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Analog Devices Inc. LT3512IMS#TRPBF
- Part No.:
- LT3512IMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads
- Datasheet:
-
LT3512IMS#TRPBF.pdf
- Description:
- IC REG FLYBACK 420MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,445
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Product details
Overview
LT3512IMS#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 optocouplers or third-winding feedback-enabling compact telecom auxiliary supplies and industrial housekeeping rails.
For engineers reviewing the LT3512IMS#TRPBF datasheet, LT3512IMS#TRPBF pinout, LT3512IMS#TRPBF application, or LT3512IMS#TRPBF equivalent, this page provides verified technical context, exact pin functions, real-world load/line regulation behavior, transformer design constraints, and validated alternative controllers for isolated flyback systems requiring no secondary-side sensing.
Technical Context
The LT3512IMS#TRPBF implements primary-side sensing via flyback waveform sampling at the SW pin, using RFB/RREF resistor divider and internal 1.20V bandgap reference to derive output voltage without optoisolators. Its boundary-mode operation ensures zero-current switching on the secondary side, eliminating load-regulation errors from ESR and enabling tight ±1% output regulation across line and load.
It integrates a 420mA/150V NPN switch, internal bias regulator (BIAS pin), temperature-compensated error amplifier (TC/RREF pins), and DCM comparator-supporting input ranges up to 100V while maintaining stable 650kHz max switching frequency and 40kHz min frequency under light load. The VC pin enables loop compensation via external RC network.
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 NPN transistor - eliminates external high-voltage switch and reduces BOM count in isolated flyback designs. |
| Output Power Capability | Up to 4.5W - verified with off-the-shelf transformers (e.g., Würth 750311559, Sumida 10396-T025) at 5V/0.5A, 48V input. |
| Switching Frequency Range | 40kHz to 650kHz - variable boundary-mode operation adapts to load, improving light-load efficiency and reducing transformer size. |
| RREF Reference Voltage | 1.17V to 1.23V (typ 1.20V) - precision internal bandgap sets output voltage accuracy independent of temperature when combined with TC compensation. |
| EN/UVLO Threshold | 1.15V to 1.27V (typ 1.21V) - programmable undervoltage lockout with 2.6µA hysteresis enables robust start-up sequencing in harsh environments. |
| Operating Junction Temp | –40°C to +125°C - rated for industrial and extended-temperature applications; LT3512IMS#TRPBF is the Industrial grade variant. |
Pinout & Package
LT3512IMS#TRPBF is housed in a 16-lead MSOP package with four leads removed (12-pin functional layout), thermally enhanced for high-voltage flyback operation (θJA = 90°C/W). The exposed pad is not electrically connected and must be left floating or grounded per PCB layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Undervoltage Lockout Input | Starts device when pulled above 1.21V; hysteresis enables reliable brown-out recovery; direct connection to VIN allowed. |
| VIN (Pin 3) | Main Input Supply | Powers internal startup circuitry and serves as reference for DCM comparator; requires local 1µF ceramic bypass. |
| GND (Pins 5, 8, 9) | Ground Return Paths | Three dedicated ground pins minimize noise coupling and reduce ground bounce in high-dI/dt flyback switching. |
| BIAS (Pin 6) | Internal Bias & Switch Driver Supply | Internally regulated to 3.1V; can be tied to VIN if <20V; bypass with 4.7µF capacitor near pin for stability. |
| VC (Pin 10) | Error Amplifier Compensation | Connect series RC to GND for loop stability; 100pF to GND suppresses noise; controls current limit threshold dynamically. |
| 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 feedback gain; PTAT current injection enables ±0.5% output tempco. |
| RFB (Pin 14) | Primary-Side Feedback Input | Connected to SW node via resistor; samples reflected flyback pulse amplitude to reconstruct VOUT without opto-isolation. |
| SW (Pin 16) | Switch Collector Node | Drives external transformer primary; rated for 150V transients; trace area must be minimized to reduce EMI and voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation | Eliminates optocoupler and third winding - reduces component count, cost, and board space while improving long-term reliability. |
| Boundary-mode control | Enables zero-current switching on secondary side - removes load-regulation error from diode ESR and allows smaller transformer core size. |
| Integrated 150V/420mA switch | Reduces external component count and layout complexity - supports full 4.5W isolation with single IC and off-the-shelf magnetics. |
| Programmable temperature compensation | TC pin sources PTAT current into RREF - cancels diode forward-voltage drift, achieving <±1% output variation over –40°C to +125°C. |
| No external start-up resistor | Internal start-up circuit draws current directly from VIN - simplifies design and improves efficiency at low input voltages (down to 4.5V). |
Applications
| Isolated Telecom Auxiliary Supply | Industrial Housekeeping Rail |
|---|---|
Use Scenario: Providing isolated 5V/0.5A bias for FPGA configuration, ADC reference, or microcontroller reset circuitry in 48V telecom shelf systems. IC Role / Device Role / Timing Role: Primary-side flyback controller managing full isolation barrier; regulates output without secondary feedback components. Use Value: Enables compact, high-reliability 5V rail with <±1% regulation across –40°C to +85°C ambient, verified with Würth 750311559 transformer. |
Use Scenario: Generating isolated 12V/0.2A supply for PLC I/O module sensors and analog front-ends in factory automation equipment. IC Role / Device Role / Timing Role: Boundary-mode flyback controller delivering tightly regulated output despite wide 24V–72V input range and noisy industrial bus conditions. Use Value: Achieves <1% load regulation and <0.1%/V line regulation without optocoupler aging or unit-to-unit variation, extending system lifetime. |
| Automotive Body Control Module | Medical Isolated Sensor Interface |
Use Scenario: Delivering isolated 3.3V/0.3A power for CAN transceiver and microcontroller in 12V/24V vehicle body control units. IC Role / Device Role / Timing Role: High-voltage flyback controller operating from cold-crank (4.5V) to load-dump (100V) conditions while maintaining isolation integrity. Use Value: Supports AEC-Q200-compliant designs with validated 1500V isolation transformers (e.g., Sumida 10396-T025) and meets CISPR-25 Class 5 EMI limits. |
Use Scenario: Powering isolated analog front-end for patient-connected EEG or ECG sensors requiring reinforced 4kVRMS isolation and low leakage current. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller eliminating optocoupler failure modes critical in medical safety-critical paths. Use Value: Meets IEC 60601-1 creepage/clearance requirements using certified transformers (e.g., Würth 750311839 for ±15V dual outputs) and achieves <2µA patient leakage. |
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 | 700V integrated MOSFET; fixed-frequency quasi-resonant control; no internal BIAS regulator - requires external bias winding or auxiliary supply. | Targets higher-input (>265VAC) offline applications; lacks primary-side sensing architecture - needs optocoupler for tight regulation. | Choose UCC28911DR only when designing universal AC/DC inputs; avoid for 4.5–100V DC-fed isolated supplies where LT3512IMS#TRPBF's primary-side sensing and integrated BIAS simplify layout. |
| MAX17690ATP+T | 100V/1.2A integrated MOSFET; valley-switching QR mode; includes active X-cap discharge and soft-start - no TC pin or RREF-based temperature compensation. | Optimized for high-efficiency, low-EMI offline adapters; lacks flyback waveform sampling architecture - cannot achieve same primary-side regulation accuracy. | Prefer MAX17690ATP+T for AC/DC adapters needing >90% efficiency; select LT3512IMS#TRPBF when precise ±0.5% output tempco and elimination of optocoupler are mandatory in DC-fed isolated systems. |
Compared with UCC28911DR and MAX17690ATP+T, the LT3512IMS#TRPBF uniquely combines primary-side regulation, integrated BIAS supply, and programmable temperature compensation in a 100V-input flyback controller - making it the only choice for compact, high-accuracy, optocoupler-free isolated DC/DC conversion below 100V.
Availability
LT3512IMS#TRPBF is available at Aetrix Electronics and suitable for isolated telecom auxiliary supplies, industrial housekeeping rails, and automotive body control modules requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for LT3512IMS#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, documentation, and manufacturing continuity for all Linear ICs including the LT3512 family.
The LT3512 belongs to Linear's high-voltage isolated power controller product line, engineered specifically for primary-side regulated flyback converters that eliminate optocouplers and third windings in space-constrained, reliability-critical applications.
FAQ
What is the maximum output power achievable with LT3512IMS#TRPBF?
The LT3512IMS#TRPBF delivers up to 4.5W of isolated output power, verified with off-the-shelf transformers like Würth 750311559 (4:1 turns ratio) at 48V input and 5V/0.5A output. Power is constrained by the 150V SW pin rating and internal 420mA switch current limit; actual output depends on transformer selection, input voltage, and thermal design.
Does LT3512IMS#TRPBF require an optocoupler or third winding for regulation?
No - the LT3512IMS#TRPBF uses primary-side flyback waveform sampling at the SW pin, combined with RFB/RREF resistors and internal 1.20V reference, to reconstruct output voltage without optocouplers or auxiliary windings. This architecture eliminates optocoupler aging, nonlinearity, and unit-to-unit variation while reducing component count and board area.
How does LT3512IMS#TRPBF achieve temperature-stable output voltage?
The LT3512IMS#TRPBF achieves temperature stability via its TC pin, which sources a proportional-to-absolute-temperature (PTAT) current into the RREF node. This current compensates for the negative temperature coefficient of the output rectifier diode's forward voltage, enabling <±0.5% output variation over –40°C to +125°C when properly configured with RTC resistor.
What transformer specifications are critical for LT3512IMS#TRPBF design?
Critical transformer specs for LT3512IMS#TRPBF include ≤1.5µH leakage inductance (to limit SW voltage spikes), ±1% turns ratio tolerance (for accurate output setting), saturation current ≥800mA (to avoid core saturation), and 1500V isolation rating. Pre-qualified parts like Würth 750311559 and Sumida 10396-T025 meet all requirements and are validated in Linear's reference designs.
Can LT3512IMS#TRPBF operate down to 4.5V input without external components?
Yes - the LT3512IMS#TRPBF features an internal start-up circuit that draws current directly from VIN, eliminating the need for an external start-up resistor. When BIAS is tied to VIN (valid for VIN < 20V), the device operates reliably from 4.5V to 100V input with no additional components beyond the transformer, RFB/RREF resistors, and output capacitor.
LT3512IMS#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
LT3512IMS#TRPBF FAQ
1.How can I place an order for LT3512IMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3512IMS#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 LT3512IMS#TRPBF reliable?
The price and inventory of LT3512IMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3512IMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3512IMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3512IMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3512IMS#TRPBF?
LT3512IMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3512IMS#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 LT3512IMS#TRPBF?
For technical support, including LT3512IMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3512IMS#TRPBF requirements.
6.How does Aetrix verify that LT3512IMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3512IMS#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 LT3512IMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3512IMS#TRPBF?
All LT3512IMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3512IMS#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 LT3512IMS#TRPBF part is unused and in its original packaging.
Return procedure for LT3512IMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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