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Analog Devices Inc. LT8301ES5#TRMPBF
- Part No.:
- LT8301ES5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT8301ES5#TRMPBF.pdf
- Description:
- IC REG FLYBACK 1.2A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,655
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Product details
Overview
LT8301ES5#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 - ideal for space-constrained auxiliary power in industrial and automotive systems.
For engineers reviewing the LT8301ES5#TRMPBF datasheet, LT8301ES5#TRMPBF pinout, LT8301ES5#TRMPBF application, or LT8301ES5#TRMPBF equivalent, key selection considerations include its 5-lead TSOT-23 package, 100µA sleep-mode quiescent current, 1.2A switch current limit, ±1% RFB regulation current (100µA), and AEC-Q100 qualification for automotive use - all critical for isolated housekeeping supply design.
Technical Context
The LT8301ES5#TRMPBF implements current-mode control with boundary conduction mode (BCM) at heavy loads and transitions to discontinuous conduction mode (DCM) when switching frequency reaches ~430kHz, then enters low-ripple Burst Mode® below ~10kHz to maintain efficiency down to <0.5% full-load. Its flyback pulse sensing circuit samples VOUT during zero-secondary-current events, enabling accurate regulation without secondary-side feedback components.
Internal blocks include a 1.0V trimmed reference, sample-and-hold error amplifier, boundary detector, soft-start, and compensation - all integrated into the 5-lead TSOT-23. The EN/UVLO pin provides programmable undervoltage lockout with 1.228V threshold and 2.5µA hysteresis current, while the RFB pin draws precisely 100µA to set output voltage via VOUT = (100µA × RFB)/NPS − VF.
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 transformer turns ratios up to ~4:1 without exceeding SW pin voltage limits. |
| Quiescent Current | 100µA in Sleep Mode - minimizes standby power loss in always-on auxiliary supplies. |
| RFB Regulation Current | 100µA ±2.5% - sets output voltage accuracy directly; tolerance contributes to ±5% typical board-to-board VOUT variation. |
| Operating Junction Temp | –40°C to +125°C - qualified per AEC-Q100 Grade E, suitable for under-hood and industrial control environments. |
| Switch On-Resistance | 0.4Ω max at 500mA - reduces conduction loss and thermal stress in high-current flyback designs. |
| Minimum Load Requirement | <0.5% of full output - enables stable regulation even with very light or no-load conditions. |
Pinout & Package
LT8301ES5#TRMPBF is housed in a 5-lead plastic TSOT-23 package (S5), with θJA = 150°C/W, optimized for compact isolated DC/DC converters on dense PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Undervoltage Lockout Input | Accurate 1.228V threshold with 2.5µA hysteresis current; used to enable device or program VIN UVLO with resistor divider. |
| GND (Pin 2) | Power Ground Reference | Primary ground return for internal regulators and feedback circuitry; must connect directly to local ground plane. |
| RFB (Pin 3) | Feedback Resistor Terminal | Sinks precise 100µA current; connected to SW via external resistor to set output voltage based on transformer turns ratio. |
| SW (Pin 4) | Switch Drain Node | Drain of integrated 65V/1.2A DMOS; carries high dv/dt flyback pulses - requires minimized trace area and careful layout to suppress EMI. |
| VIN (Pin 5) | Main Power Input | Supplies 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 opto-isolator and third winding - reduces BOM count, cost, and long-term drift issues in isolated supplies. |
| Boundary + Burst Mode | Enables high efficiency (>85%) across full load range: BCM at heavy load, DCM at medium load, low-ripple Burst Mode® at light load. |
| Single-resistor VOUT setting | Output voltage programmed via one external RFB resistor - simplifies design and eliminates trimming potentiometers or DACs. |
| Integrated protection | Includes output short-circuit protection, overtemperature shutdown, and accurate EN/UVLO with hysteresis - enhances system reliability. |
| AEC-Q100 qualified | Rated for automotive applications (Grade E, –40°C to +125°C junction) - validated for harsh environments without derating. |
Applications
| Industrial PLC Auxiliary Supply | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Isolated 5V/0.5A housekeeping rail powering microcontrollers and CAN transceivers in programmable logic controllers. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output without secondary feedback components. Use Value: Reduces component count by eliminating opto-isolator and third winding, improving long-term stability and reducing board area by >30% vs. traditional isolated solutions. |
Use Scenario: 12V-to-5V isolated auxiliary supply for infotainment domain controllers in vehicles with 12V battery input. IC Role / Device Role / Timing Role: Micropower flyback controller with AEC-Q100 qualification ensuring reliable operation across automotive temperature and vibration profiles. Use Value: 100µA sleep-mode IQ enables <1mW standby consumption, meeting OEM requirements for always-on vehicle networks. |
| Medical Sensor Isolation Barrier | Telecom Remote PHY Power |
Use Scenario: 3.3V/0.8A isolated supply for patient-connected biosensors requiring reinforced insulation per IEC 60601-1. IC Role / Device Role / Timing Role: No-opto flyback controller delivering certified creepage/clearance via transformer-only isolation. Use Value: Eliminates opto-isolator aging and nonlinearity - maintains ±5% output regulation over lifetime without recalibration. |
Use Scenario: Compact 24V-to-5V isolated supply powering remote PHY chips in fiber-to-the-home (FTTH) nodes with strict size constraints. IC Role / Device Role / Timing Role: High-integration flyback controller in 5-lead TSOT-23 enabling <100mm² total solution size. Use Value: Boundary mode operation allows use of small 40µH transformers, reducing height to <12mm while maintaining >80% efficiency at 0.4A load. |
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; no integrated switch; supports higher input (up to 100V); includes slope compensation and sync capability. | Better suited for >6W or >42V input designs where thermal management permits discrete FET placement. | Select LT3748EMS#TRPBF only if higher power, wider VIN, or synchronization with system clock is required - not a drop-in replacement. |
| UCC28740DR | TI part with integrated 600V FET; uses different regulation scheme (primary-side sensing with digital control); lower IQ (12µA sleep) but larger SOIC-7 package. | Targets higher-voltage AC/DC adapters (e.g., 85–265VAC) rather than low-VIN DC/DC isolation. | Choose UCC28740DR for universal-input offline applications; LT8301ES5#TRMPBF remains optimal for 2.7–42V DC-fed isolated supplies. |
Compared with LT3748EMS#TRPBF and UCC28740DR, the LT8301ES5#TRMPBF delivers the smallest footprint (TSOT-23), lowest component count (no opto, no third winding, no external FET), and best fit for sub-6W DC-fed isolated auxiliary rails in automotive and industrial settings - without compromising AEC-Q100 compliance or light-load efficiency.
Availability
LT8301ES5#TRMPBF is available at Aetrix Electronics and suitable for industrial PLC auxiliary supplies, automotive body control modules, medical sensor isolation barriers, and telecom remote PHY power requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8301ES5#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8301ES5#TRMPBF belongs to ADI's µModule® and isolated power controller product line, designed specifically to simplify robust, compact, and reliable isolated DC/DC conversion for safety-critical and space-constrained applications.
FAQ
What is the maximum isolated output power achievable with the LT8301ES5#TRMPBF?
The LT8301ES5#TRMPBF delivers up to 6W of isolated output power, depending on input voltage, transformer turns ratio, and output voltage. For example, with VIN = 24V and a 3:1 transformer, it supports 5V/1.0A (5W); with VIN = 36V and optimized 2:1 ratio, peak output reaches ~6W. Power is limited by the 1.2A switch current and 65V SW pin rating - exceeding either violates absolute maximum ratings.
How does the LT8301ES5#TRMPBF regulate output voltage without an opto-isolator?
The LT8301ES5#TRMPBF samples the reflected flyback voltage on the SW pin during zero-secondary-current events in boundary or discontinuous conduction mode. This sampled voltage - proportional to VOUT × NPS + VF - is converted to a precise 100µA current through the RFB pin, enabling regulation using only the primary-side waveform and a single external resistor.
What is the minimum load requirement for stable operation of the LT8301ES5#TRMPBF?
The LT8301ES5#TRMPBF maintains regulation down to less than 0.5% of full output load - e.g., 3mA for a 0.6A-rated 5V supply. This is enabled by low-ripple Burst Mode® operation, which sustains accurate sampling at ~10kHz minimum frequency even under near-no-load conditions.
Can the LT8301ES5#TRMPBF be used in automotive applications?
Yes - the LT8301ES5#TRMPBF is AEC-Q100 qualified (Grade E, –40°C to +125°C junction temperature) and specified for automotive use. Its 100µA sleep-mode IQ, robust EN/UVLO with hysteresis, and integrated short-circuit protection make it suitable for body control modules, infotainment, and ADAS auxiliary supplies.
What transformer parameters are critical when designing with the LT8301ES5#TRMPBF?
Critical transformer parameters include primary inductance (≥25µH typical), leakage inductance (<2µH recommended), turns ratio accuracy (±1%), and saturation current margin (>1.5× peak switch current). Würth, Sumida, and Pulse pre-designed transformers (e.g., 750370047, 12387-T037) are validated for use with LT8301ES5#TRMPBF and listed in the datasheet.
LT8301ES5#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT8301ES5#TRMPBF FAQ
1.How can I place an order for LT8301ES5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8301ES5#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 LT8301ES5#TRMPBF reliable?
The price and inventory of LT8301ES5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8301ES5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8301ES5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8301ES5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8301ES5#TRMPBF?
LT8301ES5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8301ES5#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 LT8301ES5#TRMPBF?
For technical support, including LT8301ES5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8301ES5#TRMPBF requirements.
6.How does Aetrix verify that LT8301ES5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8301ES5#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 LT8301ES5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8301ES5#TRMPBF?
All LT8301ES5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8301ES5#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 LT8301ES5#TRMPBF part is unused and in its original packaging.
Return procedure for LT8301ES5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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