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Analog Devices Inc. LT8301IS5#TRPBF
- Part No.:
- LT8301IS5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT8301IS5#TRPBF.pdf
- Description:
- IC REG FLYBACK 1.2A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,060
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Product details
Overview
LT8301IS5#TRPBF 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 LT8301IS5#TRPBF datasheet, LT8301IS5#TRPBF pinout, LT8301IS5#TRPBF application, or LT8301IS5#TRPBF equivalent, key selection considerations include its 5-lead TSOT-23 package, –40°C to 125°C operating junction temperature, 100µA sleep-mode quiescent current, internal compensation, and no-opto isolation architecture enabling compact, high-reliability isolated DC/DC designs.
Technical Context
The LT8301IS5#TRPBF implements current-mode control with boundary conduction mode (BCM) at heavy loads and discontinuous conduction mode (DCM) with frequency clamping below 430kHz at lighter loads. Its flyback pulse sense circuit and sample-and-hold error amplifier directly regulate isolated output voltage using only the SW pin's reflected waveform - eliminating opto-isolators and third windings.
It integrates a 65V/1.2A DMOS switch, EN/UVLO with 1.228V enable threshold and 2.5µA hysteresis current, internal soft-start, output short-circuit protection, and RFB regulation current trimmed to 100µA ±2.5%. The device operates across –40°C to 125°C and is AEC-Q100 qualified for automotive use.
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 drain-source breakdown, 1.2A peak current limit - enables safe operation with ≤50V reflected flyback voltage plus margin for leakage spikes. |
| Quiescent Current | 100µA in sleep mode - minimizes standby power loss in always-on isolated housekeeping supplies. |
| RFB Regulation Current | 100µA ±2.5% - sets output voltage accuracy via external resistor; enables precise VOUT programming with <±5% board-to-board variation. |
| Operating Temperature | –40°C to 125°C junction - qualified per AEC-Q100 Grade I, suitable for under-hood and industrial control environments. |
| Package | 5-lead TSOT-23 - ultra-compact footprint (2.9mm × 1.6mm) with θJA = 150°C/W, optimized for high-density PCB layouts. |
| Control Modes | Boundary mode (heavy load), DCM (mid-load), low-ripple Burst Mode® (light load) - maintains >75% efficiency from 6mA to full load across input range. |
Pinout & Package
LT8301IS5#TRPBF is housed in a 5-lead plastic TSOT-23 package (2.9mm × 1.6mm × 0.9mm), thermally enhanced with exposed pad (not electrically connected), θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Undervoltage Lockout Input | Accurate 1.228V enable threshold with 2.5µA hysteresis current; enables programmable VIN UVLO using resistor divider or direct tie to VIN. |
| GND (Pin 2) | Power Ground Reference | Primary return path for internal regulators and feedback circuitry; must connect directly to local ground plane for noise immunity. |
| RFB (Pin 3) | Feedback Resistor Connection | Connects external resistor to SW pin; 100µA current flows through RFB to set VOUT = (100µA × RFB)/NPS − VF - no opto or third winding required. |
| SW (Pin 4) | Switch Drain Node | Drain of integrated 65V/1.2A DMOS switch; carries high dv/dt flyback pulses - minimize trace area and loop inductance to suppress EMI and voltage overshoot. |
| VIN (Pin 5) | Main Power Input | Supplies internal bias circuitry and serves as reference for RFB feedback; requires local 10µF ceramic bypass capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolated regulation | Eliminates opto-isolator and third transformer winding - reduces BOM count, cost, and long-term drift while improving reliability in automotive/industrial applications. |
| Single-resistor VOUT programming | RFB value directly determines output voltage (e.g., 154kΩ sets 5V with 3:1 turns ratio); enables rapid design iteration without component changes. |
| Low-ripple Burst Mode® | Maintains <30mVpp output ripple at light load while achieving >75% efficiency down to 6mA - critical for noise-sensitive analog and sensor circuits. |
| Internal compensation & soft-start | Removes need for external compensation network and startup timing components - simplifies layout and ensures monotonic start-up into capacitive loads. |
| Output short-circuit protection | Auto-recovery foldback limits power dissipation during sustained short - prevents thermal runaway without external current-sense resistors or shutdown latching. |
Applications
| Industrial Auxiliary Power | Automotive Housekeeping Supply |
|---|---|
Use Scenario: Providing isolated 5V/0.55A auxiliary power for PLC I/O modules, field transmitters, and gate drivers in 24V DC industrial systems. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output via reflected flyback waveform sampling - replaces opto-coupled solutions with higher reliability and smaller footprint. Use Value: Enables compact, maintenance-free 6W isolated supply with <±3% output regulation over temperature and line, meeting IEC 61000-4 immunity requirements. |
Use Scenario: Generating isolated 3.3V/0.8A power for automotive infotainment microcontrollers and CAN transceivers from 8V–16V battery rail. IC Role / Device Role / Timing Role: AEC-Q100 Grade I qualified flyback controller with boundary mode operation - delivers stable output during cold-crank (6.5V) and load-dump (42V) events. Use Value: Achieves >80% efficiency at 100mA–500mA load while maintaining <100µA quiescent current in sleep mode - extends battery life in always-on vehicle subsystems. |
| Medical Isolated Sensor Bias | Telecom Isolated Bias Rail |
Use Scenario: Delivering isolated 12V/0.22A bias for medical-grade isolated amplifiers and ADC front-ends in patient-connected equipment. IC Role / Device Role / Timing Role: No-opto flyback controller ensuring galvanic isolation compliance (IEC 60601-1) without opto aging or nonlinear response. Use Value: Provides <±5% output accuracy across –40°C to +85°C ambient with <0.5% minimum load requirement - eliminates need for post-regulation LDOs. |
Use Scenario: Generating isolated –48V/0.05A bias for telecom line-card supervisory circuits and hot-swap controllers in 48V distributed power architectures. IC Role / Device Role / Timing Role: High-voltage flyback controller supporting 1:4 transformer ratio - regulates negative output using standard diode rectification and RFB feedback polarity. Use Value: Enables single-chip isolated solution with 65V SW rating and 1.2A current limit - withstands telecom surge transients while minimizing transformer size and cost. |
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; supports up to 100V input; no integrated switch; uses opto feedback or third-winding sensing. | Used where higher input voltage (>42V) or higher output power (>6W) is needed; not suitable for space-constrained no-opto designs. | Select LT3748 when designing >42V input or >6W isolated supplies requiring external FET optimization; avoid if minimizing BOM count and PCB area is critical. |
| UCC28740DR | TI controller with integrated 600V MOSFET; uses primary-side sensing but requires different RFB scaling; 700V max SW rating. | Targeted at universal AC input (85–265VAC) offline flyback; not rated for automotive temperature range or AEC-Q100. | Choose UCC28740 for AC/DC adapter applications; LT8301IS5#TRPBF remains preferred for DC-fed automotive/industrial isolated supplies requiring –40°C to 125°C operation and no-opto simplicity. |
Compared with LT3748EMSE#TRPBF and UCC28740DR, the LT8301IS5#TRPBF uniquely combines integrated 65V/1.2A switch, no-opto regulation, AEC-Q100 qualification, and TSOT-23 packaging - making it the only solution that delivers 6W isolated power in <10mm² footprint with automotive-grade reliability and zero external feedback components.
Availability
LT8301IS5#TRPBF is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical instrumentation requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8301IS5#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. 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 optimized for compact, reliable, no-opto DC/DC conversion in space- and reliability-constrained applications - especially auxiliary power in automotive, industrial, and medical systems.
FAQ
What is the maximum isolated output power achievable with LT8301IS5#TRPBF?
The LT8301IS5#TRPBF delivers up to 6W of isolated output power, depending on input voltage, transformer turns ratio, and output voltage. At VIN = 36V and VOUT = 5V with a 3:1 transformer, typical output is 1.15A (5.75W). Power is limited by the 1.2A switch current limit and 65V SW pin rating - exceeding either risks device failure. Derating is recommended for continuous operation above 85°C ambient.
Does LT8301IS5#TRPBF require an opto-isolator or third transformer winding?
No. The LT8301IS5#TRPBF samples the isolated output voltage directly from the primary-side flyback waveform at the SW pin, eliminating the need for opto-isolators or third windings. This architecture reduces component count, improves long-term reliability, and avoids opto aging and nonlinearity - confirmed in the datasheet's "No Transformer Third Winding or Opto-Isolator Required for Regulation" feature list.
How is output voltage programmed on LT8301IS5#TRPBF?
Output voltage is set using a single external resistor (RFB) connected between the RFB pin and SW pin. With a trimmed 100µA regulation current and internal 10kΩ reference, VOUT ≈ (100µA × RFB)/NPS − VF, where NPS is the transformer primary-to-secondary turns ratio and VF is the output diode forward voltage (~0.3V). For example, a 154kΩ RFB with 3:1 turns ratio yields ~5V output.
What is the operating temperature range of LT8301IS5#TRPBF?
The LT8301IS5#TRPBF is specified for a junction temperature range of –40°C to 125°C and is AEC-Q100 qualified for automotive Grade I applications. This rating is explicitly stated in the "ORDER INFORMATION" table and "ELECTRICAL CHARACTERISTICS" section, distinguishing it from the E-grade (0°C to 125°C) and J/H-grade (–40°C to 150°C) variants.
Can LT8301IS5#TRPBF be used in Burst Mode® for low-noise applications?
Yes. The LT8301IS5#TRPBF features low-ripple Burst Mode® operation at light loads, maintaining output voltage ripple below 30mVpp while achieving >75% efficiency down to 6mA load. This is verified in Figure TA01b (Efficiency vs Load Current) and the "Low-Ripple Burst Mode® Operation at Light Load" feature list - making it suitable for powering noise-sensitive analog sensors and RF circuitry.
LT8301IS5#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):
- -
- 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
LT8301IS5#TRPBF FAQ
1.How can I place an order for LT8301IS5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8301IS5#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 LT8301IS5#TRPBF reliable?
The price and inventory of LT8301IS5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8301IS5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8301IS5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8301IS5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8301IS5#TRPBF?
LT8301IS5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8301IS5#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 LT8301IS5#TRPBF?
For technical support, including LT8301IS5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8301IS5#TRPBF requirements.
6.How does Aetrix verify that LT8301IS5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8301IS5#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 LT8301IS5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8301IS5#TRPBF?
All LT8301IS5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8301IS5#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 LT8301IS5#TRPBF part is unused and in its original packaging.
Return procedure for LT8301IS5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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