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Analog Devices Inc. LT8301HS5#TRPBF
- Part No.:
- LT8301HS5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT8301HS5#TRPBF.pdf
- Description:
- IC REG FLYBACK 1.2A TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,593
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Product details
Overview
LT8301HS5#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 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-grade applications, it features boundary mode at heavy load, low-ripple Burst Mode® at light load, and AEC-Q100 qualification (–40°C to 150°C).
For engineers reviewing the LT8301HS5#TRPBF datasheet, LT8301HS5#TRPBF pinout, LT8301HS5#TRPBF application, or LT8301HS5#TRPBF equivalent, key selection considerations include its no-opto isolated regulation architecture, 100µA sleep-mode quiescent current, 5-lead TSOT-23 package, internal compensation, and EN/UVLO threshold accuracy (1.228V ±24mV) for reliable startup control in harsh environments.
Technical Context
The LT8301HS5#TRPBF implements current-mode control with boundary conduction mode (BCM) at heavy loads and transitions to discontinuous conduction mode (DCM) when switching frequency reaches ~430kHz, preventing excessive gate charge losses. Its flyback pulse sense circuit samples the reflected output voltage on the SW pin precisely when secondary current reaches zero, enabling accurate regulation without secondary-side feedback components.
It integrates a sample-and-hold error amplifier referenced to a trimmed 1.0V internal reference, a boundary mode detector, soft-start, and overtemperature protection. The RFB pin draws a tightly regulated 100µA (±2.5µA) current, establishing VOUT = (100µA × RFB)/NPS − VF, where NPS is the transformer turns ratio and VF is diode forward voltage-making output setting deterministic yet layout-sensitive.
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 (≥2.7V) and load-dump transient tolerance. |
| Integrated Switch | 65V/1.2A DMOS - enables direct use with ≤42V input while maintaining 15V margin against leakage spikes; RDS(ON) = 0.4Ω ensures low conduction loss. |
| Quiescent Current | 100µA (sleep), 350µA (active) - enables micropower operation in always-on auxiliary supplies without compromising efficiency. |
| Output Regulation | VOUT set by single RFB resistor - eliminates opto-isolator, third winding, and associated aging/drift; accuracy depends on RFB tolerance and transformer NPS matching (±1%). |
| Switching Modes | Boundary mode (heavy load), DCM (mid-load), low-ripple Burst Mode® (light load) - maintains >75% efficiency down to 0.5% full load while minimizing output ripple. |
| Operating Temp Range | –40°C to +150°C junction - qualified per AEC-Q100 Grade H, suitable for under-hood and high-ambient industrial environments. |
| EN/UVLO Threshold | 1.228V ±24mV with 2.5µA hysteresis - allows precise VIN undervoltage lockout programming using resistor divider; ensures robust startup sequencing. |
Pinout & Package
LT8301HS5#TRPBF is housed in a 5-lead ThinSOT™ (TSOT-23) plastic package with θJA = 150°C/W, optimized for compact isolated DC/DC designs requiring minimal board area and thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable and VIN undervoltage lockout input | Pull below 0.2V to shut down; 1.228V threshold enables accurate UVLO programming with resistor divider; 2.5µA hysteresis sets hysteresis voltage. |
| 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 | Sinks precise 100µA current; RFB value determines output voltage per VOUT = (100µA × RFB)/NPS − VF; sensitive to trace capacitance. |
| 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 prevent voltage overshoot beyond 65V. |
| VIN (Pin 5) | Main input supply and reference | Supplies internal circuitry and serves as 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-reducing BOM count, cost, size, and long-term drift; relies on accurate flyback pulse sampling at zero secondary current. |
| Boundary & Burst Mode operation | Enables high efficiency (>85%) across full load range: BCM minimizes transformer size and improves load regulation; low-ripple Burst Mode® maintains <15mVpp ripple at light load. |
| Internal compensation & soft-start | Reduces external component count by integrating loop compensation and soft-start timing-simplifying design and improving startup reliability into capacitive loads. |
| Output short-circuit protection | Provides hiccup-mode or current-limit foldback during sustained short circuits-preventing thermal runaway and enabling safe auto-recovery after fault removal. |
| AEC-Q100 Grade H qualification | Validated for automotive applications with guaranteed operation from –40°C to +150°C junction temperature and robust stress testing per AEC-Q100 Rev H. |
Applications
| Automotive Body Control Module (BCM) Auxiliary Supply | Industrial PLC Isolated I/O Power |
|---|---|
Use Scenario: Providing isolated 5V/0.55A housekeeping power to microcontrollers and CAN transceivers in vehicle body control units exposed to 12V battery with cold-crank (≤6V) and load-dump (≤42V) transients. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output without secondary feedback; samples flyback pulse on SW pin at zero-crossing for precise VOUT control. Use Value: Enables compact, AEC-Q100-compliant 5V supply with <100µA quiescent current-extending battery life in always-on modules while eliminating opto-isolator aging and calibration drift. |
Use Scenario: Generating isolated 24V/0.12A auxiliary power for analog input/output channels in programmable logic controllers operating in 0–60°C ambient with 24V DC field bus input. IC Role / Device Role / Timing Role: Micropower isolated flyback controller implementing boundary mode for stable regulation across wide line/load variations; uses RFB resistor for fixed 24V output. Use Value: Delivers high-efficiency isolation with no opto-isolator-reducing long-term calibration drift and failure risk in safety-critical industrial automation systems. |
| Medical Patient Monitoring Auxiliary Power | Telecom Remote Radio Unit (RRU) Bias Supply |
Use Scenario: Supplying isolated 3.3V/0.8A power to low-noise ADCs and isolated communication interfaces in portable patient monitors requiring reinforced insulation and low EMI. IC Role / Device Role / Timing Role: No-opto flyback controller operating in low-ripple Burst Mode® to minimize conducted emissions; samples SW node during flyback for accurate 3.3V regulation. Use Value: Achieves <15mVpp output ripple and <100µA sleep current-meeting stringent EMC and battery runtime requirements without opto-isolator nonlinearities. |
Use Scenario: Delivering isolated 48V/50mA bias power to GaN power amplifiers in outdoor 5G remote radio units powered from 48V DC plant supply with wide temperature swing (–40°C to +85°C). IC Role / Device Role / Timing Role: High-voltage flyback controller using 1:4 transformer turns ratio to generate 48V from 32V input while keeping SW pin voltage <65V; operates in boundary mode for tight regulation. Use Value: Supports high-ratio step-up with integrated 65V switch-enabling compact, efficient, and thermally robust bias supply without external HV MOSFET or optocoupler. |
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 HV MOSFET; no integrated switch; supports up to 100V input; includes synchronous rectification drive. | Better suited for >42V input or higher-power (>10W) isolated supplies; lacks micropower sleep mode (IQ = 1.1mA). | Select LT3748 when input exceeds 42V or synchronous rectification is required; avoid for space-constrained, ultra-low-IQ designs. |
| UCC28740DR | TI part with integrated 700V MOSFET; uses valley-switching quasi-resonant control; IQ = 250µA (no sub-100µA sleep mode). | Targeted at AC/DC offline flyback (85–265VAC); not rated for automotive temp grade; lacks AEC-Q100 qualification. | Choose UCC28740 for universal AC input; LT8301HS5#TRPBF remains preferred for DC-input automotive/industrial isolation with tighter temp range and lower IQ. |
Compared with LT3748EMSE#TRPBF and UCC28740DR, the LT8301HS5#TRPBF uniquely combines integrated 65V/1.2A switch, 100µA sleep current, AEC-Q100 Grade H rating, and no-opto regulation in a 5-lead TSOT-23-making it optimal for compact, low-power, high-reliability DC-fed isolated supplies where board space and quiescent power are critical.
Availability
LT8301HS5#TRPBF is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O isolation, medical auxiliary power, and telecom RRU bias supplies requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for LT8301HS5#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 industrial, automotive, communications, and healthcare markets with precision power, signal chain, and RF solutions.
The LT8301 product line delivers micropower isolated flyback controllers for space-constrained, low-quiescent-power applications-designed specifically to eliminate opto-isolators and simplify isolated DC/DC design in automotive, industrial, and medical systems.
FAQ
What is the maximum output power achievable with the LT8301HS5#TRPBF?
The LT8301HS5#TRPBF can deliver up to 6W of isolated output power, depending on input voltage, transformer turns ratio, and output voltage. For example, with VIN = 36V and a 3:1 transformer, it supports 5V/1.15A (5.75W); with VIN = 24V and same ratio, it delivers 5V/1.0A (5W). Power is limited by the 1.2A minimum switch current limit and 65V SW pin rating-exceeding either violates absolute maximum ratings.
Does the LT8301HS5#TRPBF require an opto-isolator or third winding for regulation?
No, the LT8301HS5#TRPBF does not require an opto-isolator or third winding. It achieves precise isolated output regulation by sampling the reflected flyback voltage directly on the SW pin when secondary current reaches zero-leveraging internal circuitry including a flyback pulse sense circuit and sample-and-hold error amplifier. This architecture reduces component count, cost, and long-term drift.
How is the output voltage programmed on the LT8301HS5#TRPBF?
The output voltage of the LT8301HS5#TRPBF is set using a single external resistor (RFB) connected between the RFB pin and the SW pin. The device sinks a precise 100µA current through RFB, and VOUT ≈ (100µA × RFB)/NPS − VF, where NPS is the transformer primary-to-secondary turns ratio and VF is the output diode forward voltage. Final RFB value requires empirical adjustment based on measured VOUT.
What are the key differences between the LT8301HS5#TRPBF and the LT8301IS5#TRPBF?
The LT8301HS5#TRPBF is qualified for operation from –40°C to +150°C junction temperature and meets AEC-Q100 Grade H requirements, whereas the LT8301IS5#TRPBF is rated for –40°C to +125°C and is not AEC-Q100 qualified. Both share identical electrical specifications, pinout, and functionality-but only the H-grade version is approved for under-hood automotive applications.
Can the LT8301HS5#TRPBF operate with input voltages below 2.7V?
No, the LT8301HS5#TRPBF has a specified minimum input voltage of 2.7V per its Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.7V may result in improper startup, unstable regulation, or failure to engage the internal regulators. For sub-2.7V applications, alternative solutions such as boost-assisted flyback or dedicated low-VIN controllers should be considered.
LT8301HS5#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT8301HS5#TRPBF FAQ
1.How can I place an order for LT8301HS5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8301HS5#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 LT8301HS5#TRPBF reliable?
The price and inventory of LT8301HS5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8301HS5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8301HS5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8301HS5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8301HS5#TRPBF?
LT8301HS5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8301HS5#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 LT8301HS5#TRPBF?
For technical support, including LT8301HS5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8301HS5#TRPBF requirements.
6.How does Aetrix verify that LT8301HS5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8301HS5#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 LT8301HS5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8301HS5#TRPBF?
All LT8301HS5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8301HS5#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 LT8301HS5#TRPBF part is unused and in its original packaging.
Return procedure for LT8301HS5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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