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Analog Devices Inc. LT8301JS5#WTRMPBF
- Part No.:
- LT8301JS5#WTRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT8301JS5#WTRMPBF.pdf
- Description:
- IC REG FLYBACK 1.2A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:945
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Product details
Overview
LT8301JS5#WTRMPBF 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 auxiliary power supplies, it features AEC-Q100 qualification, boundary mode operation, and low-ripple Burst Mode® for high light-load efficiency.
For engineers reviewing the LT8301JS5#WTRMPBF datasheet, LT8301JS5#WTRMPBF pinout, LT8301JS5#WTRMPBF application, or LT8301JS5#WTRMPBF equivalent, key selection considerations include its –40°C to 150°C junction temperature rating, 100µA sleep-mode quiescent current, 5-lead TSOT-23 package, internal compensation, and no-opto isolated feedback architecture.
Technical Context
The LT8301JS5#WTRMPBF implements current-mode control in boundary conduction mode (BCM) at heavy loads and transitions to discontinuous conduction mode (DCM) with frequency clamping below 430kHz to limit switching losses. Its flyback pulse sense circuit samples the SW pin voltage when secondary current reaches zero, enabling accurate isolated regulation without secondary-side components.
It integrates a 1.2A/65V DMOS switch, EN/UVLO with 1.228V enable threshold and 2.5µA hysteresis current, internal 10kΩ RREF reference, and sample-and-hold error amplifier referenced to a trimmed 1.0V bandgap. Minimum switch-on time (170ns) and minimum switch-off time (450ns) enforce stable sampling and prevent leading-edge blanking failure.
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 5V–24V isolated outputs with transformer turns ratios up to ~4:1 while staying within safe SOA. |
| Quiescent Current | 100µA in sleep mode - minimizes standby power loss in always-on auxiliary supplies. |
| Output Power Capability | Up to 6W - achievable with optimized transformer (e.g., Würth 750313974, 3:1, 40µH) and 24V input. |
| Operating Temperature | –40°C to 150°C junction - qualified per AEC-Q100 Grade 1, suitable for under-hood automotive applications. |
| Regulation Method | Primary-side sensing via SW pin flyback pulse - eliminates opto-isolator, third winding, and associated aging/nonlinearity issues. |
| Feedback Programming | Single external RFB resistor - sets VOUT = (100µA × RFB)/NPS − VF, enabling rapid design iteration without secondary feedback loop tuning. |
Pinout & Package
LT8301JS5#WTRMPBF is housed in a 5-lead plastic TSOT-23 package (S5), with θJA = 150°C/W, designed for compact isolated DC/DC solutions on space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable and undervoltage lockout input | Accurate 1.228V enable threshold with 2.5µA hysteresis current - allows precise VIN UVLO programming using a resistor divider; tie to VIN if unused. |
| GND (Pin 2) | Power and signal ground reference | Must connect directly to local ground plane - serves as return path for internal regulators and feedback reference. |
| RFB (Pin 3) | External feedback resistor connection | Connects to SW via RFB; current into this pin is regulated at 100µA - determines output voltage via transformer turns ratio and diode drop. |
| SW (Pin 4) | Drain of internal 65V/1.2A DMOS switch | Carries primary-side switching current and flyback voltage - requires minimized trace area to reduce EMI and leakage-induced voltage spikes. |
| VIN (Pin 5) | Main input supply and reference rail | Supplies internal circuitry and provides reference for RFB feedback - must be locally bypassed with ≥1µF ceramic capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolated regulation | Eliminates opto-isolator and third winding - reduces BOM count, cost, and long-term drift due to LED aging and CTR variation. |
| Boundary + Burst Mode operation | BCM ensures zero-current switching at full load for high efficiency; low-ripple Burst Mode maintains >75% efficiency down to 0.5% load without audible noise. |
| Internal compensation & soft-start | Reduces external component count by integrating loop compensation and controlled startup - prevents inrush current and output overshoot. |
| AEC-Q100 Grade 1 qualification | Validated for automotive use across –40°C to 150°C junction temperature - meets reliability and stress-test requirements for engine control and body electronics. |
| Output short-circuit protection | Auto-recovery hiccup mode limits power dissipation during fault - protects transformer, diode, and IC during sustained overload or short. |
Applications
| Automotive Auxiliary Power Supply | Industrial Isolated Sensor Interface |
|---|---|
|
Use Scenario: Providing isolated 5V/0.5A housekeeping power for CAN transceivers, microcontrollers, and analog front-ends in engine control units (ECUs). IC Role / Device Role / Timing Role: Primary-side flyback controller with integrated switch - delivers regulated isolated output without secondary feedback components. Use Value: Enables compact, AEC-Q100-compliant power stage with <100µA sleep current, supporting always-on diagnostics and low-power wake-up functionality. |
Use Scenario: Generating isolated 3.3V/0.8A supply for precision ADCs and isolated RS-485 transceivers in factory automation I/O modules. IC Role / Device Role / Timing Role: Micropower isolated flyback controller - replaces discrete opto-coupled solutions with higher reliability and tighter regulation over temperature. Use Value: Achieves ±5% output regulation across –40°C to 85°C ambient using Würth 750313973 (4:1) transformer, eliminating calibration drift from opto aging. |
| Medical Patient Monitoring Auxiliary Rail | Telecom Isolated Bias Supply |
|
Use Scenario: Delivering reinforced-isolation 12V/0.22A bias for isolated amplifiers and digital isolators in portable ECG and EEG devices. IC Role / Device Role / Timing Role: No-opto flyback controller - satisfies creepage/clearance requirements while avoiding opto CTR degradation affecting long-term accuracy. Use Value: Supports 2×MOPP isolation with Sumida 12387-T039 (1:4) transformer; 150°C max junction rating ensures thermal margin in sealed enclosures. |
Use Scenario: Generating isolated –48V backup bias for hot-swap controllers and protection ICs in telecom line cards with strict efficiency targets. IC Role / Device Role / Timing Role: High-voltage flyback controller - operates from 36V–72V nominal input with 42V absolute max, compatible with telecom intermediate bus architectures. Use Value: Delivers >78% efficiency at 10% load using low-ripple Burst Mode, reducing heat buildup in densely packed line card designs. |
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-coupled feedback or auxiliary winding. | Better suited for >6W or >65V output applications where layout flexibility and higher power density are needed. | Select LT3748 when higher output power (>6W), wider input range (>42V), or discrete FET optimization is required. |
| UCC28911DR | TI part with integrated 700V MOSFET; fixed 65kHz frequency; no boundary mode; uses primary-side sensing but different algorithm. | Targeted at universal AC input (85–265VAC) offline flyback, not DC-DC isolated conversion from 2.7–42V. | Choose UCC28911 only for AC/DC adapter-style designs; not a functional substitute for LT8301JS5#WTRMPBF's low-VIN, no-opto, automotive-grade operation. |
Compared with LT3748EMSE#TRPBF and UCC28911DR, the LT8301JS5#WTRMPBF uniquely combines integrated 65V/1.2A switching, AEC-Q100 qualification, and true no-opto regulation in a 5-lead TSOT-23 - making it the only option for compact, automotive-qualified, low-input isolated DC/DC converters requiring minimal external components.
Availability
LT8301JS5#WTRMPBF is available at Aetrix Electronics and suitable for automotive auxiliary power supplies, industrial sensor interfaces, medical patient monitoring systems, and telecom isolated bias supplies requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for LT8301JS5#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. 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 isolated flyback controllers optimized for compact, no-opto, low-component-count DC/DC conversion - specifically targeting automotive, medical, and industrial applications demanding high reliability and wide temperature operation.
FAQ
What is the maximum output power achievable with LT8301JS5#WTRMPBF?
The LT8301JS5#WTRMPBF can deliver up to 6W of isolated output power, contingent on input voltage, transformer selection, and layout. For example, with VIN = 24V, a Würth 750313974 (3:1) transformer, and 5V output, typical performance achieves 5.5W at >82% efficiency. Output power scales with input voltage and transformer turns ratio but must keep SW pin voltage below 65V including leakage spikes.
Does LT8301JS5#WTRMPBF require an opto-isolator or third winding for regulation?
No, the LT8301JS5#WTRMPBF does not require an opto-isolator or third winding. It regulates the isolated output by sampling the reflected flyback voltage directly at the SW pin during zero-secondary-current events. This primary-side sensing architecture eliminates opto aging, CTR variation, and extra transformer windings - confirmed in the device's block diagram and operation description.
What is the operating temperature range for LT8301JS5#WTRMPBF?
The LT8301JS5#WTRMPBF is rated for a junction temperature range of –40°C to 150°C and is AEC-Q100 qualified for automotive Grade 1 applications. This extended range enables deployment in under-hood environments and other high-temperature industrial settings where standard commercial-grade controllers would fail.
How is output voltage set on LT8301JS5#WTRMPBF?
Output voltage is set using a single external resistor (RFB) connected between the RFB pin and SW pin. The relationship is 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). A two-step tuning process (initial calculation followed by measurement and adjustment) ensures ±5% regulation accuracy.
Is LT8301JS5#WTRMPBF pin-compatible with other LT8301 variants?
Yes, all LT8301 variants-including LT8301ES5#TRMPBF, LT8301IS5#TRMPBF, and LT8301JS5#WTRMPBF-share identical 5-lead TSOT-23 (S5) pinout and electrical functionality. The only differences are temperature grade (–40°C to 125°C vs. –40°C to 150°C) and automotive qualification (W-suffix denotes AEC-Q100 compliance); no PCB changes are required when upgrading to LT8301JS5#WTRMPBF.
LT8301JS5#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 ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT8301JS5#WTRMPBF FAQ
1.How can I place an order for LT8301JS5#WTRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8301JS5#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 LT8301JS5#WTRMPBF reliable?
The price and inventory of LT8301JS5#WTRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8301JS5#WTRMPBF is usually 5 days.
3.What payment methods are accepted for LT8301JS5#WTRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8301JS5#WTRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8301JS5#WTRMPBF?
LT8301JS5#WTRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8301JS5#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 LT8301JS5#WTRMPBF?
For technical support, including LT8301JS5#WTRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8301JS5#WTRMPBF requirements.
6.How does Aetrix verify that LT8301JS5#WTRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8301JS5#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 LT8301JS5#WTRMPBF meets industry standards.
7.What is the process for return or replacement of LT8301JS5#WTRMPBF?
All LT8301JS5#WTRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8301JS5#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 LT8301JS5#WTRMPBF part is unused and in its original packaging.
Return procedure for LT8301JS5#WTRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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