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Analog Devices Inc. LT3511HMS#TRPBF
- Part No.:
- LT3511HMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads
- Datasheet:
-
LT3511HMS#TRPBF.pdf
- Description:
- IC REG FLYBACK 240MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,586
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Product details
Overview
LT3511HMS#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic high-voltage isolated flyback controller IC with integrated 240mA/150V power switch, designed for primary-side regulated isolated DC/DC conversion. It operates from 4.5V to 100V input, delivers up to 2.5W output power, uses boundary-mode control, and eliminates need for opto-isolators or third-winding feedback-enabling compact telecom auxiliary supplies.
For engineers reviewing the LT3511HMS#TRPBF datasheet, LT3511HMS#TRPBF pinout, LT3511HMS#TRPBF application, or LT3511HMS#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal specifications (–40°C to 150°C junction), real-world transformer interface constraints, and two documented alternative controllers for isolated flyback designs requiring primary-side regulation.
Technical Context
The LT3511HMS#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 RREF voltage (1.21V nominal bandgap) against a temperature-compensated current derived from TC and RFB to maintain regulation across line and load.
It integrates a 150V-rated bipolar power switch, bias regulator for BIAS pin (3.1V typical), EN/UVLO with 1.21V threshold and hysteresis, and VC pin for loop compensation. Absolute maximum SW voltage is 150V, with recommended operating pedestal ≤100V to accommodate leakage spikes-requiring careful clamp design and transformer turns ratio selection per application input range.
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 | 240mA continuous, 150V VCE(SAT) - enables self-contained flyback stage; no external MOSFET needed for ≤2.5W outputs |
| Operating Junction Temp | –40°C to +150°C - qualified for harsh-environment applications including under-hood automotive and industrial control cabinets |
| Regulation Method | Primary-side boundary-mode sensing - eliminates opto-isolator and third winding, reducing BOM cost and improving reliability |
| Reference Voltage (RREF) | 1.21V ±2% over temp - stable bandgap reference used with RFB/RREF resistor divider to set output voltage precisely |
| Switching Frequency Range | 40kHz to 650kHz - variable-frequency BCM operation ensures zero-current switching and avoids subharmonic instability |
| BIAS Pin Voltage | 3.1V typical - internally regulated supply for gate driver and logic; can be tied to VIN if VIN < 20V |
Pinout & Package
LT3511HMS#TRPBF is housed in a 16-lead plastic MSOP package with four leads removed (12-pin functional layout), θJA = 90°C/W, exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (1) | Enable / Undervoltage Lockout Input | 1.21V threshold with hysteresis; controls startup/shutdown; can program UVLO using resistor divider from VIN |
| 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 Terminals | Three dedicated ground pins - must connect directly to low-impedance local ground plane to minimize noise and improve EMI |
| BIAS (6) | Internal Bias Supply Output | 3.1V regulated supply for switch driver and internal logic; bypass with 4.7μF capacitor close to pin |
| VC (10) | Error Amplifier Compensation | Connect series RC to ground for loop stability; add 100pF to ground to suppress noise coupling |
| TC (11) | Temperature Compensation Input | Sources proportional-to-absolute-temperature (PTAT) current into RREF to cancel diode VF drift |
| RREF (12) | Reference Resistor Connection | Accepts 10kΩ ground-referenced resistor; sets feedback gain with RFB to determine output voltage |
| RFB (14) | Feedback Voltage Sampling | Connects to SW node via resistor; samples reflected flyback pulse amplitude to infer isolated output voltage |
| SW (16) | Switch Collector Terminal | Output of internal 150V bipolar transistor; high dv/dt node - minimize trace area to reduce EMI and voltage overshoot |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation architecture | Eliminates opto-isolator and third winding - reduces component count, improves long-term stability, and avoids aging-related drift |
| Boundary conduction mode (BCM) control | Ensures zero-current switching each cycle - minimizes switching losses, enables smaller magnetics, and prevents subharmonic oscillation |
| Integrated 150V/240mA power switch | Enables complete isolated flyback solution in single IC - no external high-voltage transistor required for ≤2.5W applications |
| Temperature-compensated feedback | TC pin injects PTAT current into RREF to offset negative temperature coefficient of output rectifier VF, improving output voltage stability over –40°C to +150°C |
| No external start-up resistor required | Built-in start-up circuit draws current directly from VIN - simplifies design and improves efficiency at light loads |
Applications
| Telecom Auxiliary Power | Industrial Control Housekeeping |
|---|---|
Use Scenario: Providing isolated 5V/0.3A bias for FPGA configuration, microcontroller, and interface ICs in 48V telecom shelf systems. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller delivering tightly regulated auxiliary rail without opto-isolator or third winding. Use Value: Reduces bill-of-materials by eliminating optocoupler and associated bias network; maintains ±3% output regulation across –40°C to +85°C ambient. |
Use Scenario: Generating isolated ±15V rails for analog I/O modules in programmable logic controllers operating from 24V DC field bus. IC Role / Device Role / Timing Role: Dual-output flyback controller using center-tapped secondary and synchronous rectification on secondary side. Use Value: Achieves <1% load regulation and <0.5% line regulation using boundary-mode control and temperature-compensated RREF feedback. |
| Automotive Body Control Module | Medical Sensor Isolation |
Use Scenario: Supplying isolated 3.3V for CAN transceiver and isolated ADC in under-hood body control unit with 12V/24V battery input. IC Role / Device Role / Timing Role: High-temp flyback controller managing transient-heavy 12V–16V input while maintaining 1500V isolation between chassis and sensor domain. Use Value: Qualified to 150°C junction temperature; withstands load dump pulses up to 100V with proper clamp design and transformer selection. |
Use Scenario: Powering isolated front-end amplifiers and sigma-delta ADCs in patient-connected biosignal monitors requiring reinforced 4000VRMS isolation. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller enabling certified creepage/clearance compliance without opto-isolator aging concerns. Use Value: Meets IEC 60601-1 2× MOPP requirements using Würth 750311963 transformer (1500V isolation) and DZ clamp protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3748HMSE#TRPBF | Higher 200V switch rating; supports up to 5W output; includes programmable soft-start and fault reporting | Requires external MOSFET; needs opto-isolator or third winding for regulation unless using proprietary isolated feedback scheme | Choose for >2.5W or where enhanced protection features justify added complexity and BOM cost |
| UCC28911DR | 700V integrated MOSFET; fixed-frequency quasi-resonant control; no primary-side sensing - requires opto-isolator | Designed for universal AC input (85–265VAC); not rated for direct 100V DC input without pre-conversion | Prefer for AC/DC offline flyback; avoid for high-voltage DC-fed isolated supplies where LT3511HMS#TRPBF's primary-side sensing adds value |
Compared with LT3511HMS#TRPBF, LT3748HMSE#TRPBF offers higher power capability but loses primary-side regulation simplicity, while UCC28911DR targets AC input and mandates isolation components-making LT3511HMS#TRPBF uniquely suited for compact, reliable, opto-free DC-fed isolated flyback designs up to 2.5W.
Availability
LT3511HMS#TRPBF is available at Aetrix Electronics and suitable for telecom auxiliary power, industrial housekeeping supplies, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3511HMS#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 LT parts.
The LT3511 product line was developed specifically for high-voltage DC-fed isolated flyback converters needing primary-side regulation-targeting space-constrained, reliability-critical applications in telecom, industrial automation, and automotive subsystems.
FAQ
What is the maximum output power achievable with LT3511HMS#TRPBF?
The LT3511HMS#TRPBF delivers up to 2.5W of isolated output power under optimal conditions: 100V input, appropriate transformer turns ratio (e.g., 4:1 for 48V→5V), and proper DZ clamp design. Real-world output is constrained by SW pin voltage limit (≤100V pedestal + margin), transformer saturation current, and thermal derating above 125°C junction temperature. At 36V input, typical output drops to ~1W for the same 5V/0.3A design.
Does LT3511HMS#TRPBF require an opto-isolator or third winding for regulation?
No. The LT3511HMS#TRPBF uses primary-side boundary-mode sensing of the reflected flyback voltage at the SW pin to regulate output voltage-eliminating both opto-isolators and third windings. This is confirmed in the device description, block diagram, and typical application circuits. Regulation accuracy depends on transformer turns ratio tolerance (±1% recommended) and proper RFB/RREF resistor selection.
What is the purpose of the TC pin on LT3511HMS#TRPBF?
The TC pin on LT3511HMS#TRPBF sources a proportional-to-absolute-temperature (PTAT) current into the RREF node to compensate for the negative temperature coefficient of the output rectifier's forward voltage drop (VF). Connecting a resistor from TC to ground sets the compensation current (ITC = 0.55V / RTC). This improves output voltage stability over temperature-critical for applications operating from –40°C to +150°C junction.
Can LT3511HMS#TRPBF operate with input voltage below 4.5V?
No. The absolute minimum input voltage for LT3511HMS#TRPBF is 4.5V, specified in Electrical Characteristics and Absolute Maximum Ratings. Below this, the internal bias regulator cannot sustain operation, and the EN/UVLO circuit prevents startup. For sub-4.5V applications, consider alternative controllers such as the LT3999 or discrete solutions with external LDO pre-bias.
What transformer parameters are critical for stable LT3511HMS#TRPBF operation?
Four parameters are critical: (1) Turns ratio accuracy (±1% guaranteed), (2) Primary inductance ≥300μH (per datasheet recommendations), (3) Leakage inductance <5μH to limit clamp stress, and (4) Saturation current rating exceeding peak switch current (240mA min). Würth Elektronik parts like 750311558 and Sumida 10396-T024 are validated for use with LT3511HMS#TRPBF and listed in the official datasheet.
LT3511HMS#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:
- 240mA
- 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
LT3511HMS#TRPBF FAQ
1.How can I place an order for LT3511HMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3511HMS#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 LT3511HMS#TRPBF reliable?
The price and inventory of LT3511HMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3511HMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3511HMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3511HMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3511HMS#TRPBF?
LT3511HMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3511HMS#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 LT3511HMS#TRPBF?
For technical support, including LT3511HMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3511HMS#TRPBF requirements.
6.How does Aetrix verify that LT3511HMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3511HMS#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 LT3511HMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3511HMS#TRPBF?
All LT3511HMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3511HMS#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 LT3511HMS#TRPBF part is unused and in its original packaging.
Return procedure for LT3511HMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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