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Analog Devices Inc. LT8300IS5#WTRPBF
- Part No.:
- LT8300IS5#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT8300IS5#WTRPBF.pdf
- Description:
- IC REG FLYBACK 260MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,480
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Product details
Overview
LT8300IS5#WTRPBF 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 in boundary or low-ripple Burst Mode. 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, 70µA sleep-mode quiescent current, and 5-lead TSOT-23 packaging.
For engineers reviewing the LT8300IS5#WTRPBF datasheet, LT8300IS5#WTRPBF pinout, LT8300IS5#WTRPBF application, or LT8300IS5#WTRPBF equivalent, key selection criteria include input voltage range (6–100V), internal switch rating (150V/260mA), boundary mode operation for high load regulation, low-ripple Burst Mode efficiency at light loads, and automotive-grade temperature range (–40°C to 125°C).
Technical Context
The LT8300IS5#WTRPBF implements primary-side sensing using flyback pulse amplitude on the SW pin to derive isolated output voltage without opto-isolators or auxiliary windings. Its sample-and-hold error amplifier samples only when secondary current reaches zero-ensuring accurate regulation across load conditions.
It operates in three distinct modes: boundary conduction mode (variable frequency, zero-current switching) at heavy loads; discontinuous conduction mode with frequency clamping (<750kHz) as load decreases; and low-ripple Burst Mode with 7.5kHz minimum switching frequency and 70µA sleep current at ultra-light loads-enabling <0.5% minimum load requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 100V - supports wide-range industrial and automotive battery inputs including 12V, 24V, 36V, 48V, and 72V nominal systems. |
| Integrated Switch | 150V/260mA DMOS - enables direct high-voltage primary-side switching without external MOSFET; 10Ω RDS(ON) at 100mA reduces conduction loss. |
| Quiescent Current | 70µA in Sleep Mode - minimizes standby power draw in always-on automotive housekeeping supplies. |
| Switching Frequency | 6–780kHz variable - boundary mode adapts frequency to load; internal clamp prevents >750kHz operation to limit gate charge losses. |
| Output Regulation | VOUT set by single RFB resistor - eliminates opto-isolator and third winding; 100µA RFB regulation current enables precise 3.3V–24V outputs. |
| Temperature Range | –40°C to +125°C junction - AEC-Q100 qualified for automotive under-hood and infotainment auxiliary power applications. |
| Package | 5-Lead TSOT-23 - compact footprint (2.9mm × 1.6mm) suitable for space-constrained isolated DC/DC modules. |
Pinout & Package
LT8300IS5#WTRPBF 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 150V DMOS), and Pin 5 is VIN. The package supports reflow soldering per JEDEC J-STD-020 and has θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable and undervoltage lockout input | 1.223V threshold with 2.5µA hysteresis; allows programmable VIN UVLO using resistor divider; shutdown draws only 70µA. |
| GND (Pin 2) | Power and signal reference ground | Must connect directly to local ground plane; serves as return path for internal regulators and feedback circuitry. |
| RFB (Pin 3) | Feedback current input | Accepts 100µA regulation current; voltage across external RFB sets output via VOUT ≈ 100µA × RFB / NPS − VF (diode drop). |
| SW (Pin 4) | Drain of internal 150V DMOS switch | Carries primary-side flyback current; voltage swing reaches VIN + VOUT×NPS; requires minimized trace area to suppress EMI and leakage spikes. |
| VIN (Pin 5) | Main input supply and reference | Supplies internal circuitry and provides reference for RFB feedback; must be locally bypassed with ≥1µF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation | Eliminates opto-isolator and third winding-reducing BOM count, cost, and transformer complexity while improving long-term reliability. |
| Boundary conduction mode | Zero-current switching ensures excellent load regulation without external compensation and enables smaller magnetics than CCM. |
| Low-ripple Burst Mode | Maintains <15mVpp output ripple at light loads while achieving >80% efficiency at 1mA output-critical for noise-sensitive analog circuits. |
| Internal compensation & soft-start | Reduces external components to just RFB, transformer, input/output caps, and diode; 2.7ms soft-start prevents inrush current stress. |
| AEC-Q100 Grade I qualification | Validated for automotive use across –40°C to +125°C; supports functional safety requirements in ASIL-B auxiliary power designs. |
Applications
| Automotive Auxiliary Power | Industrial Isolated Bias Supply |
|---|---|
Use Scenario: Providing isolated 5V/300mA housekeeping power for ADAS camera modules powered from 12V or 24V vehicle battery with cold-crank (6V) and load-dump (100V) transients. IC Role / Device Role / Timing Role: Primary-side flyback controller regulating isolated output without opto-isolator; manages boundary-to-Burst Mode transition across 1mA–300mA load range. Use Value: Enables compact, AEC-Q100-compliant 5V rail with <0.5% minimum load support and 70µA sleep current-extending battery life during vehicle off-state. |
Use Scenario: Generating isolated ±12V bias for industrial PLC I/O modules requiring galvanic separation between field-side and controller-side circuitry. IC Role / Device Role / Timing Role: Flyback controller driving center-tapped transformer to produce dual-rail output; uses RFB resistor and turns ratio to set symmetric rails. Use Value: Delivers stable ±12V at up to 67mA per rail from 48V input with no optocoupler drift or aging-improving long-term calibration stability. |
| Medical Sensor Isolation | Telecom Interface Power |
Use Scenario: Powering isolated front-end amplifiers and ADCs in portable patient monitors where creepage/clearance and low EMI are critical. IC Role / Device Role / Timing Role: Micropower flyback controller operating in low-ripple Burst Mode to minimize conducted emissions into sensitive analog signal paths. Use Value: Achieves <15mVpp output ripple and 70µA quiescent current-preserving SNR in 24-bit medical data acquisition systems. |
Use Scenario: Supplying isolated 3.3V/500mA power to Ethernet PHYs and PoE interface controllers in telecom edge equipment with 36–72V input range. IC Role / Device Role / Timing Role: High-input-voltage flyback controller supporting 48V telecom standard; delivers regulated output using 6:1 transformer and single RFB. Use Value: Supports full 2W output at 72V input with 85% typical efficiency-meeting EN55022 Class B emission limits without added filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3748IMS#PBF | Requires opto-isolator feedback; no primary-side sensing; higher IQ (120µA sleep); supports up to 100V input but lacks AEC-Q100 grade. | Used where opto feedback is acceptable and automotive qualification is not required; better for high-precision regulation with external loop compensation. | Select LT3748IMS#PBF if system-level opto-isolation is already present and tighter output tolerance (<±1%) is needed over temperature. |
| UCC28740DR | TI part with primary-side sensing; 90V max input; 180mA/700V switch; no AEC-Q100; 105µA active IQ; requires external compensation. | Targeted at consumer AC/DC adapters; lacks automotive temp range and 100V input capability; lower integration (no internal soft-start). | Choose UCC28740DR only for cost-sensitive non-automotive applications below 90V input where 700V switch voltage margin is essential. |
Compared with LT3748IMS#PBF and UCC28740DR, the LT8300IS5#WTRPBF uniquely combines 100V input, AEC-Q100 qualification, 70µA sleep current, and true opto-free primary-side regulation in a 5-lead TSOT-23-making it the only drop-in solution for space-constrained automotive auxiliary supplies requiring <2W isolation.
Availability
LT8300IS5#WTRPBF is available at Aetrix Electronics and suitable for automotive auxiliary power, industrial isolated bias, medical sensor isolation, and telecom interface power applications requiring stable component supply, AEC-Q100 compliance, and minimal external component count.
Supply support for LT8300IS5#WTRPBF 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 timing solutions.
The LT8300 product line delivers micropower isolated flyback controllers optimized for space- and efficiency-critical auxiliary power in automotive and industrial systems-designed to eliminate opto-isolators while maintaining tight regulation and ultra-low quiescent current.
FAQ
What is the maximum output power achievable with the LT8300IS5#WTRPBF?
The LT8300IS5#WTRPBF delivers up to 2W of isolated output power depending on input voltage, transformer turns ratio, and output voltage. At 48V input and 5V output with a 6:1 transformer, typical output is 2.44W at 72V input dropping to 1.87W at 36V input. Maximum power is constrained by the 150V SW pin rating and 260mA switch current limit-designs must ensure reflected voltage plus leakage spike remains below 150V.
Does the LT8300IS5#WTRPBF require an opto-isolator or third winding for regulation?
No, the LT8300IS5#WTRPBF does not require an opto-isolator or third winding. It achieves regulation by sampling the isolated output voltage directly from the primary-side flyback waveform on the SW pin. This primary-side sensing architecture eliminates opto-isolator aging, nonlinearity, and layout complexity while reducing BOM count and transformer size.
How is the output voltage programmed on the LT8300IS5#WTRPBF?
The output voltage of the LT8300IS5#WTRPBF is programmed using a single external resistor (RFB) connected between the RFB pin and the SW node. With a nominal RFB regulation current of 100µA and internal 12.23kΩ reference, 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).
What are the key differences between the LT8300IS5#WTRPBF and the commercial-grade LT8300ES5#TRPBF?
The LT8300IS5#WTRPBF is the automotive-grade variant with AEC-Q100 qualification, specified for –40°C to +125°C junction temperature, and shipped in tape-and-reel with #W suffix for controlled manufacturing. The LT8300ES5#TRPBF is commercial-grade (–40°C to +125°C, non-AEC-Q100), lacks automotive reliability reporting, and uses standard packaging-making the LT8300IS5#WTRPBF mandatory for automotive production designs.
Can the LT8300IS5#WTRPBF operate efficiently at very light loads?
Yes, the LT8300IS5#WTRPBF maintains high efficiency at light loads using low-ripple Burst Mode operation, with a typical minimum switching frequency of 7.5kHz and sleep-mode quiescent current of 70µA. This enables operation down to <0.5% of full-load current while keeping output voltage ripple below 15mVpp-ideal for always-on automotive modules.
LT8300IS5#WTRPBF 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#WTRPBF FAQ
1.How can I place an order for LT8300IS5#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8300IS5#WTRPBF 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#WTRPBF reliable?
The price and inventory of LT8300IS5#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8300IS5#WTRPBF is usually 5 days.
3.What payment methods are accepted for LT8300IS5#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8300IS5#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8300IS5#WTRPBF?
LT8300IS5#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8300IS5#WTRPBF 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#WTRPBF?
For technical support, including LT8300IS5#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8300IS5#WTRPBF requirements.
6.How does Aetrix verify that LT8300IS5#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LT8300IS5#WTRPBF 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#WTRPBF meets industry standards.
7.What is the process for return or replacement of LT8300IS5#WTRPBF?
All LT8300IS5#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8300IS5#WTRPBF, 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#WTRPBF part is unused and in its original packaging.
Return procedure for LT8300IS5#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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