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Analog Devices Inc. LT8302MPS8E#PBF
- Part No.:
- LT8302MPS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
LT8302MPS8E#PBF.pdf
- Description:
- IC REG FLYBACK 3.6A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:861
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Product details
Overview
LT8302MPS8E#PBF from Analog Devices is a monolithic micropower isolated flyback converter IC with integrated 65V/3.6A DMOS switch, operating from 3V to 42V input and delivering up to 18W isolated output power. It uses primary-side sensing without opto-isolator or third winding, supports boundary mode for high efficiency at heavy load and low-ripple Burst Mode® at light load, and targets automotive auxiliary power supplies requiring AEC-Q100 compliance and extended temperature operation.
For engineers reviewing the LT8302MPS8E#PBF datasheet, LT8302MPS8E#PBF pinout, LT8302MPS8E#PBF application, or LT8302MPS8E#PBF equivalent, key selection considerations include its –55°C to 150°C junction temperature range, 106µA sleep-mode quiescent current, 3.6A switch current limit, quasi-resonant boundary mode operation, and temperature-compensated output voltage programming via RFB/RREF/TC resistors.
Technical Context
The LT8302MPS8E#PBF implements primary-side regulation by sampling the flyback pulse on the SW pin during zero secondary current, eliminating need for opto-isolators or auxiliary windings. Its boundary conduction mode detector triggers switching at the valley of the SW node ringing, enabling quasi-resonant turn-on and minimizing switching losses.
It integrates internal compensation, soft-start, EN/UVLO with 1.214V enable threshold and 14mV hysteresis, and a PTAT TC pin (1V at 25°C, 3.35mV/K) for output diode temperature compensation. The device operates in three distinct modes-boundary mode, discontinuous conduction mode, and low-ripple Burst Mode®-automatically transitioning based on load to maintain efficiency across 0.5% to 100% full-load range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 42V - supports wide-input industrial and automotive battery-fed systems including cold-crank and load-dump conditions. |
| Switch Rating | 65V/3.6A DMOS - enables 18W isolated output with margin for leakage inductance spikes up to 50V during off-time. |
| Quiescent Current | 106µA in Sleep Mode - ensures ultra-low standby power for always-on auxiliary supplies in vehicle ECU modules. |
| Output Regulation | No opto-isolator or third winding required - reduces BOM count, improves reliability, and eliminates opto aging/nonlinearity issues. |
| Operating Temp Range | –55°C to 150°C junction - qualified per AEC-Q100 Grade MP, suitable for under-hood automotive applications. |
| Control Modes | Boundary mode (heavy load), DCM (mid-load), low-ripple Burst Mode® (light load) - maintains >75% efficiency down to 0.5% load. |
| Reference Voltage | 1.00V ±2% on RREF pin - sets output voltage accuracy baseline; line regulation ±0.01%/V ensures stability across input range. |
Pinout & Package
LT8302MPS8E#PBF is housed in an 8-lead plastic SO package with exposed thermal pad (Pin 9, GND), θJA = 33°C/W. The thermally enhanced package enables high-power isolated conversion in compact layouts without heatsinks.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable and input undervoltage lockout input | Accurate 1.214V enable threshold with 14mV hysteresis; pull below 0.3V to shut down; supports programmable VIN UVLO with resistor divider. |
| INTVCC (Pin 2) | Internal 3V LDO output | Powers internal logic and gate driver; must be bypassed with ≥1µF ceramic capacitor to GND; no external supply allowed. |
| VIN (Pin 3) | Main input supply rail | Supplies internal circuitry and serves as reference for RFB feedback path; requires local bulk and ceramic bypassing. |
| GND (Pin 4 + Exposed Pad Pin 9) | Power and signal ground | Exposed pad is electrically and thermally connected to GND; must be soldered directly to PCB ground plane for thermal performance and noise control. |
| SW (Pin 5) | Drain of integrated 65V/3.6A DMOS switch | Connects to transformer primary; high dv/dt node - minimize trace area and loop inductance to reduce EMI and voltage overshoot. |
| RFB (Pin 6) | Feedback current input from flyback pulse | Converts SW flyback voltage into current; ratio with RREF sets output voltage; sensitive to layout parasitics - keep short and away from noise sources. |
| RREF (Pin 7) | Ground-referenced reference resistor node | Sets 1.00V reference point; resistor value ~10kΩ recommended; used with RTC for temperature compensation of output diode VF. |
| TC (Pin 8) | Temperature compensation output | PTAT voltage (1V at 25°C, 3.35mV/K); connects to RREF via RTC to inject compensating current that counteracts diode VF drift. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side sensing architecture | Eliminates opto-isolator and third winding - reduces component count, cost, and long-term drift while improving system reliability. |
| Low-ripple Burst Mode® | Maintains <15mVpp output ripple at light loads while achieving >75% efficiency - critical for noise-sensitive analog and MCU subsystems. |
| Integrated soft-start and compensation | Removes need for external RC networks or op-amps - simplifies design, accelerates prototyping, and ensures stable startup across temperature. |
| Output short-circuit protection | Auto-recovery foldback limits power dissipation during fault - protects transformer, diode, and IC during sustained overloads without latch-off. |
| AEC-Q100 Grade MP qualification | Validated for –55°C to 150°C operation with lifetime reliability data - meets automotive under-hood requirements for ADAS, body control, and infotainment modules. |
Applications
| Automotive Auxiliary Power Supply | Industrial Isolated Sensor Interface |
|---|---|
Use Scenario: Providing isolated 5V/1A housekeeping power to radar ECU modules from 12V battery rail with cold-crank (3V) and load-dump (42V) tolerance. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller managing transformer energy transfer, voltage sampling, and mode transitions without secondary feedback. Use Value: Enables single-chip isolated DC/DC solution meeting AEC-Q100 MP grade, reducing footprint by 40% vs. opto-based designs and eliminating opto aging-related field failures. | Use Scenario: Generating isolated 3.3V/500mA supply for precision analog front-ends in hazardous-area process transmitters powered from 24V loop or industrial bus. IC Role / Device Role / Timing Role: Boundary-mode flyback controller regulating output using primary-side flyback pulse sampling, with TC pin compensating for diode temp drift across –40°C to 85°C ambient. Use Value: Delivers ±2% output accuracy over temperature without opto or third winding - critical for maintaining ADC reference stability and sensor signal integrity. |
| Medical Patient-Monitoring Isolation | Telecom Remote PHY Power |
Use Scenario: Delivering isolated 12V/1.5A power to patient-connected ECG amplifier stages in portable monitors, requiring reinforced isolation and low EMI. IC Role / Device Role / Timing Role: Micropower flyback controller operating in low-ripple Burst Mode® at standby, switching to boundary mode during signal acquisition bursts. Use Value: Achieves <100µA total system standby current while maintaining <20mVpp output ripple during active measurement - satisfies IEC 60601-1 creepage/clearance and EMC requirements. | Use Scenario: Powering remote PHY devices in fiber-to-the-home (FTTH) nodes where space-constrained outdoor cabinets demand high-density isolated DC/DC with wide input range. IC Role / Device Role / Timing Role: High-efficiency flyback controller supporting 36–60V input from PoE++ or DC distribution rails, delivering 5V/2A with minimal heat rise in sealed enclosures. Use Value: Delivers 18W isolated output in SO-8 package with 33°C/W thermal resistance - enables fanless operation and extends service life in unventilated telecom environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8304MPS8E#PBF | Higher 100V/5A switch rating; supports up to 36W output; identical pinout and feature set. | Better suited for 24V/48V input systems requiring >18W or higher voltage margin; same thermal profile but higher peak current capability. | Select LT8304MPS8E#PBF when input can exceed 42V or output power demand exceeds 18W; otherwise LT8302MPS8E#PBF offers optimal cost/performance for ≤18W automotive/industrial use. |
| UCC28740DR | TI controller with 700V MOSFET; requires external FET; no integrated TC pin or low-ripple Burst Mode®. | Targets higher-voltage AC/DC adapters; lacks primary-side temperature compensation and has higher light-load ripple (>50mVpp). | Choose UCC28740DR only if 700V blocking is mandatory and external FET integration is acceptable; LT8302MPS8E#PBF provides superior integration, lower EMI, and tighter regulation for DC-fed isolated supplies. |
Compared with LT8304MPS8E#PBF, LT8302MPS8E#PBF delivers optimized 18W performance with lower gate drive loss and smaller magnetics, while versus UCC28740DR it eliminates external FET BOM cost and achieves 3× lower light-load ripple - making it the preferred choice for space- and noise-constrained DC-fed isolated power in automotive and industrial edge nodes.
Availability
LT8302MPS8E#PBF is available at Aetrix Electronics and suitable for automotive auxiliary power supplies, industrial sensor interfaces, medical isolation barriers, and telecom remote PHY modules requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT8302MPS8E#PBF 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 precision, power, and RF markets with innovation since 1965.
The LT8302 product line delivers monolithic isolated flyback controllers with primary-side regulation, designed specifically for space-constrained, high-reliability automotive and industrial power applications where opto-isolator elimination and extended temperature operation are critical.
FAQ
What is the maximum continuous output power achievable with LT8302MPS8E#PBF?
The LT8302MPS8E#PBF delivers up to 18W of isolated output power under typical conditions - verified at 5V/3.6A, 12V/1.5A, and 24V/0.75A outputs with appropriate transformer turns ratios and layout. This assumes 50V maximum switch stress during off-time, leaving 15V margin for leakage inductance spikes. Actual power depends on input voltage, transformer design, and thermal management; the –55°C to 150°C rating enables full 18W operation even in high-ambient environments when properly heatsinked via the exposed pad.
Does LT8302MPS8E#PBF require an opto-isolator or third winding for regulation?
No, the LT8302MPS8E#PBF does not require an opto-isolator or third winding. It regulates the isolated output voltage by sampling the flyback pulse directly on the SW pin during zero secondary current - a proprietary primary-side sensing technique. This eliminates opto aging, nonlinearity, and unit-to-unit variation while reducing BOM count, cost, and board area. The method is validated across the full –55°C to 150°C operating range and supports tight regulation (±2%) without secondary feedback components.
How does the TC pin on LT8302MPS8E#PBF enable output voltage temperature compensation?
The TC pin on LT8302MPS8E#PBF provides a proportional-to-absolute-temperature (PTAT) voltage - 1.00V at 25°C with 3.35mV/K coefficient. When connected via RTC resistor to RREF, it injects a temperature-dependent current that offsets the negative temperature coefficient of the output diode's forward voltage (VF). This compensation reduces output drift from ±300mV (uncompensated) to ±50mV across –40°C to 125°C for 5V outputs, ensuring stable MCU and analog supply rails in automotive and industrial environments.
What are the key differences between LT8302MPS8E#PBF and LT8302-3 variants?
The LT8302MPS8E#PBF belongs to the standard LT8302 family (not LT8302-3). The core difference lies in boundary detection: LT8302 uses dv/dt slope sensing on the RREF pin, while LT8302-3 uses voltage-level detection. LT8302-3 is more noise-immune on RREF and preferred for multi-output transformers with shared secondaries; LT8302 (including LT8302MPS8E#PBF) is optimized for single-output, low-leakage-inductance designs. Both share identical pinout, specs, and package - only the internal boundary detection logic differs.
Is LT8302MPS8E#PBF qualified for automotive applications?
Yes, LT8302MPS8E#PBF is AEC-Q100 qualified for automotive applications under Grade MP (–55°C to 150°C junction temperature). It undergoes rigorous stress testing including HTOL, TCT, ESD, and EM immunity per automotive standards. The part is manufactured with controlled processes and traceable lots, and is approved for use in engine control units, ADAS domain controllers, body electronics, and infotainment systems where extended temperature operation and long-term reliability are mandatory.
LT8302MPS8E#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tube
- 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):
- 2.8V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- 3.6A
- Frequency - Switching:
- Down to 12kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
LT8302MPS8E#PBF FAQ
1.How can I place an order for LT8302MPS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8302MPS8E#PBF 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 LT8302MPS8E#PBF reliable?
The price and inventory of LT8302MPS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8302MPS8E#PBF is usually 5 days.
3.What payment methods are accepted for LT8302MPS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8302MPS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8302MPS8E#PBF?
LT8302MPS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8302MPS8E#PBF 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 LT8302MPS8E#PBF?
For technical support, including LT8302MPS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8302MPS8E#PBF requirements.
6.How does Aetrix verify that LT8302MPS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LT8302MPS8E#PBF 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 LT8302MPS8E#PBF meets industry standards.
7.What is the process for return or replacement of LT8302MPS8E#PBF?
All LT8302MPS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8302MPS8E#PBF, 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 LT8302MPS8E#PBF part is unused and in its original packaging.
Return procedure for LT8302MPS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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