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Analog Devices Inc. LT3663EDCB-3.3#TRPBF
- Part No.:
- LT3663EDCB-3.3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT3663EDCB-3.3#TRPBF.pdf
- Description:
- IC REG BUCK 3.3V 1.2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,579
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Product details
Overview
LT3663EDCB-3.3#TRPBF from Analog Devices (formerly Linear Technology) is a 3.3V fixed-output, 1.2A step-down switching regulator with programmable output current limit, wide 7.5V–36V input range, integrated boost diode, and internal compensation in an 8-lead 2mm × 3mm DFN package. It delivers regulated 3.3V power for industrial supplies and automotive battery systems requiring transient robustness up to 60V.
For engineers reviewing the LT3663EDCB-3.3#TRPBF datasheet, LT3663EDCB-3.3#TRPBF pinout, LT3663EDCB-3.3#TRPBF application, or LT3663EDCB-3.3#TRPBF equivalent, key selection criteria include its 1.5MHz fixed-frequency current-mode control, ±1.5% output voltage accuracy over temperature, 0.4A–1.2A programmable current limit, thermal shutdown, and 64°C/W junction-to-ambient thermal resistance in the thermally enhanced DFN package.
Technical Context
The LT3663EDCB-3.3#TRPBF implements constant-frequency peak current-mode control with internal slope compensation and a 1.5MHz oscillator. Its bipolar NPN switch features 275mV VCE(SAT) at 1A and is driven via an integrated boost circuit that elevates gate drive above VIN using an internal diode and external 0.1µF capacitor.
It integrates undervoltage lockout (7.5V rising threshold), overvoltage lockout (39V typical), and thermal shutdown. The fixed 3.3V output is achieved via internal resistor divider (FB pin internally tied to 0.8V reference), eliminating external feedback components-unlike adjustable versions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% over –40°C to 125°C - eliminates need for external feedback resistors and ensures stable logic supply rail. |
| Max Output Current | 1.2A continuous - supports high-current 3.3V loads such as microcontrollers, FPGAs, and interface ICs without external current-sense amplifiers. |
| Input Voltage Range | 7.5V to 36V with 60V transient tolerance - enables direct use with unregulated 12V/24V industrial or automotive batteries. |
| Switching Frequency | 1.5MHz typical - allows compact external components (e.g., ≤4.7µH inductors) and reduces output ripple without sacrificing efficiency. |
| Current Limit Range | Programmable 0.4A to 1.2A via ILIM pin resistor - provides precise system-level power dissipation control and protects downstream components during overload. |
| Thermal Resistance θJA | 64°C/W - achieved via exposed GND pad soldered to PCB ground plane; enables 1.2A operation at +85°C ambient with minimal heatsinking. |
| Shutdown Current | ≤2µA - ensures ultra-low quiescent consumption when disabled, critical for always-on automotive modules. |
Pinout & Package
LT3663EDCB-3.3#TRPBF uses an 8-lead (2mm × 3mm) plastic DFN package with exposed GND pad (Pin 9), optimized for low thermal resistance (θJA = 64°C/W). The exposed pad must be soldered to a PCB ground plane with thermal vias for reliable 1.2A operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input power supply connection | Accepts 7.5V–36V; withstands 60V transients; requires local 4.7µF ceramic bypass capacitor. |
| RUN | Enable/shutdown control input | Logic-high ≥2.5V enables regulation; grounded disables device and reduces IQ to ≤2µA. |
| FB | Feedback reference node | Internally connected to 0.8V reference; not accessible - output is fixed at 3.3V, no external resistor divider needed. |
| ILIM | Output current limit programming | Resistor to GND sets average output current limit (e.g., 28.7kΩ = 1.2A); enables system-level power budgeting. |
| SW | Switch node | Drives external inductor; carries high di/dt pulsed current; must be routed short and adjacent to catch diode and input cap. |
| BOOST | Internal switch gate drive booster | Connected to SW via internal diode; requires 0.1µF capacitor to VIN to ensure full NPN saturation and low VCE(SAT). |
| ISENSE | Current sense amplifier positive input | Connects to cathode of internal current-sense resistor; also serves as anode of internal BOOST diode. |
| VOUT | Regulated output terminal | Delivers fixed 3.3V; connects to output capacitor (≥22µF ceramic recommended for low ripple and transient response). |
| GND (exposed pad) | Power and signal ground | Pins 1–8 GND connections plus exposed Pad 9 - all must be soldered to a solid PCB ground plane for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost diode | Eliminates external Schottky diode for gate drive boosting - reduces BOM count and layout area while maintaining 1.5MHz operation. |
| Fixed 3.3V output with internal divider | Removes FB resistor network - simplifies design, improves accuracy (±1.5%), and enhances long-term stability vs. external resistor drift. |
| Programmable output current limit | Enables precise thermal management of power path components (inductor, diode) by limiting average load current from 0.4A to 1.2A. |
| 60V transient protection | Withstands automotive load-dump events without external clamping - OVP triggers at 39V (typ), disabling switching while sustaining input. |
| Thermally enhanced DFN package | 2mm × 3mm footprint with exposed GND pad achieves 64°C/W θJA - supports full 1.2A output at +85°C ambient with standard 2-layer PCB. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Regulating 24V vehicle battery to clean 3.3V for MCU and CAN transceivers in door modules or lighting controllers. IC Role / Device Role / Timing Role: Primary 3.3V buck converter with transient immunity and programmable current limit to prevent fuse blow during short-circuit faults. Use Value: 60V transient tolerance eliminates need for upstream TVS; 1.2A capacity supports multi-peripheral integration; shutdown current <2µA extends battery life in sleep mode. |
Use Scenario: Providing stable 3.3V rail for infotainment SoC core logic and DDR memory interface in head-unit designs. IC Role / Device Role / Timing Role: Fixed-output DC/DC regulator delivering low-noise, tightly regulated 3.3V with fast transient response for digital subsystems. Use Value: Internal compensation and 1.5MHz switching enable small, high-density layout; ±1.5% output accuracy ensures reliable logic-level compliance across temperature. |
| Distributed 3.3V Regulation | Wall Adapter Powered Equipment |
Use Scenario: Local point-of-load conversion from 12V backplane to 3.3V for FPGA I/O banks or sensor signal chains in modular test equipment. IC Role / Device Role / Timing Role: Compact, thermally efficient buck regulator placed near load to minimize IR drop and noise coupling. Use Value: 2mm × 3mm DFN with exposed pad enables direct mounting on heat-spreading copper; programmable current limit prevents board-level thermal runaway. |
Use Scenario: Converting unregulated 12V wall adapter output to 3.3V for embedded networking devices (e.g., PoE injectors, IoT gateways). IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating across wide line variation (±20% AC input ripple reflected as DC variation). Use Value: 7.5V–36V input range accommodates brownout and overvoltage conditions; 1.5MHz frequency minimizes filter size and cost vs. lower-frequency alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3633AEDD-3.3#PBF | 42V max input, 1.5A output, 3MHz sync. buck; requires external feedback resistors; no integrated boost diode. | Better suited for space-constrained designs needing higher frequency and efficiency >90% at light loads due to Burst Mode®. | Select LTC3633A if higher switching frequency (3MHz), synchronous rectification, or ultra-low IQ (<1µA) in shutdown is required - but expect added complexity and cost. |
| TPS54332DR | 28V max input, 3A output, 600kHz adjustable buck; external compensation; no current limit programming; SOIC-8 package. | Higher output current and lower cost, but lacks 60V transient tolerance and programmable current limiting. | Choose TPS54332DR only for non-automotive 24V systems where 3A output and SOIC-8 hand-solderability outweigh missing OVP and ILIM features. |
Compared with LT3663EDCB-3.3#TRPBF, LTC3633AEDD-3.3#PBF offers higher frequency and efficiency at light loads but requires external feedback and lacks integrated boost diode, while TPS54332DR provides higher current and lower cost but omits critical automotive protections and programmable current limiting.
Availability
LT3663EDCB-3.3#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and distributed 3.3V regulation requiring stable component supply, full production traceability, and long-term lifecycle support.
Supply support for LT3663EDCB-3.3#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 its legacy of high-performance analog and power management ICs with rigorous automotive and industrial qualification.
The LT3663 product line was designed specifically for rugged 3.3V/5V point-of-load regulation in harsh environments - emphasizing transient robustness, thermal efficiency, and system-level current limiting for automotive and industrial power architectures.
FAQ
What is the output voltage tolerance of the LT3663EDCB-3.3#TRPBF over temperature?
The LT3663EDCB-3.3#TRPBF guarantees a fixed 3.3V output with ±1.5% accuracy over the full –40°C to 125°C junction temperature range. This specification is ensured by internal trimming of the feedback divider and reference voltage, eliminating drift-related errors common in externally resistor-set regulators. The LT3663EDCB-3.3#TRPBF does not require external calibration or compensation to meet this tolerance.
Can the LT3663EDCB-3.3#TRPBF operate with a 48V input source?
No - the LT3663EDCB-3.3#TRPBF has a maximum continuous input voltage rating of 36V and absolute maximum rating of 60V for non-repetitive 1-second transients. Sustained 48V operation exceeds its safe operating area and risks permanent damage. For 48V systems, consider the LT3663HMS8E-3.3#TRPBF (same functionality, 150°C rated) only if input is clamped below 36V, or select a higher-voltage alternative like the LT3663-5 with external OVP.
Does the LT3663EDCB-3.3#TRPBF require an external boost diode?
No - the LT3663EDCB-3.3#TRPBF integrates the BOOST diode internally between ISENSE and BOOST pins. Only an external 0.1µF ceramic capacitor from BOOST to VIN is required to generate the elevated gate drive voltage. Adding an external Schottky diode is unnecessary and may interfere with internal biasing; the LT3663EDCB-3.3#TRPBF datasheet explicitly confirms this integration in the Pin Functions and Block Diagram sections.
How is output current limiting implemented in the LT3663EDCB-3.3#TRPBF?
The LT3663EDCB-3.3#TRPBF 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 = 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's VC node to reduce duty cycle when the average inductor current exceeds the setpoint. This protects downstream components without requiring external current-sense circuitry - a core feature of the LT3663EDCB-3.3#TRPBF.
What is the thermal performance difference between the DFN and MSOP packages for the LT3663EDCB-3.3#TRPBF?
The LT3663EDCB-3.3#TRPBF uses the 2mm × 3mm DFN (DCB) package with θJA = 64°C/W, whereas the MSOP-8 (MSE) variant has θJA = 35°C/W. However, the LT3663EDCB-3.3#TRPBF part number specifically denotes the DFN package - the MSOP version would be marked LT3663EMS8E-3.3#TRPBF. Thus, thermal design for the LT3663EDCB-3.3#TRPBF must target the 64°C/W value using the exposed pad soldered to a multilayer ground plane with ≥4 thermal vias.
LT3663EDCB-3.3#TRPBF 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):
- 3.3V
- 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)
LT3663EDCB-3.3#TRPBF FAQ
1.How can I place an order for LT3663EDCB-3.3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3663EDCB-3.3#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 LT3663EDCB-3.3#TRPBF reliable?
The price and inventory of LT3663EDCB-3.3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3663EDCB-3.3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3663EDCB-3.3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3663EDCB-3.3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3663EDCB-3.3#TRPBF?
LT3663EDCB-3.3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3663EDCB-3.3#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 LT3663EDCB-3.3#TRPBF?
For technical support, including LT3663EDCB-3.3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3663EDCB-3.3#TRPBF requirements.
6.How does Aetrix verify that LT3663EDCB-3.3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3663EDCB-3.3#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 LT3663EDCB-3.3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3663EDCB-3.3#TRPBF?
All LT3663EDCB-3.3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3663EDCB-3.3#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 LT3663EDCB-3.3#TRPBF part is unused and in its original packaging.
Return procedure for LT3663EDCB-3.3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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