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Analog Devices Inc. LT8301HS5#TRMPBF
- Part No.:
- LT8301HS5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT8301HS5#TRMPBF.pdf
- Description:
- IC REG FLYBACK 1.2A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,820
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Product details
Overview
LT8301HS5#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 via primary-side flyback waveform sampling-eliminating opto-isolators and third windings-and uses a single external resistor (RFB) for VOUT programming. Designed for automotive-grade reliability, it supports –40°C to 150°C junction temperature and features boundary mode + low-ripple Burst Mode® operation.
For engineers reviewing the LT8301HS5#TRMPBF datasheet, LT8301HS5#TRMPBF pinout, LT8301HS5#TRMPBF application, or LT8301HS5#TRMPBF equivalent, key selection considerations include its 100µA sleep-mode quiescent current, 65V SW pin rating, 5-lead TSOT-23 package, AEC-Q100 qualification, and transformer turns-ratio–dependent output accuracy in isolated auxiliary power supplies.
Technical Context
The LT8301HS5#TRMPBF implements primary-side regulation using a sample-and-hold error amplifier that captures the reflected flyback pulse at zero secondary current-enabling precise output sensing without optocouplers or auxiliary windings. Its boundary conduction mode (BCM) ensures tight load regulation by resetting secondary current each cycle, while low-ripple Burst Mode® maintains ≥75% efficiency down to 0.5% full-load with <15mVpp output ripple.
Internally, the device integrates a 1.2A/65V DMOS switch, 10kΩ internal RREF, 1.0V trimmed reference, and programmable EN/UVLO with 1.228V threshold and 2.5µA hysteresis current. The 170ns minimum on-time and 450ns minimum off-time enforce stable sampling windows, requiring transformer primary inductance ≥2.7µH (for VIN=36V, NPS=3:1) to avoid leading-edge blanking loss.
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 (6V) and load-dump (42V) conditions. |
| Integrated Switch | 65V/1.2A DMOS - enables direct interface with 48V systems and eliminates external high-voltage MOSFETs. |
| Quiescent Current | 100µA in Sleep Mode - extends battery life in always-on isolated housekeeping supplies. |
| Output Power | Up to 6W - sufficient for isolated gate drivers, sensor bias, and microcontroller auxiliary rails. |
| Junction Temp Range | –40°C to 150°C - qualified per AEC-Q100 Grade H for under-hood automotive applications. |
| Regulation Method | Primary-side flyback sampling - removes opto-isolator cost, aging drift, and bandwidth limitations. |
| Switching Modes | Boundary Mode (heavy load), Discontinuous Mode (mid-load), Low-Ripple Burst Mode® (light load) - balances efficiency, EMI, and transient response across full load range. |
Pinout & Package
LT8301HS5#TRMPBF is housed in a 5-lead ThinSOT™ (TSOT-23) package with 0.95mm pitch, 2.9mm × 1.6mm footprint, and θJA = 150°C/W. Exposed pad is not present; GND pin provides thermal path via PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Input Undervoltage Lockout Input | 1.228V threshold with 2.5µA hysteresis current - allows precise VIN UVLO programming via resistor divider; tie to VIN if unused. |
| GND (Pin 2) | Power Ground Reference | 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 | Connects external RFB to SW; internal 10kΩ sets VOUT = 100µA × RFB / NPS − VF - defines output voltage with transformer turns ratio dependency. |
| SW (Pin 4) | Drain of Integrated 65V/1.2A DMOS Switch | High-slew-rate node carrying primary current and flyback voltage - minimize trace area to reduce EMI and leakage-induced voltage spikes. |
| VIN (Pin 5) | Main Input Supply and Reference | Supplies internal circuitry and serves as reference for RFB feedback - requires local 10µF ceramic bypass to GND. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolation | Eliminates optocoupler and third winding - reduces BOM count by ≥3 components and avoids opto aging/nonlinearity. |
| Single-resistor VOUT set | RFB value directly determines output voltage (e.g., 154kΩ → 5V @ 3:1 turns ratio) - simplifies design iteration and field calibration. |
| Low-ripple Burst Mode® | Maintains <15mVpp output ripple at light loads while sustaining >75% efficiency - critical for noise-sensitive analog/mixed-signal circuits. |
| Internal compensation & soft-start | Removes external compensation network and startup inrush control - reduces layout sensitivity and accelerates time-to-test. |
| Output short-circuit protection | Auto-recovery foldback limits power dissipation during fault - prevents thermal runaway without external current sense. |
| AEC-Q100 Grade H | Qualified for –40°C to 150°C operation - meets automotive under-hood temperature requirements without derating. |
Applications
| Automotive Auxiliary Power | Industrial Isolated Sensors |
|---|---|
Use Scenario: Providing isolated 5V/0.5A bias for CAN transceivers and isolated ADCs in engine control units (ECUs). IC Role / Device Role / Timing Role: Primary-side flyback controller generating regulated isolated output from 12V/24V vehicle battery with no optocoupler. Use Value: Enables compact, AEC-Q100-compliant auxiliary rail meeting ISO 16750-2 load-dump immunity and extended temperature operation. |
Use Scenario: Powering isolated current/voltage sensors in motor drives where primary-side ground noise exceeds 1kV/ms dv/dt. IC Role / Device Role / Timing Role: Isolated flyback controller delivering clean 3.3V/0.8A to secondary-side signal conditioning circuitry. Use Value: Achieves >3kV reinforced isolation barrier without opto delay or gain drift, supporting IEC 61800-5-1 functional safety compliance. |
| Medical Patient Monitoring | Telecom Housekeeping Supply |
Use Scenario: Generating isolated 5V/0.4A for microcontroller and analog front-end in portable ECG monitors. IC Role / Device Role / Timing Role: Micropower isolated flyback controller powering safety-critical patient-connected circuitry with galvanic separation. Use Value: Meets IEC 60601-1 2× MOPP creepage/clearance requirements while maintaining <100µA standby draw for 7-day battery life. |
Use Scenario: Delivering isolated 12V/0.22A auxiliary supply for FPGA configuration and management in 48V telecom rectifiers. IC Role / Device Role / Timing Role: High-voltage input flyback controller regulating isolated output from 36–75V telecom DC bus. Use Value: Supports hot-swap operation and 42V transient tolerance while enabling compact board area via 5-pin TSOT-23 packaging. |
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 optocoupler feedback; higher IQ (1.1mA active); 60V/3.3A switch; MSOP-10 package | Supports higher output power (up to 15W); suited for designs needing tighter regulation over line/load/temp | Select when optocoupler-based regulation is acceptable and >6W output or lower output ripple is required. |
| UCC28911DR | No optocoupler; 700V integrated MOSFET; 100kHz fixed frequency; SOIC-7 package; no AEC-Q100 grade | Targets universal AC input (85–265VAC); unsuitable for 42V max DC input or automotive temp range | Select for AC/DC offline flyback; avoid for automotive or low-IQ DC/DC isolated supplies. |
Compared with LT3748EMS#TRPBF and UCC28911DR, the LT8301HS5#TRMPBF uniquely combines no-opto operation, ultra-low quiescent current, AEC-Q100 qualification, and 5-lead TSOT-23 packaging-making it optimal for space-constrained, battery-backed, or automotive-grade isolated auxiliary rails under 6W.
Availability
LT8301HS5#TRMPBF is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, medical patient monitors, and telecom housekeeping supplies requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT8301HS5#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 precision instrumentation, industrial automation, automotive, and communications markets.
The LT8301 family is part of Analog Devices' Power by Linear™ isolated DC/DC controller portfolio, designed specifically for compact, low-component-count, optocoupler-free isolated power conversion in space- and power-constrained applications.
FAQ
What is the maximum input voltage rating for the LT8301HS5#TRMPBF?
The LT8301HS5#TRMPBF has an absolute maximum input voltage rating of 42V on the VIN pin. Operation above this level risks permanent damage. The internal 65V DMOS switch allows reflected flyback voltages up to 65V on the SW pin, but total SW voltage (VIN + VOUT × NPS + leakage spike) must remain below 65V. Derating is recommended for reliability in automotive transients.
How does the LT8301HS5#TRMPBF achieve regulation without an optocoupler?
The LT8301HS5#TRMPBF samples the isolated output voltage directly from the primary-side flyback waveform at the SW pin when secondary current reaches zero. This sampled voltage is converted to a current (IRFB), compared against a 1.0V internal reference, and used to adjust switching timing-enabling precise regulation without optocouplers, third windings, or secondary-side feedback components.
What is the purpose of the RFB pin on the LT8301HS5#TRMPBF?
The RFB pin on the LT8301HS5#TRMPBF connects to the SW node through an external resistor (RFB) and forms the primary feedback path. The device regulates output voltage using the relationship VOUT ≈ (100µA × RFB)/NPS − VF, where NPS is the transformer turns ratio and VF is the output diode forward voltage. RFB value directly sets output voltage for a given transformer.
Does the LT8301HS5#TRMPBF support AEC-Q100 qualification?
Yes, the LT8301HS5#TRMPBF is AEC-Q100 qualified for Grade H (–40°C to +150°C junction temperature), making it suitable for automotive under-hood applications. This qualification covers stress testing for temperature cycling, humidity, ESD, and lifetime reliability-verified per Automotive Electronics Council standards.
What are the minimum and maximum switching frequencies of the LT8301HS5#TRMPBF?
The LT8301HS5#TRMPBF operates with a typical minimum switching frequency of 9.4kHz in Burst Mode® and a maximum of 430kHz in discontinuous conduction mode. Boundary mode frequency varies with load and input voltage-e.g., ~100kHz at full load with VIN=12V-and is automatically adjusted to maintain zero-current switching and optimal efficiency.
LT8301HS5#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):
- -
- Current - Output:
- 1.2A
- Frequency - Switching:
- Down to 10kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT8301HS5#TRMPBF FAQ
1.How can I place an order for LT8301HS5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8301HS5#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 LT8301HS5#TRMPBF reliable?
The price and inventory of LT8301HS5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8301HS5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8301HS5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8301HS5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8301HS5#TRMPBF?
LT8301HS5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8301HS5#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 LT8301HS5#TRMPBF?
For technical support, including LT8301HS5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8301HS5#TRMPBF requirements.
6.How does Aetrix verify that LT8301HS5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8301HS5#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 LT8301HS5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8301HS5#TRMPBF?
All LT8301HS5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8301HS5#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 LT8301HS5#TRMPBF part is unused and in its original packaging.
Return procedure for LT8301HS5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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