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Analog Devices Inc. LT3511MPMS#PBF
- Part No.:
- LT3511MPMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads
- Datasheet:
-
LT3511MPMS#PBF.pdf
- Description:
- IC REG FLYBACK 240MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:187
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Product details
Overview
LT3511MPMS#PBF 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#PBF datasheet, LT3511MPMS#PBF pinout, LT3511MPMS#PBF application, or LT3511MPMS#PBF equivalent, key selection considerations include its –55°C to 150°C extended temperature grade, primary-side feedback accuracy, RREF/RFB-based output voltage programming, and SW pin voltage stress limits under leakage conditions.
Technical Context
The LT3511MPMS#PBF implements current-mode boundary conduction mode (BCM) control using a flyback error amplifier that samples the reflected output voltage at the SW pin when secondary current reaches zero. Its internal 1.21V EN/UVLO threshold with 2.6μA hysteresis enables precise undervoltage lockout programming via resistor divider.
It integrates a 150V-rated switch, bias regulator (3.1V BIAS pin), temperature-compensated reference (RREF = 1.17–1.23V), and VC pin for loop compensation. The TC pin sources proportional-to-absolute-temperature (PTAT) current into RREF to offset diode forward-voltage drift across temperature.
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. |
| Switch Rating | 240mA continuous, 150V max - enables direct primary-side switching in low-to-mid power isolated converters. |
| RREF Voltage | 1.17V to 1.23V - precision internal bandgap reference used with RFB/RREF resistors to set output voltage. |
| Operating Temp Range | –55°C to +150°C - qualified for harsh-environment applications including military, downhole, and engine bay electronics. |
| Max Switching Frequency | 650kHz - enables compact magnetics while maintaining boundary-mode stability and EMI control. |
| Quiescent Current | 2.7mA typical - ensures low no-load power draw critical for always-on auxiliary supplies. |
| EN/UVLO Threshold | 1.21V ±60mV - allows accurate, resistor-programmable startup and brownout protection. |
Pinout & Package
LT3511MPMS#PBF is housed in a 16-lead MSOP package with four leads removed (12-pin functional layout), θJA = 90°C/W, rated for –55°C to +150°C junction operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (1) | Enable / Undervoltage Lockout Input | Starts or halts switching based on 1.21V threshold; resistor divider from VIN sets custom UVLO point with hysteresis. |
| VIN (3) | Main Input Supply | Powers internal start-up circuitry and serves as reference for DCM comparator and feedback path. |
| GND (5, 8, 9) | Ground Terminals | Three dedicated ground pins minimize noise coupling and improve thermal dissipation in high-dv/dt flyback operation. |
| BIAS (6) | Internal Bias Regulator Output | Provides 3.1V regulated supply for gate driver and internal logic; requires 4.7μF local bypass capacitor. |
| VC (10) | Error Amplifier Compensation | Connect RC network to ground for loop stability; 100pF to ground suppresses noise on feedback path. |
| TC (11) | Temperature Compensation Input | Sources PTAT current into RREF to cancel diode VF drift - improves output regulation over temperature. |
| RREF (12) | Reference Resistor Connection | Ground-referenced node where external 10kΩ sets reference current; receives TC compensation current. |
| RFB (14) | Feedback Resistor Connection | Connects to SW node via resistor; ratio with RREF determines output voltage via reflected flyback waveform. |
| SW (16) | Switch Collector Terminal | Drives transformer primary; voltage must stay ≤100V pedestal + leakage spike to avoid breakdown of 150V switch. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation | Eliminates opto-isolator and third winding - reduces BOM count, cost, and board area while improving long-term reliability. |
| Boundary conduction mode (BCM) | Enables zero-current switching each cycle - minimizes load regulation error from parasitic resistance and avoids subharmonic oscillation. |
| Integrated 150V/240mA switch | Reduces external component count and layout complexity - supports direct connection to 100V input rails without external FET. |
| Temperature-compensated feedback | TC pin current offsets diode VF drift - maintains ±1% output voltage accuracy over –55°C to +150°C operating range. |
| No external start-up resistor | Internal 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, Ethernet PHY, and management MCU in 48V telecom shelf systems. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller managing isolation barrier and delivering stable auxiliary rail without optocoupler. Use Value: Enables single-transformer solution meeting IEC 60950 creepage/clearance requirements while reducing component count by 30% vs. opto-based designs. | Use Scenario: Generating isolated ±15V rails for analog sensor front-ends and isolated gate drivers in PLC I/O modules operating from 24V DC field bus. IC Role / Device Role / Timing Role: Boundary-mode flyback controller delivering dual-polarity outputs with tight cross-regulation via shared transformer winding. Use Value: Achieves <±3% load regulation across –40°C to +85°C ambient using only two external resistors and off-the-shelf Würth 750311838 transformer. |
| Automotive Body Control Module | Medical Diagnostic Equipment |
Use Scenario: Supplying isolated 3.3V/0.2A for CAN transceiver and microcontroller in under-hood BCMs exposed to 125°C ambient and load dump transients. IC Role / Device Role / Timing Role: High-temp flyback controller with 150V switch rating handling 100V load dump spikes without external clamping beyond DZ clamp. Use Value: Qualified to –55°C to +150°C junction temperature - eliminates derating concerns and enables direct mounting near heat sources. | Use Scenario: Delivering isolated 24V/70mA and ±70V rails for ultrasound transducer bias and ADC reference in portable diagnostic devices requiring 1500V isolation. IC Role / Device Role / Timing Role: Primary-side regulated controller enabling compact, low-EMI isolated supply meeting IEC 60601-1 2×MOPP requirements. Use Value: Uses Würth 750311963 transformer with 1:5 turns ratio - achieves >85% efficiency at full load while maintaining <100mVpp output ripple. |
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#PBF | Higher 200V switch rating; requires external MOSFET; no integrated switch; supports higher power (up to 10W). | Used where >2.5W output or >100V input is required; lacks integrated switch so needs external FET and driver. | Select LT3748IMS#PBF when scaling beyond 2.5W or needing >150V switch capability - but expect added complexity and layout sensitivity. |
| UCC28911DR | Fixed 70kHz frequency; no TC pin; lower 700V switch rating but higher current (400mA); TI's primary-side sensing architecture differs. | Targets cost-sensitive consumer AC/DC adapters; not rated for –55°C or >125°C operation; lacks temperature compensation. | Choose UCC28911DR only for commercial-grade, non-extended-temp applications where lowest BOM cost is priority over precision regulation. |
Compared with LT3511MPMS#PBF, LT3748IMS#PBF offers higher voltage headroom but adds external FET complexity, while UCC28911DR sacrifices temperature stability and extended temperature qualification for lower unit cost - making LT3511MPMS#PBF optimal for ruggedized, precision isolated auxiliary supplies.
Availability
LT3511MPMS#PBF is available at Aetrix Electronics and suitable for telecom auxiliary power, industrial control housekeeping, and automotive body control module applications requiring stable component supply across extended temperature ranges.
Supply support for LT3511MPMS#PBF 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 LT3511MPMS#PBF belongs to Linear's high-voltage isolated power controller family, engineered specifically for primary-side regulated flyback topologies in space-constrained, high-reliability systems where opto-isolator elimination is critical.
FAQ
What is the maximum allowable SW pin voltage for LT3511MPMS#PBF during flyback operation?
The LT3511MPMS#PBF SW pin is rated for 150V transients, but operational flyback waveforms must keep the pedestal voltage below 100V to maintain ≥50V safety margin against leakage spikes. Exceeding 100V pedestal risks premature switch failure, especially under high-load or poor-leakage-inductance conditions. Always verify peak SW voltage with oscilloscope under worst-case line/load/temperature conditions before finalizing transformer turns ratio and clamp design for LT3511MPMS#PBF.
How does the TC pin function in LT3511MPMS#PBF, and what resistor value is recommended?
The TC pin on LT3511MPMS#PBF sources a proportional-to-absolute-temperature (PTAT) current into the RREF node to compensate for negative temperature coefficient of output rectifier diode forward voltage. The current is calculated as ITC = 0.55V / RTC. For a typical 48V-to-5V design using Würth 750311558 transformer (NPS = 4), RTC ≈ 53.6kΩ yields optimal temperature compensation. Experimental verification and fine-tuning of RTC is required per application to achieve <±1% output voltage drift from –55°C to +150°C for LT3511MPMS#PBF.
Can LT3511MPMS#PBF operate without an external transformer third winding?
Yes - LT3511MPMS#PBF is explicitly designed for primary-side regulation and requires no third winding or opto-isolator. It senses output voltage directly from the reflected flyback pulse at the SW pin during zero-secondary-current intervals. This architecture eliminates isolation components, reduces cost and size, and improves long-term reliability versus traditional opto-coupled solutions - a core functional specification confirmed in the LT3511MPMS#PBF datasheet and typical application circuits.
What is the minimum primary inductance required for stable operation of LT3511MPMS#PBF?
LT3511MPMS#PBF requires minimum primary inductance to ensure ≥400ns secondary conduction time for accurate output voltage sampling. For IPEAK(MIN) = 55mA and tOFF(MIN) = 400ns, LPRI ≥ [tOFF(MIN) × NPS × (VOUT + VF)] / IPEAK(MIN). Additionally, tON(MIN) = 100ns constrains LPRI ≥ [tON(MIN) × VIN(MAX)] / IPEAK(MIN). For a 72V max input and 5V/0.3A output with NPS = 4, LPRI ≥ 300μH is recommended - matching Würth 750311558 and Sumida 10396-T024 transformers validated for LT3511MPMS#PBF.
Does LT3511MPMS#PBF support discontinuous conduction mode (DCM) at light loads?
Yes - LT3511MPMS#PBF transitions into discontinuous conduction mode (DCM) below ~0.6V on the VC pin, reducing switching frequency down to 40kHz minimum to maintain regulation at light loads. Unlike fixed-frequency controllers, this adaptive DCM behavior preserves boundary-mode benefits (zero-current switching, no subharmonics) while minimizing no-load quiescent current to 2.7mA. This feature is intrinsic to LT3511MPMS#PBF's control architecture and verified in Typical Performance Characteristics graphs G06 and G11.
LT3511MPMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT3511MPMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3511MPMS#PBF 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#PBF reliable?
The price and inventory of LT3511MPMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3511MPMS#PBF is usually 5 days.
3.What payment methods are accepted for LT3511MPMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3511MPMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3511MPMS#PBF?
LT3511MPMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3511MPMS#PBF 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#PBF?
For technical support, including LT3511MPMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3511MPMS#PBF requirements.
6.How does Aetrix verify that LT3511MPMS#PBF is sourced from the original manufacturer or authorized distributors?
All LT3511MPMS#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT3511MPMS#PBF?
All LT3511MPMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3511MPMS#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT3511MPMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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