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Analog Devices Inc. LT8300IS5#WTRMPBF
- Part No.:
- LT8300IS5#WTRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT8300IS5#WTRMPBF.pdf
- Description:
- IC REG FLYBACK 260MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,247
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Product details
Overview
LT8300IS5#WTRMPBF from Analog Devices is a micropower isolated flyback controller IC with integrated 150V/260mA DMOS switch, operating from 6V to 100V input and delivering up to 2W isolated output power. It regulates output voltage via primary-side 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 LT8300IS5#WTRMPBF datasheet, LT8300IS5#WTRMPBF pinout, LT8300IS5#WTRMPBF application, or LT8300IS5#WTRMPBF equivalent, key selection considerations include its 5-lead TSOT-23 package, 70µA sleep-mode quiescent current, 150V SW pin rating, ±5% output regulation accuracy, and compatibility with standard flyback transformers rated for 1.5kV isolation.
Technical Context
The LT8300IS5#WTRMPBF implements primary-side sensing using flyback pulse amplitude on the SW pin, enabling regulation without secondary feedback components. Its sample-and-hold error amplifier captures voltage when secondary current reaches zero-ensuring accurate sampling in boundary and discontinuous conduction modes.
It integrates internal compensation, soft-start (2.7ms), and dual-mode control: boundary mode at heavy loads (variable frequency, peak-current limited) and low-ripple Burst Mode® at light loads (minimum 7.5kHz switching frequency, 70µA IQ). The EN/UVLO pin provides programmable undervoltage lockout with 1.223V threshold and 2.5µA hysteresis current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 100V - supports wide-input industrial and automotive battery rails including 24V, 36V, 48V, and 72V systems. |
| Integrated Switch | 150V/260mA DMOS - eliminates external high-voltage switch; enables compact isolated supply designs up to 2W output. |
| Quiescent Current | 70µA in Sleep Mode - minimizes standby power loss in always-on automotive housekeeping supplies. |
| Output Regulation | Set by single RFB resistor - simplifies design and reduces BOM count; typical ±5% board-to-board accuracy with matched transformer. |
| Switching Modes | Boundary mode (heavy load) + Low-ripple Burst Mode® (light load) - maintains >85% efficiency across 1mA–300mA load range. |
| AEC-Q100 Grade | Grade I (–40°C to +125°C) - qualified for automotive under-hood and infotainment auxiliary power applications. |
| Package | 5-Lead TSOT-23 - surface-mount, thermally enhanced package with 150°C max junction temperature and θJA = 150°C/W. |
Pinout & Package
LT8300IS5#WTRMPBF is housed in a 5-lead plastic TSOT-23 package (S5), with exposed pad for thermal performance. Pin 1 is EN/UVLO, Pin 2 is GND, Pin 3 is RFB, Pin 4 is SW (drain of internal DMOS), and Pin 5 is VIN. The package is RoHS-compliant, lead-free, and tape-and-reel packaged with 500-unit mini reels (#WTRMPBF suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable and input undervoltage lockout input | Shuts down device below 0.3V; 1.223V 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) | Feedback current input for output voltage setting | Accepts 100µA regulation current; RFB value determines VOUT per VOUT = (100µA × RFB)/NPS − VF. |
| SW (Pin 4) | Drain of internal 150V/260mA DMOS switch | Connects to transformer primary; requires minimized trace area to suppress EMI and voltage spikes from leakage inductance. |
| VIN (Pin 5) | Main input supply and feedback reference | Supplies internal circuitry; must be locally bypassed to GND with ceramic capacitor; sets reference for RFB feedback loop. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation | Eliminates opto-isolator and third winding - reduces component count, cost, and layout complexity while improving reliability over lifetime. |
| Boundary + Burst Mode operation | Maintains >85% efficiency from 1mA to full load - avoids subharmonic oscillation and enables stable, low-noise output even at ultra-light loads. |
| Internal compensation & soft-start | Reduces external parts to only RFB, transformer, input/output caps, and diode - accelerates design cycle and improves consistency across production units. |
| Low minimum load requirement | <0.5% of full output - supports partial-load operation in systems with variable downstream power demand (e.g., sensor wake-up states). |
| AEC-Q100 automotive qualification | Validated for Grade I temperature range (–40°C to +125°C) - meets functional safety requirements for automotive auxiliary/housekeeping power domains. |
Applications
| Automotive Auxiliary Power | Industrial Isolated Bias Supply |
|---|---|
Use Scenario: Providing isolated 5V/300mA housekeeping power for ADAS camera modules powered from 12V–48V vehicle battery. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output without secondary feedback components. Use Value: Enables compact, AEC-Q100-compliant power solution with <70µA sleep current-extending battery life during vehicle off-state. |
Use Scenario: Generating isolated 12V/100mA bias for PLC I/O channel isolators in 24V factory automation systems. IC Role / Device Role / Timing Role: Micropower flyback controller delivering stable output across 6V–100V input transients common in industrial 24V rails. Use Value: Achieves ±5% output regulation without optocouplers-reducing long-term drift and calibration burden in field-deployed equipment. |
| Medical Sensor Isolation | Telecom Remote Power |
Use Scenario: Supplying isolated 3.3V/200mA to patient-connected biosensor front-ends requiring 1.5kV reinforced isolation. IC Role / Device Role / Timing Role: Isolated flyback controller supporting transformer-based galvanic isolation compliant with IEC 60601-1 creepage/clearance requirements. Use Value: Delivers certified isolation margin using off-the-shelf Wurth or Sumida pre-designed transformers-accelerating medical regulatory approval. |
Use Scenario: Powering remote Ethernet PHYs or PoE-powered devices from centralized 48V telecom DC distribution. IC Role / Device Role / Timing Role: High-input flyback controller converting 36V–72V telecom supply to isolated 5V/250mA for data interface circuitry. Use Value: Supports burst-mode operation down to 1mA load-maintaining low ripple and high efficiency during idle link states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3748EMS#PBF | Requires external MOSFET; no integrated switch; supports higher output power (>5W); lacks Burst Mode® | Better suited for >3W isolated supplies where thermal headroom allows discrete FET use | Select LT3748EMS#PBF when higher power or custom switch optimization is required; not drop-in for LT8300IS5#WTRMPBF. |
| UCC28740DR | TI part with integrated 700V FET; fixed 65kHz frequency; no boundary mode; higher IQ (220µA active) | Targets universal AC input (85–265VAC) rather than DC-DC isolated conversion | Choose UCC28740DR for AC/DC adapter designs; LT8300IS5#WTRMPBF is preferred for DC-input automotive/industrial systems. |
Compared with LT3748EMS#PBF and UCC28740DR, the LT8300IS5#WTRMPBF uniquely combines integrated 150V/260mA switching, primary-side regulation, AEC-Q100 qualification, and ultra-low 70µA sleep current-making it optimal for space-constrained, low-power DC-fed isolated supplies where reliability and minimal BOM are critical.
Availability
LT8300IS5#WTRMPBF is available at Aetrix Electronics and suitable for automotive auxiliary power, industrial isolated bias supplies, and medical sensor isolation requiring stable component supply with controlled manufacturing and extended temperature support.
Supply support for LT8300IS5#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 is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision, industrial, automotive, and communications markets.
The LT8300 product line delivers micropower isolated flyback controllers optimized for DC-input systems requiring compact, reliable, and AEC-Q100-qualified auxiliary power-targeting automotive, industrial, and medical applications where galvanic isolation and low standby power are essential.
FAQ
What is the maximum output power achievable with LT8300IS5#WTRMPBF?
The LT8300IS5#WTRMPBF delivers up to 2W of isolated output power, depending on input voltage, transformer turns ratio, and output voltage. For example, with a 6:1 transformer and 36V–72V input, it achieves 1.87W at 36V and 2.44W at 72V into a 5V output. Power is constrained by the 260mA switch current limit and 150V SW pin rating-exceeding either violates absolute maximum ratings.
Does LT8300IS5#WTRMPBF require an opto-isolator or third winding for regulation?
No. The LT8300IS5#WTRMPBF uses primary-side flyback pulse sampling on the SW pin to regulate output voltage-eliminating the need for opto-isolators, third windings, or secondary-side feedback components. This architecture reduces BOM count, improves reliability, and avoids optocoupler aging and nonlinearity issues inherent in traditional isolated supplies.
What is the function of the RFB pin on LT8300IS5#WTRMPBF?
The RFB pin on LT8300IS5#WTRMPBF accepts a 100µA regulation current that flows through an external resistor to set the output voltage. 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. This single-resistor method replaces complex feedback networks.
Is LT8300IS5#WTRMPBF suitable for automotive applications?
Yes. The LT8300IS5#WTRMPBF is AEC-Q100 qualified (Grade I, –40°C to +125°C) and designated with the #W automotive suffix. It supports functional safety at the system level and is designed for automotive auxiliary/housekeeping power in ADAS, infotainment, and body electronics-meeting stringent reliability and temperature requirements.
How does LT8300IS5#WTRMPBF manage light-load efficiency?
The LT8300IS5#WTRMPBF employs low-ripple Burst Mode® operation at light loads, alternating between active switching cycles and sleep mode to reduce effective quiescent current to 70µA. Unlike conventional burst modes, it maintains tight output voltage ripple (<20mVpp) and avoids audible noise-critical for sensitive analog and sensor circuits.
LT8300IS5#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):
- 6V
- Voltage - Input (Max):
- 100V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- 150V (Switch)
- Current - Output:
- 260mA (Switch)
- Frequency - Switching:
- 7.5kHz ~ 750kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT8300IS5#WTRMPBF FAQ
1.How can I place an order for LT8300IS5#WTRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8300IS5#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 LT8300IS5#WTRMPBF reliable?
The price and inventory of LT8300IS5#WTRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8300IS5#WTRMPBF is usually 5 days.
3.What payment methods are accepted for LT8300IS5#WTRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8300IS5#WTRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8300IS5#WTRMPBF?
LT8300IS5#WTRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8300IS5#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 LT8300IS5#WTRMPBF?
For technical support, including LT8300IS5#WTRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8300IS5#WTRMPBF requirements.
6.How does Aetrix verify that LT8300IS5#WTRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8300IS5#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 LT8300IS5#WTRMPBF meets industry standards.
7.What is the process for return or replacement of LT8300IS5#WTRMPBF?
All LT8300IS5#WTRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8300IS5#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 LT8300IS5#WTRMPBF part is unused and in its original packaging.
Return procedure for LT8300IS5#WTRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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