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Analog Devices Inc. LT3512HMS#TRPBF
- Part No.:
- LT3512HMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads
- Datasheet:
-
LT3512HMS#TRPBF.pdf
- Description:
- IC REG FLYBACK 420MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,840
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Product details
Overview
LT3512HMS#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic high-voltage isolated flyback controller IC with integrated 420mA/150V power switch, designed for primary-side regulated isolated DC/DC conversion. It operates from 4.5V to 100V input, delivers up to 4.5W output power, uses boundary-mode control, and eliminates need for opto-isolator or third winding-enabling compact telecom and industrial auxiliary supplies.
For engineers reviewing the LT3512HMS#TRPBF datasheet, LT3512HMS#TRPBF pinout, LT3512HMS#TRPBF application, or LT3512HMS#TRPBF equivalent, key selection criteria include its 150V SW pin rating, –40°C to 150°C junction temperature grade, primary-side feedback architecture, boundary-mode frequency range (40–650 kHz), and MSOP-16 (12-lead) package with exposed thermal pad.
Technical Context
The LT3512HMS#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 isolation components. Its internal error amplifier compares a temperature-compensated RREF voltage (1.17–1.23 V) against a scaled version of the flyback pulse derived via RFB/RREF resistor divider.
It integrates a 150V-rated bipolar power switch, BIAS-regulated internal driver supply (3.0–3.2 V), EN/UVLO with 1.21 V threshold and hysteresis, and VC pin for loop compensation. The TC pin sources a proportional-to-absolute-temperature (PTAT) current into RREF to cancel diode forward-voltage drift across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 100 V - supports wide-input industrial, telecom, and automotive auxiliary rails without external pre-regulation. |
| Switch Rating | 420 mA / 150 V - enables direct high-voltage flyback operation up to 100 V input with 50 V safety margin on SW pin. |
| Operating Temp | –40°C to +150°C junction - qualified for harsh-environment applications including under-hood automotive and industrial control cabinets. |
| Switching Frequency | 40 kHz to 650 kHz - variable-frequency BCM avoids subharmonic oscillation and improves light-load efficiency vs fixed-frequency CCM. |
| RREF Voltage | 1.17 V to 1.23 V - precision internal bandgap reference used with external RFB/RREF to set output voltage independent of transformer turns ratio. |
| Current Limit | Min 80 mA / Max 800 mA - programmable over 10:1 range via VC pin; enables robust overload and short-circuit protection without sense resistor. |
| Quiescent Current | 3.5 mA typical - low no-load consumption critical for always-on housekeeping supplies in energy-sensitive systems. |
Pinout & Package
LT3512HMS#TRPBF is housed in a 16-lead MSOP package with four leads removed (12-lead functional configuration), featuring an exposed thermal pad for enhanced power dissipation in high-temperature environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (1) | Enable / Undervoltage Lockout Input | 1.21 V threshold with hysteresis; allows precise input UVLO programming or direct VIN connection for simple startup. |
| VIN (3) | Main Input Supply | Powers internal start-up circuitry and serves as reference for DCM comparator; requires local bypass capacitor. |
| GND (5, 8, 9) | Ground Return Paths | Three dedicated ground pins minimize ground bounce and improve noise immunity in high-dI/dt switching paths. |
| BIAS (6) | Internal Bias & Switch Driver Supply | Internally regulated 3.1 V supply; can be tied to VIN if <20 V, enabling operation down to 4.5 V without external bias winding. |
| VC (10) | Error Amplifier Compensation | Connects to RC network for loop stability; additional 100 pF to ground suppresses high-frequency noise. |
| TC (11) | Temperature Compensation Current Source | Sources PTAT current into RREF to offset diode VF drift; RTC sets compensation slope (e.g., 53.6 kΩ → 9.5 µA). |
| RREF (12) | Reference Resistor Input | Accepts 10 kΩ ground-referenced resistor; forms precision voltage divider with RFB to define output regulation point. |
| RFB (14) | Feedback Resistor Input | Connected to SW node; senses reflected flyback voltage; ratio RFB/RREF × 1.2 V defines nominal output after transformer ratio scaling. |
| SW (16) | Switch Collector Output | Drives external transformer primary; rated for 150 V transients; requires minimized trace area to reduce EMI and voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation | Eliminates opto-isolator and third winding - reduces BOM count, cost, and board space while improving long-term reliability and dynamic response. |
| Boundary conduction mode | Enables zero-current switching each cycle - minimizes load regulation error from parasitic resistance and allows smaller magnetics vs CCM. |
| Integrated 150 V power switch | Supports direct 100 V input operation with 50 V transient margin - removes need for external high-voltage MOSFET and associated gate drive complexity. |
| Temperature-compensated feedback | TC pin injects PTAT current into RREF to cancel diode VF drift - maintains ±1% output accuracy over –40°C to +150°C without trimming. |
| No external start-up resistor | Internal start-up circuit draws current directly from VIN - simplifies design and improves efficiency in low-power auxiliary supplies. |
Applications
| Isolated Telecom Power Supplies | Isolated Auxiliary/Housekeeping Power Supplies |
|---|---|
Use Scenario: Providing isolated 5 V/0.5 A bias for optical transceivers and line-card controllers in 48 V telecom systems. IC Role / Device Role / Timing Role: Primary-side flyback controller performing voltage regulation, switching control, and fault protection without secondary-side sensing. Use Value: Enables compact, low-noise, high-reliability 48 V-to-5 V conversion using off-the-shelf transformers (e.g., Würth 750311559) and no optocoupler aging concerns. | Use Scenario: Generating isolated ±15 V rails for analog front-ends and sensor interfaces in industrial PLC modules powered from 24 V DC bus. IC Role / Device Role / Timing Role: Isolated DC/DC controller delivering tightly regulated dual outputs using center-tapped secondary and single LT3512HMS#TRPBF. Use Value: Achieves <±1.5% load regulation across –40°C to +150°C using TC compensation and boundary-mode control, eliminating need for post-regulation LDOs. |
| Isolated Industrial Power Supplies | Isolated Automotive Power Supplies |
Use Scenario: Powering isolated CAN transceivers and microcontroller peripherals in factory automation equipment operating from unregulated 24 V–48 V field buses. IC Role / Device Role / Timing Role: High-integration flyback controller providing reinforced isolation, UVLO, and overcurrent protection in a single MSOP-16 package. Use Value: Supports extended temperature operation (–40°C to +150°C) and withstands 100 V input surges per IEC 61000-4-5, reducing system-level protection components. | Use Scenario: Supplying isolated 3.3 V for infotainment domain controllers in 12 V vehicle architectures with cold-crank down to 4.5 V. IC Role / Device Role / Timing Role: Boundary-mode flyback controller maintaining regulation during deep brownouts and engine cranking events. Use Value: Delivers stable 3.3 V output at 4.5 V input with no external start-up resistor or bias winding - critical for fail-safe automotive subsystems. |
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#TRPBF | Higher 200 V SW rating; no integrated switch; requires external MOSFET; supports higher power (>10 W). | Used where >4.5 W output or >100 V input is required; lacks integrated switch so needs gate driver and layout optimization. | Select LT3748IMS#TRPBF only when higher voltage headroom or higher output power is needed; not drop-in compatible due to external switch requirement. |
| UCC28911DR | Fixed 700 V MOSFET; lower 12 V max VIN; no TC pin; no BIAS pin; different feedback architecture (aux winding required). | Targeted at low-cost AC/DC adapters; unsuitable for wide-input DC/DC or high-temp industrial use. | UCC28911DR is not suitable for 4.5–100 V input or –40°C to +150°C operation; avoid for telecom/industrial designs requiring primary-side regulation without aux winding. |
Compared with LT3512HMS#TRPBF, LT3748IMS#TRPBF offers higher voltage capability but adds design complexity, while UCC28911DR sacrifices input range, temperature grade, and primary-side regulation fidelity for cost reduction in consumer-grade AC/DC.
Availability
LT3512HMS#TRPBF is available at Aetrix Electronics and suitable for isolated telecom power supplies, industrial auxiliary supplies, and automotive housekeeping rails requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for LT3512HMS#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 acquired Linear Technology in 2017 and maintains full product support, manufacturing, and qualification for all LT parts including high-reliability grades.
The LT3512 product line delivers monolithic isolated flyback solutions targeting space-constrained, high-temperature, and safety-critical applications where opto-isolator-free primary-side regulation is essential.
FAQ
What is the maximum input voltage supported by the LT3512HMS#TRPBF?
The LT3512HMS#TRPBF supports an absolute maximum input voltage of 100 V applied to the VIN pin. Its SW pin is rated for 150 V transients, allowing safe operation with sufficient margin for leakage spikes in flyback topologies. Operation above 100 V violates Absolute Maximum Ratings and may cause permanent damage. For designs requiring >100 V input, consider the LT3748IMS#TRPBF with 200 V switch rating.
Does the LT3512HMS#TRPBF require an opto-isolator or third winding for regulation?
No, the LT3512HMS#TRPBF does not require an opto-isolator or third winding. It achieves primary-side regulation by sensing the reflected flyback voltage at the SW pin when secondary current reaches zero. This architecture eliminates isolation components, reduces BOM cost and size, and avoids opto aging and nonlinearity issues inherent in traditional flyback designs.
What is the purpose of the TC pin on the LT3512HMS#TRPBF?
The TC pin on the LT3512HMS#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. By connecting a resistor (e.g., 53.6 kΩ) from TC to ground, the resulting current offsets diode VF drift, enabling tight output voltage regulation across –40°C to +150°C without external trimming.
Can the LT3512HMS#TRPBF operate down to 4.5 V input without an external bias winding?
Yes, the LT3512HMS#TRPBF can operate down to 4.5 V input without an external bias winding by connecting the BIAS pin directly to VIN. In this configuration, the internal BIAS regulator supplies the switch driver and control circuitry. The device maintains regulation and startup capability across the full 4.5 V–100 V input range, making it ideal for automotive cold-crank and industrial brownout scenarios.
What package type and thermal characteristics does the LT3512HMS#TRPBF use?
The LT3512HMS#TRPBF uses a 16-lead MSOP package with four leads removed (12-lead functional configuration) and an exposed thermal pad. Its θJA is 90°C/W. The H-grade temperature rating (–40°C to +150°C junction) and thermal pad enable reliable operation in high-ambient environments such as industrial control cabinets and under-hood automotive applications when properly mounted on a thermally optimized PCB.
LT3512HMS#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP
LT3512HMS#TRPBF FAQ
1.How can I place an order for LT3512HMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3512HMS#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 LT3512HMS#TRPBF reliable?
The price and inventory of LT3512HMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3512HMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3512HMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3512HMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3512HMS#TRPBF?
LT3512HMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3512HMS#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 LT3512HMS#TRPBF?
For technical support, including LT3512HMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3512HMS#TRPBF requirements.
6.How does Aetrix verify that LT3512HMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3512HMS#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 LT3512HMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3512HMS#TRPBF?
All LT3512HMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3512HMS#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 LT3512HMS#TRPBF part is unused and in its original packaging.
Return procedure for LT3512HMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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