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Analog Devices Inc. LT3782EUFD#TRPBF
- Part No.:
- LT3782EUFD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LT3782EUFD#TRPBF.pdf
- Description:
- IC REG CTRLR BOOST 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,684
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Product details
Overview
LT3782EUFD#TRPBF from Analog Devices (formerly Linear Technology) is a current-mode, two-phase step-up DC/DC controller IC designed for high-efficiency interleaved boost conversion. It operates at up to 500kHz switching frequency, delivers 10V gate drive with 4A peak source/sink capability, supports 6V–40V input range, and targets 50V/4A output applications in telecom infrastructure and industrial power supplies.
For engineers reviewing the LT3782EUFD#TRPBF datasheet, LT3782EUFD#TRPBF pinout, LT3782EUFD#TRPBF application, or LT3782EUFD#TRPBF equivalent, key selection criteria include programmable duty cycle clamp (50% or higher), synchronous gate signal timing control via DELAY pin, slope compensation adjustment, and thermal performance in the 4mm × 5mm QFN package with exposed ground pad.
Technical Context
The LT3782EUFD#TRPBF implements dual-channel current-mode PWM control with precise 180° phase interleaving, using internal flip-flops synchronized to a single oscillator running at twice the output switching frequency. Its transconductance error amplifier (200–370 μmho) regulates output voltage via FB pin feedback against a 2.42–2.488V reference, while independent SENSE1+/– and SENSE2+/– inputs monitor per-phase inductor current with 60mV current limit threshold.
It integrates dual 10V gate drivers (BGATE1/BGATE2) capable of ±4A peak current into capacitive loads >50μF, with programmable falling-edge delay between SGATE and BGATE signals to prevent cross-conduction in synchronous rectifier configurations. The device supports external synchronization (SYNC pin), soft-start (SS pin), undervoltage lockout (RUN pin), and duty cycle limiting (DCL pin) - all configurable via external resistors and capacitors.
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 designs. |
| Input Voltage Range | 6V to 40V; supports wide-range industrial and telecom input rails including 12V, 24V, and 36V systems. |
| Gate Drive Capability | 10V output with ±4A peak current; sufficient to directly drive high-power N-channel MOSFETs without external buffers in many applications. |
| Current Sense Threshold | 60mV across SENSE1+/– and SENSE2+/–; sets accurate per-phase overcurrent protection with Kelvin sensing support. |
| Duty Cycle Clamp | Programmable via DCL pin: 50%, 75%, or ≥90%; prevents transformer saturation and ensures stable operation under low-VIN conditions. |
| Reference Voltage | 2.42V to 2.488V (typ. 2.44V); defines output voltage accuracy when used with FB resistor divider. |
| Operating Temperature | –40°C to +85°C junction; validated for commercial-grade industrial equipment and telecom infrastructure environments. |
Pinout & Package
The LT3782EUFD#TRPBF is housed in a thermally enhanced 28-lead (4mm × 5mm) plastic QFN package with exposed ground pad (Pin 29), requiring soldering to PCB ground plane for optimal thermal performance (θJA = 37°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGATE1 / SGATE2 (Pins 1, 26 / 2, 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 23, 20 / 22, 17) | Bottom-FET gate drivers | Deliver ±4A peak current at 10V to drive N-channel MOSFETs directly; VEE1/VEE2 pins serve as local source return paths. |
| SENSE1+/– / SENSE2+/– (Pins 8,9 / 13,12) | Per-phase current sense inputs | Accept differential voltage across shunt resistors; 60mV threshold enables precise per-phase current limiting and cycle-by-cycle protection. |
| DELAY (Pin 2) | Programmable BGATE turn-on delay control | Adjusts timing offset between SGATE turn-off and BGATE turn-on to eliminate shoot-through in synchronous configurations. |
| RSET (Pin 7) | Oscillator frequency programming | Resistor to GND sets charging current and determines switching frequency; also serves as reference for DCL and DELAY biasing. |
| FB (Pin 13) | Voltage feedback input | Connects to resistor divider from VOUT; error amplifier compares against 2.44V reference to regulate output voltage. |
| RUN (Pin 14) | Enable/shutdown control | 2.45V threshold with 80mV hysteresis; drives device into low-bias shutdown (<0.3V) for system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Two-phase interleaved operation | Reduces input/output ripple current by ~70% vs single-phase, enabling smaller bulk capacitors and lower EMI filter requirements. |
| Programmable slope compensation | RSLOPE resistor on SLOPE pin increases internal ramp slope to suppress subharmonic oscillation in high-duty-cycle or high-noise applications. |
| Synchronous rectifier support | SGATE/DELAY/BGATE timing architecture allows safe implementation of external synchronous FETs, improving efficiency at high output voltages. |
| Thermally optimized QFN package | Exposed pad (Pin 29) fused to internal GND provides low-thermal-resistance path to PCB; mandatory soldering required for rated θJA. |
| Robust gate driver design | Integrated 10V regulator (GBIAS) powers drivers; GBIAS1/GBIAS2 pins allow external 12–14V supply override for high-VIN (>24V) thermal management. |
Applications
| Telecom Power Supply | Industrial DC-DC Boost |
|---|---|
Use Scenario: Interleaved isolated boost stage in 48V telecom rectifier modules delivering 50V/4A to downstream converters. IC Role / Device Role / Timing Role: Two-phase current-mode controller managing parallel boost channels with 180° phase shift to minimize input/output ripple and thermal stress. Use Value: Enables 97% peak efficiency at 12V input and reduces 100μF output capacitor count by 50% versus single-phase implementation. | Use Scenario: High-reliability 24V-to-50V boost converter in factory automation PLC power rails. IC Role / Device Role / Timing Role: Primary controller regulating output voltage via FB loop while enforcing per-phase current limits and thermal-safe gate drive. Use Value: Programmable DCL prevents duty cycle runaway during brown-out; exposed-pad QFN sustains 85°C ambient without derating. |
| Interleaved Isolated Power | High-Voltage Test Equipment |
Use Scenario: Primary-side controller in dual-active-bridge or forward-derived isolated boost for medical imaging power systems. IC Role / Device Role / Timing Role: Generates synchronized, phase-shifted gate signals to primary-side switches; supports external sync for system-level timing alignment. Use Value: DELAY pin programmability eliminates need for discrete timing components; SYNC pin accepts 180–715kHz external clock for deterministic jitter control. | Use Scenario: Precision 36V-to-50V boost stage in portable HV test instruments requiring stable 4A output under variable load. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller with soft-start (SS pin) and RUN-controlled sequencing for safety-critical startup. Use Value: 60mV current sense threshold ensures ±3% current limit accuracy; SS capacitor sets controlled 100ms ramp time to avoid inrush-induced relay chatter. |
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 |
|---|---|---|---|
| LTC3780EUFD#TRPBF | Pin-compatible successor with improved phase matching, lower IQ (11mA vs 16mA), and extended temperature range (–40°C to 125°C). | Supports same 6V–40V input and 50V output, but adds programmable current sharing and enhanced light-load efficiency modes. | Select LTC3780EUFD#TRPBF for new designs requiring tighter phase matching or extended temperature operation; LT3782EUFD#TRPBF remains valid for cost-sensitive legacy replacements. |
| LM5122MMX/NOPB | Single-phase controller with integrated high-side driver; lacks interleaving, phase delay, or dual SENSE inputs. | Requires external circuitry to emulate two-phase operation; no native support for synchronous top-FET timing control. | Use LM5122MMX/NOPB only when interleaving is unnecessary and board space constraints preclude dual-controller layout. |
Compared with LTC3780EUFD#TRPBF, the LT3782EUFD#TRPBF offers identical pinout and basic functionality but lacks phase-matching optimization and extended temperature rating; compared with LM5122MMX/NOPB, it provides true hardware-interleaved control with dedicated per-phase sensing and timing - eliminating software or external logic overhead for balanced current sharing.
Availability
LT3782EUFD#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial DC-DC boost, and interleaved isolated power supply applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT3782EUFD#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, documentation, and manufacturing continuity for the LT® family of power management ICs.
The LT3782EUFD#TRPBF belongs to Linear's high-voltage current-mode controller product line, engineered specifically for efficient, high-power interleaved boost conversion in space-constrained industrial and telecom systems.
FAQ
What is the maximum switching frequency supported by the LT3782EUFD#TRPBF?
The LT3782EUFD#TRPBF supports a programmable switching frequency range of 150kHz to 500kHz, set by the resistor connected from RSET (Pin 7) to GND. At RSET = 40kΩ, the typical frequency is 465kHz; at RSET = 130kΩ, it drops to 154kHz. Operation above 500kHz is not guaranteed and may compromise stability or current limit accuracy.
How does the DELAY pin function in the LT3782EUFD#TRPBF?
The DELAY pin (Pin 2) in the LT3782EUFD#TRPBF controls the timing offset between SGATE turn-off and BGATE turn-on to prevent cross-conduction in synchronous rectifier configurations. When tied to RSET, it provides ~100ns default delay; applying a voltage (e.g., 1V) via resistor divider increases delay to ~150ns, accommodating propagation delays of external gate drivers.
Can the LT3782EUFD#TRPBF drive synchronous MOSFETs directly?
The LT3782EUFD#TRPBF drives bottom-side N-channel MOSFETs directly via BGATE1/BGATE2 (±4A, 10V), but requires external driver buffers for top-side synchronous FETs - signaled through SGATE1/SGATE2 outputs. These are low-current logic-level outputs (20mA sink/source) intended for interfacing with dedicated high-current gate drivers, not direct FET connection.
What is the purpose of the exposed pad (Pin 29) on the LT3782EUFD#TRPBF?
The exposed pad (Pin 29) on the LT3782EUFD#TRPBF is electrically fused to internal GND and serves as the primary thermal conduction path. It must be soldered to a large PCB ground plane to achieve the specified θJA = 37°C/W; omitting this connection degrades thermal performance and risks junction temperature exceedance under full load.
Is the LT3782EUFD#TRPBF pin-compatible with the LT3782A series?
No, the LT3782EUFD#TRPBF is not pin-compatible with the LT3782A series. While both share identical package footprint and pin numbering, the LT3782A introduces internal enhancements to phase matching and noise immunity that require updated layout considerations - particularly around SLOPE and DELAY routing - and is not a drop-in replacement per Linear's design advisories.
LT3782EUFD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-QFN (4x5)
LT3782EUFD#TRPBF FAQ
1.How can I place an order for LT3782EUFD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3782EUFD#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 LT3782EUFD#TRPBF reliable?
The price and inventory of LT3782EUFD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3782EUFD#TRPBF is usually 5 days.
3.What payment methods are accepted for LT3782EUFD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3782EUFD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3782EUFD#TRPBF?
LT3782EUFD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3782EUFD#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 LT3782EUFD#TRPBF?
For technical support, including LT3782EUFD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3782EUFD#TRPBF requirements.
6.How does Aetrix verify that LT3782EUFD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT3782EUFD#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 LT3782EUFD#TRPBF meets industry standards.
7.What is the process for return or replacement of LT3782EUFD#TRPBF?
All LT3782EUFD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3782EUFD#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 LT3782EUFD#TRPBF part is unused and in its original packaging.
Return procedure for LT3782EUFD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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