slope compensation and a 1.5MHz oscillator. Its servo-based output current limit circuit uses external RILIM to set average inductor current, enabling tight system-level power dissipation control independent of output voltage.
It integrates a bipolar NPN power switch driven via an internal boost stage (using BOOST pin and internal diode), eliminating need for external bootstrap components. Input protection includes undervoltage lockout (7.5V rising threshold) and overvoltage lockout (39V typical), allowing safe operation up to 60V transients without switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±1.5% (guaranteed over −40°C to +125°C) |
| Max Output Current | 1.2A continuous load with thermal derating above 85°C ambient |
| Input Voltage Range | 7.5V to 36V DC; survives nonrepetitive 60V transients |
| Switching Frequency | 1.5MHz ±10% - enables compact 3.3µH–6.8µH inductors and low-profile ceramic input/output caps |
| Current Limit Range | Programmable 0.4A–1.2A via ILIM pin resistor (e.g., 28.7kΩ sets 1.2A) |
| Switch VCE(SAT) | 275mV at 1A - minimizes conduction loss and improves efficiency at high load |
| Thermal Resistance θJA | 35°C/W (MSOP package with exposed pad soldered to PCB ground plane) |
Pinout & Package
LT3663IMS8E#TRPBF is housed in an 8-lead plastic MSOP package (3.0mm × 4.9mm × 1.1mm) 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 (θJA = 35°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main power input | Supplies internal regulator and switch; bypass with ≥1µF X7R ceramic capacitor close to pin |
| RUN | Enable/shutdown control | Logic-high (>2.5V) enables regulation; logic-low (<0.3V) places device in <2µA shutdown mode |
| FB | Feedback reference node | Internally connected to 0.8V reference; not used in fixed-5V version (LT3663IMS8E#TRPBF) |
| ILIM | Current limit programming | Resistor-to-GND sets average output current limit (28.7kΩ → 1.2A) |
| SW | Switch node | Connects to inductor and catch diode anode; carries high di/dt pulsed current |
| BOOST | Internal switch gate drive boost | Connected to internal boost diode cathode; requires 0.1µF ceramic capacitor to SW |
| ISENSE | Current sense input | Anode of internal boost diode; connects to inductor output and VOUT via internal sense resistor |
| VOUT | Regulated output terminal | Delivers 5V output; connect ≥10µF X5R/X7R ceramic capacitor directly to this pin and GND |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diode | Eliminates external bootstrap diode and capacitor, reducing BOM count and layout area |
| Programmable output current limit | Enables precise system-level power budgeting and protects downstream components during overload |
| Fixed 5V output with no external feedback resistors | Simplifies design, eliminates resistor tolerance error, and improves long-term output stability |
| Thermally enhanced MSOP package | Exposed pad and low θJA (35°C/W) support 1.2A operation in compact industrial or automotive enclosures |
| 60V transient input protection | Allows direct connection to unregulated 24V/36V rails without external TVS or clamping circuitry |
Applications
| Automotive Battery Regulation | Distributed Supply Regulation |
|---|---|
Use Scenario: Regulating 12V–24V automotive battery rail to stable 5V for infotainment microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Primary 5V point-of-load regulator with current-limit protection against load dump and cold-crank transients. Use Value: Survives 60V transients without external protection; programmable current limit prevents fuse blowing during ECU short-circuit events. | Use Scenario: Providing isolated 5V supply to remote sensor nodes in factory automation systems powered from 24V DC bus. IC Role / Device Role / Timing Role: Compact, thermally efficient local regulator replacing linear regulators in space-constrained DIN-rail modules. Use Value: 1.5MHz switching enables small 3.3µH inductor and 22µF ceramic output cap; 35°C/W θJA sustains full 1.2A at 70°C ambient. |
| Industrial Power Supplies | Wall Transformer Regulation |
Use Scenario: Converting unregulated 24V industrial supply to clean 5V for PLC I/O modules and fieldbus interface ICs. IC Role / Device Role / Timing Role: High-reliability buck converter with UVLO/OVLO and thermal shutdown for harsh factory environments. Use Value: Guaranteed −40°C to +125°C operation supports extended temperature range requirements; internal compensation avoids loop-stability tuning. | Use Scenario: Replacing inefficient 7805 linear regulators in AC/DC wall adapters delivering 5V/1A to consumer electronics. IC Role / Device Role / Timing Role: Efficient drop-in replacement for legacy linear regulators, reducing heat sink size and improving adapter efficiency. Use Value: >90% efficiency at 1A load (VIN=12V) cuts thermal dissipation by >75% vs. linear solution; MSOP package fits existing footprints. |
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 | Higher current, lower frequency - suited for high-power, low-EMI designs with larger magnetics | Select when >1.2A output or 60V continuous input is required; requires external compensation and more board area |
| LT1936EMS8E#TRPBF | 36V input, 1.4A output, 500kHz switching, same MSOP-8 package | Lower frequency, higher quiescent current (1.9mA vs. 3.2mA), no programmable current limit | Select when cost-sensitive designs prioritize simplicity over current-limit precision; lacks OVLO/UVLO hysteresis control |
Compared with LT3434EDD#TRPBF and LT1936EMS8E#TRPBF, the LT3663IMS8E#TRPBF uniquely combines 1.5MHz operation, programmable current limiting, and 5V fixed output in an MSOP-8 package-enabling smaller magnetics, tighter thermal management, and system-level power control not available in either alternative.
Availability
LT3663IMS8E#TRPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial power supplies, and wall transformer regulation requiring stable component supply across extended temperature ranges and high-reliability production programs.
Supply support for LT3663IMS8E#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, high-efficiency step-down regulation in automotive, industrial, and distributed power systems where input transients, thermal constraints, and precise current limiting are critical.
FAQ
What is the guaranteed operating temperature range for LT3663IMS8E#TRPBF?
The LT3663IMS8E#TRPBF is specified for operation from −40°C to +125°C junction temperature. This rating applies across all electrical parameters including output voltage accuracy (±1.5%), current limit (±10%), and switching frequency (±10%). The MSOP package's exposed pad must be soldered to a thermal ground plane to maintain this range under full 1.2A load.
Does LT3663IMS8E#TRPBF require external feedback resistors to set the output voltage?
No. The LT3663IMS8E#TRPBF is the fixed 5V output variant - its internal resistor divider is laser-trimmed to regulate precisely to 5V ±1.5%. The FB pin is not connected externally and should remain unpopulated. This eliminates resistor tolerance errors and simplifies layout versus adjustable versions like LT3663EMS8E#TRPBF.
How is the output current limit programmed on LT3663IMS8E#TRPBF?
The LT3663IMS8E#TRPBF uses an external resistor (RILIM) from the ILIM pin to GND to set the average output current limit. For example, a 28.7kΩ resistor programs 1.2A (±10%). Table 1 in the datasheet provides exact RILIM values for 0.4A–1.2A limits. The current limit remains stable over temperature (±5% variation from −40°C to +125°C).
What is the purpose of the BOOST pin on LT3663IMS8E#TRPBF?
The BOOST pin on LT3663IMS8E#TRPBF supplies gate drive voltage to the internal bipolar NPN switch, generated via an internal diode and external 0.1µF capacitor tied to the SW node. This ensures full saturation of the switch even at high input voltages, minimizing VCE(SAT) (275mV at 1A) and maximizing efficiency. No external diode is needed.
Can LT3663IMS8E#TRPBF operate safely with a 48V input source?
LT3663IMS8E#TRPBF is rated for continuous input up to 36V and nonrepetitive transients up to 60V. A sustained 48V input exceeds its absolute maximum rating and risks permanent damage. For 48V systems, use an upstream pre-regulator or select a higher-voltage part such as LT3434EDD#TRPBF (60V continuous) - the LT3663IMS8E#TRPBF must not be operated at 48V.
LT3663IMS8E#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
LT3663IMS8E#TRPBF FAQ
1.How can I place an order for LT3663IMS8E#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3663IMS8E#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 LT3663IMS8E#TRPBF reliable?
The price and inventory of LT3663IMS8E#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3663IMS8E#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3663IMS8E#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3663IMS8E#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3663IMS8E#TRPBF?
LT3663IMS8E#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3663IMS8E#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 LT3663IMS8E#TRPBF?
For technical support, including LT3663IMS8E#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3663IMS8E#TRPBF requirements.
6.How does Aetrix verify that LT3663IMS8E#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3663IMS8E#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 LT3663IMS8E#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3663IMS8E#TRPBF?
All LT3663IMS8E#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3663IMS8E#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 LT3663IMS8E#TRPBF part is unused and in its original packaging.
Return procedure for LT3663IMS8E#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3663IMS8E#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
