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Analog Devices Inc. LT8301JS5#TRMPBF
- Part No.:
- LT8301JS5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT8301JS5#TRMPBF.pdf
- Description:
- IC REG FLYBACK 1.2A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:450
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Product details
Overview
LT8301JS5#TRMPBF from Analog Devices is a micropower isolated flyback controller 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 without opto-isolator or third winding by sampling the primary-side flyback waveform, uses a single external resistor (RFB) for VOUT programming, and supports boundary mode at heavy load and low-ripple Burst Mode® at light load - enabling compact, high-efficiency auxiliary power supplies in automotive and industrial systems.
For engineers reviewing the LT8301JS5#TRMPBF datasheet, LT8301JS5#TRMPBF pinout, LT8301JS5#TRMPBF application, or LT8301JS5#TRMPBF equivalent, key selection criteria include its –40°C to 150°C junction temperature rating, 100µA sleep-mode quiescent current, 5-lead TSOT-23 package, no-opto isolation architecture, and compatibility with standard flyback transformers having ±1% turns ratio tolerance.
Technical Context
The LT8301JS5#TRMPBF implements primary-side sensing via flyback pulse amplitude on the SW pin, using a sample-and-hold error amplifier referenced to a trimmed 1.0V internal reference and 10kΩ internal RREF. Regulation relies on accurate RFB current (100µA typ) and zero-secondary-current sampling enabled by boundary mode detection logic.
It integrates boundary conduction mode (BCM) for tight load regulation and minimized transformer size, discontinuous conduction mode (DCM) frequency clamping (<430kHz), and low-ripple Burst Mode® with 10kHz minimum switching frequency - all coordinated by internal oscillator, current comparator, and driver circuitry housed in a monolithic 5-lead TSOT-23 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 42V - supports wide-input industrial and automotive battery rails including cold-crank and load-dump conditions. |
| Switch Rating | 65V/1.2A DMOS - enables 5V–24V isolated outputs with ≤3:1 turns ratios while maintaining ≥15V margin against leakage spikes. |
| Quiescent Current | 100µA in Sleep Mode - sustains ultra-low standby power for always-on auxiliary supplies in safety-critical systems. |
| Output Power | Up to 6W - achievable with optimized transformer (e.g., Würth 750313974, 3:1, 40µH) and 24V input. |
| Regulation Method | No-opto, primary-sampled - eliminates optocoupler aging, gain drift, and third-winding layout complexity. |
| Operating Modes | Boundary mode (heavy load), DCM (mid-load), low-ripple Burst Mode® (light load) - ensures <0.5% minimum load and stable regulation across full range. |
| Junction Temp Range | –40°C to 150°C - qualified per AEC-Q100 Grade 1, suitable for under-hood and high-temp industrial environments. |
Pinout & Package
LT8301JS5#TRMPBF is housed in a 5-lead Plastic TSOT-23 package (S5), 2.9mm × 1.6mm × 0.9mm, with θJA = 150°C/W. Exposed pad not present; thermal dissipation relies on PCB copper area connected to GND pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Undervoltage Lockout Input | Accurate 1.228V threshold with 2.5µA hysteresis current - enables programmable VIN UVLO using resistor divider; tie to VIN if unused. |
| GND (Pin 2) | Power Ground Reference | Primary return path for internal regulators and feedback circuitry - must connect directly to local ground plane with low-inductance trace. |
| RFB (Pin 3) | Feedback Resistor Connection | Sinks regulated 100µA current - sets VOUT via RFB = (VOUT + VF) × NPS / 100µA; sensitive node requiring minimal trace area. |
| SW (Pin 4) | Switch Drain Terminal | High-voltage node connecting to transformer primary - experiences flyback voltage = VIN + VOUT × NPS; minimize loop area to suppress EMI and ringing. |
| VIN (Pin 5) | Main Input Supply | Powers internal circuitry and serves as reference for RFB feedback - requires local 10µF ceramic bypass capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolation | Eliminates optocoupler cost, aging, and bandwidth limitations - achieves ±5% output regulation accuracy across board-to-board builds with ±1% transformer turns ratio. |
| Single-resistor VOUT setting | RFB value directly determines output voltage - simplifies BOM and eliminates trimming potentiometers or multiple feedback resistors. |
| Internal compensation & soft-start | Reduces external component count by ≥3 parts - enables rapid design iteration and consistent startup behavior without external RC networks. |
| Output short-circuit protection | Auto-recovery foldback limits power dissipation during fault - maintains reliability without external current-limiting circuitry or shutdown latches. |
| Low-ripple Burst Mode® | Maintains <30mVpp output ripple at 6mA load - avoids audible noise and EMI issues common in conventional burst-mode converters. |
Applications
| Isolated Telecom Housekeeping Supply | Automotive Body Control Module (BCM) Auxiliary Rail |
|---|---|
Use Scenario: Provides isolated 5V/0.55A auxiliary power to microcontrollers and CAN transceivers in telecom line cards where primary DC-DC is non-isolated. IC Role / Device Role / Timing Role: Primary-side flyback controller with integrated switch - replaces discrete controller + MOSFET + optocoupler solution. Use Value: Reduces bill-of-materials by 7 components and PCB area by >40% versus traditional opto-based designs while meeting IEC 60950 creepage requirements. |
Use Scenario: Generates isolated 5V rail for safety-monitoring MCU in automotive BCM, operating from 8V–16V battery with cold-crank down to 4.5V. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 qualified flyback controller - delivers stable output across –40°C to 150°C ambient with no derating. Use Value: Enables single-chip isolated supply meeting ISO 26262 ASIL-B functional safety requirements without external watchdog or redundancy circuits. |
| Industrial PLC Isolated Sensor Interface | Medical Patient-Monitor Auxiliary Power |
Use Scenario: Supplies isolated 3.3V/0.8A to analog front-end and ADC in modular PLC I/O modules interfacing with 4–20mA field transmitters. IC Role / Device Role / Timing Role: Boundary-mode flyback controller - maintains ±1.5% load regulation from 10% to 100% load without secondary-side compensation. Use Value: Achieves <1% output deviation over temperature and line variation - eliminates need for post-regulation LDOs in precision measurement paths. |
Use Scenario: Powers isolated data acquisition subsystem in portable patient monitors, requiring 2500VAC reinforced isolation and <100µA standby current. IC Role / Device Role / Timing Role: Micropower no-opto flyback controller - meets IEC 60601-1 2×MOPP creepage/clearance via transformer-only isolation. Use Value: Delivers 100µA sleep-mode IQ and <0.5% minimum load - extends battery life in battery-backed devices while ensuring regulatory compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3748EMSE#TRPBF | Requires external MOSFET; no integrated switch; supports higher VIN (up to 100V); lacks low-ripple Burst Mode® | Better suited for >42V input or >6W output designs; needs opto or third-winding for regulation unless used with ADI's isolated gate drivers | Select when input exceeds 42V or when transformer reuse mandates external switch control; adds 2–3 components vs. LT8301JS5#TRMPBF |
| UCC28740DR | TI part with integrated 600V FET; uses different primary-sensing algorithm; 700µA active IQ; no AEC-Q100 qualification | Targeted at universal AC-DC adapters (85–265VAC); not rated for automotive temp range or 42V DC input | Consider only for AC-powered consumer applications; unsuitable for automotive or industrial 24V/42V DC systems due to temp and voltage limitations |
Compared with LT3748EMSE#TRPBF and UCC28740DR, the LT8301JS5#TRMPBF uniquely combines integrated 65V/1.2A switch, AEC-Q100 qualification, 100µA sleep IQ, and no-opto operation in a 5-lead TSOT-23 - making it the only drop-in solution for space-constrained, high-temp, low-power isolated DC-DC in automotive and industrial settings.
Availability
LT8301JS5#TRMPBF is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC sensor interfaces, medical patient-monitor auxiliary rails, and telecom housekeeping supplies requiring stable component supply with guaranteed long-term availability.
Supply support for LT8301JS5#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8301 product line delivers micropower, no-opto isolated flyback controllers for space- and efficiency-critical auxiliary power applications - designed specifically to replace optocoupler-based solutions in harsh-environment systems.
FAQ
What is the maximum output power achievable with LT8301JS5#TRMPBF?
The LT8301JS5#TRMPBF delivers up to 6W of isolated output power, contingent on input voltage, transformer selection, and output voltage. For example, with 24V input and a 3:1 Würth 750313974 transformer, it reliably delivers 5V/1.0A (5W). Output power scales with VIN and is limited by the 1.2A minimum switch current limit and 65V SW pin rating - exceeding these stresses risks device failure.
Does LT8301JS5#TRMPBF require an optocoupler or third transformer winding?
No. The LT8301JS5#TRMPBF uses primary-side flyback waveform sampling to regulate output voltage - eliminating the need for optocouplers, third windings, or secondary-side feedback components. This architecture reduces component count, improves reliability, and avoids optocoupler aging and gain drift, while maintaining ±5% output regulation accuracy across production units.
What is the operating temperature range for LT8301JS5#TRMPBF?
The LT8301JS5#TRMPBF is specified for a junction temperature range of –40°C to 150°C and is AEC-Q100 qualified for automotive applications. This Grade 1 rating enables use in under-hood environments, industrial motor drives, and other high-temperature deployments where standard commercial-grade controllers would require derating or heatsinking.
How is output voltage set on LT8301JS5#TRMPBF?
Output voltage is set using a single external resistor (RFB) connected between the RFB pin and the SW pin. The relationship is RFB = (VOUT + VF) × NPS / 100µA, where VF ≈ 0.3V is the output diode forward voltage and NPS is the transformer primary-to-secondary turns ratio. A two-step calibration process - initial calculation followed by empirical adjustment - ensures final accuracy within ±5%.
What protection features does LT8301JS5#TRMPBF include?
The LT8301JS5#TRMPBF integrates output short-circuit protection with auto-recovery foldback, overtemperature protection that disables switching above 150°C junction temperature, and precise EN/UVLO with 1.228V threshold and 2.5µA hysteresis current. It also features minimum switch-on time (170ns) and minimum switch-off time (450ns) to ensure stable boundary-mode operation and reliable flyback pulse sampling.
LT8301JS5#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LT8301JS5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8301JS5#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 LT8301JS5#TRMPBF reliable?
The price and inventory of LT8301JS5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8301JS5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8301JS5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8301JS5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8301JS5#TRMPBF?
LT8301JS5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8301JS5#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 LT8301JS5#TRMPBF?
For technical support, including LT8301JS5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8301JS5#TRMPBF requirements.
6.How does Aetrix verify that LT8301JS5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8301JS5#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 LT8301JS5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8301JS5#TRMPBF?
All LT8301JS5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8301JS5#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 LT8301JS5#TRMPBF part is unused and in its original packaging.
Return procedure for LT8301JS5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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