My Inquiry
My Account
Analog Devices Inc. LT8301ES5#TRPBF
- Part No.:
- LT8301ES5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT8301ES5#TRPBF.pdf
- Description:
- IC REG FLYBACK 1.2A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,116
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8301ES5#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 space-constrained industrial and automotive systems.
For engineers reviewing the LT8301ES5#TRPBF datasheet, LT8301ES5#TRPBF pinout, LT8301ES5#TRPBF application, or LT8301ES5#TRPBF equivalent, key selection considerations include its 5-lead TSOT-23 package, 100µA sleep-mode quiescent current, ±5% output regulation accuracy (board-to-board), 170ns minimum on-time, and AEC-Q100 qualification for automotive housekeeping rails.
Technical Context
The LT8301ES5#TRPBF implements primary-side sensing via flyback pulse amplitude detection on the SW pin, using a sample-and-hold error amplifier referenced to a trimmed 1.0V internal reference and 10kΩ internal RREF. Regulation relies on IRFB = 100µA flowing through an external RFB resistor tied between SW and RFB pins, with output voltage determined by VOUT ≈ (100µA × RFB)/NPS − VF.
It operates in boundary conduction mode (BCM) under heavy load (variable frequency, zero-current switching), transitions to discontinuous conduction mode (DCM) when internal oscillator clamps frequency ≤430kHz, and enters low-ripple Burst Mode® below ~0.5% full-load - maintaining <10mVpp output ripple while achieving >75% efficiency at 1mA load with VIN = 12V.
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 - eliminates external high-voltage switch; enables self-contained flyback design with no external MOSFET required. |
| Quiescent Current | 100µA in Sleep Mode - enables >10-year battery life in always-on isolated monitoring circuits. |
| Output Power | Up to 6W - achievable with optimized transformer (e.g., Würth 750313974, 3:1, 40µH) and VIN ≥8V. |
| Regulation Method | No opto-isolator or third winding - reduces BOM count, improves reliability, and avoids opto aging/nonlinearity issues. |
| Switching Modes | Boundary mode (heavy load), DCM (mid-load), low-ripple Burst Mode® (light load) - balances efficiency, EMI, and output ripple across full load range. |
| Temperature Range | –40°C to +125°C junction - qualified per AEC-Q100 Grade I, suitable for under-hood automotive auxiliary supplies. |
Pinout & Package
LT8301ES5#TRPBF is housed in a 5-lead ThinSOT™ (TSOT-23) package with θJA = 150°C/W, requiring minimal PCB area and compatible with standard SMT reflow profiles.
| 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 or direct enable control; pulls to 0.2V to enter 100µA sleep mode. |
| GND (Pin 2) | Power Ground Reference | Primary return path for internal regulators and feedback circuitry; must connect directly to local ground plane to minimize noise coupling into RFB and SW nodes. |
| RFB (Pin 3) | Feedback Current Input | Accepts 100µA regulation current from external RFB resistor; voltage sampled here determines output setpoint; sensitive node - minimize trace area and avoid routing near SW or VIN. |
| SW (Pin 4) | Switch Drain Node | Drain of integrated 65V DMOS switch; carries high dv/dt flyback pulses; requires short, low-inductance layout to suppress ringing and EMI. |
| VIN (Pin 5) | Main Input Supply | Supplies internal bias and references RFB feedback; must be bypassed locally with ≥1µF ceramic capacitor to stabilize regulation loop and reduce input ripple. |
Key Features
| Feature | Design Value |
|---|---|
| No opto-isolator or third winding required | Reduces component count by ≥3 parts, eliminates opto aging drift, and improves long-term regulation stability over temperature and lifetime. |
| Single-resistor output programming | VOUT set via one external RFB (e.g., 154kΩ for 5V with 3:1 transformer); simplifies design iteration and enables field-adjustable outputs. |
| Internal compensation & soft-start | Removes need for external compensation network and startup timing components - cuts bill-of-materials and speeds time-to-functional prototype. |
| Output short-circuit protection | Auto-recovery hiccup mode limits average power during sustained short - prevents thermal runaway without external current-limit circuitry. |
| Low-ripple Burst Mode® | Maintains <10mVpp output ripple at light loads while sustaining >75% efficiency - critical for noise-sensitive analog and sensor subsystems. |
Applications
| Industrial PLC I/O Isolation | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Providing isolated 5V/0.5A auxiliary power to digital I/O modules in programmable logic controllers, where galvanic isolation prevents ground-loop interference and meets IEC 61000-4 immunity requirements. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output without secondary-side feedback components; handles transient-heavy 24VDC industrial bus input. Use Value: Eliminates optocoupler and TL431-based feedback, reducing solution size by 35% and improving MTBF by removing opto aging failure mechanism. |
Use Scenario: Generating isolated 5V rail for CAN transceivers and microcontroller peripherals in body electronics, operating across –40°C to +125°C ambient with cold-crank (6V) and load-dump (42V) tolerance. IC Role / Device Role / Timing Role: AEC-Q100 qualified flyback controller delivering stable housekeeping power; uses boundary mode for high efficiency at 100–500mA loads and Burst Mode® for <1mA standby. Use Value: Achieves 100µA sleep IQ and ±5% output accuracy over temperature - enabling reliable CAN communication during vehicle sleep modes without wake-up current penalties. |
| Medical Patient Monitoring Sensors | Isolated Industrial Ethernet PHY Power |
|
Use Scenario: Supplying isolated 3.3V/0.3A power to analog front-end sensors in patient-worn monitors, where creepage/clearance requirements mandate reinforced isolation and low EMI. IC Role / Device Role / Timing Role: Micropower flyback controller with low-ripple Burst Mode® operation; samples output voltage during zero-secondary-current intervals to maintain tight regulation without secondary feedback. Use Value: Delivers <10mVpp output ripple at 1mA load - prevents noise coupling into low-level biopotential amplifiers and satisfies IEC 60601-1 EMC Class B limits. |
Use Scenario: Powering isolated 3.3V PHY circuitry in industrial Ethernet switches, where 1500VDC isolation and immunity to 2kV surge transients are required per IEEE 802.3 standards. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller driving custom 4:1 transformer; withstands 65V SW pin stress during 100ns/2kV surge events with proper snubbing. Use Value: Enables fully isolated 10/100BASE-TX PHY supply in <100mm² PCB area - meeting EN 61000-4-5 Level 3 surge immunity without external TVS or clamp diodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5155RUMT | Requires opto-isolator + TL431 for regulation; no primary-side sensing; 65V/2.5A FET; higher IQ (200µA active) | Needs secondary-side feedback components; larger solution size; better suited for higher-power (>10W) designs with tighter VOUT tolerance | Select LM5155RUMT only if secondary-side regulation and higher output current capability are mandatory; not drop-in for LT8301ES5#TRPBF's no-opto architecture. |
| UCC28711DR | Primary-side sensing flyback controller; 700V HV start-up; no integrated switch; requires external 600V MOSFET; 120µA IQ sleep | Supports universal AC input (85–265VAC); needs external HV start-up and MOSFET; larger BOM but wider input range | Choose UCC28711DR for AC/DC adapter-style isolated supplies; LT8301ES5#TRPBF is preferred for DC-input-only, ultra-compact, and automotive-grade designs. |
Compared with LM5155RUMT and UCC28711DR, the LT8301ES5#TRPBF delivers the smallest total solution size for DC-input isolated flyback applications due to its integrated 65V/1.2A switch and no-opto architecture - reducing component count by 4–6 parts while maintaining AEC-Q100 compliance and sub-10mVpp light-load ripple.
Availability
LT8301ES5#TRPBF is available at Aetrix Electronics and suitable for industrial PLC I/O isolation, automotive BCM housekeeping rails, medical sensor powering, isolated Ethernet PHY supplies, and other applications requiring stable component supply with guaranteed long-term availability.
Supply support for LT8301ES5#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, signal chain, and interface solutions.
The LT8301ES5#TRPBF belongs to Analog Devices' µModule®-adjacent isolated power controller family, designed specifically for compact, high-reliability DC-input isolated flyback supplies where opto-isolator elimination, ultra-low quiescent current, and AEC-Q100 qualification are critical.
FAQ
What is the maximum output power achievable with the LT8301ES5#TRPBF?
The LT8301ES5#TRPBF delivers up to 6W of isolated output power, contingent on input voltage, transformer turns ratio, and layout optimization. At VIN = 24V with a 3:1 transformer (e.g., Würth 750313974), it sustains 1.0A at 5V output. Peak power is limited by the 1.2A minimum switch current limit and 65V SW pin rating - exceeding either violates absolute maximum ratings.
How does the LT8301ES5#TRPBF regulate output voltage without an opto-isolator?
The LT8301ES5#TRPBF samples the reflected flyback voltage on the SW pin during zero-secondary-current intervals, converting it to a precise 100µA regulation current (IRFB) that flows through an external RFB resistor. This current, combined with the internal 10kΩ reference and 1.0V trimmed reference, sets VOUT = (100µA × RFB)/NPS − VF - eliminating need for opto-isolators or third windings.
What is the purpose of the RFB pin on the LT8301ES5#TRPBF?
The RFB pin on the LT8301ES5#TRPBF serves as the input node for the external feedback resistor that programs output voltage. It sinks a tightly regulated 100µA current (±2.5%) from the SW pin; the voltage developed across RFB relative to the internal 10kΩ reference determines regulation setpoint - making RFB the sole external component defining VOUT.
Does the LT8301ES5#TRPBF support AEC-Q100 qualification?
Yes, the LT8301ES5#TRPBF is AEC-Q100 qualified for automotive applications (Grade I, –40°C to +125°C junction temperature). Its datasheet specifies guaranteed performance across this range, including EN/UVLO thresholds, switching frequency, and current limit - making it suitable for automotive body control, infotainment, and ADAS auxiliary power rails.
What transformer parameters are critical when designing with the LT8301ES5#TRPBF?
Critical transformer parameters for the LT8301ES5#TRPBF include primary inductance ≥40µH (to meet 450ns minimum off-time), leakage inductance <1µH (to limit SW voltage spikes), turns ratio accuracy within ±1%, and saturation current >1.5× peak switch current. Pre-qualified parts like Würth 750313974 (3:1, 40µH) or Sumida 12387-T037 (3:1, 40µH) are validated for optimal performance.
LT8301ES5#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT8301ES5#TRPBF FAQ
1.How can I place an order for LT8301ES5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8301ES5#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 LT8301ES5#TRPBF reliable?
The price and inventory of LT8301ES5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8301ES5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8301ES5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8301ES5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8301ES5#TRPBF?
LT8301ES5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8301ES5#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 LT8301ES5#TRPBF?
For technical support, including LT8301ES5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8301ES5#TRPBF requirements.
6.How does Aetrix verify that LT8301ES5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8301ES5#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 LT8301ES5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8301ES5#TRPBF?
All LT8301ES5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8301ES5#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 LT8301ES5#TRPBF part is unused and in its original packaging.
Return procedure for LT8301ES5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8301ES5#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
