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Analog Devices Inc. LT3512MPMS#PBF
- Part No.:
- LT3512MPMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TFSOP (0.118", 3.00mm Width), 12 Leads
- Datasheet:
-
LT3512MPMS#PBF.pdf
- Description:
- IC REG FLYBACK 420MA 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,932
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Product details
Overview
LT3512MPMS#PBF 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 opto-isolators or third-winding feedback-enabling compact telecom auxiliary supplies and industrial housekeeping rails.
For engineers reviewing the LT3512MPMS#PBF datasheet, LT3512MPMS#PBF pinout, LT3512MPMS#PBF application, or LT3512MPMS#PBF equivalent, key selection considerations include its –55°C to 150°C extended temperature rating, primary-side sensing architecture, 40–650kHz variable switching frequency, internal RREF reference (1.17–1.23V), and MSOP-16(12) package with four leads removed.
Technical Context
The LT3512MPMS#PBF implements current-mode boundary conduction mode (BCM) control, where the internal switch turns on precisely when secondary winding current reaches zero-enabling tight regulation without secondary-side feedback components. Its flyback error amplifier samples the reflected output voltage directly from the SW pin during the zero-current interval, referenced to an internal 1.20V bandgap.
Temperature compensation is achieved via TC pin current sourcing into RREF, counteracting diode forward-voltage drift; the device integrates bias regulation (3.0–3.2V at BIAS pin), EN/UVLO with 1.21V threshold and hysteresis, and VC-based loop compensation-all in a single high-voltage MSOP package rated for 150V SW pin transients.
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. |
| Switch Rating | 420mA continuous, 150V max - enables direct high-side switching in flyback topologies up to ~4.5W output with off-the-shelf transformers. |
| Operating Frequency | 40kHz to 650kHz (variable) - BCM operation adapts frequency to load, improving light-load efficiency and eliminating subharmonic oscillation. |
| RREF Voltage | 1.17V to 1.23V (typ 1.20V) - stable internal reference used with RFB/RREF resistor divider to set output voltage independent of transformer turns ratio. |
| Junction Temp Range | –55°C to +150°C - qualified for extended-temperature military, aerospace, and harsh-environment industrial applications. |
| Quiescent Current | 3.5mA (typ) - low startup and no-load consumption enables efficient standby operation in always-on systems. |
| EN/UVLO Threshold | 1.21V ±60mV - precise enable threshold allows accurate input undervoltage lockout using simple resistor divider. |
Pinout & Package
LT3512MPMS#PBF is housed in a 16-lead MSOP package with four leads removed (12-pin functional layout), thermally enhanced for high-voltage isolation and power dissipation. Package outline: 4.0mm × 4.0mm × 1.1mm, θJA = 90°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (1) | Enable / Undervoltage Lockout Input | Starts or shuts down regulator; 1.21V threshold with hysteresis enables programmable UVLO; open-circuit disables operation. |
| 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 minimize impedance and improve noise immunity; all must connect directly to local ground plane. |
| BIAS (6) | Internal Bias Supply | Provides regulated 3.0–3.2V supply for gate driver and core logic; can be tied to VIN if <20V, or driven by third winding. |
| VC (10) | Error Amplifier Compensation | Output of internal transconductance amplifier; RC network to ground sets loop stability and transient response. |
| 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 Terminal | Accepts external ground-referred resistor (typically 10kΩ); sets feedback gain and interacts with TC current for temp-compensated regulation. |
| RFB (14) | Feedback Input | Connects to transformer primary (SW node); voltage divider with RREF determines output voltage via reflected flyback pulse amplitude. |
| SW (16) | Switch Collector Output | Drives external transformer primary; integrates 150V-rated bipolar transistor; requires minimized trace area to reduce EMI and voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Primary-side regulation | Eliminates opto-isolator and third winding-reducing BOM count, cost, and board space while improving long-term reliability and dynamic response. |
| Boundary conduction mode | Enables zero-current switching each cycle, minimizing conduction losses, avoiding subharmonics, and allowing smaller magnetics than CCM designs. |
| Integrated 150V/420mA switch | Reduces external component count and simplifies layout; eliminates need for discrete HV MOSFET and gate driver in low-to-mid power isolated supplies. |
| –55°C to +150°C operation | Qualified for extreme environments including avionics, downhole tools, and military vehicle electronics where standard commercial or industrial grades fail. |
| No external start-up resistor | Internal start-up circuit draws current directly from VIN, enabling immediate operation across full input range without auxiliary bias networks. |
Applications
| Isolated Telecom Auxiliary Supply | Industrial Housekeeping Rail |
|---|---|
Use Scenario: Providing isolated 5V/0.5A bias for control logic, ADC references, and communication interfaces in 48V telecom line cards. IC Role / Device Role / Timing Role: Primary-side flyback controller managing regulation, switching, and thermal protection without secondary feedback components. Use Value: Enables compact, reliable 5V rail generation using Würth 750311559 transformer (4:1) with no opto-isolator-reducing failure modes and qualification effort. | Use Scenario: Generating isolated ±15V rails for op-amp biasing and sensor excitation in programmable logic controllers operating from 24V DC bus. IC Role / Device Role / Timing Role: Boundary-mode controller delivering tightly regulated dual outputs using Sumida 10396-T029 transformer (2:1:1). Use Value: Achieves <±1% load regulation across –40°C to +85°C ambient via TC/RREF temperature compensation-critical for precision analog subsystems. |
| Automotive Body Control Module | Medical Isolated Sensor Interface |
Use Scenario: Powering isolated CAN transceivers and microcontroller peripherals from 12V battery rail in harsh automotive environments with cold-crank capability. IC Role / Device Role / Timing Role: High-voltage flyback controller supporting 4.5V–100V input range and surviving load-dump transients up to 150V on SW pin. Use Value: Delivers robust 3.3V/0.3A output using 1:1 transformer and maintains regulation during 6V cold-crank events-no external LDO or supervisor required. | Use Scenario: Supplying isolated 12V/100mA for patient-connected front-end amplifiers and ADCs in portable diagnostic equipment requiring 1500V AC isolation. IC Role / Device Role / Timing Role: Safety-certified isolated power controller meeting IEC 60601 creepage/clearance requirements via transformer-based galvanic isolation. Use Value: Meets reinforced isolation standards using Würth 750311661 (2:1:0.66) with <100V reflected SW stress-eliminating need for external isolation barriers or safety capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3748EMS#PBF | Higher 600mA/200V switch, supports up to 10W; requires external MOSFET drive; no integrated switch. | Better suited for higher-power isolated supplies (>5W); lacks integrated switch so requires additional gate driver and FET. | Select LT3748EMS#PBF when >5W output or >100V input is needed; LT3512MPMS#PBF remains optimal for ≤4.5W with minimal BOM. |
| UCC28911DR | 700V integrated MOSFET, fixed-frequency DCM, lower quiescent current (1.5mA), no TC pin or primary-side sensing refinement. | Targeted at universal AC input (85–265VAC); less precise primary-side regulation; not rated for –55°C operation. | Choose UCC28911DR for cost-sensitive AC/DC adapters; LT3512MPMS#PBF is preferred for DC-input, high-accuracy, extended-temp isolated DC/DC. |
Compared with LT3748EMS#PBF and UCC28911DR, LT3512MPMS#PBF uniquely combines integrated 150V switch, primary-side sensing with temperature compensation, and –55°C to +150°C qualification-making it the only option for compact, high-reliability, extended-temperature isolated DC/DC in space-constrained industrial and defense systems.
Availability
LT3512MPMS#PBF is available at Aetrix Electronics and suitable for isolated telecom auxiliary supplies, industrial housekeeping rails, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT3512MPMS#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 the LT3512 family.
The LT3512 product line was engineered specifically for high-reliability, transformer-isolated DC/DC conversion in environments where size, temperature, and feedback simplicity are critical-targeting telecom, industrial, and medical auxiliary power applications.
FAQ
What is the maximum output power achievable with LT3512MPMS#PBF?
The LT3512MPMS#PBF delivers up to 4.5W of isolated output power under typical conditions. This assumes proper transformer selection (e.g., Würth 750311559 for 48V→5V), 100V SW pin voltage limit, and 50V margin for leakage spikes. Real-world output depends on input voltage, turns ratio, and efficiency-e.g., 2.5W at 36V input and 3.0W at 72V input using a 4:1 transformer.
Does LT3512MPMS#PBF require an opto-isolator or third winding for regulation?
No, the LT3512MPMS#PBF does not require an opto-isolator or third winding. It achieves regulation by sensing the reflected flyback voltage directly at the SW pin during the zero-current interval of the secondary winding-enabling fully primary-side controlled isolated power conversion.
What is the purpose of the TC pin on LT3512MPMS#PBF?
The TC pin on LT3512MPMS#PBF sources a proportional-to-absolute-temperature (PTAT) current into the RREF node to compensate for the negative temperature coefficient of the output rectifier diode's forward voltage drop-ensuring stable output voltage across the full –55°C to +150°C operating range.
Can LT3512MPMS#PBF operate from a 12V input?
Yes, LT3512MPMS#PBF operates from 4.5V to 100V input, including 12V. At low input voltages, connecting BIAS to VIN enables operation down to 4.5V. For 12V input, use a transformer with appropriate turns ratio (e.g., 1:1 or 2:1) and ensure SW pin voltage remains below 150V during flyback transitions.
What package type and lead finish does LT3512MPMS#PBF use?
LT3512MPMS#PBF uses a 16-lead MSOP package with four leads removed (12-pin functional layout), RoHS-compliant matte tin lead finish, and is marked "3512" on top. The package is specified for –55°C to +150°C junction temperature and features enhanced thermal performance (θJA = 90°C/W).
LT3512MPMS#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:
- 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#PBF FAQ
1.How can I place an order for LT3512MPMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3512MPMS#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 LT3512MPMS#PBF reliable?
The price and inventory of LT3512MPMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3512MPMS#PBF is usually 5 days.
3.What payment methods are accepted for LT3512MPMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3512MPMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3512MPMS#PBF?
LT3512MPMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3512MPMS#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 LT3512MPMS#PBF?
For technical support, including LT3512MPMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3512MPMS#PBF requirements.
6.How does Aetrix verify that LT3512MPMS#PBF is sourced from the original manufacturer or authorized distributors?
All LT3512MPMS#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 LT3512MPMS#PBF meets industry standards.
7.What is the process for return or replacement of LT3512MPMS#PBF?
All LT3512MPMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3512MPMS#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 LT3512MPMS#PBF part is unused and in its original packaging.
Return procedure for LT3512MPMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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