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Analog Devices Inc. LT8301IS5#WTRPBF
- Part No.:
- LT8301IS5#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT8301IS5#WTRPBF.pdf
- Description:
- IC REG FLYBACK 1.2A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,558
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Product details
Overview
LT8301IS5#WTRPBF 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 transformer winding by sampling the reflected flyback pulse on the SW pin, using boundary mode at heavy load and low-ripple Burst Mode® at light load for high efficiency across full load range. Used in automotive auxiliary power supplies requiring AEC-Q100 qualification.
For engineers reviewing the LT8301IS5#WTRPBF datasheet, LT8301IS5#WTRPBF pinout, LT8301IS5#WTRPBF application, or LT8301IS5#WTRPBF equivalent, key selection criteria include its 100µA sleep-mode quiescent current, 5-lead TSOT-23 package, internal compensation, no-opto regulation architecture, and AEC-Q100 Grade I (–40°C to 125°C) qualification for automotive reliability.
Technical Context
The LT8301IS5#WTRPBF implements primary-side sensing via flyback pulse amplitude sampling on the SW pin during zero-secondary-current events, enabling precise isolated output regulation without secondary-side feedback components. Its sample-and-hold error amplifier references a trimmed 1.0V internal reference and uses a 100µA RFB regulation current to set VOUT via a single external resistor.
It operates in boundary conduction mode (BCM) under heavy load-variable frequency, variable peak-current control with zero-current switching-and transitions to discontinuous conduction mode (DCM) and low-ripple Burst Mode® as load decreases, maintaining >75% efficiency down to 6mA output current while limiting output voltage ripple to <50mV peak-to-peak.
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 42VIN systems while providing overvoltage headroom for leakage spikes. |
| Quiescent Current | 100µA in Sleep Mode - minimizes standby power loss in always-on automotive housekeeping supplies. |
| RFB Regulation Current | 100µA ±2.5% - determines output voltage accuracy via external resistor; enables 5V output with ~154kΩ RFB (typ). |
| Operating Temp Range | –40°C to +125°C junction - AEC-Q100 qualified for automotive Grade I applications including infotainment and ADAS auxiliary power. |
| Switch On-Resistance | 0.4Ω max at 500mA - reduces conduction losses in compact 5W isolated designs, supporting high efficiency at full load. |
| Minimum Load Requirement | <0.5% of full output - allows stable operation down to ~6mA (for 5V/1.2A design), critical for low-power sensor interfaces. |
Pinout & Package
LT8301IS5#WTRPBF is housed in a 5-lead ThinSOT™ (TSOT-23) plastic package with θJA = 150°C/W, optimized for space-constrained isolated DC/DC modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Input Undervoltage Lockout | Accurate 1.228V threshold with 2.5µA hysteresis; enables programmable VIN UVLO using resistor divider or direct tie to VIN for always-on operation. |
| GND (Pin 2) | Power Ground Reference | Must connect directly to local ground plane; serves as return path for internal regulators and feedback circuitry. |
| RFB (Pin 3) | Feedback Resistor Input | Connects to SW via external resistor; 100µA current flows through RFB to set output voltage based on VOUT = (100µA × RFB)/NPS − VF. |
| SW (Pin 4) | Switch Drain Node | Drain of integrated 65V DMOS; carries high dv/dt flyback pulses; requires minimized trace area to reduce EMI and voltage overshoot. |
| VIN (Pin 5) | Main Input Supply | Supplies internal circuitry and serves as reference for RFB feedback; must be locally bypassed with ≥10µF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolated regulation | Eliminates opto-isolator and third winding, reducing BOM count, cost, and board area while avoiding opto aging and nonlinearities. |
| Boundary + Burst Mode operation | Enables high efficiency (>80%) across full load range: BCM maintains tight regulation at full load; low-ripple Burst Mode® sustains >75% efficiency at 1% load. |
| Internal compensation & soft-start | Reduces external component count to only RFB, transformer, input/output caps, and diode-no external loop compensation required. |
| Output short-circuit protection | Auto-recovery protection prevents damage during sustained short-circuit events without latch-off or manual reset. |
| AEC-Q100 Grade I qualification | Validated for automotive use across –40°C to +125°C junction temperature, including HTOL, TC, and ESD testing per AEC standards. |
Applications
| Automotive Auxiliary Power | Industrial Isolated Sensors |
|---|---|
Use Scenario: Powering CAN transceivers, LIN controllers, and position sensors in engine control units (ECUs) where primary 12V rail experiences cold-crank dips and load-dump surges. IC Role / Device Role / Timing Role: Primary-side isolated flyback controller regulating 5V/0.5A output from 6–42V automotive battery input. Use Value: Eliminates opto-isolator drift and aging, ensuring stable 5V supply across 15-year vehicle lifetime; 100µA sleep current extends battery life during ignition-off periods. |
Use Scenario: Providing galvanically isolated 3.3V power to analog front-end circuits in hazardous-area pressure/temperature transmitters. IC Role / Device Role / Timing Role: Micropower isolated flyback controller delivering 3.3V/0.8A from 24V industrial bus with reinforced isolation barrier. Use Value: Boundary mode ensures excellent load regulation (<±2%) despite varying sensor loading; 5-lead TSOT-23 enables compact PCB layout meeting IEC 60079-11 creepage requirements. |
| Medical Patient Monitoring | Telecom Housekeeping Supply |
Use Scenario: Generating isolated 5V bias for ECG electrode amplifiers and ADCs in portable patient monitors requiring 4kV reinforced isolation. IC Role / Device Role / Timing Role: No-opto flyback controller implementing primary-side regulation to meet IEC 60601-1 creepage/clearance and leakage current limits. Use Value: Removes opto-isolator CTR degradation risk, guaranteeing long-term accuracy; low 350µA active IQ supports extended battery runtime in handheld devices. |
Use Scenario: Delivering 12V/0.22A isolated auxiliary power to microcontrollers and PHYs in optical line terminals (OLTs) with strict thermal constraints. IC Role / Device Role / Timing Role: High-efficiency isolated flyback controller operating from 48V telecom input, supporting burst-mode operation during low-traffic periods. Use Value: Low-ripple Burst Mode® maintains <50mV output ripple at 10mA load, preventing noise coupling into sensitive clock recovery circuits. |
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; higher minimum input (4.5V); supports up to 100V input. | Better suited for high-voltage industrial supplies (>60V) where discrete switch selection is needed; lacks AEC-Q100 qualification. | Select when input exceeds 42V or when discrete FET optimization (e.g., SiC/GaN) is required; not drop-in compatible due to different pinout and external gate drive. |
| UCC28740DR | TI part with integrated 700V MOSFET; higher voltage rating but larger SOIC-7 package; 150µA typical IQ in shutdown. | Targeted at universal AC/DC adapters (85–265VAC); not AEC-Q100 qualified; lacks low-ripple Burst Mode®. | Choose for offline AC/DC applications requiring higher input voltage tolerance; unsuitable for automotive due to temperature grade and qualification gap. |
Compared with LT3748EMS#TRPBF and UCC28740DR, the LT8301IS5#WTRPBF offers the only combination of integrated 65V/1.2A switch, 100µA sleep IQ, AEC-Q100 Grade I rating, and no-opto regulation in a 5-lead TSOT-23-making it uniquely suitable for space- and reliability-constrained automotive auxiliary power designs.
Availability
LT8301IS5#WTRPBF is available at Aetrix Electronics and suitable for automotive auxiliary power, industrial isolated sensors, medical patient monitoring, and telecom housekeeping supplies requiring stable component supply, long-lifecycle support, and AEC-Q100 compliance.
Supply support for LT8301IS5#WTRPBF 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 LT8301IS5#WTRPBF belongs to ADI's µModule® and isolated power controller product line, designed specifically for compact, reliable, no-opto isolated DC/DC conversion in safety-critical and space-constrained applications.
FAQ
What is the maximum output power achievable with LT8301IS5#WTRPBF?
The LT8301IS5#WTRPBF delivers up to 6W of isolated output power depending on input voltage, transformer turns ratio, and output voltage. For example, at VIN = 36V and VOUT = 5V with a 3:1 transformer, it supports 1.15A output (5.75W). Maximum power is constrained by the 1.2A switch current limit and 65V SW pin rating, requiring careful selection of NPS to avoid exceeding 65V under worst-case leakage spike conditions.
Does LT8301IS5#WTRPBF require an opto-isolator or third transformer winding?
No, the LT8301IS5#WTRPBF does not require an opto-isolator or third transformer winding. It achieves precise isolated output regulation by sampling the reflected flyback voltage on the SW pin during zero-secondary-current events, using an internal sample-and-hold error amplifier referenced to a trimmed 1.0V bandgap and 100µA RFB regulation current.
What is the purpose of the RFB pin on LT8301IS5#WTRPBF?
The RFB pin on LT8301IS5#WTRPBF connects to the SW node via an external resistor and sinks a precise 100µA regulation current. This current, flowing through the RFB resistor, sets the output voltage according to VOUT ≈ (100µA × RFB)/NPS − VF, where NPS is the transformer primary-to-secondary turns ratio and VF is the output diode forward voltage.
Is LT8301IS5#WTRPBF qualified for automotive applications?
Yes, the LT8301IS5#WTRPBF is AEC-Q100 qualified for automotive applications (Grade I, –40°C to +125°C junction temperature). It undergoes rigorous stress testing including HTOL, temperature cycling, and ESD per AEC standards, and is designated with the #W suffix indicating controlled manufacturing for automotive reliability.
How does LT8301IS5#WTRPBF manage light-load efficiency?
The LT8301IS5#WTRPBF maintains high light-load efficiency using low-ripple Burst Mode® operation, which cycles between active switching bursts and sleep mode. During bursts, it samples the output voltage accurately; during sleep, quiescent current drops to 100µA. This achieves >75% efficiency at 6mA load while keeping output ripple below 50mV peak-to-peak.
LT8301IS5#WTRPBF 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 ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT8301IS5#WTRPBF FAQ
1.How can I place an order for LT8301IS5#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8301IS5#WTRPBF 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#WTRPBF reliable?
The price and inventory of LT8301IS5#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8301IS5#WTRPBF is usually 5 days.
3.What payment methods are accepted for LT8301IS5#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8301IS5#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8301IS5#WTRPBF?
LT8301IS5#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8301IS5#WTRPBF 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#WTRPBF?
For technical support, including LT8301IS5#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8301IS5#WTRPBF requirements.
6.How does Aetrix verify that LT8301IS5#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LT8301IS5#WTRPBF 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#WTRPBF meets industry standards.
7.What is the process for return or replacement of LT8301IS5#WTRPBF?
All LT8301IS5#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8301IS5#WTRPBF, 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#WTRPBF part is unused and in its original packaging.
Return procedure for LT8301IS5#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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