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Analog Devices Inc. LT3512MPMS#TRPBF
- Part No.:
- LT3512MPMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads
- Datasheet:
-
LT3512MPMS#TRPBF.pdf
- Description:
- IC REG FLYBACK 420MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,473
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Product details
Overview
LT3512MPMS#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 LT3512MPMS#TRPBF datasheet, LT3512MPMS#TRPBF pinout, LT3512MPMS#TRPBF application, or LT3512MPMS#TRPBF equivalent, key selection criteria include its –55°C to 150°C extended temperature grade, 16-lead MSOP package with four leads removed, primary-side feedback accuracy, and absence of external startup resistor requirement.
Technical Context
The LT3512MPMS#TRPBF implements boundary-mode current-mode 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 this sampled signal against a 1.17–1.23V RREF reference, while TC pin enables diode-forward-voltage temperature compensation via proportional current sourcing.
It integrates high-voltage circuitry rated to 150V on SW and 100V on VIN/EN/UVLO/RFB, with BIAS pin internally regulated to 3.0–3.2V and capable of self-biasing down to 4.5V input. The device features programmable UVLO hysteresis (1.15–1.27V threshold), 40–650kHz variable switching frequency, and internal current limit ranging 80–800mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 100V - supports wide-range industrial, telecom, and automotive input buses without external pre-regulation. |
| Integrated Power Switch | 420mA, 150V NPN transistor - eliminates external high-voltage switch and associated gate drive complexity. |
| Operating Temperature | –55°C to +150°C junction - qualified for harsh-environment military, aerospace, and downhole industrial applications. |
| Switching Frequency Range | 40kHz to 650kHz - variable boundary-mode operation enables high efficiency across load range without subharmonic instability. |
| RREF Reference Voltage | 1.17V to 1.23V (typ. 1.20V) - precision bandgap reference enabling accurate output voltage setting via RFB/RREF ratio. |
| EN/UVLO Threshold | 1.15V to 1.27V rising edge - allows precise undervoltage lockout programming with resistor divider; 2.6µA hysteresis current enables clean startup/shutdown. |
| Quiescent Current | 3.5mA (typ.) - low no-load consumption critical for always-on auxiliary power rails in energy-sensitive systems. |
Pinout & Package
LT3512MPMS#TRPBF is housed in a 16-lead plastic MSOP package with four leads removed (12-pin functional layout), optimized for high-voltage isolation and thermal performance (θJA = 90°C/W). The exposed pad is not electrically connected and must be thermally anchored to PCB ground plane.
| 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 with hysteresis. |
| VIN (3) | Main Input Supply | Powers internal startup circuitry and serves as reference for DCM comparator; requires local ceramic bypass capacitor. |
| GND (5, 8, 9) | Ground Terminals | Three dedicated ground pins minimize ground loop impedance and improve noise immunity in high-dv/dt flyback operation. |
| BIAS (6) | Internal Bias Supply | Provides regulated 3.1V supply for switch driver and logic; can be tied to VIN if <20V, eliminating external bias winding. |
| VC (10) | Error Amplifier Compensation | Connects external RC network to set loop stability; 100pF to ground suppresses high-frequency noise coupling. |
| TC (11) | Temperature Compensation Input | Sources proportional-to-absolute-temperature (PTAT) current into RREF to cancel diode VF drift over temperature. |
| RREF (12) | Reference Resistor Connection | Accepts 10kΩ ground-referenced resistor; sets feedback gain and enables output voltage programming with RFB. |
| RFB (14) | Primary-Side Feedback Input | Connects to transformer primary (SW node); voltage divider with RREF determines output voltage via turns-ratio scaling. |
| SW (16) | Switch Collector Output | Drives transformer primary; 150V rating allows safe operation with 100V reflected flyback + leakage margin. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation | Eliminates optocoupler and third-winding requirements, reducing BOM count, cost, and board area by >30% in isolated designs. |
| Boundary-mode operation | Enables zero-current switching at turn-on, minimizing EMI and improving light-load efficiency versus continuous conduction mode. |
| No external startup resistor | Integrated start-up current path from VIN to BIAS reduces component count and improves reliability in high-input-voltage applications. |
| Extended temperature grade | –55°C to +150°C operation certified per MIL-STD-883 Class H screening-suitable for space-constrained, high-ambient environments. |
| Leakage inductance blanking | Internal timing delay rejects initial SW-node voltage spike, ensuring accurate flyback pulse sampling despite transformer parasitics. |
Applications
| Telecom Auxiliary Power | Industrial Housekeeping Supply |
|---|---|
|
Use Scenario: Providing isolated 5V/0.5A bias rail for optical transceivers and line-card controllers in 48V telecom chassis. IC Role / Device Role / Timing Role: Primary-side regulated flyback controller managing full isolation barrier and output voltage accuracy without optocoupler feedback. Use Value: Enables compact, high-reliability 5V rail using Würth 750311559 transformer (4:1 turns ratio), achieving ±1.5% load regulation across –40°C to +85°C. |
Use Scenario: Generating isolated ±15V rails for analog sensor front-ends and ADC drivers in factory automation PLC modules. IC Role / Device Role / Timing Role: Boundary-mode controller delivering tightly regulated dual outputs using Sumida 10396-T029 transformer (2:1:1 center-tapped). Use Value: Achieves <1% line regulation and <2% load regulation while eliminating optocoupler aging concerns in 15-year industrial deployments. |
| Automotive Body Control Module | Medical Isolated Monitoring |
|
Use Scenario: Supplying isolated 3.3V/0.3A power for CAN transceiver and microcontroller in 12V/24V vehicle body electronics. IC Role / Device Role / Timing Role: High-voltage flyback controller operating from cold-crank (4.5V) to load-dump (100V) conditions with robust UVLO hysteresis. Use Value: Maintains regulation during battery transients; –55°C to +150°C grade ensures functionality in engine bay mounting locations. |
Use Scenario: Powering isolated patient-connected analog front-ends in ECG/EEG monitors requiring reinforced 1500VRMS isolation and low leakage current. IC Role / Device Role / Timing Role: Primary-side sensing controller enabling certified isolation without optocoupler CMTI limitations or LED degradation. Use Value: Meets IEC 60601-1 creepage/clearance requirements using off-the-shelf Würth transformers with 1500V isolation rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3748IMSE#TRPBF | Higher 200V SW rating, no integrated switch, requires external MOSFET; supports higher power (>10W) but adds complexity. | Used where >5W output or >100V input is required; lacks integrated switch and primary-side feedback simplicity. | Select LT3748IMSE#TRPBF only when output power exceeds 4.5W or input voltage exceeds 100V-otherwise LT3512MPMS#TRPBF offers lower BOM count and faster design cycle. |
| UCC28911DR | Texas Instruments part with 700V integrated MOSFET, fixed 100kHz frequency, no TC or RREF pins; simpler but less precise temperature compensation. | Targets cost-sensitive consumer AC/DC adapters; lacks extended temperature grade and fine-grained feedback tuning capability. | Choose UCC28911DR for high-volume, non-military applications below 125°C ambient; LT3512MPMS#TRPBF remains preferred for precision, ruggedness, and design flexibility. |
Compared with LT3748IMSE#TRPBF and UCC28911DR, the LT3512MPMS#TRPBF uniquely combines integrated 150V switch, primary-side regulation, –55°C to +150°C qualification, and programmable temperature compensation-making it optimal for space-constrained, high-reliability isolated auxiliary supplies where BOM minimization and long-term stability are critical.
Availability
LT3512MPMS#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 product lifecycles.
Supply support for LT3512MPMS#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, datasheets, and application engineering for legacy Linear parts including the LT3512 family.
The LT3512MPMS#TRPBF belongs to Linear's high-voltage isolated power controller product line, engineered specifically for primary-side regulated flyback converters in harsh-environment applications demanding extended temperature operation and minimal external components.
FAQ
What is the maximum output power achievable with the LT3512MPMS#TRPBF?
The LT3512MPMS#TRPBF delivers up to 4.5W of isolated output power under optimal conditions-using a properly selected transformer (e.g., Würth 750311559), 48V input, and 5V/0.5A output. Actual power depends on input voltage, transformer turns ratio, and thermal management; at 36V input, typical output drops to ~2.5W due to reduced duty cycle headroom. The 150V SW pin rating and 420mA switch limit constrain maximum deliverable power.
Does the LT3512MPMS#TRPBF require an optocoupler for regulation?
No, the LT3512MPMS#TRPBF does not require an optocoupler. It achieves regulation by directly sensing the reflected flyback voltage at the SW pin during zero-current crossing of the secondary winding-a proprietary primary-side sensing technique that eliminates optocouplers, third windings, and associated aging, linearity, and bandwidth limitations inherent in traditional isolated feedback methods.
How is output voltage set on the LT3512MPMS#TRPBF?
Output voltage on the LT3512MPMS#TRPBF is set using two external resistors: RREF (typically 10kΩ to ground) and RFB (connected between SW and RREF node). The output voltage equals (RFB/RREF) × 1.20V × (1/NPS) – VF, where NPS is the transformer primary-to-secondary turns ratio and VF is the secondary rectifier forward voltage. Temperature compensation via the TC pin further corrects for VF drift.
What is the purpose of the TC pin on the LT3512MPMS#TRPBF?
The TC (Temperature Compensation) pin on the LT3512MPMS#TRPBF sources a proportional-to-absolute-temperature (PTAT) current into the RREF node to offset the negative temperature coefficient of the output rectifier's forward voltage drop. By connecting a resistor from TC to ground, designers inject compensating current that improves output voltage stability over temperature-critical for medical and industrial applications requiring tight regulation across –55°C to +150°C.
Can the LT3512MPMS#TRPBF operate from a 4.5V input supply?
Yes, the LT3512MPMS#TRPBF operates from 4.5V to 100V input. At minimum input, BIAS and VIN are typically shorted to enable internal start-up circuitry; the device draws only 3.5mA quiescent current and maintains regulation using boundary-mode control. This capability makes it suitable for automotive cold-crank scenarios and low-voltage industrial backup systems where input may dip below 5V.
LT3512MPMS#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:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP
LT3512MPMS#TRPBF FAQ
1.How can I place an order for LT3512MPMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3512MPMS#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 LT3512MPMS#TRPBF reliable?
The price and inventory of LT3512MPMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3512MPMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3512MPMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3512MPMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3512MPMS#TRPBF?
LT3512MPMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3512MPMS#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 LT3512MPMS#TRPBF?
For technical support, including LT3512MPMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3512MPMS#TRPBF requirements.
6.How does Aetrix verify that LT3512MPMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3512MPMS#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 LT3512MPMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3512MPMS#TRPBF?
All LT3512MPMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3512MPMS#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 LT3512MPMS#TRPBF part is unused and in its original packaging.
Return procedure for LT3512MPMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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