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Analog Devices Inc. LT8301JS5#TRPBF
- Part No.:
- LT8301JS5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT8301JS5#TRPBF.pdf
- Description:
- IC REG FLYBACK 1.2A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,058
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Product details
Overview
LT8301JS5#TRPBF from Analog Devices is a micropower isolated flyback converter IC with integrated 65V/1.2A DMOS switch, operating from 2.7V to 42V input and delivering up to 6W isolated output power. It regulates output voltage via primary-side flyback waveform sampling-eliminating opto-isolators and third windings-and uses a single external resistor (RFB) for VOUT programming in applications like automotive auxiliary supplies and industrial isolated bias rails.
For engineers reviewing the LT8301JS5#TRPBF datasheet, LT8301JS5#TRPBF pinout, LT8301JS5#TRPBF application, or LT8301JS5#TRPBF equivalent, key selection considerations include its –40°C to 150°C junction temperature rating, boundary mode + low-ripple Burst Mode® operation, 100µA sleep-mode quiescent current, and 5-lead TSOT-23 package compatibility with space-constrained isolated DC/DC designs.
Technical Context
The LT8301JS5#TRPBF implements current-mode control with boundary conduction mode (BCM) at heavy loads and transitions to discontinuous conduction mode (DCM) and low-ripple Burst Mode® at light loads. Its flyback pulse sense circuit samples the isolated output voltage directly from the SW pin during zero-secondary-current events, enabling accurate regulation without secondary-side feedback components.
Internal features include 1.0V trimmed reference, 10kΩ internal RREF, soft-start, internal compensation, EN/UVLO with 1.228V threshold and 2.5µA hysteresis current, and output short-circuit protection. The device enforces minimum switch-on time (170ns) and minimum switch-off time (450ns) to ensure stable sampling and prevent leading-edge blanking failure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 42V - supports wide-input industrial, automotive, and telecom supply rails without external pre-regulation. |
| Switch Rating | 65V/1.2A DMOS - enables 5V–24V isolated outputs with ≤36V input while maintaining margin against leakage spikes. |
| Quiescent Current | 100µA in Sleep Mode - sustains ultra-low standby power for always-on isolated monitoring circuits. |
| Regulation Method | Primary-side flyback sampling - eliminates opto-isolator, third winding, and associated aging/drift issues. |
| Operating Modes | Boundary mode (heavy load), DCM (mid-load), low-ripple Burst Mode® (light load) - balances efficiency, EMI, and output ripple across full load range. |
| Junction Temp Range | –40°C to 150°C - qualified per AEC-Q100 for under-hood automotive and high-temp industrial environments. |
| RFB Regulation Current | 100µA ±2.5% - sets precise output voltage via single resistor; enables 5V output with ~154kΩ RFB (typical). |
Pinout & Package
LT8301JS5#TRPBF is housed in a 5-lead plastic TSOT-23 package (S5), with θJA = 150°C/W, optimized for compact isolated flyback layouts and thermal performance in confined spaces.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Undervoltage Lockout Input | Accurate 1.228V threshold with 2.5µA hysteresis current; enables VIN UVLO programming or direct enable control. |
| GND (Pin 2) | Power Ground Reference | Low-impedance return path for internal regulators and feedback circuitry; must connect directly to local ground plane. |
| RFB (Pin 3) | Feedback Resistor Connection | Connects external RFB to SW; forms current-sense path with internal 10kΩ resistor to set VOUT via 100µA regulation current. |
| SW (Pin 4) | Drain of Internal 65V/1.2A DMOS Switch | High dv/dt node requiring minimized trace area; carries primary switching current and reflects isolated output voltage. |
| VIN (Pin 5) | Main Input Supply | Powers internal circuitry and serves as reference for RFB feedback; requires local ceramic bypass capacitor (e.g., 10µF). |
Key Features
| Feature | Design Value |
|---|---|
| No opto-isolator or third winding required | Reduces BOM count, cost, and long-term drift risk while simplifying transformer design and layout. |
| Boundary mode + low-ripple Burst Mode® | Maintains >75% efficiency down to 0.5% load with <50mVpp output ripple-critical for noise-sensitive analog/medical systems. |
| Internal compensation & soft-start | Eliminates external compensation network and startup inrush control components, reducing design cycle time. |
| Output short-circuit protection | Auto-recovery fault handling prevents latch-up during transient overloads-no external current-limiting circuitry needed. |
| AEC-Q100 qualified (Grade J) | Validated for automotive under-hood use with guaranteed operation from –40°C to 150°C junction temperature. |
Applications
| Automotive Auxiliary Power | Industrial Isolated Bias Rail |
|---|---|
|
Use Scenario: Providing isolated 5V/0.5A housekeeping power to CAN transceivers and microcontrollers in engine control units (ECUs). IC Role / Device Role / Timing Role: Primary-side regulated flyback controller generating galvanically isolated output without secondary feedback components. Use Value: Enables compact, AEC-Q100-compliant 5V bias rail with <100µA quiescent draw-meeting automotive cold-crank and low-power standby requirements. |
Use Scenario: Delivering isolated 12V/0.22A auxiliary power to PLC I/O modules operating from 24VDC field bus. IC Role / Device Role / Timing Role: Micropower flyback controller implementing boundary mode for tight load regulation across 0–100% load range. Use Value: Achieves ±3% output regulation without opto-isolator drift, supporting reliable digital I/O isolation in harsh industrial environments. |
| Medical Sensor Isolation | Telecom Remote Power |
|
Use Scenario: Generating isolated 3.3V/0.8A supply for patient-connected biosensor front-ends in portable diagnostic devices. IC Role / Device Role / Timing Role: Safety-certifiable isolated DC/DC controller using primary-side sensing to meet creepage/clearance requirements. Use Value: Eliminates opto-isolator lifetime uncertainty and supports 2×MOPP isolation with certified transformers (e.g., Würth 750313973). |
Use Scenario: Powering remote Ethernet PHYs and PoE interface ICs in telecom access equipment with 48V input. IC Role / Device Role / Timing Role: High-voltage input flyback controller regulating 5V output from 36–57V telecom range using 3:1 transformer. Use Value: Delivers 6W isolated output with 85% peak efficiency at 36V input-reducing thermal load in dense line-card designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3748EMS#TRPBF | Requires external MOSFET; supports up to 100V input; no integrated switch; higher component count. | Better suited for >65V input or >6W output needs where thermal management allows discrete FET placement. | Select when higher input voltage (>42V) or higher output power (>6W) is required; not drop-in compatible. |
| UCC28740DR | TI part with integrated 600V FET; fixed-frequency DCM; no boundary mode; 700mA max switch current. | Targets lower-cost consumer/isolated AC/DC adapters; lacks AEC-Q100 qualification and 150°C rating. | Consider for non-automotive, cost-sensitive designs needing 600V switch rating and simpler transformer design. |
Compared with LT3748EMS#TRPBF and UCC28740DR, the LT8301JS5#TRPBF delivers the highest integration (65V/1.2A switch + regulation + compensation in TSOT-23), widest temperature range, and lowest quiescent current-making it optimal for space- and reliability-constrained isolated DC/DC applications.
Availability
LT8301JS5#TRPBF is available at Aetrix Electronics and suitable for automotive auxiliary power, industrial isolated bias rails, medical sensor isolation, and telecom remote power applications requiring stable component supply, extended temperature operation, and long-term lifecycle continuity.
Supply support for LT8301JS5#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision, industrial, automotive, and communications markets.
The LT8301 product line delivers micropower isolated flyback controllers with primary-side regulation-designed specifically for compact, reliable, and maintenance-free isolated power in automotive, industrial, and medical systems.
FAQ
What is the maximum output power achievable with LT8301JS5#TRPBF?
The LT8301JS5#TRPBF delivers up to 6W of isolated output power, depending on input voltage, transformer turns ratio, and output voltage. At VIN = 36V and 5V output with a 3:1 transformer, typical output is 1.15A (5.75W); at VIN = 5V, it supports 0.4A (2W). Peak efficiency exceeds 85%, and power capability is constrained by the 1.2A minimum switch current limit and 65V SW pin rating.
Does LT8301JS5#TRPBF require an opto-isolator or third winding for regulation?
No, the LT8301JS5#TRPBF does not require an opto-isolator or third winding. It samples the isolated output voltage directly from the primary-side flyback waveform at the SW pin during zero-secondary-current events, enabling accurate regulation using only the main transformer and a single external RFB resistor.
What is the operating temperature range for LT8301JS5#TRPBF?
The LT8301JS5#TRPBF is rated for a junction temperature range of –40°C to 150°C and is AEC-Q100 qualified for automotive applications. This Grade J rating ensures guaranteed performance in under-hood environments and high-temperature industrial settings where standard commercial-grade parts would fail.
How is output voltage programmed on LT8301JS5#TRPBF?
Output voltage is programmed using a single external resistor (RFB) connected between the RFB pin and the SW pin. With a nominal RFB regulation current of 100µA and internal 10kΩ reference, VOUT ≈ 100µA × RFB / NPS – VF, where NPS is the transformer turns ratio and VF is diode forward voltage. For 5V output with 3:1 turns ratio and ~0.3V VF, RFB ≈ 154kΩ.
What protection features are integrated into LT8301JS5#TRPBF?
The LT8301JS5#TRPBF integrates output short-circuit protection with auto-recovery, overtemperature protection that activates above 150°C, and robust EN/UVLO with hysteresis. It also enforces minimum switch-on (170ns) and minimum switch-off (450ns) times to prevent instability and ensure reliable flyback pulse sampling under all load conditions.
LT8301JS5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive or Negative, Isolation Capable
- Topology:
- Flyback
- Output Type:
- -
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- 65V (Switch)
- Current - Output:
- 1.2A (Switch)
- Frequency - Switching:
- Down to 10kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT8301JS5#TRPBF FAQ
1.How can I place an order for LT8301JS5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8301JS5#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 LT8301JS5#TRPBF reliable?
The price and inventory of LT8301JS5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8301JS5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8301JS5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8301JS5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8301JS5#TRPBF?
LT8301JS5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8301JS5#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 LT8301JS5#TRPBF?
For technical support, including LT8301JS5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8301JS5#TRPBF requirements.
6.How does Aetrix verify that LT8301JS5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8301JS5#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 LT8301JS5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8301JS5#TRPBF?
All LT8301JS5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8301JS5#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 LT8301JS5#TRPBF part is unused and in its original packaging.
Return procedure for LT8301JS5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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