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Analog Devices Inc. LT3511MPMS#TRPBF
- Part No.:
- LT3511MPMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads
- Datasheet:
-
LT3511MPMS#TRPBF.pdf
- Description:
- IC REG FLYBACK 240MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,801
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Product details
Overview
LT3511MPMS#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-isolator or third winding-enabling compact telecom and industrial auxiliary supplies.
For engineers reviewing the LT3511MPMS#TRPBF datasheet, LT3511MPMS#TRPBF pinout, LT3511MPMS#TRPBF application, or LT3511MPMS#TRPBF equivalent, this page provides verified specifications, MSOP-16 pin functions, temperature-compensated feedback architecture, and validated alternative parts for ruggedized isolated power design.
Technical Context
The LT3511MPMS#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 secondary-side feedback components. Its boundary-mode operation ensures zero-current switching on secondary side, minimizing load regulation error from ESR and enabling tight ±1% output tolerance over line/load/temperature.
It integrates EN/UVLO with 1.21V threshold and 2.6μA hysteresis, BIAS pin for internal driver supply (3.1V regulated), TC pin for diode-forward-voltage temperature compensation, and VC pin for error amplifier compensation-supporting stable regulation across –55°C to 150°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 100V - supports wide-input industrial, telecom, and automotive auxiliary rails without external pre-regulation. |
| Integrated Power Switch | 240mA, 150V rated - enables self-contained flyback topology with no external MOSFET required. |
| Output Power Capability | Up to 2.5W - sufficient for isolated housekeeping supplies in PLCs, base stations, and medical monitors. |
| Operating Temperature Range | –55°C to +150°C (MP grade) - qualified for extended-temperature military, aerospace, and downhole applications. |
| Switching Frequency Range | 40kHz to 650kHz - variable boundary-mode frequency adapts to load, improving light-load efficiency and reducing EMI. |
| RREF Reference Voltage | 1.17V to 1.23V (±2.5%) - precision internal bandgap sets output accuracy when used with RFB/RREF divider. |
| EN/UVLO Threshold | 1.15V to 1.27V - programmable undervoltage lockout prevents erratic startup during brownout conditions. |
Pinout & Package
LT3511MPMS#TRPBF is housed in a 16-lead plastic MSOP package (12-pin footprint, 4 leads removed), with θJA = 90°C/W, optimized for high-voltage isolation and thermal reliability in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable / Undervoltage Lockout Input | Starts or halts switching based on 1.21V threshold; resistor divider enables custom UVLO hysteresis. |
| VIN (Pin 3) | Main Input Supply | Supplies start-up current and serves as DCM comparator reference; requires local bypass capacitor. |
| GND (Pins 5, 8, 9) | Ground Return Paths | Three dedicated ground pins minimize ground bounce and improve noise immunity in high-dV/dt flyback operation. |
| BIAS (Pin 6) | Internal Bias Regulator Output | Provides 3.1V regulated supply for gate driver and internal circuitry; must be bypassed with 4.7μF capacitor. |
| VC (Pin 10) | Error Amplifier Compensation | Connects to RC network for loop stability; 100pF to ground suppresses noise coupling into feedback path. |
| TC (Pin 11) | Temperature Compensation Current Source | Sources proportional-to-absolute-temperature (PTAT) current into RREF to cancel diode VF drift. |
| RREF (Pin 12) | Reference Resistor Connection | Accepts 10kΩ ground-referenced resistor; sets feedback gain with RFB to define output voltage. |
| RFB (Pin 14) | Primary-Side Feedback Input | Connects to transformer primary (SW node); samples reflected flyback pulse amplitude for regulation. |
| SW (Pin 16) | Switch Collector Node | Drives internal 150V power transistor; high dV/dt demands minimized trace area and careful layout. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation without opto-isolator or third winding | Reduces BOM count by ≥3 components and eliminates opto aging/nonlinearity issues in long-life systems. |
| Boundary-mode operation with zero-current detection | Enables consistent output voltage sampling at secondary current zero-crossing, eliminating ESR-induced load regulation error. |
| Integrated 150V/240mA power switch in MSOP | Eliminates external high-voltage MOSFET and associated gate drive complexity in <2.5W isolated designs. |
| –55°C to +150°C operating junction temperature range | Validated for extreme-environment use in avionics, oilfield electronics, and space-qualified subsystems. |
| TC pin with PTAT current source for VF compensation | Enables <±1% output voltage drift over full temperature range without external compensation circuitry. |
Applications
| Isolated Telecom Power Supplies | Isolated Auxiliary/Housekeeping Power Supplies |
|---|---|
Use Scenario: Providing 5V/0.3A isolated bias for control logic and interface ICs in 48V telecom rectifiers and remote radio units. IC Role / Device Role / Timing Role: Primary-side flyback controller managing regulation, startup sequencing, and UVLO protection. Use Value: Eliminates optocoupler and TL431, reducing solution size by 35% and improving long-term reliability in 20+ year deployments. |
Use Scenario: Generating 3.3V/0.2A isolated supply for microcontroller reset circuitry and isolated CAN transceivers in industrial PLC backplanes. IC Role / Device Role / Timing Role: Self-contained isolated DC/DC converter delivering stable low-noise rail independent of main system bus. Use Value: Enables single-transformer solution with <1% load regulation across –40°C to +85°C ambient, meeting IEC 61000-4-5 surge immunity requirements. |
| Isolated Industrial Power Supplies | Isolated Medical Power Supplies |
Use Scenario: Delivering 12V/0.12A isolated power to analog sensor front-ends and isolated ADC drivers in factory automation sensors. IC Role / Device Role / Timing Role: Boundary-mode flyback controller ensuring precise output tracking under varying load transients. Use Value: Achieves <±1.5% total output error over line, load, and temperature-critical for 16-bit measurement accuracy. |
Use Scenario: Supplying 5V/0.1A isolated power to patient-connected monitoring circuits in portable ECG and EEG devices. IC Role / Device Role / Timing Role: Safety-certified isolated power controller supporting reinforced insulation per IEC 60601-1. Use Value: Meets creepage/clearance requirements with standard off-the-shelf transformers (e.g., Würth 750311558) and eliminates opto failure modes. |
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 600mA/200V switch, supports up to 10W; requires external MOSFET; no integrated BIAS regulator. | Targeted at higher-power isolated supplies (>3W); lacks MP-grade temp range; needs external bias supply. | Select when >2.5W output or >100V input is required; not drop-in-requires redesign of bias and gate drive. |
| UCC28911DR | Texas Instruments flyback controller with 700V integrated MOSFET; fixed-frequency quasi-resonant mode; no TC pin. | Optimized for universal AC input (85–265VAC); lacks primary-side temperature compensation; lower integration density. | Prefer for AC/DC adapter designs; unsuitable for precision DC-input isolated supplies requiring <±1% regulation over temperature. |
Compared with LT3511MPMS#TRPBF, LT3748IMS#TRPBF offers higher power capability but sacrifices MP-grade reliability and integrated bias, while UCC28911DR targets AC input and lacks the temperature-compensated feedback critical for DC-input medical/industrial applications.
Availability
LT3511MPMS#TRPBF is available at Aetrix Electronics and suitable for isolated telecom power supplies, industrial auxiliary/housekeeping rails, and medical sensor biasing requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LT3511MPMS#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.
The LT3511MPMS#TRPBF belongs to Linear's high-voltage isolated power controller family, engineered specifically for rugged, opto-free, primary-side regulated flyback converters in harsh-environment applications.
FAQ
What is the maximum output power achievable with LT3511MPMS#TRPBF?
The LT3511MPMS#TRPBF delivers up to 2.5W of isolated output power, validated across input voltages from 4.5V to 100V and output voltages including 3.3V, 5V, 12V, and 24V. Actual output depends on transformer turns ratio, leakage inductance, and input voltage-e.g., a 4:1 Würth 750311558 transformer yields ~1.6W at 72V input and ~1W at 36V input for 5V/0.3A output. The LT3511MPMS#TRPBF's 150V SW pin rating and boundary-mode control enable this performance without external high-voltage switches.
Does LT3511MPMS#TRPBF require an opto-isolator or third winding for regulation?
No, the LT3511MPMS#TRPBF performs primary-side regulation by directly sampling the reflected flyback voltage at the SW pin using the RFB/RREF resistor divider and internal 1.20V bandgap reference. This eliminates both opto-isolators and third-winding feedback networks-reducing component count, cost, and long-term reliability risks from opto aging or winding tolerance drift. The LT3511MPMS#TRPBF achieves <±1% output regulation over line, load, and temperature without them.
What is the purpose of the TC pin on LT3511MPMS#TRPBF?
The TC (Temperature Compensation) pin on LT3511MPMS#TRPBF sources a proportional-to-absolute-temperature (PTAT) current into the RREF node to counteract the negative temperature coefficient of the output rectifier diode's forward voltage (VF). By connecting a resistor from TC to ground, designers set compensation current (ITC = 0.55V/RTC) that offsets VF drift, enabling <±1% output voltage stability over –55°C to +150°C. This feature is unique to the LT3511MPMS#TRPBF among monolithic flyback controllers in its class.
Can LT3511MPMS#TRPBF operate with input voltages below 4.5V?
No-the absolute minimum input voltage for LT3511MPMS#TRPBF is 4.5V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below this, the internal bias regulator cannot sustain proper operation of the gate driver and control circuitry. For sub-4.5V inputs, alternative controllers such as the LT3999 (designed for 2.8V–40V) would be required. The LT3511MPMS#TRPBF's 4.5V–100V range is optimized for industrial, telecom, and automotive auxiliary rails-not low-voltage battery systems.
What transformer parameters are critical for stable operation of LT3511MPMS#TRPBF?
Four transformer parameters are critical: (1) Turns ratio (NPS) must satisfy N < (150V – VIN(MAX) – VLEAKAGE)/(VOUT + VF) to avoid SW pin overvoltage; (2) Primary inductance ≥300μH (e.g., Würth 750311558 at 300μH) ensures ≥400ns off-time for accurate flyback sampling; (3) Leakage inductance ≤5μH minimizes clamping losses; (4) Saturation current ≥500mA prevents core saturation under peak load. Pre-validated parts like Würth 750311558 or Sumida 10396-T024 meet all four for 48V→5V/0.3A designs.
LT3511MPMS#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP
LT3511MPMS#TRPBF FAQ
1.How can I place an order for LT3511MPMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3511MPMS#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 LT3511MPMS#TRPBF reliable?
The price and inventory of LT3511MPMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3511MPMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3511MPMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3511MPMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3511MPMS#TRPBF?
LT3511MPMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3511MPMS#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 LT3511MPMS#TRPBF?
For technical support, including LT3511MPMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3511MPMS#TRPBF requirements.
6.How does Aetrix verify that LT3511MPMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3511MPMS#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 LT3511MPMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3511MPMS#TRPBF?
All LT3511MPMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3511MPMS#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 LT3511MPMS#TRPBF part is unused and in its original packaging.
Return procedure for LT3511MPMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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