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Analog Devices Inc. LT3512EMS#TRPBF
- Part No.:
- LT3512EMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads
- Datasheet:
-
LT3512EMS#TRPBF.pdf
- Description:
- IC REG FLYBACK 420MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,889
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Product details
Overview
LT3512EMS#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic high-voltage isolated flyback controller IC with integrated 420mA/150V power switch, boundary-mode operation, primary-side sensing, and 4.5V–100V input range-designed for compact, opto-isolator-free telecom and industrial auxiliary power supplies delivering up to 4.5W.
For engineers reviewing the LT3512EMS#TRPBF datasheet, LT3512EMS#TRPBF pinout, LT3512EMS#TRPBF application, or LT3512EMS#TRPBF equivalent, key selection criteria include primary-side regulation capability, 16-lead MSOP package thermal performance, boundary-mode frequency range (40–650kHz), internal bias supply via BIAS pin, and transformer turns-ratio-dependent output voltage setting using RFB/RREF resistors.
Technical Context
The LT3512EMS#TRPBF implements current-mode boundary conduction mode (BCM) control, sampling the reflected flyback voltage at the SW pin when secondary current reaches zero to derive output voltage without optocoupler or third winding. Its flyback error amplifier compares this sampled signal against a 1.20V internal bandgap reference, while the TC pin enables temperature compensation of diode forward-voltage drift via external resistor.
Internal circuitry includes a 150V-rated SW node, EN/UVLO with 1.21V threshold and hysteresis, VC pin for loop compensation, and BIAS pin supporting self-biasing down to 4.5V input-enabling direct VIN-to-BIAS connection in low-input applications. The device operates across –40°C to +125°C junction temperature and integrates oscillator, latch, driver, and protection logic in a single die.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 100V - supports wide-range industrial, telecom, and automotive inputs without external pre-regulation |
| Integrated Power Switch | 420mA, 150V rated - eliminates need for external MOSFET and reduces BOM count and layout area |
| Switching Frequency Range | 40kHz to 650kHz - variable-frequency BCM enables high efficiency across load range and avoids subharmonic oscillation |
| Output Power Capability | Up to 4.5W isolated - sufficient for housekeeping, gate drive, and sensor bias supplies in safety-isolated systems |
| RREF Reference Voltage | 1.17V to 1.23V (typ 1.20V) - precise internal bandgap sets output accuracy and enables ±1% output regulation with proper transformer turns ratio |
| EN/UVLO Threshold | 1.15V to 1.27V - programmable undervoltage lockout using resistor divider ensures reliable start-up and brownout protection |
| Operating Temperature | –40°C to +125°C - qualified for industrial and extended-temperature embedded power applications |
| Package Thermal Resistance | θJA = 90°C/W - enables 4.5W operation with moderate PCB copper area and no forced airflow |
Pinout & Package
LT3512EMS#TRPBF is housed in a 16-lead plastic MSOP package with four leads removed (12-pin functional configuration), optimized for high-voltage isolation and thermal dissipation in space-constrained isolated DC/DC designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Undervoltage Lockout Input | Starts or halts switching based on 1.21V threshold; supports programmable UVLO hysteresis via external resistor divider |
| VIN (Pin 3) | Main Input Supply | Supplies internal startup circuitry and serves as reference for DCM comparator; requires local bypass capacitor |
| GND (Pins 5, 8, 9) | Ground Return Paths | Three dedicated ground pins minimize ground bounce and improve EMI performance in high-dI/dt flyback operation |
| BIAS (Pin 6) | Internal Bias Supply | Provides regulated ~3.15V supply for driver and control logic; can be tied to VIN if VIN ≤ 20V and no third winding is used |
| VC (Pin 10) | Compensation Node | Connects external RC network to stabilize feedback loop; 100pF to ground suppresses noise coupling into error amplifier |
| TC (Pin 11) | Temperature Compensation Current Source | Sources proportional-to-absolute-temperature (PTAT) current into RREF to cancel diode VF drift over temperature |
| RREF (Pin 12) | Reference Resistor Connection | Accepts 10kΩ ground-referenced resistor; sets gain for flyback voltage feedback path and defines output voltage scaling |
| RFB (Pin 14) | Feedback Resistor Connection | Connects to transformer primary (SW node); ratio RFB/RREF × 1.20V × (1/NPS) determines regulated output voltage |
| SW (Pin 16) | Switch Collector Output | Drives transformer primary; rated for 150V transients but must remain ≤100V during steady-state flyback for reliability |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation | Eliminates optocoupler and third winding-reducing cost, size, and long-term drift while maintaining ±1% output regulation |
| Built-in 420mA/150V switch | Enables complete isolated flyback solution with only transformer, two feedback resistors, and minimal passives-no external high-voltage MOSFET required |
| Boundary conduction mode (BCM) | Ensures zero-current switching on secondary side each cycle-improving efficiency, reducing EMI, and enabling smaller magnetics than CCM |
| Self-biasing BIAS pin | Allows operation down to 4.5V input without external startup resistor-simplifying design and improving light-load efficiency |
| Temperature-compensated feedback | TC pin current source cancels diode forward-voltage drift, enabling stable output regulation across –40°C to +125°C ambient |
| 16-lead MSOP package | Provides high-voltage creepage/clearance and thermal performance in footprint < 25 mm²-ideal for space-constrained isolated auxiliary rails |
Applications
| Telecom Auxiliary Power | Industrial Sensor Isolation |
|---|---|
Use Scenario: Providing isolated 5V/0.5A bias for optical transceivers and line-card monitoring circuits in 48V telecom systems. IC Role / Device Role / Timing Role: Primary-side flyback controller managing transformer energy transfer, output voltage regulation, and UVLO sequencing. Use Value: Enables compact, certified 1500V isolation without optocoupler aging or calibration drift-meeting GR-1089 immunity and IEC 60950 creepage requirements. | Use Scenario: Generating isolated ±15V supplies for analog front-end instrumentation amplifiers in PLC I/O modules. IC Role / Device Role / Timing Role: Dual-output flyback controller regulating both positive and negative rails using center-tapped secondary and synchronous rectification. Use Value: Achieves <±1.5% cross-regulation across load steps using boundary-mode timing and matched transformer windings-eliminating post-regulator LDOs. |
| Automotive Body Control Unit | Medical Patient Monitoring |
Use Scenario: Delivering isolated 3.3V/0.3A power to CAN transceiver and microcontroller in 12V/24V vehicle body electronics. IC Role / Device Role / Timing Role: High-input flyback controller with EN/UVLO hysteresis ensuring robust start-up during cold-crank (6.5V) and load-dump (120V) events. Use Value: Maintains regulation during 4.5V–100V input transients without external TVS or pre-regulator-reducing component count and board area by >30%. | Use Scenario: Supplying isolated 5V/0.2A power to patient-connected ECG front-end with reinforced 4kVDC isolation barrier. IC Role / Device Role / Timing Role: Safety-certified flyback controller implementing primary-side sensing to meet IEC 60601-1 2×MOPP requirements without optocoupler certification overhead. Use Value: Reduces time-to-certification by eliminating optocoupler lifetime validation and enabling single-source traceability for isolation barrier components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCC28911DR | Integrated 700V MOSFET; fixed 50kHz frequency; no TC pin or primary-side sampling-uses auxiliary winding feedback | Requires third winding; less accurate regulation over temperature; higher peak switch stress at low input | Preferred for ultra-low-cost, low-power (<1W), non-precision auxiliary rails where transformer cost dominates |
| MAX17690ATP+ | 65V max input; 600mA/65V switch; digital programmable soft-start and fault reporting; no BIAS pin self-start | Limited to lower-input systems; requires external bias supply or startup circuit; lacks primary-side sensing architecture | Chosen when digital configurability, fault logging, or tighter EMI control via spread-spectrum is prioritized over wide-input range |
Compared with UCC28911DR and MAX17690ATP+, the LT3512EMS#TRPBF uniquely delivers primary-side regulation with 100V input capability, self-biasing, and temperature-compensated feedback-making it optimal for precision, wide-input, opto-free isolated supplies where transformer count, long-term stability, and thermal performance are critical.
Availability
LT3512EMS#TRPBF is available at Aetrix Electronics and suitable for telecom auxiliary power, industrial sensor isolation, automotive body control units, and medical patient monitoring requiring stable component supply and long-lifecycle support.
Supply support for LT3512EMS#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors for precision, industrial, and automotive applications.
The LT3512EMS#TRPBF belongs to Linear's isolated power controller product line, engineered specifically to replace optocoupler-based flyback solutions with monolithic, primary-side regulated ICs for compact, reliable, and certifiable isolated DC/DC conversion.
FAQ
What is the maximum allowable SW pin voltage for continuous operation of the LT3512EMS#TRPBF?
The LT3512EMS#TRPBF SW pin is rated for 150V transients but must remain ≤100V during steady-state flyback operation to ensure reliability and prevent cumulative stress. This limit accounts for reflected output voltage plus input voltage minus diode drop, leaving ≥50V margin for leakage spikes. Exceeding 100V risks premature failure even if below absolute maximum rating.
Can the LT3512EMS#TRPBF operate without an external transformer third winding or optocoupler?
Yes-the LT3512EMS#TRPBF uses primary-side flyback waveform sampling to regulate output voltage directly, eliminating the need for either a third winding or optocoupler. This architecture relies on precise timing of the zero-current crossing on the secondary side, enabled by boundary-mode control and internal flyback error amplifier.
How is output voltage set on the LT3512EMS#TRPBF, and what determines its accuracy?
Output voltage is set by the ratio of external resistors RFB and RREF, multiplied by the internal 1.20V bandgap reference and divided by the transformer's primary-to-secondary turns ratio (NPS). Accuracy depends on resistor tolerance, transformer turns-ratio tolerance (±1% recommended), and TC pin compensation-achieving ±1% typical regulation across line, load, and temperature when properly implemented.
Does the LT3512EMS#TRPBF require an external startup resistor?
No-the LT3512EMS#TRPBF features a self-biasing BIAS pin that allows direct connection to VIN for inputs ≤20V, eliminating the need for an external startup resistor. At inputs as low as 4.5V, connecting BIAS to VIN enables full functionality without auxiliary bias circuitry-reducing component count and improving light-load efficiency.
What is the role of the TC pin on the LT3512EMS#TRPBF, and how is it configured?
The TC pin on the LT3512EMS#TRPBF sources a proportional-to-absolute-temperature (PTAT) current into the RREF node to compensate for the negative temperature coefficient of the output rectifier diode's forward voltage. It is configured with a single resistor to ground; typical value is 53.6kΩ, yielding ~9.5μA current that offsets VF drift and maintains output regulation across –40°C to +125°C.
LT3512EMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads
- 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):
- 4.5V
- Voltage - Input (Max):
- 100V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- 420mA
- Frequency - Switching:
- 40kHz ~ 650kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP
LT3512EMS#TRPBF FAQ
1.How can I place an order for LT3512EMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3512EMS#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 LT3512EMS#TRPBF reliable?
The price and inventory of LT3512EMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3512EMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3512EMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3512EMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3512EMS#TRPBF?
LT3512EMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3512EMS#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 LT3512EMS#TRPBF?
For technical support, including LT3512EMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3512EMS#TRPBF requirements.
6.How does Aetrix verify that LT3512EMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3512EMS#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 LT3512EMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3512EMS#TRPBF?
All LT3512EMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3512EMS#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 LT3512EMS#TRPBF part is unused and in its original packaging.
Return procedure for LT3512EMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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