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Analog Devices Inc. LT1424IS8-5#TRPBF
- Part No.:
- LT1424IS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1424IS8-5#TRPBF.pdf
- Description:
- IC REG FLYBACK 5V 400MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
LT1424IS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic isolated flyback switching regulator IC designed for primary-side sensing of 5V isolated outputs without optoisolators or third-winding feedback. It integrates a 1.6A current-limited 35V switch, 285kHz oscillator, load-compensated feedback amplifier, and shutdown control. Delivers up to 400mA at 5V using 1:1 transformers in industrial power supplies.
For engineers reviewing the LT1424IS8-5#TRPBF datasheet, LT1424IS8-5#TRPBF pinout, LT1424IS8-5#TRPBF application, or LT1424IS8-5#TRPBF equivalent, key selection criteria include primary-side regulation capability, 285kHz fixed-frequency operation, 7mA quiescent current, –40°C to 125°C industrial temperature rating, and SO-8 package compatibility with board-level isolation requirements.
Technical Context
The LT1424IS8-5#TRPBF implements current-mode control with a proprietary flyback error amplifier that samples the primary-side flyback pulse to infer secondary output voltage-eliminating optoisolators and auxiliary windings. Its collapse-detect timing logic enables stable regulation down to discontinuous conduction mode.
It features integrated load compensation via RCCOMP pin to counteract output impedance errors from diode drop and transformer ESR, and includes a 20µA shutdown mode, 1.9V VC clamp for peak-current limiting, and SYNC input supporting 330–450kHz external synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V nominal; regulated via primary-side flyback pulse sampling-no secondary feedback components required. |
| Switching Frequency | 285kHz typical; enables compact magnetics and predictable EMI profile without requiring frequency-setting components. |
| Max Output Current | 400mA at 5V; achieved with internal 1.6A switch and optimized thermal design in SO-8 package. |
| Input Voltage Range | 3V to 20V; supports wide-input industrial rails with 2.8V undervoltage lockout protection. |
| Quiescent Current | 7mA typical; enables low-power standby operation without external bias winding. |
| Shutdown Current | 20µA typical; reduces system idle power for energy-sensitive applications. |
| Operating Temperature | –40°C to +125°C junction; qualified for industrial automation and instrumentation environments. |
Pinout & Package
LT1424IS8-5#TRPBF is housed in an 8-pin SOIC (SO-8) package with exposed pad for thermal enhancement. Pin 1 is SHDN; Pin 5 is PGND (power ground); Pin 6 is VSW (switch collector); Pin 7 is VIN; Pin 8 is RCCOMP (load compensation capacitor connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Shutdown control input | Logic-high (>0.9V) disables switching and reduces supply current to 20µA; floating = active. |
| VC (Pin 2) | Feedback amplifier output / current comparator input | Integrates loop compensation; clamped at 1.9V to set peak switch current limit. |
| SYNC (Pin 3) | External oscillator synchronization input | Accepts 10–90% duty-cycle square wave; extends frequency range to 330–450kHz for EMI reduction. |
| SGND (Pin 4) | Signal ground reference | Provides clean reference for internal bandgap and feedback amplifier; must be isolated from PGND noise paths. |
| PGND (Pin 5) | Power ground return | Emitter node of internal NPN switch; carries high pulsed currents-requires direct low-inductance connection to ground plane. |
| VSW (Pin 6) | Switch collector node | Connects to transformer primary; handles high dv/dt and pulsed currents-trace routing critical for EMI control. |
| VIN (Pin 7) | Main supply input | 3–20V input with 2.8V UVLO; requires ≥10µF local bypass capacitance. |
| RCCOMP (Pin 8) | Load compensation filter terminal | Connects to 0.1µF ceramic capacitor to enable dynamic correction of output voltage droop under load variation. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side output sensing | Eliminates optoisolator and third-winding-reduces BOM count, cost, and PCB area while improving reliability over temperature and lifetime. |
| Discontinuous mode regulation | Maintains ±2.5% output regulation down to ~1–2mA load via collapse-detect timing, enabling ultra-low-power standby states. |
| Integrated load compensation | Corrects for Schottky diode VF and transformer secondary ESR effects using external RCCOMP capacitor-improves load regulation to <±1% across 0–400mA. |
| 285kHz fixed-frequency operation | Enables consistent EMI filtering and predictable transformer design without external timing components or trimming. |
| Industrial temperature grade | Rated for –40°C to +125°C operation-validated for use in programmable logic controllers, sensor transmitters, and factory-floor equipment. |
Applications
| Industrial PLC Power Rails | Isolated Sensor Interface Supplies |
|---|---|
Use Scenario: Providing galvanically isolated 5V power to analog input modules in programmable logic controllers where field-side and controller-side grounds are separated. IC Role / Device Role / Timing Role: Primary-side flyback controller generating regulated 5V output without secondary feedback components-enabling compact, high-density module designs. Use Value: Reduces component count by eliminating optoisolators and auxiliary windings, lowering assembly cost and improving long-term stability versus aging optocouplers. | Use Scenario: Powering isolated signal-conditioning circuitry (e.g., instrumentation amplifiers, ADC drivers) in pressure/temperature transmitters deployed in hazardous locations. IC Role / Device Role / Timing Role: Isolated 5V DC-DC converter with <2mA minimum load capability-supports low-power sleep modes while maintaining regulation during wake-up transitions. Use Value: Enables reliable start-up and regulation at light loads via collapse-detect timing, avoiding output voltage overshoot during sensor acquisition bursts. |
| Medical Patient Monitoring Isolation | Industrial Ethernet Node Power |
Use Scenario: Supplying isolated 5V power to ECG front-end circuits where patient-connected sections require reinforced insulation per IEC 60601-1. IC Role / Device Role / Timing Role: Flyback controller operating with certified 1:1 safety transformers-providing creepage/clearance-compliant isolation without optocoupler CTR degradation concerns. Use Value: Eliminates optoisolator nonlinearities and unit-to-unit variation-ensuring consistent accuracy across production batches and over 10+ year service life. | Use Scenario: Generating isolated 5V for PHY and MAC interfaces in DIN-rail mounted industrial Ethernet switches operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Fixed-frequency 285kHz flyback controller with SYNC input-allowing clock alignment to system master clock to suppress beat-frequency EMI in multi-port systems. Use Value: Synchronization capability reduces conducted emissions in dense network infrastructure, easing EMC certification without added shielding or filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28711DR | PSR controller with variable-frequency quasi-resonant operation; no SYNC input; 500mW–5W range; requires external MOSFET. | Targets lower-power adapters (<5W); lacks integrated switch and load compensation; less suitable for fixed 400mA industrial loads. | Select UCC28711DR only when designing sub-2W isolated supplies with strict efficiency targets and no need for 5V precision or load compensation. |
| LT3748EMSE#TRPBF | PSR flyback controller with integrated 1.5A/75V switch; supports adjustable output; includes soft-start and fault reporting; SO-10 package. | Broader output flexibility (adjustable via resistor divider); higher voltage rating; larger footprint-less drop-in for space-constrained SO-8 layouts. | Choose LT3748EMSE#TRPBF when output voltage adjustability, enhanced protection features, or >20V input capability are required-accepting SO-10 re-layout. |
Compared with UCC28711DR and LT3748EMSE#TRPBF, the LT1424IS8-5#TRPBF offers unique integration of fixed 5V regulation, load compensation, and SYNC capability in an SO-8 footprint-making it optimal for cost-sensitive, high-volume industrial 5V isolated supplies where layout reuse and minimal BOM are critical.
Availability
LT1424IS8-5#TRPBF is available at Aetrix Electronics and suitable for industrial automation, isolated sensor interfaces, and medical monitoring equipment requiring stable component supply and long-term manufacturability.
Supply support for LT1424IS8-5#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT1424IS8-5#TRPBF belongs to ADI's legacy Linear Technology isolated power controller family, engineered specifically for compact, reliable, optocoupler-free 5V isolated flyback supplies in harsh industrial and instrumentation environments.
FAQ
What is the maximum continuous output current supported by the LT1424IS8-5#TRPBF?
The LT1424IS8-5#TRPBF delivers up to 400mA at 5V under typical conditions using a properly rated 1:1 transformer and external components. This is enabled by its integrated 1.6A current-limited switch and thermal design in the SO-8 package. Derating is required above 85°C ambient or with poor PCB copper area; full 400mA assumes 20V input, 25°C case temperature, and adequate heatsinking via the exposed pad.
Does the LT1424IS8-5#TRPBF require an optoisolator or third-winding feedback?
No, the LT1424IS8-5#TRPBF does not require an optoisolator or third-winding feedback. It achieves isolated output regulation by directly sensing the primary-side flyback pulse waveform-enabling simplified, lower-cost, and more reliable designs. This core functionality is intrinsic to the LT1424IS8-5#TRPBF architecture and is validated across its full industrial temperature range.
How does the load compensation feature of the LT1424IS8-5#TRPBF improve regulation?
The LT1424IS8-5#TRPBF uses its RCCOMP pin to connect an external 0.1µF capacitor, enabling dynamic correction of output voltage droop caused by Schottky diode forward voltage and transformer secondary ESR. This load compensation reduces load regulation error from >±5% to <±1% across 0–400mA, ensuring stable 5V operation in precision industrial sensors and data acquisition systems powered by the LT1424IS8-5#TRPBF.
Can the LT1424IS8-5#TRPBF operate at light loads or in discontinuous conduction mode?
Yes, the LT1424IS8-5#TRPBF maintains regulation well into discontinuous conduction mode (DCM) down to ~1–2mA output current, thanks to its collapse-detect timing circuitry and minimum flyback enable time optimization. This capability is explicitly characterized and guaranteed-making the LT1424IS8-5#TRPBF suitable for battery-backed or low-power standby applications where the LT1424IS8-5#TRPBF must sustain regulation during infrequent wake-up events.
What is the purpose of the SYNC pin on the LT1424IS8-5#TRPBF?
The SYNC pin on the LT1424IS8-5#TRPBF allows external synchronization of its internal 285kHz oscillator to a system master clock, extending the operational range to 330–450kHz. This feature reduces beat-frequency EMI in multi-converter systems and enables coordinated switching in industrial Ethernet nodes-directly enhancing EMC performance without modifying the LT1424IS8-5#TRPBF's core regulation behavior.
LT1424IS8-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive or Negative, Isolation Capable
- Topology:
- Flyback
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.8V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 400mA
- Frequency - Switching:
- 285kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1424IS8-5#TRPBF FAQ
1.How can I place an order for LT1424IS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1424IS8-5#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 LT1424IS8-5#TRPBF reliable?
The price and inventory of LT1424IS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1424IS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1424IS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1424IS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1424IS8-5#TRPBF?
LT1424IS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1424IS8-5#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 LT1424IS8-5#TRPBF?
For technical support, including LT1424IS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1424IS8-5#TRPBF requirements.
6.How does Aetrix verify that LT1424IS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1424IS8-5#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 LT1424IS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1424IS8-5#TRPBF?
All LT1424IS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1424IS8-5#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 LT1424IS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1424IS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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