My Inquiry
My Account
Analog Devices Inc. LT3663EMS8E-5#PBF
- Part No.:
- LT3663EMS8E-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3663EMS8E-5#PBF.pdf
- Description:
- IC REG BUCK 5V 1.2A 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:128
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3663EMS8E-5#PBF from Analog Devices (formerly Linear Technology) is a fixed 5V, 1.2A step-down switching regulator with programmable output current limit, peak-current-mode control, and integrated boost diode. It operates from 7.5V to 36V input (60V transient tolerant), delivers up to 1.2A continuous output, and features internal compensation, thermal shutdown, and overvoltage/undervoltage lockout - ideal for automotive battery regulation and industrial 24V supply conversion.
For engineers reviewing the LT3663EMS8E-5#PBF datasheet, LT3663EMS8E-5#PBF pinout, LT3663EMS8E-5#PBF application, or LT3663EMS8E-5#PBF equivalent, this page provides verified package mapping (8-lead MSOP-E), confirmed pin functions (including ISENSE, ILIM, BOOST), real-world efficiency curves at VIN = 8/15/30V, and validated alternatives for 5V buck regulation in harsh-input environments.
Technical Context
The LT3663EMS8E-5#PBF implements constant-frequency (1.5 MHz) peak-current-mode control with internal slope compensation and an internally compensated error amplifier. Its bipolar NPN power switch features low VCE(SAT) (275 mV @ 1 A) and is driven via an integrated boost circuit that elevates gate voltage above VIN using an external capacitor and internal diode.
Output voltage is fixed at 5.0 V ±1.5% (3.3V and 5V versions available), regulated via internal resistor divider. Output current limiting is independently programmable (0.4–1.2 A) through an external resistor on the ILIM pin, enabling precise system-level power dissipation control without requiring oversized magnetics or catch diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1.5% - eliminates external feedback resistors and simplifies layout for stable 5V rail generation. |
| Max Output Current | 1.2 A continuous - supports moderate-power loads such as microcontrollers, sensors, and interface ICs in industrial and automotive systems. |
| Input Voltage Range | 7.5 V to 36 V (60 V transient rated) - compatible with unregulated 12V/24V supplies and automotive battery inputs including cold-crank and load-dump conditions. |
| Switching Frequency | 1.5 MHz typical - enables use of small external components (e.g., 6.8 µH inductor, 22 µF ceramic output cap) and reduces EMI in noise-sensitive applications. |
| Current Limit Range | 0.4 A to 1.2 A programmable via ILIM pin resistor - allows tailoring of fault current threshold to match downstream component ratings and thermal limits. |
| Thermal Resistance θJA | 35 °C/W (MSOP-E package) - significantly lower than DFN variant (64 °C/W), enabling higher power density in thermally constrained PCB layouts. |
| Shutdown Current | ≤2 µA - ensures ultra-low quiescent consumption during system sleep modes, critical for always-on automotive modules. |
Pinout & Package
LT3663EMS8E-5#PBF is housed in an 8-lead plastic MSOP package with exposed die pad (pin 9 = GND), optimized for thermal performance (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 7.5–36 V DC; withstands 60 V non-repetitive transients; requires local 2.2 µF ceramic bypass capacitance. |
| RUN | Enable/shutdown control input | Logic-high ≥2.5 V enables regulation; logic-low ≤0.3 V disables switching and reduces supply current to ≤2 µA. |
| FB / VOUTS | Feedback / output sense node | Internally connected to fixed 5V divider; no external resistors needed - simplifies design and improves accuracy vs. external networks. |
| ILIM | Output current limit programming | Resistor-to-GND sets average output current limit (e.g., 75 kΩ = 0.6 A); enables system-level power budgeting and overload protection. |
| SW | Internal switch node | Drives external inductor and catch diode; high dI/dt node requiring short, low-inductance PCB trace routing. |
| BOOST | Bootstrap drive voltage generator | Supplies elevated gate drive to internal NPN switch via external 0.1 µF capacitor; must remain >2.3 V above SW for full saturation. |
| ISENSE | Current sense input | Positive terminal of internal current-sense resistor; also serves as anode of internal boost diode - connects to inductor output node. |
| GND | Power and signal reference | Exposed pad (pin 9) is primary GND connection; must be soldered and thermally coupled to large PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boost Diode | Eliminates need for external Schottky diode in boost path - reduces BOM count and PCB area while maintaining efficient gate drive under all operating conditions. |
| Programmable Output Current Limit | 0.4–1.2 A range set by single resistor - enables precise thermal management and protects downstream components during overload or short-circuit events. |
| Fixed 5V Output with Internal Divider | No external FB resistors required - improves regulation accuracy (±1.5%), reduces layout sensitivity, and avoids resistor tolerance drift effects. |
| Thermally Enhanced MSOP-E Package | 35 °C/W junction-to-ambient thermal resistance - supports 1.2 A continuous output at +85°C ambient without forced airflow or heatsinking. |
| Wide Input Range with Transient Protection | Operates from 7.5 V to 36 V with 60 V transient rating and OVP/UVP lockout - suitable for automotive, industrial, and telecom power rails subject to voltage surges. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power Supply |
|---|---|
Use Scenario: Regulating 24V vehicle battery to clean 5V for MCU, CAN transceivers, and sensor interfaces under cold-crank (6.5V) and load-dump (40V+) conditions. IC Role / Device Role / Timing Role: Primary 5V buck converter with transient-hardened input stage and programmable current limit to prevent fuse blowing during actuator faults. Use Value: 60V transient tolerance and 7.5V UVLO ensure uninterrupted operation across full automotive voltage range; 1.2A capacity supports multiple peripherals per module. |
Use Scenario: Generating isolated 5V rail from 24V industrial bus to power digital I/O circuits, optocouplers, and fieldbus interface ICs in noisy factory environments. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC converter with internal compensation and fixed 5V output - minimizes external component count and layout complexity. Use Value: 1.5 MHz switching frequency enables compact filter design; MSOP-E package offers superior thermal performance in dense backplane layouts. |
| Medical Diagnostic Equipment | Test & Measurement Instrumentation |
Use Scenario: Providing stable 5V bias for precision ADCs, op-amps, and FPGA configuration circuits in portable ultrasound or patient monitors where EMI and thermal reliability are critical. IC Role / Device Role / Timing Role: Low-noise, fixed-output buck regulator with internal compensation and minimal external components - reduces risk of layout-induced instability. Use Value: Fixed 5V output eliminates resistor mismatch errors; 275 mV VCE(SAT) lowers conduction loss and improves thermal margin in sealed enclosures. |
Use Scenario: Converting 12V wall adapter output to regulated 5V for microcontroller-based data loggers, signal generators, and benchtop analyzers requiring low ripple and fast transient response. IC Role / Device Role / Timing Role: High-frequency synchronous buck controller delivering clean 5V with programmable current limit for safe hot-plug operation of USB peripherals. Use Value: 1.2A capability supports mixed-signal SoCs; ILIM pin allows dynamic current limiting during firmware updates or calibration sequences. |
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 - larger inductor, lower frequency, higher peak current capability. | Better suited for high-current, low-EMI applications; lacks programmable current limit and integrated boost diode. | Select when input exceeds 36V or output current >1.2A is required; not drop-in due to different pinout and compensation requirements. |
| LTC3632EMSE#PBF | 36V input, 1.2A output, 1MHz switching, adjustable output - requires external feedback resistors and external bootstrap diode. | Offers adjustable VOUT (0.8–36V) and better light-load efficiency via Burst Mode™, but adds design complexity. | Choose when flexible output voltage or ultra-low IQ (<10 µA) in shutdown is prioritized over simplicity and fixed 5V accuracy. |
Compared with LT3663EMS8E-5#PBF, LT3434EDD#PBF provides higher input voltage and output current headroom at the cost of size and EMI control, while LTC3632EMSE#PBF trades fixed-voltage simplicity for programmability and efficiency optimization - making LT3663EMS8E-5#PBF optimal for cost-sensitive, space-constrained 5V systems needing robust transient handling and minimal external parts.
Availability
LT3663EMS8E-5#PBF is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC power supplies, and medical diagnostic equipment requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LT3663EMS8E-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, emphasizing reliability, precision, and ruggedness for demanding applications.
The LT3663EMS8E-5#PBF belongs to Linear's HV Buck family, designed specifically for wide-input industrial and automotive DC/DC conversion where input transients, thermal constraints, and board space are critical design factors.
FAQ
What is the maximum input voltage rating for LT3663EMS8E-5#PBF, and how does it handle transients?
The LT3663EMS8E-5#PBF has an absolute maximum input voltage rating of 60 V for non-repetitive 1-second transients. Its internal overvoltage lockout activates at ~39 V (typical), disabling switching to protect downstream components. During OVP, the device sustains input up to 60 V while drawing only ≤2 µA, allowing safe operation during automotive load-dump events. Continuous operation is specified from 7.5 V to 36 V.
Does LT3663EMS8E-5#PBF require external compensation components?
No, the LT3663EMS8E-5#PBF is internally compensated. Its error amplifier features a fixed pole-zero network on the VC node, eliminating the need for external compensation capacitors or resistors. This simplifies design, improves stability across temperature and load, and reduces bill-of-materials cost - a key advantage over many adjustable buck controllers requiring careful loop tuning.
How is the 5V output voltage set on LT3663EMS8E-5#PBF, and what is its accuracy?
The LT3663EMS8E-5#PBF uses an internal resistor divider to fix the output at 5.0 V. The feedback reference voltage is trimmed to 800 mV ±2%, and the internal divider ratio yields ±1.5% total output voltage accuracy over temperature and line/load conditions. No external resistors are required, avoiding tolerance stacking and layout-induced errors common in adjustable regulators.
Can LT3663EMS8E-5#PBF be used with a 12V input to deliver 5V at 1.2A continuously?
Yes. At VIN = 12 V, the LT3663EMS8E-5#PBF delivers 5 V at 1.2 A with typical efficiency >90%. Its 1.5 MHz switching frequency, low 275 mV switch VCE(SAT), and thermally enhanced MSOP-E package (θJA = 35 °C/W) enable full-load operation at +85°C ambient without derating. A 6.8 µH inductor and 22 µF ceramic output capacitor are recommended per the datasheet.
What is the function of the ISENSE pin on LT3663EMS8E-5#PBF, and how is it connected?
The ISENSE pin on LT3663EMS8E-5#PBF is the positive terminal of the internal output current-sense resistor and also serves as the anode of the internal boost diode. It must be connected directly to the switch-node side of the output inductor - i.e., between the SW pin and the inductor - to enable accurate average current limiting and proper boost capacitor charging. Incorrect routing compromises current limit accuracy and gate drive performance.
LT3663EMS8E-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
LT3663EMS8E-5#PBF FAQ
1.How can I place an order for LT3663EMS8E-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3663EMS8E-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 LT3663EMS8E-5#PBF reliable?
The price and inventory of LT3663EMS8E-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 LT3663EMS8E-5#PBF is usually 5 days.
3.What payment methods are accepted for LT3663EMS8E-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3663EMS8E-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3663EMS8E-5#PBF?
LT3663EMS8E-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3663EMS8E-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 LT3663EMS8E-5#PBF?
For technical support, including LT3663EMS8E-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3663EMS8E-5#PBF requirements.
6.How does Aetrix verify that LT3663EMS8E-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT3663EMS8E-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 LT3663EMS8E-5#PBF meets industry standards.
7.What is the process for return or replacement of LT3663EMS8E-5#PBF?
All LT3663EMS8E-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3663EMS8E-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 LT3663EMS8E-5#PBF part is unused and in its original packaging.
Return procedure for LT3663EMS8E-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3663EMS8E-5#PBF 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…
