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Analog Devices Inc. LT8312MPMS#PBF
- Part No.:
- LT8312MPMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- PFC (Power Factor Correction)
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT8312MPMS#PBF.pdf
- Description:
- IC PFC CTRLR DCM 400KHZ 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,174
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Product details
Overview
LT8312MPMS#PBF from Analog Devices (formerly Linear Technology) is a high-efficiency power factor correction (PFC) boost controller designed for critical conduction mode (CrCM) operation in offline AC/DC front-ends. It delivers >0.99 power factor, <5% THD at 200W, 95% peak efficiency, and operates across –55°C to +150°C junction temperature. It drives external N-channel MOSFETs in universal-input (90–265VAC) PFC stages for industrial and avionics power supplies.
For engineers reviewing the LT8312MPMS#PBF datasheet, LT8312MPMS#PBF pinout, LT8312MPMS#PBF application, or LT8312MPMS#PBF equivalent, key selection criteria include CrCM frequency clamping (400kHz max), 1.9A gate driver strength, 102mV SENSE current limit threshold, EN/UVLO hysteresis (1.25V threshold with 10µA sink), and –55°C to +150°C extended temperature grade.
Technical Context
The LT8312MPMS#PBF implements active PFC via an internal multiplier that modulates the peak current limit proportionally to line voltage sensed at VIN(SENSE), enabling near-unity power factor. Its CrCM control architecture uses DCM pin detection of auxiliary winding ringing to achieve zero-current switching, reducing switching losses.
It integrates a 10V INTVCC LDO (with 500mV dropout), precision 1.25V FB reference (±1.5% over temp), 2V VREF output (200µA drive), and 1.9A gate driver with 18ns rise/fall times. The error amplifier features 180V/V gain and 170µmhos transconductance for stable loop compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Critical conduction mode (CrCM) boost PFC controller - enables zero-current turn-on, minimizing switching loss and EMI. |
| Input Voltage Range | 10V to 38V DC on VIN pin - supports wide-range offline-derived bias rails; internal 40V shunt protects against overvoltage. |
| Power Factor | >0.99 at full load - meets IEC 61000-3-2 Class C/D harmonic limits for lighting and industrial equipment. |
| SENSE Threshold | 102mV typical - sets peak switch current limit; combined with minimum 3mV limit, improves low-line crossover THD. |
| EN/UVLO Threshold | 1.25V rising edge with 10µA hysteresis current - enables precise, micropower start-up sequencing from high-voltage AC lines. |
| Max Oscillator Frequency | 400kHz - prevents excessive switching loss at light loads while maintaining CrCM behavior up to ~200W output. |
| Operating Temperature | –55°C to +150°C - qualified for harsh environments including aerospace, military, and high-reliability industrial systems. |
Pinout & Package
LT8312MPMS#PBF is housed in a 16-lead plastic MSOP package (3.0mm × 4.0mm, 0.5mm pitch) with exposed pad for thermal enhancement. Pin 1 is top-left corner when notch is oriented up; pins numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1,2,3,7,8) | Ground reference | Five dedicated ground pins minimize PCB ground impedance and improve noise immunity in high-dI/dt PFC circuits. |
| VREF (4) | 2V reference output | Stable 2V source for OVP divider; capable of sourcing 200µA without droop - simplifies overvoltage protection design. |
| OVP (5) | Overvoltage protection input | Compares FB voltage to VREF-derived threshold; halts switching if output exceeds setpoint - safeguards downstream converters. |
| VC (6) | Error amplifier output | High-impedance node for loop compensation; requires RC network to ground plus 100pF noise filter for stability. |
| FB (9) | Voltage feedback input | 1.25V precision reference point; senses output via resistor divider - regulates VOUT within ±1.5% over temperature and line. |
| DCM (10) | Discontinuous mode detector | Detects auxiliary winding ringing via dv/dt; triggers switch reactivation at valley - enables zero-current switching and 5% efficiency gain. |
| VIN (11) | Bias supply input | Start-up rail with internal 40V/8mA shunt; powers INTVCC LDO - eliminates need for external bias supply in most designs. |
| EN/UVLO (12) | Enable/undervoltage lockout | Hysteretic enable pin with 1.25V threshold and 10µA current sink - allows robust, self-regulating start-up from rectified AC. |
| INTVCC (13) | Internal regulated supply | 10V ±0.2V LDO output; powers gate driver and logic - requires 4.7µF local ceramic capacitor for transient response. |
| GATE (14) | MOSFET gate driver | 1.9A peak sink/source; drives N-channel FET gates directly - supports fast-switching, low-Qg MOSFETs up to 600V drain rating. |
| SENSE (15) | Current sense input | Measures voltage across external RSENSE; blanking time (130ns typ.) rejects switching noise - ensures accurate peak current control. |
| VIN(SENSE) (16) | Line voltage sense input | Accepts scaled AC line voltage; feeds internal multiplier for PFC - sets instantaneous current limit proportional to line voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Active Power Factor Correction | Enables >0.99 PF and <5% THD by dynamically scaling peak current limit with line voltage - meets Energy Star and IEC 61000-3-2 requirements. |
| Critical Conduction Mode Control | Uses DCM pin to detect auxiliary winding ringing and trigger zero-current turn-on - reduces switching loss and EMI without requiring complex controllers. |
| Extended Temperature Grade | –55°C to +150°C operating range - validated for aerospace, defense, and high-reliability industrial applications where standard commercial parts fail. |
| Integrated 10V LDO & Gate Driver | 10V INTVCC regulator (9.8–10.4V) with 1.9A gate driver - eliminates external bias supply and enables direct drive of high-voltage MOSFETs. |
| Low-Noise Feedback Architecture | 1.25V FB reference with 180V/V error amplifier gain and 170µmhos transconductance - supports stable loop compensation with minimal external components. |
| Robust Start-Up Circuitry | VIN shunt (40V/8mA) + EN/UVLO hysteresis (1.25V, 10µA) - ensures reliable, micropower start-up from universal AC inputs without auxiliary windings. |
Applications
| Industrial Motor Drives | Avionics Power Supplies |
|---|---|
|
Use Scenario: 3-phase motor drive front-end with universal AC input (90–265VAC) and 400V DC bus. IC Role / Device Role / Timing Role: PFC boost controller regulating DC bus voltage while enforcing harmonic compliance per IEC 61000-3-12. Use Value: Achieves >0.99 PF and 95% efficiency at 200W, enabling compact heatsink design and eliminating need for passive harmonic filters. |
Use Scenario: 400Hz aircraft power system (97–134VAC) feeding 28V DC distribution bus with strict EMI and reliability requirements. IC Role / Device Role / Timing Role: CrCM PFC controller providing regulated 400V intermediate bus for downstream DC/DC conversion. Use Value: –55°C to +150°C rating ensures operation during cold-soak and high-altitude thermal cycling; 400kHz max frequency avoids sensitive avionics bands. |
| Energy-Efficient Lighting | Medical Imaging Power Systems |
|
Use Scenario: High-power LED driver with universal input and <0.5W no-load consumption for Energy Star certification. IC Role / Device Role / Timing Role: Primary-side PFC controller delivering stable 400V bus to LLC resonant converter stage. Use Value: Meets Energy Star 8.0 no-load requirement (<0.5W) and harmonic limits without auxiliary bias winding or complex control schemes. |
Use Scenario: CT/MRI scanner power supply requiring ultra-low EMI, high reliability, and operation across wide ambient temperatures. IC Role / Device Role / Timing Role: Front-end PFC controller generating clean, regulated DC bus for high-precision X-ray generator inverters. Use Value: Low THD (<5%) and CrCM operation minimize conducted EMI; extended temperature grade supports operation in unconditioned equipment rooms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PFC boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8312IMS#PBF | Same silicon, rated for –40°C to +125°C - lacks extended low-temp capability and reduced high-temp derating margin. | Suitable for commercial/industrial environments but not aerospace or extreme cold-start scenarios. | Select LT8312MPMS#PBF when operation below –40°C or above 125°C is required; IMS variant offers cost advantage for less demanding thermal profiles. |
| UCC28056DR | Texas Instruments CrCM PFC controller with 65kHz fixed frequency option, lower gate drive (1A), and no integrated VREF output. | Targets cost-sensitive consumer power supplies; lacks extended temperature grade and 2V reference for simplified OVP. | Choose LT8312MPMS#PBF for high-reliability, wide-temperature, or reference-sourced OVP designs; UCC28056DR fits budget-constrained, non-military applications. |
Compared with LT8312IMS#PBF, the LT8312MPMS#PBF adds guaranteed operation down to –55°C and up to +150°C, critical for avionics and defense. Against UCC28056DR, it provides higher gate drive, integrated VREF, and superior thermal robustness - making it preferable for mission-critical PFC stages where reliability outweighs BOM cost.
Availability
LT8312MPMS#PBF is available at Aetrix Electronics and suitable for industrial motor drives, avionics power supplies, energy-efficient lighting, medical imaging systems, and high-reliability embedded power conversion requiring stable component supply across extended temperature ranges.
Supply support for LT8312MPMS#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 its high-performance analog IC portfolio. Linear pioneered precision power management ICs with emphasis on efficiency, accuracy, and ruggedness.
The LT8312MPMS#PBF belongs to Linear's high-voltage PFC controller product line, engineered specifically for CrCM-based offline power supplies requiring ultra-high power factor, low THD, and operation in extreme thermal environments.
FAQ
What is the operating temperature range of the LT8312MPMS#PBF?
The LT8312MPMS#PBF is specified for operation from –55°C to +150°C junction temperature. This extended range is validated per MIL-STD-883 methods and supports deployment in aerospace, defense, and industrial applications where standard commercial-grade parts (e.g., LT8312EMS#PBF, –40°C to +125°C) cannot survive thermal extremes.
How does the LT8312MPMS#PBF achieve power factor correction?
The LT8312MPMS#PBF achieves active PFC by using its VIN(SENSE) pin to sample the rectified AC line voltage and feed it into an internal multiplier. This scales the current limit threshold proportionally to instantaneous line voltage, forcing input current to track voltage waveform - resulting in >0.99 power factor and <5% THD at full load.
What is the purpose of the DCM pin on the LT8312MPMS#PBF?
The DCM pin on the LT8312MPMS#PBF detects discontinuous conduction mode by sensing dv/dt on an auxiliary winding. When the output diode turns off and parasitic ringing begins, the DCM comparator triggers switch reactivation at the voltage valley - enabling zero-current switching and improving efficiency by up to 5% compared to fixed-frequency CrCM.
Can the LT8312MPMS#PBF operate without an auxiliary winding?
No - the LT8312MPMS#PBF requires an auxiliary winding for both steady-state bias (via VIN pin) and DCM detection (via DCM pin). The auxiliary winding replaces the need for an external bias supply and enables valley-switching CrCM operation. Designs omitting it will fail to start or regulate properly.
What is the maximum gate drive capability of the LT8312MPMS#PBF?
The LT8312MPMS#PBF provides a 1.9A peak gate driver (sink and source) on the GATE pin, with 18ns rise/fall times into 3300pF. This enables direct drive of high-voltage N-channel MOSFETs (e.g., 600V devices) without external buffers, supporting fast switching and low gate charge losses in high-efficiency PFC stages.
LT8312MPMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Mode:
- Discontinuous Conduction (DCM)
- Frequency - Switching:
- 400kHz
- Current - Startup:
- 80 µA
- Voltage - Supply:
- 10V ~ 38V
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP
LT8312MPMS#PBF FAQ
1.How can I place an order for LT8312MPMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8312MPMS#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 LT8312MPMS#PBF reliable?
The price and inventory of LT8312MPMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8312MPMS#PBF is usually 5 days.
3.What payment methods are accepted for LT8312MPMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8312MPMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8312MPMS#PBF?
LT8312MPMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8312MPMS#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 LT8312MPMS#PBF?
For technical support, including LT8312MPMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8312MPMS#PBF requirements.
6.How does Aetrix verify that LT8312MPMS#PBF is sourced from the original manufacturer or authorized distributors?
All LT8312MPMS#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 LT8312MPMS#PBF meets industry standards.
7.What is the process for return or replacement of LT8312MPMS#PBF?
All LT8312MPMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8312MPMS#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 LT8312MPMS#PBF part is unused and in its original packaging.
Return procedure for LT8312MPMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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