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Analog Devices Inc. LT3782AEUFD#PBF
- Part No.:
- LT3782AEUFD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3782AEUFD#PBF.pdf
- Description:
- IC REG CTRLR BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,980
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Product details
Overview
LT3782AEUFD#PBF from Analog Devices (formerly Linear Technology) is a current-mode, 2-phase step-up DC/DC controller IC designed for high-efficiency interleaved boost conversion. It operates from 6V to 40V input, delivers up to 50V/4A output, supports programmable switching frequency from 150kHz to 500kHz, features dual 10V/4A peak gate drivers, and targets industrial power supplies requiring reduced input/output capacitance and thermal management.
For engineers reviewing the LT3782AEUFD#PBF datasheet, LT3782AEUFD#PBF pinout, LT3782AEUFD#PBF application, or LT3782AEUFD#PBF equivalent, key selection criteria include its 2-phase interleaved architecture, programmable duty cycle clamp (50%–94%), tight current sense mismatch (±10mV), synchronous gate signal delay control, and thermally enhanced 4mm × 5mm QFN-28 package with exposed GND pad.
Technical Context
The LT3782AEUFD#PBF implements a constant-frequency, current-mode PWM control architecture with two independent 180° out-of-phase channels. Its transconductance error amplifier regulates output voltage via FB pin feedback against a precise 2.44V reference, while dual current-sense amplifiers monitor SENSE1+/– and SENSE2+/– with 63mV threshold and ±10mV mismatch tolerance.
It integrates dual high-current gate drivers (BGATE1/BGATE2) delivering 4A peak source/sink into >50µF loads, programmable slope compensation via SLOPE pin, soft-start via SS pin (10µA charging current), and configurable maximum duty cycle (50%, 75%, or ≥90%) using DCL pin voltage levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 40V - supports wide industrial input rails including 12V, 24V, and 36V systems without external regulation. |
| Output Capability | 50V, 4A - enables high-voltage boost applications such as telecom power, LED drivers, and isolated supply front-ends. |
| Switching Frequency | 150kHz to 500kHz (RSET-programmable) - higher frequencies reduce passive size; 2-phase operation halves effective ripple frequency. |
| Gate Drive Strength | 10V output, 4A peak source/sink - directly drives high-power N-channel MOSFETs like Si7852DP without external buffers in many cases. |
| Current Sense Threshold | 63mV per channel, ±10mV mismatch - ensures balanced phase current sharing and accurate overcurrent protection in interleaved designs. |
| Reference Voltage | 2.44V ±2.4mV (–40°C to 125°C) - provides stable output voltage programming with <0.1% drift over temperature. |
| Max Junction Temp | 125°C with θJA = 37°C/W (QFN) - requires exposed pad soldered to PCB ground plane for thermal compliance. |
Pinout & Package
LT3782AEUFD#PBF is housed in a thermally enhanced 28-lead (4mm × 5mm) plastic QFN package with exposed GND pad (Pin 29). The package requires soldering of the exposed pad to the PCB ground plane for rated thermal performance and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGATE1 / SGATE2 (Pins 1, 2 / 26, 27) | Synchronous top-FET drive outputs | Provide PWM signals to external drivers for synchronous rectification; require external buffer for high-side FET gate drive. |
| BGATE1 / BGATE2 (Pins 22, 23 / 17, 20) | Bottom-FET gate drivers | 10V, 4A peak drivers for N-channel MOSFETs; each has dedicated VEE1/VEE2 ground return paths for noise immunity. |
| SENSE1+/– / SENSE2+/– (Pins 4,5 / 10,8) | Dual current sense inputs | Accept Kelvin-connected sense resistors; 63mV threshold enables precise per-phase current limiting and balancing. |
| RSET (Pin 7) | Oscillator frequency set | Resistor to GND sets switching frequency (e.g., 80kΩ → 250kHz); also used as reference for DCL and DELAY programming. |
| DELAY (Pin 2) | Programmable BGATE turn-on delay | Adjusts timing between SGATE turn-off and BGATE turn-on (100–500ns) to prevent cross-conduction in synchronous configurations. |
| DCL (Pin 3) | Duty cycle limit control | Voltage level selects max duty cycle: GND = 50%, 1.2V = 75%, VRSET ≈ 2.3V = ≥90% - critical for stability at high VIN/VOUT ratios. |
| FB (Pin 13) | Feedback input | Connects to resistor divider from VOUT; gm amplifier compares to 2.44V reference to regulate output voltage. |
| GND / Exposed Pad (Pins 28, 29) | Signal and thermal ground | Primary ground return; exposed pad must be soldered to PCB ground plane for thermal dissipation and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| 2-phase interleaved operation | Reduces input/output RMS ripple current by up to 70% vs single-phase, enabling smaller capacitors and lower EMI. |
| Programmable slope compensation | External resistor on SLOPE pin increases internal ramp to suppress subharmonic oscillation in high-duty-cycle or high-noise environments. |
| Programmable undervoltage lockout | RUN pin threshold (2.44V typ) with 80mV hysteresis allows custom VIN start-up and brownout protection using simple resistor divider. |
| Synchronous gate signal delay | DELAY pin enables precise timing control between SGATE and BGATE edges to eliminate shoot-through in external synchronous rectifier designs. |
| Tighter current sense mismatch | ±10mV max mismatch between channels (vs ±25mV in LT3782) improves current balance and thermal distribution in parallel phases. |
Applications
| Industrial Power Supplies | Telecom Infrastructure |
|---|---|
|
Use Scenario: 48V intermediate bus generation from 24V or 36V battery or rectified AC input in factory automation PLCs and motor drives. IC Role / Device Role / Timing Role: 2-phase boost controller managing interleaved power stages to minimize input capacitor stress and improve transient response. Use Value: Enables compact 50V/4A output with <10mV current imbalance between phases, reducing thermal derating and extending system lifetime. |
Use Scenario: High-efficiency 54V PoE++ power sourcing equipment (PSE) or base station RF power amplifier bias supplies. IC Role / Device Role / Timing Role: Primary DC/DC controller regulating boosted rail with tight output voltage accuracy (±0.5%) and fast load-step recovery. Use Value: Delivers 93% efficiency at full load (VIN=24V, VOUT=50V) with 2-phase ripple cancellation, lowering output capacitor count by 50%. |
| Interleaved Isolated Power Supplies | High-Voltage LED Drivers |
|
Use Scenario: Front-end boost stage feeding a transformer-isolated forward or LLC converter in medical or test equipment power systems. IC Role / Device Role / Timing Role: Interleaved controller providing low-ripple, high-current input to isolation stage, improving overall system efficiency and EMI profile. Use Value: Reduces input filter inductance requirement by 2× and input capacitor RMS current by 65%, simplifying magnetics design. |
Use Scenario: Constant-current driver for high-brightness LED arrays requiring >40V string voltage in architectural or horticultural lighting. IC Role / Device Role / Timing Role: Precision-controlled boost regulator maintaining stable output under wide dimming range and temperature variation. Use Value: Maintains ±1% LED current regulation via 2.44V reference and low-drift current sense, ensuring consistent lumen output across operating conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-phase boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3782EFE#PBF | TSSOP-28 package (θJA = 30°C/W), same electrical specs but higher thermal resistance and larger footprint. | Better suited for prototyping or space-tolerant layouts where QFN rework is challenging; less optimal for high-density or thermally constrained boards. | Select when board assembly process favors TSSOP or thermal margin exceeds 10°C above LT3782AEUFD#PBF's QFN capability. |
| MPQ4332GJ-A | Single-phase, integrated 6A MOSFETs, fixed 500kHz frequency, no DCL or DELAY pins, lower VIN min (3.3V). | Targets simpler, lower-power (<20W) boost applications; lacks interleaving, programmable duty clamp, and synchronous delay control. | Choose only for cost-sensitive, low-complexity designs where 2-phase benefits (capacitor reduction, thermal spreading) are unnecessary. |
Compared with LT3782EFE#PBF, the LT3782AEUFD#PBF offers superior thermal performance and board area savings; versus MPQ4332GJ-A, it provides essential 2-phase control, precision current matching, and flexible timing configuration required for high-reliability industrial power.
Availability
LT3782AEUFD#PBF is available at Aetrix Electronics and suitable for industrial power supplies, telecom infrastructure, and high-voltage LED drivers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT3782AEUFD#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 LT® portfolio.
The LT3782A product line delivers high-performance, multi-phase DC/DC controllers targeting demanding industrial, telecom, and medical power applications where efficiency, thermal management, and reliability are critical.
FAQ
What is the maximum allowable input voltage for the LT3782AEUFD#PBF?
The LT3782AEUFD#PBF supports an absolute maximum VCC supply voltage of 40V, with recommended operating range from 6V to 36V per typical application schematics. Operation at 40V is permitted only under transient conditions and requires careful thermal design due to increased power dissipation in internal regulators and gate drivers.
How does the LT3782AEUFD#PBF achieve current balance between its two phases?
The LT3782AEUFD#PBF achieves current balance through matched current-sense amplifier offsets (±10mV max mismatch) and identical gain paths for both SENSE1 and SENSE2 channels. This tight matching, combined with 180° interleaved switching, ensures balanced conduction and thermal loading across both power stages without external calibration.
Can the LT3782AEUFD#PBF drive synchronous rectifiers without external gate drivers?
No - the LT3782AEUFD#PBF provides SGATE1/SGATE2 signals for top-FET synchronous drive but requires external gate drivers (e.g., LTC7001) to interface with high-side N-channel MOSFETs. Its BGATE1/BGATE2 outputs can directly drive bottom-FET gates, but SGATE outputs are logic-level and lack sufficient current/voltage for direct FET drive.
What is the purpose of the DELAY pin on the LT3782AEUFD#PBF?
The DELAY pin on the LT3782AEUFD#PBF programs the time interval between SGATE turn-off and BGATE turn-on to prevent cross-conduction in synchronous boost configurations. With DELAY tied to RSET, default delay is ~100ns; adjusting DELAY voltage (0.25V–1V) scales delay linearly to 250–500ns for compensation of external driver propagation delays.
Is the exposed thermal pad on the LT3782AEUFD#PBF electrically connected to GND?
Yes - the exposed pad (Pin 29) of the LT3782AEUFD#PBF is internally connected to GND and must be soldered to the PCB ground plane. This connection serves dual purposes: providing low-thermal-resistance heat dissipation (θJA = 37°C/W) and establishing a low-inductance, low-noise ground return path for high-frequency switching currents.
LT3782AEUFD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Number of Outputs:
- 2
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 6V ~ 40V
- Frequency - Switching:
- 154kHz ~ 465kHz
- Duty Cycle (Max):
- 94%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Reset, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x5)
LT3782AEUFD#PBF FAQ
1.How can I place an order for LT3782AEUFD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3782AEUFD#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 LT3782AEUFD#PBF reliable?
The price and inventory of LT3782AEUFD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3782AEUFD#PBF is usually 5 days.
3.What payment methods are accepted for LT3782AEUFD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3782AEUFD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3782AEUFD#PBF?
LT3782AEUFD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3782AEUFD#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 LT3782AEUFD#PBF?
For technical support, including LT3782AEUFD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3782AEUFD#PBF requirements.
6.How does Aetrix verify that LT3782AEUFD#PBF is sourced from the original manufacturer or authorized distributors?
All LT3782AEUFD#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 LT3782AEUFD#PBF meets industry standards.
7.What is the process for return or replacement of LT3782AEUFD#PBF?
All LT3782AEUFD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3782AEUFD#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 LT3782AEUFD#PBF part is unused and in its original packaging.
Return procedure for LT3782AEUFD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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