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Analog Devices Inc. LT8301IS5#WTRMPBF
- Part No.:
- LT8301IS5#WTRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT8301IS5#WTRMPBF.pdf
- Description:
- IC REG FLYBACK 1.2A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:647
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Product details
Overview
LT8301IS5#WTRMPBF from Analog Devices is a micropower isolated flyback converter 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 auxiliary power supplies, it features boundary mode at heavy load and low-ripple Burst Mode® at light load.
For engineers reviewing the LT8301IS5#WTRMPBF datasheet, LT8301IS5#WTRMPBF pinout, LT8301IS5#WTRMPBF application, or LT8301IS5#WTRMPBF equivalent, key selection considerations include its AEC-Q100 qualification, 100µA sleep-mode quiescent current, 5-lead TSOT-23 package, internal compensation, and no-opto isolated regulation architecture.
Technical Context
The LT8301IS5#WTRMPBF implements current-mode control with boundary conduction mode (BCM) at heavy loads and transitions to discontinuous conduction mode (DCM) when switching frequency reaches ~430kHz. Its flyback pulse sense circuit samples the reflected output voltage on the SW pin precisely at zero secondary current, enabling accurate regulation without secondary-side feedback components.
It integrates a 1.2A/65V DMOS switch, internal 1.0V reference, 10kΩ RREF, soft-start, overtemperature protection, and output short-circuit protection. The EN/UVLO pin provides programmable undervoltage lockout with 1.228V threshold and 2.5µA hysteresis current, supporting precise input voltage supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 42V - supports wide industrial and automotive battery inputs including cold-crank and load-dump conditions. |
| Output Power | Up to 6W - enables compact isolated housekeeping rails for microcontrollers, sensors, and gate drivers. |
| Switch Rating | 65V/1.2A DMOS - withstands flyback voltage spikes up to 65V while delivering ≥1A continuous output current at typical configurations. |
| Quiescent Current | 100µA in Sleep Mode - minimizes standby power loss in always-on automotive systems. |
| Regulation Method | Primary-side sampling from SW pin - eliminates opto-isolator, third winding, and associated aging, nonlinearity, and layout sensitivity. |
| Operating Modes | Boundary mode (heavy load), DCM (mid-load), low-ripple Burst Mode® (light load) - balances efficiency, EMI, and output ripple across full load range. |
| Package | 5-Lead TSOT-23 - surface-mount, thermally enhanced plastic package with θJA = 150°C/W for space-constrained PCBs. |
Pinout & Package
LT8301IS5#WTRMPBF is housed in a 5-lead plastic TSOT-23 package (S5), with exposed pad for thermal enhancement. Pin 1 is EN/UVLO, Pin 2 is GND, Pin 3 is RFB, Pin 4 is SW (drain of internal DMOS switch), and Pin 5 is VIN. The package footprint matches JEDEC MO-178AA standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable and input undervoltage lockout input | Shuts down device below 0.2V; 1.228V threshold enables precise VIN UVLO programming with resistor divider and 2.5µA hysteresis current. |
| GND (Pin 2) | Power and signal ground reference | Must connect directly to local ground plane to minimize noise coupling into sensitive analog blocks and RFB node. |
| RFB (Pin 3) | Feedback current input for output voltage setting | Accepts 100µA regulation current; RFB value determines VOUT via VOUT ≈ (100µA × RFB)/NPS − VF, where NPS is transformer turns ratio. |
| SW (Pin 4) | Drain of internal 65V/1.2A DMOS switch | Carries high dv/dt flyback pulses; requires minimized trace area and tight layout to suppress EMI and prevent voltage overshoot beyond 65V rating. |
| VIN (Pin 5) | Main input supply and reference for feedback circuitry | Supplies internal regulators and serves as reference for RFB amplifier; must be locally bypassed with low-ESR capacitor to stabilize operation. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolated regulation | Eliminates opto-isolator and third winding - reduces BOM count, cost, board area, and long-term drift due to LED aging. |
| Single-resistor VOUT programming | Output voltage set by one external RFB resistor - simplifies design iteration and enables field-adjustable outputs via resistor change. |
| Low-ripple Burst Mode® | Maintains <1% output voltage ripple at light loads while achieving >75% efficiency at 1mA - critical for noise-sensitive analog and RF subsystems. |
| AEC-Q100 qualified | Rated for –40°C to +125°C junction temperature - validated for automotive under-hood and infotainment applications per stress test requirements. |
| Internal compensation & soft-start | Reduces external component count by eliminating loop compensation network and startup inrush control circuitry. |
Applications
| Automotive Auxiliary Power Supply | Industrial Isolated Sensor Interface |
|---|---|
Use Scenario: Providing isolated 5V/0.5A power to CAN transceivers and microcontrollers in vehicle body control modules. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller generating stable isolated rail without secondary feedback components. Use Value: Enables compact, AEC-Q100-compliant auxiliary supply with <100µA quiescent current - meets automotive ISO 16750-2 standby power requirements. | Use Scenario: Powering isolated analog front-ends for 4–20mA current-loop sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Isolated flyback controller delivering galvanically separated 3.3V/0.8A output for precision ADCs and signal conditioners. Use Value: Achieves ±5% output regulation across temperature using pre-characterized Würth transformers (e.g., 750370047) - eliminates need for post-production trimming. |
| Medical Patient Monitoring Auxiliary Rail | Telecom Isolated Housekeeping Supply |
Use Scenario: Generating isolated 12V/0.22A bias for optical isolators and low-noise LDOs in portable ECG monitors. IC Role / Device Role / Timing Role: Micropower flyback controller ensuring creepage/clearance compliance while minimizing standby consumption. Use Value: Delivers 12V output with <0.5% minimum load requirement - supports ultra-low-power sleep states required by IEC 60601-1 safety standards. | Use Scenario: Supplying isolated 5V/0.42A power to FPGA configuration circuits and management controllers in telecom line cards. IC Role / Device Role / Timing Role: Boundary-mode flyback controller providing high-efficiency, low-EMI isolated bias independent of main system rail. Use Value: Maintains >80% efficiency from 10mA to full load using Sumida 12387-T041 transformer - reduces thermal load in dense card stacks. |
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#PBF | Requires external MOSFET; supports higher input (100V) and output power (15W); no integrated switch. | Better suited for >10W designs requiring higher voltage tolerance and adjustable current limit. | Select LT3748EMS#PBF when higher power or input voltage headroom is needed; LT8301IS5#WTRMPBF is preferred for compact ≤6W AEC-Q100 designs. |
| UCC28740DR | TI part with integrated 700V MOSFET; uses different primary-sensing method; higher quiescent current (220µA active mode). | Targeted at universal-input AC/DC adapters; lacks AEC-Q100 qualification and automotive temp grade. | Choose UCC28740DR for cost-sensitive AC/DC applications; LT8301IS5#WTRMPBF remains optimal for DC-input automotive isolation with lower IQ and smaller footprint. |
Compared with LT3748EMS#PBF and UCC28740DR, the LT8301IS5#WTRMPBF offers the smallest solution size (5-pin TSOT-23), lowest sleep-mode IQ (100µA), and direct AEC-Q100 qualification - making it uniquely suitable for space- and power-constrained automotive auxiliary supplies.
Availability
LT8301IS5#WTRMPBF is available at Aetrix Electronics and suitable for automotive auxiliary power supplies, industrial isolated sensor interfaces, medical patient monitoring auxiliary rails, and telecom isolated housekeeping supplies requiring stable component supply, AEC-Q100 compliance, and micropower operation.
Supply support for LT8301IS5#WTRMPBF 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 LT8301 product line delivers micropower, no-opto isolated flyback controllers optimized for compact, reliable, and AEC-Q100-qualified auxiliary power in automotive and industrial systems - emphasizing simplicity, low IQ, and primary-side regulation.
FAQ
What is the maximum input voltage supported by the LT8301IS5#WTRMPBF?
The LT8301IS5#WTRMPBF supports an absolute maximum input voltage of 42V, with recommended operating range from 2.7V to 42V. This allows robust operation across automotive battery voltages including cold-crank (down to ~2.7V) and load-dump transients (up to 42V). Exceeding 42V risks damage to the VIN pin and internal regulators.
How does the LT8301IS5#WTRMPBF regulate output voltage without an opto-isolator?
The LT8301IS5#WTRMPBF samples the isolated output voltage directly from the primary-side flyback waveform on the SW pin, precisely at the moment secondary current reaches zero. This sampled voltage is converted to a 100µA regulation current flowing into the RFB pin, enabling closed-loop control without opto-isolators, third windings, or secondary-side components.
What is the purpose of the RFB pin on the LT8301IS5#WTRMPBF?
The RFB pin on the LT8301IS5#WTRMPBF accepts a 100µA regulation current used to set the output voltage. Connecting an external resistor (RFB) between RFB and SW establishes VOUT ≈ (100µA × RFB)/NPS − VF, where NPS is the transformer turns ratio and VF is the output diode forward voltage. This single-resistor method simplifies design and enables precise output adjustment.
Is the LT8301IS5#WTRMPBF qualified for automotive applications?
Yes, the LT8301IS5#WTRMPBF is AEC-Q100 qualified for automotive applications, rated for operation from –40°C to +125°C junction temperature. It is specifically designated with the #W suffix (WTRMPBF) indicating controlled manufacturing and reliability validation for under-hood and infotainment use cases per automotive quality standards.
What are the key differences between boundary mode and Burst Mode® operation in the LT8301IS5#WTRMPBF?
Boundary mode operates at variable frequency and peak current for high efficiency at medium-to-heavy loads, returning secondary current to zero each cycle to improve regulation. Burst Mode® activates at light loads, reducing effective switching frequency to ~10kHz while maintaining low output ripple and dropping quiescent current to 100µA - optimizing efficiency below 10% load without sacrificing stability.
LT8301IS5#WTRMPBF 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#WTRMPBF FAQ
1.How can I place an order for LT8301IS5#WTRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8301IS5#WTRMPBF 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#WTRMPBF reliable?
The price and inventory of LT8301IS5#WTRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8301IS5#WTRMPBF is usually 5 days.
3.What payment methods are accepted for LT8301IS5#WTRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8301IS5#WTRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8301IS5#WTRMPBF?
LT8301IS5#WTRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8301IS5#WTRMPBF 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#WTRMPBF?
For technical support, including LT8301IS5#WTRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8301IS5#WTRMPBF requirements.
6.How does Aetrix verify that LT8301IS5#WTRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8301IS5#WTRMPBF 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#WTRMPBF meets industry standards.
7.What is the process for return or replacement of LT8301IS5#WTRMPBF?
All LT8301IS5#WTRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8301IS5#WTRMPBF, 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#WTRMPBF part is unused and in its original packaging.
Return procedure for LT8301IS5#WTRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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