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Analog Devices Inc. LT8301MPS5#TRPBF
- Part No.:
- LT8301MPS5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT8301MPS5#TRPBF.pdf
- Description:
- IC REG FLYBACK 1.2A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,133
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Product details
Overview
LT8301MPS5#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 features boundary mode at heavy load and low-ripple Burst Mode® at light load - enabling compact, high-efficiency auxiliary power supplies in automotive and industrial systems.
For engineers reviewing the LT8301MPS5#TRPBF datasheet, LT8301MPS5#TRPBF pinout, LT8301MPS5#TRPBF application, or LT8301MPS5#TRPBF equivalent, key selection considerations include its –55°C to 150°C extended temperature grade, 100µA sleep-mode quiescent current, 5-lead TSOT-23 package, internal compensation, and AEC-Q100 qualification for automotive use.
Technical Context
The LT8301MPS5#TRPBF implements primary-side sensing via flyback pulse amplitude on the SW pin, enabling regulation without secondary-side feedback components. Its sample-and-hold error amplifier samples only when secondary current reaches zero - ensuring accurate VOUT tracking across load and line variations.
It operates in three distinct modes: boundary conduction mode (BCM) at heavy loads (variable frequency, zero-current switching), discontinuous conduction mode (DCM) under frequency clamping (<430kHz), and low-ripple Burst Mode® at ultra-light loads - where it alternates between active and sleep states to maintain <0.5% minimum load requirement and 350µA active IQ.
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. |
| Output Power | Up to 6W isolated - sufficient for auxiliary/housekeeping rails in telecom, medical, and control systems. |
| Integrated Switch | 65V/1.2A DMOS - eliminates external high-voltage switch; enables compact transformer design with NPS ≤ 3:1 for 5V outputs at 36VIN. |
| Quiescent Current | 100µA in sleep mode - extends battery life in always-on systems; enables self-powered operation from low-VIN sources. |
| Regulation Method | Primary-side flyback sampling - removes opto-isolator and third winding, reducing BOM count, cost, and layout complexity. |
| Operating Modes | Boundary mode (heavy load), DCM (mid-load), low-ripple Burst Mode® (light load) - maintains >75% efficiency from 6mA to full load. |
| Temperature Range | –55°C to 150°C junction - qualified per AEC-Q100 Grade MP, suitable for under-hood and harsh-environment applications. |
Pinout & Package
LT8301MPS5#TRPBF is housed in a 5-lead ThinSOT™ (TSOT-23) package with θJA = 150°C/W, optimized for thermal performance in space-constrained isolated power designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Undervoltage Lockout Input | Accurate 1.228V threshold with 2.5µA hysteresis; enables VIN UVLO programming via resistor divider or direct tie-to-VIN for always-on operation. |
| GND (Pin 2) | Power Ground Reference | Low-impedance return path for internal regulators and feedback circuitry; must connect directly to local ground plane. |
| RFB (Pin 3) | Feedback Resistor Terminal | Connects external RFB to SW; sets VOUT via 100µA regulation current × RFB, scaled by transformer turns ratio and diode VF. |
| SW (Pin 4) | Switch Drain Node | Drain of integrated 65V DMOS; carries primary current and flyback voltage spikes - requires minimized trace area for EMI and voltage spike control. |
| VIN (Pin 5) | Main Input Supply | Powers internal circuitry and serves as reference for RFB feedback; requires local ceramic bypass capacitor (≥1µF) to GND. |
Key Features
| Feature | Design Value |
|---|---|
| No opto-isolator or third winding required | Reduces component count, cost, and board area while eliminating opto aging, nonlinearity, and dynamic response limitations. |
| Single-resistor VOUT programming | Enables precise output setting (e.g., 3.3V, 5V, 12V) with only RFB - no trimming or secondary feedback network needed. |
| Internal compensation & soft-start | Eliminates external compensation components and startup inrush control circuitry - simplifies design and improves reliability. |
| Output short-circuit protection | Auto-recovery protection prevents latch-up during fault conditions - ensures robust operation in unattended systems. |
| AEC-Q100 Grade MP qualification | Validated for automotive under-hood use with –55°C to 150°C operation, meeting stringent reliability and lifetime requirements. |
Applications
| Automotive Body Control Module (BCM) Auxiliary Supply | Industrial PLC Isolated I/O Power |
|---|---|
Use Scenario: Provides isolated 5V/0.55A auxiliary rail for microcontroller, CAN transceiver, and sensor interface in vehicle body control units exposed to –40°C to 125°C ambient. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output without opto-isolator; handles cold-crank (4.5V) and load-dump (42V) transients. Use Value: Enables compact, AEC-Q100-compliant power architecture with <100µA sleep IQ - extending battery standby time and eliminating opto drift over 15-year vehicle life. | Use Scenario: Generates isolated 3.3V/0.8A supply for digital I/O isolation barriers and fieldbus interface circuits in programmable logic controllers operating in factory environments. IC Role / Device Role / Timing Role: Micropower flyback controller delivering stable output across 18–42V DC input range with boundary mode for tight load regulation. Use Value: Reduces transformer size and total BOM count by 30% vs. opto-based solutions while maintaining ±5% output accuracy over temperature and line variation. |
| Medical Patient Monitoring Auxiliary Rail | Telecom Base Station Housekeeping Supply |
Use Scenario: Supplies isolated 5V/0.42A power to analog front-end and ADC in portable patient monitors requiring reinforced isolation and low EMI. IC Role / Device Role / Timing Role: Boundary-mode flyback controller with low-ripple Burst Mode® operation - minimizes conducted noise into sensitive analog signal paths. Use Value: Achieves <15mVpp output ripple at light load and meets IEC 60601 creepage/clearance requirements using standard 5-pin TSOT-23 layout. | Use Scenario: Delivers isolated 12V/0.22A housekeeping power to control logic and bias rails in 48V telecom rectifier modules with wide ambient temperature swing. IC Role / Device Role / Timing Role: High-integration flyback controller supporting 8–30V input range and 150°C max junction temperature for fanless chassis operation. Use Value: Enables single-chip solution with no external MOSFET or compensation - reducing footprint by 40% and improving MTBF over discrete alternatives. |
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; higher BOM count. | Better suited for >6W or >65V applications where LT8301MPS5#TRPBF's integrated switch limits headroom. | Select when higher input voltage (>42V) or higher output power (>6W) is required - but expect added layout complexity and thermal management overhead. |
| UCC28911DR | TI part with 700V integrated MOSFET; fixed 70kHz frequency; no boundary mode; higher IQ (250µA sleep). | Targeted at universal AC input (85–265VAC) offline flyback; not rated for automotive temp or AEC-Q100. | Choose for AC/DC adapter applications with high-VIN requirements - avoid for automotive or extended-temp DC/DC due to qualification gap and lack of BCM optimization. |
Compared with LT3748EMSE#TRPBF and UCC28911DR, the LT8301MPS5#TRPBF delivers the lowest system-level component count and smallest PCB footprint for ≤6W isolated DC/DC, while uniquely combining AEC-Q100 MP-grade operation, primary-side sensing, and multi-mode efficiency optimization - making it optimal for space- and reliability-critical automotive and industrial auxiliary supplies.
Availability
LT8301MPS5#TRPBF is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O power, medical monitoring auxiliary rails, and telecom housekeeping supplies requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT8301MPS5#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 with integrated switches for compact, reliable auxiliary power in harsh environments - designed specifically to replace opto-coupled solutions in automotive, medical, and industrial systems.
FAQ
What is the maximum output power achievable with LT8301MPS5#TRPBF?
The LT8301MPS5#TRPBF delivers up to 6W of isolated output power, depending on input voltage, transformer turns ratio, and output voltage. At 36V input with a 3:1 transformer and 5V output, it sustains ~5.4W; at 8V input, output drops to ~2.7W. The 1.2A/65V integrated switch and boundary mode operation enable this power level in a 5-lead TSOT-23 package without external MOSFETs.
Does LT8301MPS5#TRPBF require an opto-isolator or third winding for regulation?
No, the LT8301MPS5#TRPBF does not require an opto-isolator or third winding. It regulates the isolated output voltage by sampling the reflected flyback pulse amplitude on the SW pin during zero-secondary-current intervals. This primary-side sensing method eliminates opto aging, nonlinearity, and extra transformer windings - reducing BOM count and improving long-term stability.
What is the operating temperature range of LT8301MPS5#TRPBF?
The LT8301MPS5#TRPBF is specified for a junction temperature range of –55°C to 150°C and is AEC-Q100 qualified for automotive Grade MP applications. This extended range supports under-hood automotive use, industrial control cabinets, and other harsh-environment deployments where conventional commercial-grade controllers would fail.
How is output voltage set on LT8301MPS5#TRPBF?
Output voltage on the LT8301MPS5#TRPBF is set using a single external resistor (RFB) connected between the RFB pin and the SW pin. With a nominal 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. A two-step calibration process ensures ±5% accuracy across production units.
What protection features does LT8301MPS5#TRPBF include?
The LT8301MPS5#TRPBF includes output short-circuit protection with auto-recovery, overtemperature protection that disables switching above 150°C, and internal current limiting (1.2A min) with leading-edge blanking. It also features accurate EN/UVLO with hysteresis (1.228V threshold, 2.5µA hysteresis current) to prevent erratic startup during brownout conditions - all implemented without external components.
LT8301MPS5#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT8301MPS5#TRPBF FAQ
1.How can I place an order for LT8301MPS5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8301MPS5#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 LT8301MPS5#TRPBF reliable?
The price and inventory of LT8301MPS5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8301MPS5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8301MPS5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8301MPS5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8301MPS5#TRPBF?
LT8301MPS5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8301MPS5#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 LT8301MPS5#TRPBF?
For technical support, including LT8301MPS5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8301MPS5#TRPBF requirements.
6.How does Aetrix verify that LT8301MPS5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8301MPS5#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 LT8301MPS5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8301MPS5#TRPBF?
All LT8301MPS5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8301MPS5#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 LT8301MPS5#TRPBF part is unused and in its original packaging.
Return procedure for LT8301MPS5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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