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Analog Devices Inc. LT3782IFE#PBF
- Part No.:
- LT3782IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT3782IFE#PBF.pdf
- Description:
- IC REG CTRLR BOOST 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,626
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Product details
Overview
LT3782IFE#PBF from Analog Devices (formerly Linear Technology) is a current-mode, two-phase step-up DC/DC controller designed for high-efficiency interleaved boost conversion. It operates at up to 500kHz switching frequency, delivers 10V gate drive with 4A peak current, supports 6V–40V input, and enables 50V/4A output in typical 2-phase configurations for telecom and industrial power supplies.
For engineers reviewing the LT3782IFE#PBF datasheet, LT3782IFE#PBF pinout, LT3782IFE#PBF application, or LT3782IFE#PBF equivalent, key selection considerations include programmable duty cycle clamp (50% or higher), synchronous gate signals with adjustable falling-edge delay, slope compensation for noise immunity, and thermal performance in –40°C to 125°C industrial environments.
Technical Context
The LT3782IFE#PBF implements dual-channel current-mode PWM control with precise 180° phase interleaving, using internal flip-flops to enforce fixed-phase relationship independent of external sync. Its transconductance error amplifier regulates output voltage via FB pin with 2.44V reference, while VC pin serves as the current-loop control node with 0.7V startup threshold.
It integrates dual high-current gate drivers (BGATE1/BGATE2) capable of 10.2–11.7V output and ±4A peak sourcing/sinking into >50μF loads, plus dedicated synchronous drive outputs (SGATE1/SGATE2) with programmable delay relative to BGATE transitions to prevent cross-conduction in external MOSFET driver topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 150kHz to 500kHz, set by RSET resistor; enables compact magnetics and reduced EMI in high-power boost stages. |
| Input Voltage Range | 6V to 40V; supports wide-range industrial and telecom inputs including 12V/24V/36V rails. |
| Gate Drive Capability | 10V output with 4A peak source/sink current; drives high-power N-channel MOSFETs without external buffers in most cases. |
| Current Sense Threshold | 60mV per channel (SENSE1+/–, SENSE2+/–); sets accurate overcurrent protection with Kelvin-sense layout requirement. |
| Duty Cycle Clamp | Programmable via DCL pin: 50%, 75%, or ≥90%; prevents instability in high-VOUT/low-VIN conditions like 12V-to-50V conversion. |
| Operating Temperature | –40°C to 125°C junction; qualified for extended industrial and telecom infrastructure use with thermal shutdown. |
| Slope Compensation | Adjustable via RSLOPE resistor on SLOPE pin; mitigates subharmonic oscillation in high-duty-cycle or high-noise applications. |
Pinout & Package
The LT3782IFE#PBF is housed in a thermally enhanced 28-lead plastic TSSOP package (FE) with exposed pad (Pin 29) fused to GND for optimal heat dissipation. The package is rated for –40°C to 125°C operation and requires soldering of the exposed pad to a PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGATE1 / SGATE2 | Synchronous top-FET drive outputs | Provide PWM signals to external drivers for synchronous rectification; require programmable delay vs BGATE to avoid shoot-through. |
| BGATE1 / BGATE2 | Bottom-FET N-channel gate drivers | Deliver 10V/4A peak drive directly to power MOSFET gates; each has dedicated VEEx ground return path. |
| SENSE1+/– / SENSE2+/– | Per-phase current sense inputs | Accept differential voltage across shunt resistors; 60mV threshold enables precise current limiting with RC filtering. |
| DELAY | Programmable BGATE turn-on delay control | Adjusts timing offset between SGATE turn-off and BGATE turn-on; 100–250ns range avoids cross-conduction in sync designs. |
| DCL | Duty cycle limit programming input | Sets maximum on-time: grounded = 50%, 1.2V = 75%, tied to RSET = ≥90%; critical for stability at high conversion ratios. |
| RSET | Oscillator frequency setting input | Resistor to GND sets charging current and thus switching frequency; 80kΩ yields 250kHz nominal. |
| FB | Voltage feedback input | Connects to resistor divider from VOUT; 2.44V internal reference enables precise output regulation. |
| RUN | Enable/shutdown control | 2.45V threshold with 80mV hysteresis; below 0.3V enters ultra-low-IQ shutdown mode. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved control | Reduces input/output ripple current by ~70% vs single-phase, enabling smaller capacitors and lower EMI in 50V/4A systems. |
| Programmable slope compensation | RSLOPE resistor increases internal ramp slope to suppress noise-induced jitter in high-voltage/high-current boost converters. |
| Synchronous gate signal delay | Configurable 100–250ns delay between SGATE turn-off and BGATE turn-on prevents shoot-through when using external drivers. |
| Thermally enhanced TSSOP | 28-lead FE package with exposed GND pad achieves θJA = 38°C/W, supporting 125°C continuous operation with proper PCB copper area. |
| Wide input voltage range | 6V–40V operation accommodates fluctuating industrial bus voltages and battery-backed telecom inputs without pre-regulation. |
Applications
| Telecom Power Supply | Industrial DC-DC Boost |
|---|---|
Use Scenario: Generating stable 48V or 54V from 24V or 36V intermediate bus in base station RF power amplifiers. IC Role / Device Role / Timing Role: Two-phase boost controller managing interleaved inductor currents and synchronized gate timing to minimize output ripple. Use Value: Enables 50V/4A output with <1% output ripple and >93% efficiency at full load, reducing heatsink size and improving system power density. | Use Scenario: Up-converting 12V battery or PLC supply to 50V for industrial motor drives or solenoid actuation. IC Role / Device Role / Timing Role: High-reliability boost controller with programmable UVLO, soft-start, and thermal shutdown for harsh environments. Use Value: Delivers robust 12V-to-50V conversion across –40°C to 125°C ambient, with duty cycle clamp preventing instability during cold cranking. |
| Interleaved Isolated Supply | High-Voltage Test Equipment |
Use Scenario: Driving push-pull or half-bridge isolated DC-DC stages requiring tightly regulated high-voltage bias rails. IC Role / Device Role / Timing Role: Primary-side controller providing matched phase timing and current balancing for transformer primary drive. Use Value: Achieves <±1.5% current matching between phases, minimizing transformer core imbalance and audible noise in isolation transformers. | Use Scenario: Generating calibrated 50V/4A output for semiconductor parametric test fixtures and precision calibration sources. IC Role / Device Role / Timing Role: Precision-controlled boost stage with low-drift 2.44V reference and stable VC loop for tight output regulation. Use Value: Maintains <0.5% output voltage accuracy over temperature and line, meeting metrology-grade requirements for test equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar two-phase boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3780EFE#PBF | Single-phase architecture; no interleaving; lower max VOUT (36V); integrated MOSFET drivers only (no SGATE outputs). | Suitable for lower-power (<2A), non-interleaved boost where EMI and capacitor size are less critical. | Select LTC3780EFE#PBF only if phase interleaving, 50V capability, or synchronous top-FET control are not required. |
| LT3782AIFE#PBF | Improved phase matching accuracy; tighter duty cycle symmetry; same pinout and electrical specs; recommended for new designs. | Direct drop-in replacement with enhanced stability in high-precision or high-density applications. | Prefer LT3782AIFE#PBF for all new designs-identical footprint and function with superior phase alignment. |
Compared with LT3782IFE#PBF, LTC3780EFE#PBF lacks interleaving and synchronous top-FET support, limiting its use in high-current, low-ripple systems; LT3782AIFE#PBF offers identical functionality with improved phase matching, making it the preferred upgrade path without layout changes.
Availability
LT3782IFE#PBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial equipment, and interleaved isolated power supply designs requiring stable component supply across extended temperature ranges.
Supply support for LT3782IFE#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 and power management product lines with rigorous industrial qualification standards.
The LT3782IFE#PBF belongs to Linear's high-voltage DC/DC controller family, engineered specifically for efficient, high-current, multi-phase boost conversion in demanding industrial and telecom applications.
FAQ
What is the maximum output voltage achievable with the LT3782IFE#PBF in a typical two-phase design?
The LT3782IFE#PBF itself does not impose a hard output voltage limit; instead, practical maximum VOUT depends on external components and layout. In documented typical applications, the LT3782IFE#PBF reliably delivers 50V at 4A using Si7852DP MOSFETs and appropriate magnetics. With careful selection of MOSFETs rated for ≥100V BVDSS and low-ESR output capacitors, designs have achieved stable 60V+ outputs. The controller's 40V VCC rating and gate drive architecture support these high-ratio conversions when powered from an auxiliary rail or bootstrap scheme.
Does the LT3782IFE#PBF support synchronization to an external clock, and what are the timing constraints?
Yes, the LT3782IFE#PBF supports external synchronization via the SYNC pin. The internal oscillator runs at twice the desired switching frequency, so the external sync signal must be at double the target fSW (e.g., 400kHz sync for 200kHz operation). The sync pulse width must exceed 200ns, with a threshold of ~1.2V. The LT3782IFE#PBF accepts sync frequencies from 180kHz to 715kHz depending on RSET value, and includes built-in hysteresis to reject noise. Synchronization ensures deterministic phase alignment across multiple controllers in modular power systems.
How does the DCL pin function on the LT3782IFE#PBF, and what happens when it is left unconnected?
The DCL pin on the LT3782IFE#PBF programs the maximum duty cycle: grounding limits it to 50%, applying 1.2V sets 75%, and tying to RSET enables ≥90%. If left floating, the DCL pin's input current (≤0.3μA) may cause undefined behavior due to noise coupling; Linear's datasheet explicitly states it must be actively driven. Unintended duty cycle clamping can lead to output voltage droop or instability under low-input/high-output conditions. Always connect DCL to a defined voltage or RSET-never leave it open.
Can the LT3782IFE#PBF drive synchronous rectifiers without external gate drivers?
No, the LT3782IFE#PBF cannot directly drive synchronous rectifiers (top-FETs) without external gate drivers. Its SGATE1 and SGATE2 pins provide logic-level PWM signals intended for buffering, not power drive; they deliver only ~100mA peak into 500pF loads. To drive high-side N-channel MOSFETs, external drivers such as the LTC4444 or discrete buffer stages are required. The BGATE1/BGATE2 outputs, however, provide full 4A gate drive for bottom-FETs. This architecture separates control and power paths to optimize timing precision and thermal management.
What thermal design considerations apply to the LT3782IFE#PBF in its 28-lead TSSOP package?
The LT3782IFE#PBF's 28-lead TSSOP (FE) package features an exposed GND pad (Pin 29) that must be soldered to a minimum 200mm² PCB copper area for effective heat transfer. With θJA = 38°C/W, achieving 125°C junction temperature requires ≤2.6W total power dissipation under still-air conditions. Layout best practices include short, wide traces to the exposed pad, multiple thermal vias (≥6×0.3mm) to inner ground planes, and separation from hot components. Thermal performance degrades significantly if the pad is unconnected or undersized-Linear specifies "must be soldered" to ensure rated operation across –40°C to 125°C.
LT3782IFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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, Reset, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
LT3782IFE#PBF FAQ
1.How can I place an order for LT3782IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3782IFE#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 LT3782IFE#PBF reliable?
The price and inventory of LT3782IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3782IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT3782IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3782IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3782IFE#PBF?
LT3782IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3782IFE#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 LT3782IFE#PBF?
For technical support, including LT3782IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3782IFE#PBF requirements.
6.How does Aetrix verify that LT3782IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3782IFE#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 LT3782IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT3782IFE#PBF?
All LT3782IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3782IFE#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 LT3782IFE#PBF part is unused and in its original packaging.
Return procedure for LT3782IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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