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Analog Devices Inc. LT8301MPS5#TRMPBF
- Part No.:
- LT8301MPS5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT8301MPS5#TRMPBF.pdf
- Description:
- IC REG FLYBACK 1.2A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,561
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Product details
Overview
LT8301MPS5#TRMPBF from Analog Devices is a micropower isolated flyback controller IC with integrated 65V/1.2A DMOS power 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 sets VOUT using a single external resistor. Designed for automotive-grade (-55°C to +150°C) isolated auxiliary power in telecom, industrial, and medical systems.
For engineers reviewing the LT8301MPS5#TRMPBF datasheet, LT8301MPS5#TRMPBF pinout, LT8301MPS5#TRMPBF application, or LT8301MPS5#TRMPBF equivalent, key selection criteria include its boundary/low-ripple burst mode operation, 100µA sleep-mode quiescent current, AEC-Q100 qualification, 5-lead TSOT-23 package, and no-opto isolated regulation architecture.
Technical Context
The LT8301MPS5#TRMPBF implements current-mode control with boundary conduction mode (BCM) at heavy loads and low-ripple Burst Mode® at light loads, enabling high efficiency across 6mA–1.15A output current range. Its flyback pulse sense circuit samples the isolated output voltage during zero-secondary-current events, feeding a sample-and-hold error amplifier referenced to a trimmed 1.0V internal reference.
Internal compensation, soft-start, EN/UVLO with 1.228V threshold and 2.5µA hysteresis current, and output short-circuit protection are integrated. The device enforces minimum on-time (170ns) and off-time (450ns) to ensure stable sampling and avoid leading-edge blanking issues, while clamping maximum switching frequency below 430kHz in discontinuous mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 42V - supports wide-input industrial and automotive battery rails without external pre-regulation. |
| Integrated Switch | 65V/1.2A DMOS - enables direct connection to 42V input with margin for leakage spikes; eliminates external MOSFET. |
| Quiescent Current | 100µA in Sleep Mode - sustains ultra-low standby power for always-on isolated housekeeping supplies. |
| Regulation Method | Primary-side flyback waveform sampling - removes opto-isolator and third winding, reducing BOM count and cost. |
| Output Power | Up to 6W - achievable with appropriate transformer turns ratio (e.g., 3:1) and layout; verified at VIN = 36V, IOUT = 1.15A. |
| Operating Temp Range | –55°C to +150°C - qualified per AEC-Q100 Grade MP, suitable for under-hood automotive and harsh-environment industrial use. |
| Package | 5-Lead TSOT-23 - compact footprint (2.9mm × 1.6mm) with θJA = 150°C/W; compatible with standard SMT reflow. |
Pinout & Package
LT8301MPS5#TRMPBF is housed in a 5-lead plastic TSOT-23 package (S5), with exposed pad not electrically connected. Thermal resistance θJA = 150°C/W. Pin 1 is EN/UVLO, Pin 2 is GND, Pin 3 is RFB, Pin 4 is SW, Pin 5 is VIN - top-view orientation matches standard TSOT-23 marking convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable and input undervoltage lockout input | Shuts down IC when pulled below 0.2V; 1.228V threshold enables precise VIN UVLO programming with resistor divider. |
| GND (Pin 2) | Power and signal ground reference | Must connect directly to local ground plane; serves as return path for internal regulators and feedback circuitry. |
| RFB (Pin 3) | External feedback resistor connection | Current source (100µA typ) flows through external RFB to SW; sets output voltage via VOUT = 100µA × RFB / NPS − VF. |
| SW (Pin 4) | Drain of internal 65V/1.2A DMOS switch | Carries high dv/dt flyback pulses; requires minimized trace area and careful layout to suppress EMI and voltage overshoot. |
| VIN (Pin 5) | Main input supply and feedback reference | Supplies internal circuitry and provides reference for RFB regulation; must be locally bypassed with ≥10µF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| No-opto isolated regulation | Eliminates opto-isolator and third winding - reduces component count, cost, and long-term drift from aging or temperature nonlinearity. |
| Boundary + low-ripple Burst Mode | Maintains >75% efficiency from 6mA to full load; Burst Mode limits output ripple to <50mVpp while holding IQ ≤ 350µA active. |
| Single-resistor VOUT programming | Output voltage set by one external RFB (e.g., 154kΩ for 5V @ 3:1 turns ratio); simplifies design and enables field-adjustable outputs. |
| Internal compensation & soft-start | Removes need for external compensation network and startup timing components - accelerates design cycle and improves reliability. |
| AEC-Q100 Grade MP qualification | Validated for –55°C to +150°C junction operation with overtemperature protection - meets automotive safety-critical auxiliary supply requirements. |
Applications
| Industrial PLC I/O Isolation | Automotive Body Control Module |
|---|---|
Use Scenario: Providing isolated 5V/0.5A auxiliary power to digital I/O modules in programmable logic controllers, where galvanic separation prevents ground-loop noise and fault propagation. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output without secondary-side feedback components. Use Value: Reduces bill-of-materials by eliminating optocouplers and third-winding transformers while maintaining ±5% output accuracy across –40°C to +85°C ambient. |
Use Scenario: Generating isolated 3.3V/0.3A housekeeping power for CAN transceivers and microcontrollers in body control units, operating from 6V–16V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Micropower isolated flyback controller with AEC-Q100 MP grade ensuring reliable start-up and regulation during 4.5V brown-out events. Use Value: Achieves 100µA sleep current to meet automotive ISO 16750-2 quiescent drain limits, and withstands 150°C junction temperature under hood conditions. |
| Medical Patient-Monitoring Sensors | Telecom Remote Radio Units |
Use Scenario: Delivering isolated 5V/0.4A power to analog front-end sensors in patient-connected devices requiring reinforced insulation per IEC 60601-1. IC Role / Device Role / Timing Role: Safety-certified isolated power controller enabling creepage/clearance compliance without opto-isolator aging concerns. Use Value: Supports 6W output with <0.5% minimum load requirement - ensures stable regulation even during sensor sleep states with µA-level current draw. |
Use Scenario: Supplying isolated 12V/0.2A bias to RF power amplifiers in outdoor small-cell base stations, operating from –40°C to +70°C ambient with 48V DC input. IC Role / Device Role / Timing Role: High-voltage flyback controller with 65V SW rating tolerating 42V nominal input plus transient surges per IEC 61000-4-5. Use Value: Enables compact 5-lead TSOT-23 solution replacing larger SOIC-8 controllers - reduces PCB area by >60% while maintaining 85% peak efficiency. |
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 third-winding sensing. | Better suited for >65V input or higher-power (>10W) isolated supplies where thermal management favors discrete FETs. | Select LT3748 when input exceeds 42V or when design requires adjustable current limit beyond 1.2A. |
| UCC28740DR | TI part with integrated 700V MOSFET; uses primary-side sensing but with different sampling algorithm; 6-pin SOIC package. | Targeted at universal AC-DC adapters (85–265VAC); lacks AEC-Q100 qualification and automotive temp range. | Choose UCC28740 for AC-powered consumer/industrial adapters; avoid for automotive or extended-temp DC-DC designs. |
Compared with LT3748EMSE#TRPBF and UCC28740DR, the LT8301MPS5#TRMPBF uniquely combines integrated 65V/1.2A switch, no-opto regulation, AEC-Q100 MP grade, and 5-lead TSOT-23 packaging - making it optimal for space-constrained, wide-input, automotive-qualified isolated auxiliary supplies under 6W.
Availability
LT8301MPS5#TRMPBF is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, medical patient monitors, and telecom remote radio units requiring stable component supply with guaranteed long-term availability and automotive-grade reliability.
Supply support for LT8301MPS5#TRMPBF 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and automotive systems.
The LT8301 product line delivers micropower isolated flyback controllers optimized for compact, no-opto auxiliary power in safety-critical and thermally demanding environments - targeting automotive, medical, and industrial isolation applications.
FAQ
What is the maximum output power achievable with LT8301MPS5#TRMPBF?
The LT8301MPS5#TRMPBF delivers up to 6W of isolated output power, validated across input voltages from 5V to 36V. At VIN = 36V, it supports up to 1.15A output current into a 5V rail using a 3:1 transformer. Power capability depends on transformer turns ratio, primary inductance, and layout; exceeding 6W risks violating the 65V SW pin absolute maximum rating due to reflected voltage plus leakage spikes.
Does LT8301MPS5#TRMPBF require an opto-isolator or third transformer winding?
No. The LT8301MPS5#TRMPBF uses primary-side flyback waveform sampling to regulate the isolated output voltage - eliminating both opto-isolators and third-winding feedback circuits. This architecture reduces component count, cost, and long-term drift while maintaining ±5% output accuracy across temperature and line variations.
What is the operating temperature range for LT8301MPS5#TRMPBF?
The LT8301MPS5#TRMPBF is rated for a junction temperature range of –55°C to +150°C and is qualified per AEC-Q100 Grade MP. This makes it suitable for under-hood automotive applications, industrial controls in unconditioned enclosures, and medical equipment requiring extended thermal robustness - unlike commercial-grade variants limited to 125°C.
How is output voltage programmed on LT8301MPS5#TRMPBF?
Output voltage is set using a single external resistor (RFB) connected between the RFB pin and the 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). For example, a 154kΩ RFB with a 3:1 turns ratio yields ~5V output.
What protection features are integrated into LT8301MPS5#TRMPBF?
The LT8301MPS5#TRMPBF integrates output short-circuit protection, overtemperature shutdown, accurate EN/UVLO with hysteresis, and internal current limiting (1.2A min). It also enforces minimum on-time (170ns) and off-time (450ns) to prevent instability during light-load Burst Mode operation and ensure reliable flyback pulse sampling.
LT8301MPS5#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LT8301MPS5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8301MPS5#TRMPBF 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#TRMPBF reliable?
The price and inventory of LT8301MPS5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8301MPS5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8301MPS5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8301MPS5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8301MPS5#TRMPBF?
LT8301MPS5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8301MPS5#TRMPBF 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#TRMPBF?
For technical support, including LT8301MPS5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8301MPS5#TRMPBF requirements.
6.How does Aetrix verify that LT8301MPS5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8301MPS5#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8301MPS5#TRMPBF?
All LT8301MPS5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8301MPS5#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LT8301MPS5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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