My Inquiry
My Account
Analog Devices Inc. LT3663IDCB-5#TRMPBF
- Part No.:
- LT3663IDCB-5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3663IDCB-5#TRMPBF.pdf
- Description:
- IC REG BUCK 5V 1.2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:500
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3663IDCB-5#TRMPBF from Analog Devices (formerly Linear Technology) is a 5V fixed-output, 1.2A step-down switching regulator with programmable output current limit and integrated boost diode. It operates from 7.5V to 36V input, features 1.5MHz fixed-frequency peak current mode control, 275mV switch VCE(SAT) at 1A, and thermal shutdown - designed for automotive battery regulation and industrial 24V supply conversion.
For engineers reviewing the LT3663IDCB-5#TRMPBF datasheet, LT3663IDCB-5#TRMPBF pinout, LT3663IDCB-5#TRMPBF application, or LT3663IDCB-5#TRMPBF equivalent, key selection criteria include its 5V fixed output, –40°C to 125°C operating temperature grade, 8-lead 2mm × 3mm DFN package with exposed GND pad, and programmable 0.4A–1.2A output current limit via ILIM resistor.
Technical Context
The LT3663IDCB-5#TRMPBF implements constant-frequency peak current mode control with internal compensation and an integrated bipolar NPN power switch. Its BOOST pin generates a voltage >VIN via an internal diode and external capacitor to ensure full switch saturation, enabling high efficiency across wide input ranges.
It integrates undervoltage lockout (7.5V rising), overvoltage lockout (39V typical), low-current shutdown (≤2µA), and active current-limit servo control via ISENSE/ILIM. The fixed 5V output eliminates external feedback resistors, and the 8-pin DFN package provides θJA = 64°C/W with mandatory soldered exposed pad for thermal management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.5% (3.3V and 5V versions available; this part is 5V) |
| Max Output Current | 1.2A continuous (programmable 0.4A–1.2A via ILIM resistor) |
| Input Voltage Range | 7.5V to 36V continuous, withstands 60V transients |
| Switching Frequency | 1.5MHz typical (fixed, enables compact LC filter design) |
| Switch VCE(SAT) | 275mV at 1A (low conduction loss improves efficiency at high load) |
| Operating Temp Range | –40°C to +125°C junction (I-grade, qualified for automotive and industrial use) |
| Package | 8-lead 2mm × 3mm plastic DFN with exposed GND pad (DCB) |
Pinout & Package
LT3663IDCB-5#TRMPBF uses an 8-lead (2mm × 3mm) plastic DFN package (DCB) with exposed GND pad (Pin 9), requiring PCB soldering for thermal and electrical performance. θJA = 64°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input power supply | Accepts 7.5V–36V; bypass with ≥1µF ceramic capacitor close to pin |
| RUN | Enable/shutdown control | Logic-high ≥2.5V enables operation; tie to GND for shutdown (≤2µA IQ) |
| FB | Feedback reference | Internally tied to 5V output divider; not accessible on fixed-output variants |
| ILIM | Current limit programming | Resistor-to-GND sets average output current limit (e.g., 28.7kΩ = 1.2A) |
| SW | Switch node | Connects to inductor and catch diode; carries high dI/dt pulsed current |
| BOOST | Boost capacitor drive | Supplies >VIN gate drive to internal switch; requires 0.1µF ceramic capacitor |
| ISENSE | Current sense input | Positive terminal of internal current-sense resistor; also anode of internal boost diode |
| VOUT | Regulated output | 5V output; connect output capacitor (≥10µF ceramic) directly to this pin and GND |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diode | Eliminates external Schottky diode, reducing BOM count and board area |
| Programmable output current limit | 0.4A–1.2A via single ILIM resistor - enables precise system-level power dissipation control |
| Wide input voltage range | 7.5V–36V with 60V transient tolerance - supports unregulated 12V/24V supplies and automotive cold-crank conditions |
| Thermally enhanced DFN | Exposed GND pad and 2mm × 3mm footprint enable high-power density in space-constrained designs |
| Internal compensation | Reduces external components and simplifies stability tuning - no external compensation network required |
Applications
| Automotive Battery Regulation | Industrial 24V Supply Conversion |
|---|---|
|
Use Scenario: Regulating vehicle battery (9V–16V nominal, up to 60V load dump) to stable 5V for infotainment microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: Primary 5V buck converter with overvoltage protection and thermal shutdown - ensures safe operation during alternator surges and engine cranking. Use Value: Withstands 60V transients and operates down to 7.5V, eliminating need for upstream TVS or pre-regulator stages in cost-sensitive automotive modules. |
Use Scenario: Converting 24V factory floor power to 5V for PLC I/O modules, sensor interfaces, and industrial Ethernet PHYs. IC Role / Device Role / Timing Role: Fixed-output DC/DC regulator delivering 1.2A at 5V with programmable current limit to protect downstream circuitry during short circuits. Use Value: Programmable 0.4A–1.2A current limit allows one BOM to support multiple load configurations without redesigning power stage components. |
| Distributed Supply Regulation | Wall Transformer Regulation |
|
Use Scenario: Local point-of-load regulation in multi-rail systems where centralized 12V or 24V bus powers distributed sub-systems. IC Role / Device Role / Timing Role: Compact, thermally efficient 5V regulator placed near noise-sensitive loads - minimizes IR drop and EMI from long traces. Use Value: 1.5MHz switching frequency enables small 4.7µH–10µH inductors and <10µF output capacitance, reducing solution size by >30% vs. lower-frequency alternatives. |
Use Scenario: Regulating unregulated 12V wall adapter outputs (±20% tolerance, high ripple) to clean 5V for USB peripherals and embedded controllers. IC Role / Device Role / Timing Role: Input-tolerant buck converter with UVLO (7.5V) and OVP (39V) - prevents malfunction during brownouts or adapter faults. Use Value: Integrated boost diode and internal compensation reduce bill-of-materials to only inductor, input/output caps, and ILIM resistor - accelerating prototyping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE-5#PBF | 5V fixed, 1.2A, 3MHz sync buck; requires external bootstrap capacitor; no integrated boost diode | Higher frequency enables smaller magnetics but demands tighter layout; lacks transient robustness (max VIN = 38V, no 60V rating) | Choose when board space is critical and input transients are controlled; avoid for automotive load-dump environments. |
| LT8610ACIMSE#PBF | 5V fixed, 3.5A, 2MHz sync buck; 3.4V–42V input; integrated MOSFETs; no ILIM pin | Higher current capability and wider input range, but no programmable current limit - less precise system-level power control | Choose for higher load headroom or stricter EMI requirements (silent switcher architecture); not suitable where adjustable current limiting is mandatory. |
Compared with LTC3631EMSE-5#PBF and LT8610ACIMSE#PBF, the LT3663IDCB-5#TRMPBF uniquely combines 60V transient tolerance, programmable current limiting, and integrated boost diode in a compact DFN - making it optimal for ruggedized 24V/automotive systems requiring predictable fault behavior and minimal external components.
Availability
LT3663IDCB-5#TRMPBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial 24V supply conversion, and distributed supply regulation requiring stable component supply, extended temperature operation, and long-term lifecycle continuity.
Supply support for LT3663IDCB-5#TRMPBF 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 reliability, precision, and rugged operation in harsh environments.
The LT3663 product line delivers robust, fixed-output step-down regulators optimized for industrial and automotive applications where wide input range, transient immunity, and programmable current limiting are essential - exemplified by the LT3663IDCB-5#TRMPBF's 7.5V–36V operation and 60V surge tolerance.
FAQ
What is the output voltage accuracy of the LT3663IDCB-5#TRMPBF?
The LT3663IDCB-5#TRMPBF delivers a fixed 5.0V output with ±1.5% accuracy over line, load, and temperature (–40°C to 125°C). This specification is guaranteed for the I-grade version and reflects tight internal resistor divider matching and reference stability - critical for powering microcontrollers and communication interfaces that require stable 5V rails.
Does the LT3663IDCB-5#TRMPBF require external compensation components?
No, the LT3663IDCB-5#TRMPBF is internally compensated. Its control loop is stabilized using an integrated pole-zero network on the VC node, eliminating the need for external compensation capacitors or resistors. This simplifies design, reduces component count, and ensures consistent stability across all operating conditions without tuning.
How is output current limiting implemented in the LT3663IDCB-5#TRMPBF?
The LT3663IDCB-5#TRMPBF implements average output current limiting via the ILIM pin: a resistor from ILIM to GND programs the limit between 0.4A and 1.2A (e.g., 28.7kΩ sets 1.2A). An internal amplifier compares the voltage across the internal sense resistor to a reference derived from RILIM, then pulls down the error amplifier output to reduce duty cycle if the limit is exceeded.
What is the purpose of the BOOST pin on the LT3663IDCB-5#TRMPBF?
The BOOST pin on the LT3663IDCB-5#TRMPBF provides a voltage higher than VIN to fully saturate the internal bipolar NPN power switch. It connects to an external 0.1µF capacitor and the cathode of the internal boost diode (anode at ISENSE). Maintaining BOOST ≥2.3V above SW ensures low VCE(SAT) and high efficiency - especially critical at high input voltages.
Can the LT3663IDCB-5#TRMPBF operate with input voltages below 7.5V?
No - the LT3663IDCB-5#TRMPBF has a guaranteed undervoltage lockout (UVLO) threshold of 7.5V (rising), with 500mV hysteresis. Operation below 7.0V is not functional; the device remains in shutdown until VIN exceeds 7.5V. This protects against unstable regulation during brownout conditions and ensures reliable startup from nominal 12V or 24V sources.
LT3663IDCB-5#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-DFN (2x3)
LT3663IDCB-5#TRMPBF FAQ
1.How can I place an order for LT3663IDCB-5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3663IDCB-5#TRMPBF 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 LT3663IDCB-5#TRMPBF reliable?
The price and inventory of LT3663IDCB-5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3663IDCB-5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT3663IDCB-5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3663IDCB-5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3663IDCB-5#TRMPBF?
LT3663IDCB-5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3663IDCB-5#TRMPBF 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 LT3663IDCB-5#TRMPBF?
For technical support, including LT3663IDCB-5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3663IDCB-5#TRMPBF requirements.
6.How does Aetrix verify that LT3663IDCB-5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT3663IDCB-5#TRMPBF 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 LT3663IDCB-5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT3663IDCB-5#TRMPBF?
All LT3663IDCB-5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3663IDCB-5#TRMPBF, 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 LT3663IDCB-5#TRMPBF part is unused and in its original packaging.
Return procedure for LT3663IDCB-5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3663IDCB-5#TRMPBF 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…
